L&T MOTORSTARTER
HANDBOOK
Electrical Standard Products
Larsen & Toubro Limited
Powai Campus, Mumbai 400 072
Tel: 022-6705 0505
Fax: 022-6705 1746
E-mail: [email protected]
Website: www.LNTEBG.com
Introduction
This handbook attempts to illustrate typical circuit arrangements for DOL, Star-Delta and other combinations of motor starters using L&T contactors, overload relays, timers, push buttons, rotary switches and other accessories.
These circuits can be used as guidelines when planning switchboards or control panels. They can also be utilised for maintenance of standard L&T starters.
Page No.SECTION I
SECTION II Normal connections for 4 Direct-on-line (DOL) starters
SECTION III Normal connections for 19 Star-delta starters
SECTION IV Normal connections for 70 reversing Starters
Normal connections for 75 pole changing Starters
SECTION V Applications 79
SECTION VI Chart of relay ranges 90& back up fuses
SECTION VII Information for Installation & 107Preventive Maintenance
SECTION VIII Trouble shooting chart 111for starters
SECTION IX Capacitor ratings for 115power factor improvement
SECTION X Switchgear Standard Products Range 118 Switchgear Training Centers
* Section IV contains wiring diagrams of the starters which are not manufactured by L&T at present. Wiring diagram of such starters are given for reference purpose.
General 1
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CONTENT
STARTERS FOR AGRICULTURAL AND DOMESTIC USE
FARMER’S CHOICE
INDUSTRIAL STARTERS - TYPE ML
NEW MU/MB DOL AND STAR DELTA STARTERS
(Specially Designed for Agriculture Sector) (for 10hp 30hp motors)
INDUSTRIAL STARTERS- TYPE MN
General
lRelay setting
Tripping of starters
Back up fuses
Coil Voltage
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SECTION I
SECTION I
General
To provide motors with accurate and reliable protection, it is essential to keep the following points in mind :
1) Relay setting The overload relay unit is the protection center of the motor starter. Relays come in a number of ranges. Selection of a relay for a starter depends upon motor hp and duty. A selection table indicating the proper range for different ratings is given in section VI. For all direct-on-line starters, relays should be set to the actual load current of the motor. This value should be equal to or lower than the full load current indicated on the motor name plate. Here is a simple procedure for setting the relay to the actual load current: Set the relay to about 80% of full load current. If it trips, increase the setting to 85% or more. The relay should never be set at more than the actual current drawn by the motor (The actual current drawn by a motor will be less than the full load current in most of the cases, as motors may not be loaded to capacity.) The relay operates on the phase currents in Star-Delta starters. It should, therefore, be set at 0.6 times actual load current. A procedure similar to the one described for setting relays in DOL starters can be followed for Star-Delta starters.
2) Tripping of startersA starter may trip due to the following conditions;a) Low voltage or failure of power supplyb) Persistent overload on the motorIn the first instance, the tripping occurs through the coil which opens the contacts when voltage falls below a certain level. The starter can be restarted as soon as supply is back to normal. The relay trips the starter when there is an overload. It can be restarted only after the relay is reset. However, the cause of overload must be
investigated before restarting, or else the starter will trip again. Persistent overloading can reduce the life of the motor.
2 3
L&T offers manual reset type thermal overload relays. These relays clearly discriminate between tripping caused by an overload and tripping due to failure of supply voltage. MN relays also give protection against single phasing and overload. MN relays are provided with Auto/Manual reset facility.When a starter trips because of an overload, it cannot be restarted by pressing the start button. The stop button has to be pressed first to manually reset the relay before restarted. The relays can be reset only after the bimetals have cooled sufficiently. Resetting must therefore be carried out after one or two minutes. This will also permit the motor to cool down.
Back-up fuses Motor starters must never be used without back-up fuses. The sensitive thermal relay mechanism is designed and calibrated to provide effective protection against overload fuses preferably the HRC cartridge type, are essential for protecting the installation as well as the thermal overload relay of motor starter against short circuits. A reference table indicating fuse ratings for different ratings is given in Section VI.
It is recommended that the use of semi-enclosed, rewirable tinned copper fuses may be avoided.
Coil voltageSelection of coils depends on the actual supply voltage
available. A wide variety of coil voltages like 24V, 42V, 110V, 220V, 230 / 250V, 360V, 400 / 440V ac are available as standard for L&T contactors and starters.
MK1 DIRECT - ON - LINE STARTER
4 5
SECTION II
Normal connections for Direct-On-Line (DOL) starters
Starter type MK1
Starter type MU1 / MU2
Starter type MB1 / MB2
Starter type ML 0 / 1 / 1.5 / 2 / 3 / 4 / 6
Starter type ML 10 / 12 with MN 12L relay
Starter type MN 16 / 25 / 32 / 45 / 65
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START
BLUE
YELLOW
RED
STOPRESET
R Y B
R Y B
P1 P2 P3 P4
A B C
K
5
A B C
MOTOR
MK1 DOL
Note: The Stop contact between the terminals P1 - P2 willalways be connected in series with the magnet coil to ensure that the motor starter will trip in case of overload.
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 1 / LI - A1 &
connect A1 to neutral.3. For external pilot supply disconnect wires 1 / L1 - A1 &
13 - 5 / L3 and connect external pilot supply to A1 & 94.
6 7
MB1 / MB2 & MU1 / MU2 DOL STARTERKEY DIAGRAM - MK1 DOL
STOP / RESET
B
K P4
START
P35
P2
P1
R
STARTO / R
A1
A B C
MOTOR
R Y B
1 / L1 3 / L2 5 / L3 13
146 / T34 / T22 / T1
A2
OFF / RESET
95
97
989694
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
8 9
ML0 / 1 / 1.5 / 2 / 3 / 4 / 6 DOL STARTERKEY DIAGRAM - MB1 / MB2 & MU1 / MU2 DOL STARTER
B (5 / L3)
13
14
94
96
95
A2
A1
R (1 / L1)
POWER TERMINAL MARKING
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
ML1 DOL
R Y B
1 / L1 3 / L2 5 / L3STOP / RESET START
96 95 93 94
1 / L13 / L2
5 / L311
12 24
23 31
32
43
44
2 / T1 4 / T2 6 / T3
A1 A2
M
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10 11
KEY DIAGRAMML0 / 1 / 1.5 / 2 / 3 / 4 / 6 DOL STARTER
ML10 / 12 DOL STARTER(WITH MN12L RELAY)
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 1 / L1 - A2 &
connect A2-neutral.3. For external pilot supply disconnect wires 1 / L1 - A2 &
94 - 5 / L3 and connect external pilot supply to A2 & 94.
B (5 / L3)
44
43
94
93
95
96
START
STOP / RESET
A1
A2
R (1 / L3)
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
MOTORPOWER TERMINAL MARKING
R Y B
OFF / RESET
O / RSTART
95
97
-
94 96
98
A1
A2
1
2
3
4
12 13
KEY DIAGRAM(WITH MN12L RELAY)
MN16 DOL STARTER
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 1 / L1 - A1 &
connect A1 to neutral.3. For external pilot supply disconnect wires 1 / L1 - A1 &
13 - 5 / L3 and connect external pilot supply to A1 & 94.
MOTOR
R Y B
1 / L1 3 / L2 5 / L3
A1 A2
2 / T1 4 / T2 6 / T3
13
14
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
OFF / RESET
95START
94 96
97
98
A B C
O / R
B (5 / L3)
95
STOP / RESET
96
3
H / NO
494
START
A1
A2
R (1 / L1)
MN 16 DOL
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KEY DIAGRAMMN16 DOL STARTER
MN25 / 32 DOL STARTER
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 1 / L1 - A1 &
connect A1 to neutral.3. For external pilot supply disconnect wires 1 / L1 - A1 &
13 - 5 / L3 and connect external pilot supply to A1 & 94.
R Y B
MOTOR
A B C
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
A1 A2
13
14
OFF / RESET
95START
94 96
97
98
O / R
B (5 / L3)
13
94
14
96
95
A2
A1
R (1 / L1)
MN 25 , 32 DOL
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KEY DIAGRAMMN25 / 32 DOL STARTER
MN45 / 65 DOL STARTER
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 1 / L1 - A1 &
connect A1 to neutral.3. For external pilot supply disconnect wires 1 / L1 - A1 &
13 - 5 / L3 and connect external pilot supply to A1 & 94.
MOTOR
A B C
R Y B
1 / L1 3 / L2 5 / L3
A1 A2
2 / T1 4 / T2 6 / T3
13
14
1 / L1 3 / L2 5 / L3
2 / T1
OFF / RESET
95START
94 96
97
98
O / R
21
22
31
32
43
44
4 / T2 6 / T3
B (5 / L3)
9413
14
96
95
A2
A1
R (1 / L1)
MN 45 , 65 DOL
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KEY DIAGRAMMN45 / 65 DOL STARTER
SECTION III
Normal Connection for Star - Delta
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lStarter type MK1 — Fully-automatic (FASD)
lStarter type MU1 / MU2 — Semi-automatic (SASD)
lStarter type MU1 / MU2 — Fully-automatic (FASD)
lStarter type MB1 / MB2 — Semi-automatic (SASD)
lStarter type MB1 / MB2 — Fully-automatic (FASD)
lStarter type ML 1.5 / 2 — Semi-automatic (SASD)
lStarter type ML 1 / 1.5 — Fully-automatic (FASD)
lStarter type ML2 — Fully-automatic (FASD)
lStarter type ML3 — Semi-automatic (SASD)
lStarter type ML3 — Fully-automatic (FASD)
lStarter type ML 4 / 6 — Fully-automatic (FASD)
With MN5L relay
lStarter type ML10 / 12 — Semi-automatic (SASD)
With MN12L relay
lStarter type MN16 / 25 / 32 — Semi-automatic (SASD)
MN45 / 65 — Fully-automatic (FASD)
MN80 / 110 / 140 — Fully-automatic (FASD)
MN400 — Fully-automatic (FASD)
lStarter type MA25 — Semi-automatic (SASD)
MA25 — Fully-automatic (FASD)
Starters
Starter type MK1 — Semi-automatic (SASD)B (5 / L3)
9443
44
96
95
A2
A1
R (1 / L1)
20 21
MK1 SEMI AUTOMATIC STAR DELTA STARTER
Note: Relay to be set for 0.6 times Full Load Line Current.
KEY DIAGRAMMK1 SEMI - AUTOMATIC
A2 B2 C2
TO MOTOR TERMINALS
A1 B1C1
A B C 5 A B C
TO SUPPLY
R Y B
P1 P2 P3 P4
H
B
P1
STOP / RESET
P2
P4
P3
K
H
5
NO
START
NC
NC
H
R
STOP / RESET
R Y B K R Y B
A B C
R Y B
START
MK1 SASD
0
22 23
Notes: 1. Relay to be set for 0.6 times Full Load Line Current.2. Timer used - Combination coil type - MK1 Thermal Timer.
MK1 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAMMK1 FULLY - AUTOMATIC
R Y B
TO SUPPLY
A B C
P1 P2 P3 P4
H
A B C
A2 B2 C2
T
K
2 3
1
TO MOTOR TERMINALS
A1 B1C1
B
P1
STOP / RESET
P2
P4
START
P3
KNO
H
5
NO
H
R
NC
NC
NC TT
MK1 FASD
STOP / RESET
START
R Y B K R Y B R Y B
A B C
0
24 25
MU1 / MU2 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MU1 / MU2 SEMI AUTOMATIC STAR DELTA STARTER
R Y B
STOP / RESET
96 95
1 / L1 3 / L2 5 / L3 START I
93 942 / T1 4 / T2 6 / T3
H
1 / L1 3 / L2 5 / L3 7 / L4
A2
2 / T1 4 / T2 6 / T3 8 / T4
B1 A1 C1
A1
1 / L1 3 / L2 5 / L3
A22 / T1 4 / T2 6 / T3
A1
21
22
1 / L1 3 / L2 5 / L3 7 / L4
A1 A22 / T1 4 / T2 6 / T3 8 / T4
22
21
A2 B2 C2
R
96
95
9394
7 / L4
8 / T4
a / H
7 / L4
a /
8 / T4
21
22
b /
A1A1
H
A2 A2
B
21 22
b /
A2
A1
MU1, MU2 SASD
0
26 27
Notes: 1. For phase to supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 96 - 1 / L1 &
connect 95 to Neutral.3 For external pilot supply omit wires 96 - 1 / L1 and A2 5 / L3.
MU1 / MU2 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MU1 / MU2 FULLY AUTOMATIC STAR DELTA STARTER
R Y B
STOP / RESET
96 95
H
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3 7 / L4
A2A12 / T1 4 / T2 6/ T3 8 / T4
STARTI
93 94
1 / L1 3 / L2 5 / L3 7 / L4
A2A1
2 / T1 4 / T2 6 / T3 8 / T4
21
22R
1 / L1 3 / L2 5 / L3 7 / L4
8 / T46 / T34 / T22 / T1A2A1
T
2
1
A2 B2 C2
B-21
22
B1 A1 C1
R
96
95
9394
7 / L4
a / H
8 / T4
7 / L4
a /
8 / T4
22
21
b /
A1A1
A2
H
A2
B
21 22
b /
A2
A1
1
2
T
MU1 , MU2 FASD
0
28 29
Notes: 1. For phase to supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 96 - 1 / L1 &
connect 95 to Neutral.3 For external pilot supply omit wires 95 - 1 / L1 and A2 5 / L3.
MB1 / MB2 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MB1 / MB2 SEMI AUTOMATIC STAR DELTA STARTER
R B Y
B1 A1 C1
O / R
A2 B2 C2
H
1 / L1 3 / L2 5 / L3 7 / L4
8 / T48 / T34 / T22 / T1
A2A122
21 1 / L1 3 / L2 5 / L3 7 / L4
A1 A2
2 / T1 4 / T2 6 / T3 8 / T4
21
22
1 / L1 3 / L2 5 / L3 7 / L4
A1 A2
2 / T1 4 / T2 6 / T3 8 / T4
1 / L1 3 / L2 5 / L3OFF / RESET
95
START
9498 98
2 / T1 4 / T2 6 / T3
R
95
9694
8 / T4
7 / L4
a / H
7 / L4
a /
8 / T4
21
b /
22
A1A1
H
A2 A2
B
21 22
b /
A2
A1
MB1, MB2 SASD
30 31
Notes: 1. For phase to supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 96 - 1 / L1 &
connect 95 to Neutral.3 For external pilot supply omit wires 95 - 1 / L1 and A2 5 / L3.
KEY DIAGRAM MB1 / MB2 FULLY AUTOMATIC STAR DELTA STARTER
R
95
9694
8 / T4a / H
7 / L4
7 / L4
a /
8 / T4
21
22
b /
A1A1
H
A2 A221 22
b /
A2
A1
1
T
2
MB1, MB2 FASD
MB1 / MB2 FULLY AUTOMATIC STAR DELTA STARTER
R Y B
1 / L1 5 / L33 / L2 7 / L4
2 / T1 4 / T2 6 / T3 8 / T4
A2A1
21
22
1 / L1 3 / L2 5 / L3 7 / L4
2 / T1 4 / T2 6 / T3 8 / T4A1 A2
1 / L1 3 / L2 5 / L3
H
OFF / RESET
O / RSTART
I95
94
A2 B2 C2
B1 A1 C1
1 / L1 3 / L2 5 / L3 7 / L4
2 / T1 4 / T2 6 / T3 8 / T4
21
22A1 A2
97
9896
T1
2
2 / T1 4 / T2 6 / T3
B
32 33
ML1.5 / 2 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM ML1.5 / 2 SEMI AUTOMATIC
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 96 - 1 / L1 - &
connect 96 to neutral.3. For external pilot supply disconnect wires 96 - 1 / L1 &
A1 - 5 / L3 and connect external pilot supply to 96 & A1.
R( 1 / L1)
96
95STOP / RESET
START94
93
43 23
2444H
12
11
A2 A2
H
A1 A1
B(5 / L3)
11 12
A2
A1
SUPPLY
R Y B
STARTSTOP RESET 1 / L1 3 / L2 5 / L3
96 95 93 94
H
A1 A2
11 23
12 24
31
32
43
44
11 23
12 24
31
32
43
44A1 A2
A1 A2
11 23
12 24
31
32
43
44
A2 B2 C2 C1 A1 B1
MOTOR
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
ML1.5, ML 2 SASD
0 I
34 35
ML1 / ML1.5 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM ML1 / ML1.5 FULLYAUTOMATIC STAR DELTA STARTER
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect wire A1
5 / L3 and connect A1 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 and A1-
5 / L3 and connect external pilot supply to 95 & A1.
R(1 / L3)
95
96
STOP / RESET
START
93
94
43
44
31
32
43
44
H
A2
A1
A2
A1
H
A1
A2
31
Tb
a
32
32
1
B(5 / L3)
SUPPLY
R Y B
STARTSTOP / RESET
96 98 93 941 / L1 3 / L2
5 / L3
A2
H
A2
A1
31
32
43
44
C1 A1 B1
TO MOTOR TERMINALS
B2 C2
TO MOTOR TERMINALS
A1
A2 31
32
43
44 A1
A2 31
32
43
44
T
a
b2
1
3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
ML1, ML1.5 FASD
0 I
36 37
ML2 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM ML2 FULLY AUTOMATIC STAR - DELTA STARTER
Notes: 1. For 440 V coils connect X1 to 5 / L3 and X2 to 1 / L1.2. For 230 V coils connect X1 to neutral & X2 to 1 / L1 .3. For operating on external supply connect X1 and X2
external supply.4. Check that all coils are rated at the same voltage.
X2
96
95STOP / RESET
94
93START
43
44H
24
23
11
12
A2A2
A1 A1
H
X111 12
L&T TIMER WITH TIMER COIL
A1
A2
T
T
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
ML2 FASD
X1 X2 STOPRESET
96 95
0 1 / L1
3 / L2 5 / L3
START-
93 94
H
A1 A2
11
12
43
44
A2 B2 C2
11
12A1 A2
43
44
11
12A1 A2
43
4424
23
C1A1 B1
MOTOR
T
R Y B
SUPPLY
38 39
ML3 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM ML3 SEMI AUTOMATIC STAR - DELTA STARTER
Notes: 1. For 440 V coils connect X1 to 5 / L3 and X2 to 1 / L1.2. For 230 V coils connect X1 to Neutral & X2 to 1 / L1. 3. For operating on external, supply connect X1 and X2
external supply.4. Check that all coils are rated at the same voltage.
X2
96
95STOP / RESET
94
93START
43H
44
24
23
11
12
A2A2
H
A1 A1
X111 12
A1
A2
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
ML3 SASD
X1 X2
96 95
0 1 / L1
3 / L2 5 / L3
-
93 94
H
A1 A2
11
12
43
44
A2 B2 C2
11
12A1 A2
43
44
11
12A1 A2
43
4424
23
C1A1 B1
MOTOR
R Y B
SUPPLY
STOPRESET
START
40 41
ML3 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM ML3 FULLY AUTOMATIC STAR - DELTA STARTER
Notes: 1. For 440 V coils connect X1 to 5 / L3 and X2 to 1 / L1.2. For 230 V coils connect X1 to Neutral & X2 to 1 / L1. 3. For operating on external supply connect X1 and X2
to external supply.4. Check that all coils are rated at the same voltage.5. ET 100 to be chosen to have total break to make.
delay of 40 - 60 millisec for the NC contact.
X2(1 / L1)
96
95
94
STOP / RESET
START93
43
44H
24
23
12 11
11
12
9T
8
A2A2
H
A1 A1
X1(5 / L3)
A1
A2
12
H
11 43
44
4
5
T
6
7
T
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
ML3 FASD
MOTOR
TIMER
MOTOR
X2X11 / L1 3 / L2 5 / L3
0
1 2 3 4 5
7 8 9 106
96 95
H
A1 A2
11 11
12 1232 3244 44
43 4323 23
24 24
31 31
A2 B2 C2
A1 A2
11
12 32 44
4323
24
31
A1 A2
A1 B1 C1
SUPPLY
R Y B
START-
93 94
STOPRESET
43
ML4 / 6 FULLY AUTOMATIC STAR DELTA STARTER (WITH MN5 RELAY)
KEY DIAGRAM ML4 / 6 FULLY AUTOMATIC STAR - DELTA STARTER
Notes: 1. For phase to phase pilot supply follow the wiringdiagram exactly.
2. For phase to neutral pilot supply disconnect 95 - 1 / L1 - &connect 95 to neutral and disconnect timers terminals 6& 7 & connect to 1 & 2.
3. For external pilot supply omit wires 95 - 1 / L1 & A2 5 / L3and connect external pilot supply to 95 and A2.
4. 97 & 98 is a potential free contact and can be usedfor trip alarm / indication.
R(1 / L1)
STOP / RESET
95 97
9896
43
START
94
H44
4
5
T
24
23
11
12
11
12
9
8
T
43A1
A244
11
H
12
6T
7
A1
A1
H
A2
B( 5 / L3)
A2
42
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A2 B2 C2
1 2 3 4 5
6 7 8 9 10
TIMER94
96 98
9795
O / R
OFF / RESET
STA
RT
C1 A1 B1
A1 A2
11
12
23
24
31
32
43
44
A1
A2
1211
23
24
3231
43
44
A1 A2
H11
12 24
23 43
44
R Y B
SUPPLY
MOTOR1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
Ml4 / 6 FASD
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44 45
ML10 / 12 FULLY AUTOMATIC STAR DELTA STARTER (WITH MN12L RELAY)
KEY DIAGRAM ML10 / 12 FULLY AUTOMATIC STAR - DELTA STARTER
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect the phase
from 31 and connect neutral to 31.3. For external pilot supply disconnect both phases at
31 & 41 and connect external supply to 31 and 41.* R = Right Add on Block* L = Left Add on Block
B(5 / L3)
R(1 / L1)
31
32
95OFF / RESET
START
96 94
8T
9
2
1
4
*L
3 1
2H
A16
T
7
A1
A2
A1
A2
H
41 42
A2
5
4T
*R
2 4
*R
313
4
H
1 2 3 4 5
6 7 8 9 10
TIMER31 41
3242 A1
A2 2
1 3
4
2
1 3
4
B1 A1 C1
TO MOTOR TERMINALS
A1
A2
2
3
4
1
2
3
4
1
A1
A2
H
B Y R
SUPPLY
B2A2 C2
TO MOTOR TERMINALS
OFF / RESET
O / RSTA
RT
95
94 96 98
97
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
ML10 / 12 FASD
I
46 47
MN16 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN16 SEMI AUTOMATIC STAR - DELTA STARTER
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2A1
A2
A1 A2
21
22
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
52
51 13
14
13
14
C1 A1 B1 A2 B2 C2
MOTOR
R Y B
SUPPLY
OFF / RESET
STARTO/R
94 96
97
98
95
H
B
95
9694
13a / H
13a /
1414
52
51
b /
A2 A1
H
A1 A222 21
b /
R
A2
A1
MN16 SASD
B
I
48 49
MN16 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN16 FULLY AUTOMATIC STAR - DELTA STARTER
Note for timer :* Use terminal no. 6 & 7 for 415V supply* Use terminal no. 1 & 2 for 360V supply
95
96
94
13
a / H
13
1414
a /
T
4
5
52
51
b /
A1A2
H
A1 A222 21
A1
b /
T
2
1A2
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2
R Y B
SUPPLY
C1 A1 B1 A2 B2 C2
MOTOR
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
OFF / RESET
START
94 96
97
98
95O/R
1 2 3 4 5
6 7 8 9 10
TIMER
21
22
51
52
13
14A1 A2
A1 A2
H*
*
MN16 FASD
C
13
14
I
R
50 51
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 95 - 1 / L1 - &
connect 95 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN25 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN25 SEMI AUTOMATIC STAR - DELTA STARTER
MOTOR
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2A1
A2
A1 A2
21
22
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
52
51 13
14
13
14
C1 A1 B1 A2 B2 C2R Y B
SUPPLY
OFF / RESET
STA
RT
O / R
94 96
97
98
95
H
R
95
9694
13a / H
13a /
1414
22
21b /
A1 A1
H
A2 A222 21
b /
B
A1
A2
MN25 SASD
I
B
B
52 53
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 95 - 1 / L1- &
connect 95 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN25 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN25 FULLY AUTOMATIC STAR - DELTA STARTER
MOTOR
C1 A1 B1 A2 B2 C3
SUPPLY
R Y B
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2 A1 A2
A1 A2
21
22
13
14
21
22
13
14
21
22
13
14
H
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
OFF / RESET
STA
RT
O / R
9496
97
98
95
1 2 3 4 5
6 7 8 9 10
TIMER
R
95
9694
13a / H
13
a /1414
22
21
b /
A1 A1
H
A2 A222 21
b /
B
A1 6
A2 7
T
4
5
B
T
MN25 FASD
I
54 55
Notes: 1. For phase to phase supply, follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 95 - 1 / L1 - &
connect 95 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN32 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN32 SEMI AUTOMATIC STAR - DELTA STARTER
C1 A1 B1 A2 B2 C2
MOTORSUPPLY
R Y B
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3A1 A2
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3A1 A2
21
22
21
22
13
14
21
22
13
14
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3A1 A2
H
94 96
97
98
95
O/R
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
R
95
9694
13a / H
13a /
1414
22
21
b /
A1 A1
H
A2 A222 21
b /
B
A1
A2
MN32 SASD
I
B
OFF / RESET
STA
RT
56 57
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 95 - 1 / L1- &
connect 95 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN32 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN32 FULLY AUTOMATIC STAR - DELTA STARTER
C1 A1 B1 A2 B2 C3
MOTORSUPPLY
R Y B
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2 A1 A2
A1 A2
21
22
13
14
21
22
13
14
21
22
13
14
H
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3O / R
94 96
97
98
95
1 2 3 4 5
6 7 8 9 10
TIMER
R
95
9694
13a / H
13a /
1414
22
21b /
A1 A1
H
A2 A222 21
b /
B
A1 6
A2 7
T
4
5T
MN32 FASD
I
OFF / RESET
STA
RT
44
43
58 59
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 95 - 1 / L1 - &
connect 95 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN45 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN45 FULLY AUTOMATIC STAR - DELTA STARTER
R
95
9694
a / H
13
a /14
22
21
b /
A1 A1
H
A2 A232 31
b /
B
A1 6
A2 7
T
4
5T
9
8
A1 A2
21
22
1/ L1
2 / T1
3 L2/
4 T2/ 6 T3/
35 / L31 43
4432A1 A2
1 / L1
2 / T1 4 / T2 6 / T3
3 / L2 5 L3/21 13
1422
A1 A222
21 1 / L1
2 T1/
3 L2/
4 / T2 6 / T3
5 / L3 13 43
4432
1 / L1 3 / L2 5 L3/
97
95START
9694 98
2 / T1 4 / T2 6 T3 /
6 7 8 9 10
1 2 3 4 5
I ERT MH
RO /
TOFF / RESE
R Y B
SUPPLY
C1 A1 B1 A2 B2 C2
MOTOR
MN45 FASD
I T
13
14
13
14
60 61
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect 95 - 1 / L1- &
connect 95 to neutral.3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN65 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN65 FULLY AUTOMATIC STAR DELTA STARTER
MN65 FASD
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3A1 A2
13
14
21
22
41
42
43
44
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2
13
14
21
22
41
42
43
44
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2
13
14
21
22
41
42
43
44
H1 2 3 4 5
6 7 8 9 10
TIMER
O / R
94 96
97
98
95
2 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
C1 A1 B1 A2 B2 C2
SUPPLY
R Y B
R
95
9694
43a / H
43a /
4444
32
31b /
A1 A1
H
A2 A232 31
b /
B
A1 6
A2 7
T
4
5T
9
8T
32
31
13
14
I
b / H a /
STA
RT
OFF / RESET
TMO OR
62 63
Notes: 1. For phase to phase pilot supply follow the wiringdiagram exactly.
2. For phase to neutral pilot supply disconnect 95 - 1 / L1- &connect 95 to neutral.
3. For external pilot supply omit wires 95 - 1 / L1 & A2 - 5 / L3.
MN80 / MN110 / MN140 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN80 / MN110 / MN140 FULLY
AUTOMATIC STAR-DELTA STARTER
MN80 , MN110 , MN140 FASD
R Y B1 / L1 3 / L2 5 / L3
2 / T1 4/ T2 6 / T3A1 A2
13
14
21
22
31
32
43
44
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3A1 A2
13
14
21
22
31
32
43
44
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2
13
14
21
22
31
32
43
44
H
B1 C1 A1
O / R
94 96
97
98
95
B2A2 C22 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 / L3
a /b / H
B
95
9694
43a / H
43a /
4444
32
31b /
A1 A1
H
A2 A232 31
b /
R
A1 6
A2 7
T
4
5T
9
8
T
32
31
13
14
TIMER
1 2 3 4 5
6 7 8 9 10
STA
RT
OFF / RESET
64 65
MN400 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MN400 FULLY AUTOMATIC STAR - DELTA STARTER
Notes: 1. For phase to phase pilot supply follow the wiringdiagram exactly.
2. For phase to neutral pilot supply disconnect 95 - 1 / L1 &connect 95 to neutral.
3. For external pilot supply omit wires 95 -1 / L1 & A2 - 5 / L3.
R Y B1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3A1 A2
13
14
21
22
31
32
43
44
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6/ T3A1 A2
13
14
21
22
31
32
43
44
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
A1 A2
13
14
21
22
31
32
43
44
H
B1 C1 A1
O/R
94 96
97
98
95
B2A2 C22 / T1 4 / T2 6 / T3
1 / L1 3 / L2 5 /L3
1 2 3 4 5
6 7 8 9 10
TIMER
a /b / H
B
95
9694
43a / H
43a /
4444
32
31b /
A1 A1
H
A2 A232 31
b /
R
A1 6
A2 7
T
4
5T
9
8
T
32
31
13
14
MN400 FASD
STA
RT
OFF / RESET
66 67
MA25 SEMI AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MA25 SEMI AUTOMATIC STAR - DELTA STARTER
R
96
95STOP / RESET
94
93START
13H
13
1414
22
21
A2A2
A1 A1
21 22
A1
A2
B
H
Y
96 95
A1 A1A2 A22 / T1
2 / T1
4 / T2
4 / T2
6 / T3
6 / T3
22 2214 14
13 1321 215 / L3 5 / L33 / L2 3 / L21 / L1 1 / L1H
1 / L1 3 / L2
1 / L1 3 / L2
A1 A2
2 / T1 4 / T2 22 14
13215 / L3
6 / T3
R Y B
SUPPLY
A2 B2 C2 C1 A1 B1
MOTOR
START
93 94
3 / L3
MA25 SASD
O I
STOPRESET
68 69
MA25 FULLY AUTOMATIC STAR DELTA STARTER
KEY DIAGRAM MA25 FULLY AUTOMATIC STAR - DELTA STARTER
R
96
95STOP / RESET
94
93START
13H
13
1414
22
21
A2A2
A1 A1
21 22
A1
A2
T
B
H
T
STOP/RESET
Y
96 95
A1 A1A2 A22 / T1
2 / T1
4 / T2
4 / T2
6 / T3
6 / T3
22 2214 14
13 1321 215 / L3
5 / L33 / L2
3 / L21 / L1
1 / L1H
1 / L1 3 / L2
1 / L1 3 / L2
A1 A2
2 / T1 4 / T222 14
13215 / L3
6 / T3
R Y B
SUPPLY
A2 B2 C2 C1 A1 B1
MOTOR
START
93 94
5 / L3T
T TIMER
RELAY
CONTACTOR
CONT ACTOR
CONTACTOR
MA25 FASD
IO
70 71
ML1 REVERSING STARTERSECTION IV
Normal Connections for reversing Starters Starter type ML1 lStarter type Ml2 / 3
Normal Connections for pole changing Startersl Pole changing starter
(for motor with two separate windings) - Type MK1l Pole changing starter
(for motor with tapped windings) - Type MK1
Section IV contains wiring diagrams of the starters which are not manufacture red by L&T at present. Wiring diagram of such starters are given for reference purpose,
R Y B
STOP / RESET
0
96 95
1 / L1 3 / L2 5 / L3
FORWARD
93 94
REVERSE
STOP START
0
R
A1 A2
11 23
12 24
31 43
3244
ABCREVERSE
MOTOR TERMINALS
FORWARD
F
A1 A2
11 23
1224
31 43
32 44
I
I
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
1 / L1 3 / L2 5 / L3
2 / T1 4 / T2 6 / T3
POWER TERMINAL MARKING
72 73
Notes: 1. For phase to phase supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect wire
96 - 1 / L1 - & connect 96 to neutral.3. For external pilot supply omit wires 96 -1 / L1 &
94 - 5 / L3 and connect external pilot supply to 96 & 94.
ML2 / 3 REVERSING STARTERML1 REVERSING STARTER
R(1 / L1)
96
STOP / RESET
95
STOP
32 R
31
A2
F
A1
F93 23
START
94 24
B(5 / L3)
23
24R
START
A1
A2
R
32
31 F
STOP START
REVERSE0 1
0
96 95 93 94
I1 / L1 3 / L2 5 / L3
R Y B
STOP / RESET START FORWARD
R 11 43
31
3244
23
2412
A2A1
F
A1 A2 12
1123
24
31
43
3244
A B CMOTOR TERMINAL
74 75
Notes: 1. For phase to phase pilot supply follow the wiring diagram exactly.2. For phase to neutral pilot supply disconnect wire
96 - 1 / L1 - and connect 96 to neutral.3.For external pilot supply omit wires 96 - 1 / L1 &
94 - 5 / L1 and 94 - 5 / L3 and connect external pilot supply to 96 & 94.
KEY DIAGRAM ML2 / 3 REVERSING STARTER
POLE CHANGING STARTER
(FOR MOTOR WITH TWO SEPARATE WINDINGS) - TYPE MK1
R(1 / L1)
96
STOP / RESET
95
STOP
31 R
32
A1
FA2
F
93 24
START
94 23
B(5 / L2)
24
23
R
START
A2
A1R
31
32 F
R Y B
SLOW
STOP / RESET0
P1 P2
START
P3 P4 P1 P2
0
STOP/RESET
R Y B
FASTSTART
P3 P4
R RY YB B
S A AB BC C5 5F
MOTOR
LA HA LB HB LC HC
-
76 77
KEY DIAGRAMPOLE CHANGING STARTER
(FOR MOTOR WITH TWO SEPARATE WINDINGS)
POLE CHANGING STARTER
(FOR MOTOR WITH TAPPED WINDINGS) - TYPE MK1
B
ASF TRTSTA
P4
P3
P4WSLO
START
P3
F S
A1
F
A2 A2
S
F S
P2
P1O /ST P SRE ET
P2
O /ST P SRE ET
P1
R
A1
A2
B2
B3 C3
C2A3
C2
A3
A2C3
B3
B2
SLOW SPEED FAST SPEED
STOP / RESET
SLOW
R Y B
P1 P2 P3
START-
R Y B
S A B C
A3 C2 B3 B2 C3 A2
MOTOR
P3P4 P1 P2 P4
0-
R Y B
A B C 5F
STOP/RESET
FAST
START
5C
BY
BAN
R
5
0
78 79
KEY DIAGRAM POLE CHANGING STARTER (TYPE MK1)
(POLE CHANGING STARTER FOR MOTOR WITH TAPPED WINDINGS)
SECTION V
Applications
lMK1 DOL for single phase application
lMF1 starter for single phase application
l Connections for remote push buttons
l Connection when single-pole switch, float switch, thermostat or other automatic control is used
lPower scheme for relay bypass
lControl circuit for relay bypass
lImproved circuit for relay bypass
lStar-delta control circuit using ETR 550
lFlip-float circuit-for equal "ON-OFF" interval using ETR 600
lFlip-flop circuit for un-equal "ON-OFF" intervals
A2
A3
C2
B3
B2
C3
R
Y
B
SLOW
A2A2 A2
A1 A1
N
N F S
N
F
A1
SF
S
B
P4
P3
P4
P3
AS F TRTSTA
L S OWRSTA T
FA TSSTA T / RR SETE
SLOWSTART / RESET
P1
P2
P1
P2
R
FAST
B3
C2
A3
A2
B2
C3
R
Y
B
80 81
MK1 DOL FOR SINGLE PHASE APPLICATION
MF1 STARTER FOR SINGLE PHASE APPLICATION
MK1 DOL
STOP / RESET
Ph N
R Y B
P1 P2 P3 P4
A B C 5
Ph N
-0
MOTOR
MOTOR
START
82 83
Additional start push button should be connected in parallel. Additional stop push button should be connected in series.
The motor starter remains in the closed position as long as the start
push-button is being pressed down.
CONNECTION WHEN SINGLE - POLE SWITCH, FLOAT SWITCH,
THERMOSTAT OR OTHER AUTOMATIC CONTROL IS USED
CONNECTIONS FOR REMOTE PUSH BUTTONS (ON - OFF)
B(5 / L3)
94
93
95
96
A1
STOP / RESET
A2
R(1 / L1)
START
START (REMOTE)START(RELAY)
STOP (REMOTE)
STOP / RESET (RELAY)
96
95
NO. OFCONTACTOR
44
43
93
94
84 85
A = Main ContactorB = Relay Bypass Contactor
Timer setting should be greater than motor starting time.
CONTROL CIRCUIT FOR RELAY BYPASS
POWER SCHEME FOR RELAY BYPASS
B
BR Y
A
MOTOR
A - 1NO + 1NCB - 2 NOT1 - 1NC (TIMER)
FUSE
STOP(REMOTE)
A T1 B
B A B
STOP / RESET
START
T1
A
86 87
When contactor "B” is welded, relay is permanently by passed and the motor is not protected. To overcome this, another timerT2 is introduced as shown in the figure the time delay of timer T2 is to be kept greater than time delay of timer T1.when contactor "B" is welded, NC contact of timer T2 will disconnect coil A. Thus the motor is switched off.
ETR550 Timer is manufactured by G.I.C. Pune and Marketed by L&T. X1 and X2 is to be connected to Voltage source.
STAR DELTA CONTROL CIRCUIT USING ETR550
IMPROVED CIRCUIT FOR RELAY BYPASS
A - 1NO + 1NCB - 2 NOT1 - 1NCT2 - 1NC
X1
STOP / RESET
STARTH
H
a1
ETR550
b1
H
X2
TofTof
STOP / RESET
T1
A
BB
T2
FUSE
STOP(REMOTE)
START
FUSE
T1A T2
A
B
AUXILIARY CONTACTS USED
88 89
FLIP- FLOP CIRCUIT FOR UNEQUAL ‘ON-OFF’ INTERVALS
FLIP-FLOP CIRCUIT FOR EQUAL ‘ON-OFF’ INTERVALS USING ETR600
Timers - 2 Nos. EM10003,4,5 - Inst. Changeover Contact6,7,8 - Delayed Changeover Contact
PH
1
4 3
C
T
NEUTRAL
TIMER : ETR 600
MODE SELECTION
CYCLIC - EQUAL ON/OFF(INSTANT)
CYCLIC - EQUAL ON/OFF(DELAYED)
2-10
1-3-4
2-10
1-3-4
START (SWITCH)
PHASE
T2 INST4
5 3
7
86
T1 DEL
1
C1
2
NEUTRAL
2
1
C2
6
7
8
T2 DEL
4
35
T1 INST
A1 15 15
TC T
1616A2
90 91
STAR-DELTA STARTERS (MN SERIES)SECTION VI
Chart of relay ranges & back up fuses
l
Star-Delta starters (ML series)
Chart for DOL motor starters with ML relays
Chart for DOL motor starters with MN relays
Chart for Star-Delta motor starters with ML relays
Chart for Star-Delta motor starters with MN relays
Chart for DOL starters type MK1 / MF1
Chart for Star-Delta starters type MK1
Chart for DOL starters type MU / MB
Chart for Star-Delta starters type MU / MB
Chart for MN starter
Star-Delta starters (MN series)
l
l
l
l
l
l
l
l
l
l
Starter
MN 16 SASD
MN 16 FASD
MM 25 SASD
MM 25 FASD
MM 32 SASD
MN 32 FASD
MN 45 FASD
MM 65 FASD
MN 80 FASD
MN 110 FASD
MN 140 FASD
MN 400 FASD
Star
MN 16
MN 16
MN 25
MN 25
MN 32
MN 32
MN 45
MN 65
MN 80
MN 110
MN 140
MN 400
Delta
MN 16
MN 16
MN 25
MN 25
MN 32
MN 32
MN 45
MN 65
MN 80
MN 110
MN 140
MN 400
Hold on
MN 16
MN 16
MN 25
MN 25
MN 32
MN 32
MN 45
MN 65
MN 80
MN 110
MN 140
MN 400
Timer
ET-100
ET-100
ET-100
ET-100
ET-100
ET-100
ET-100
ET-100
ET-100
Contactors
92 93
CHART FOR DOL MOTOR STARTERS WITH ML RELAYS
STAR-DELTA STARTERS (ML SERIES)
Details of Contactors and Timers used inML series star delta starters
Starters
ML 1.5 SASD
ML 1.5 FASD
ML 2 SASD
ML 2 FASD
ML 3 SASD
ML 3 FASD
ML 4 FASD
ML 6 FASD
ML 10 FASD
ML 12 FASD
STAR
ML 1
ML 1
ML 2
ML 2
ML 2
ML 2
ML 3
ML 4
ML 10
ML 12
DELTA
ML 1.5
ML 1.5
ML 2
ML 2
ML 3
ML 3
ML 4
ML 6
ML 10
ML 12
HOLD ON
ML 1.5
ML 1.5
ML 2
ML 2
ML 3
ML 3
ML 4
ML 6
ML 10
ML 12
Timer
-
GT-200
-
GT-200
-
ET-100
ET-100
ET-100
ET-100
ET-100
Contactors
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Sr. No.
Motor Rating 240 V-1 Phase
Motor Rating 415 V-3 Phase
Relay Range
Back up fuse SDF
0.125
0.25
0.5
0.75
hP
0.11
0.18
0.4
0.55
kW
2.0
3.6
hP
0.125
0.15
0.2
0.25
0.33
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
4.0
0.09
0.11
0.15
0.19
0.25
0.37
0.55
0.75
0.92
1.1
1.3
1.5
1.8
2.2
3.0
kWIn In
0.45
0.45
0.57
0.7
0.88
1.2
1.6
1.8
2.1
2.6
3.0
3.5
4.8
5.0
6.2
0.4-0.65
0.4-0.65
0.4-0.65
0.6-1.0
0.6-1.0
1.0-1.6
1.5-2.5
1.5-2.5
1.5-2.5
2.5-4.0
2.5-4.0
2.5-4.0
4-6.5
4-6.5
4-6.5
(A)
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
2
2
2
4
4
6
6
6
8
10
10
10
16
16
16
Rating
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
Type
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
Conta- ctor
94 95
Notes :
1) The full load currents given apply in the case of single phase motors, to capacitor - start type motors and in the case of 3 phase, motors, to squirrel cage type induction motors at full load having average power factor and efficiency. The motors should have speeds not less than the following :Upto 10 hp - 750 R.P.M, 10 to 30 HP - 600 R.P.M, 30 -125 HP - 500 R.P.M, 125 -300 HP - 375 R.P.M.2) Contactors / Switches indicated are the minimum ratings suitable for the application. Higher sizes / Ratings can be used.3) Normal motor starting times are assumed in all cases.
CHART FOR DOL MOTOR STARTERS WITH MN RELAYS
CHART FOR DOL MOTOR STARTERS WITH ML RELAYS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0.125
0.25
0.5
0.75
1.0
1.25
2.0
3.0
0.11
0.18
0.4
0.55
0.75
0.9
1.5
2.25
2.0
3.6
7.5
8.0
9.5
14.0
0.125
0.15
0.2
0.25
0.33
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
4.0
5.0
6.0
7.5
10.0
12.5
0.09
0.11
0.15
0.19
0.25
0.37
0.55
0.75
0.92
1.1
1.3
1.5
1.8
2.2
3.0
3.7
4.5
5.5
7.5
9.8
0.4
0.45
0.57
0.7
0.88
1.2
1.6
1.8
2.1
2.6
3.0
3.5
4.8
5.0
6.2
7.5
9.0
11.0
14.0
18.0
0.3-0.5
0.3-0.5
0.45-0.75
0.45-0.75
0.6-1.0
0.9-1.5
1.4-2.3
1.4-2.3
1.4-2.3
2.3-3
2.3-3
3-5
4.5-7.5
4.5-7.5
4.5-7.5
6-10
6-10
9-15
9-15
14-23
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1.5
2
2
2
4
4
6
6
8
8
10
10
16
16
16
20
20
25
32
32
50
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN63
16
17
18
19
20
21
22
23
24
25
1.0
1.25
2.0
3.0
5.0
6.0
7.5
10.0
12.5
15.0
17.5
20.0
25.0
30.0
3.7
4.5
5.5
7.5
9.3
11.0
13.0
15.0
18.6
22.5
7.5
9.0
11.0
14.0
18.0
21.0
24.0
28.0
35.0
40.0
6-10
6-10
10-16
10-16
13-21
20-32
20-32
20-32
28-42
28-42
ML0
ML0
ML0
ML1
ML1.5
ML1.5
ML2
ML2
ML3
ML3
20
25
25
32
50
63
63
63
80
80
HF
HF
HF
HF
HF
HF
HF
HN/00
HN/00
HN/00
FN32
FN32
FN32
FN32
FN63
FN63
FN63
FN100
FN100
FN100
0.75
0.9
1.5
2.25
7.5
8.0
9.5
14.0
Sr. No.
Motor Rating 240 V-1 Phase
Motor Rating 415 V-3 Phase
Relay Range
Back up fuse
SDF
hP kW hP kWIn In (A) Rating Type
Conta-ctor
Sr. No.
Motor Rating 240 V-1 Phase
Motor Rating 415 V-3 Phase
Relay Range
Back up fuse
SDF
hP kW hP kWIn In (A) Rating Type
Conta-ctor
96 97
CHART FOR DOL MOTOR STARTERS WITH MN RELAYS
Notes :1) The full load currents given apply in the case of single phase motors, to capacitor-start type motors and in the case
of 3 phase, motors, to squirrel cage type induction motors at full load having average power factor and efficiency. The motors should have speeds not less than the following : Upto 10 hp - 750 R.P.M., 10 to 30 hp - 600 R.P.M., 30 to 125 hp - 500 R.P.M., 125 to 300 hp - 375 R.P.M.
2) Relays upto and including range 20-33A : type Mn2, Relays from range 30-50A to range 66-110A : type-MN5, Relays from range 90-150A and above : type-MN12L
3) Contactors/Switches indicated are the minimum ratings suitable for the application. Higher sizes/Ratings can be used.4) Normal motor starting times are assumed in all cases.
Notes :1) Contactors/Switches indicated are the minimum ratings suitable for the application.
Higher sizes/Ratings can be used.2) For application above 35 hp suitable scheme to be employed to ensure change
over delay of 40-75ms between star and delta contactors.3) Normal motor starting times are assumed in all cases.
CHART FOR STAR - DELTA MOTOR STARTERS WITH ML RELAYS
Sr. No.
Motor Rating
Currentat 415V(A)
Relay Range
NominalBack up fuse SDF
hP kW PHASE
1.04
1.5
2.02
2.88
3.58
4.32
5.2
6.34
8.08
10.04
12.1
16.2
20.2
23
27
31.8
34.6
38.2
LINE
1-1.6
1-1.6
1.5-2.5
2.5-4.0
2.5-4
4-6.5
4-6.5
6-10
6-10
10-16
10-16
13-21
13-21
20-32
20-32
28-42
28-42
28-42
(A)
4
6
6
8
10
16
16
20
20
32
32
40
50
63
63
63
80
80
Rating
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HN/00
HN/00
HN/00
HN/00
Type/Size
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN63
FN63
FN63
FN100
FN100
FN100
FN100
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
1.5
2
3
4
5
6
7.5
10
12.5
15
20
25
30
35
40
45
50
0.75
1.1
1.5
2.25
3
3.75
4.5
5.5
7.5
9.3
11
15
18.5
22.5
26
30
33.5
37.5
1.8
2.6
3.5
5
6.2
7.5
9
11
14
18
21
28
35
40
47
55
60
66
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1
ML2
ML2
ML2
ML2
ML2
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1.5
ML1.5
ML2
ML2
ML3
ML3
ML3
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1.5
ML1.5
ML2
ML2
ML3
ML3
ML3
STAR LINE DELTA
Contactors
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Sr. No.
Motor Rating 240 V-1 Phase
Motor Rating 415 V-3 Phase
Relay Range
Back up fuse SDF
hP kW hP
15.0
17.5
20.0
25.0
30.0
35.0
40.0
45.0
50.0
60.0
75.0
90.0
100.0
125.0
150.0
175.0
200.0
225.0
11.0
13.0
15.0
18.6
22.5
26.0
30.0
33.5
37.0
45.0
55.0
67.5
75.0
90.0
110.0
130.0
150.0
168.0
kWIn In
21.0
24.0
28.0
35.0
40.0
47.0
55.0
60.0
66.0
80.0
100.0
120.0
135.0
165.0
200.0
230.0
275.0
300.0
14-23
20-33
20-33
30-50
30-50
30-50
45-75
45-75
45-75
66-110
66-110
90-150
90-150
90-150
135-225
180-300
180-300
180-300
(A)
ML1.5
ML2
ML2
ML3
ML3
ML4
ML4
ML4
ML4
ML6
ML10
ML10
ML10
ML10
ML10
ML12
ML12
ML12
63
63
63
80
80
100
100
125
125
160
200
200
250
250
315
315
400
400
Rating
HF
HF
HN/00
HN/00
HN/00
HN/00
HN/00
HN/00
HN/00
HN/0
HN/0
HN/0
HN/1
HN/1
HN/1
HN/1
HN/2
HN/2
Type
FN63
FN63
FN100
FN100
FN100
FN100
FN125
FN125
FN125
FN200
FN200
FN200
FN250
FN250
FN315
FN315
FN400
FN400
Cont-actor
A
98 99
CHART FOR STAR - DELTA MOTOR STARTERS WITH MN RELAYS
CHART FOR STAR - DELTA MOTOR STARTERS WITH MN RELAYS
Sr. No.
Motor Rating
Currentat 415V(A)
Relay Range
NominalBack up fuse SDF
hp kW
1.04
1.5
2.02
2.88
3.58
4.32
5.2
6.34
8.08
10.04
12.1
16.2
20.2
23
27
31.8
34.6
38.2
46.2
50
0.9-1.5
1.4-2.3
1.4-2.3
2-3.3
3-5
3-5
4.5-7.5
4.5-7.5
6-10
9-15
9-15
14-23
14-23
20-23
20-33
30-50
30-50
30-50
30-50
45-75
(A)
4
6
6
8
10
16
16
20
20
32
32
40
50
63
63
63
80
80
100
100
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HN/00
HN/00
HN/00
HN/00
HN/00
HN/00
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN32
FN63
FN100
FN125
FN125
FN125
FN125
FN125
FN125
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
1.5
2
3
4
5
6
7.5
10
12.5
15
20
25
30
35
40
45
50
60
65
0.75
1.1
1.5
2.25
3
3.75
4.5
5.5
7.5
9.3
11
15
18.5
22.5
26
30
33.5
37.5
45
48.5
1.8
2.6
3.5
5
6.2
7.5
9
11
14
18
21
28
35
40
47
55
60
66
80
87
Ml0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1
ML2
ML2
ML2
ML2
ML2
ML3
ML3
Ml0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1.5
ML1.5
ML2
ML2
ML3
ML3
ML3
ML4
ML4
Ml0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML0
ML1
ML1.5
ML1.5
ML2
ML2
ML3
ML3
ML3
ML4
ML4
Contactors
21
22
23
24
25
26
27
28
29
30
31
32
33
Sr. No.
Motor Rating
Currentat 415V(A)
Relay Range
NominalBack up fuse SDF
hp kW
54.5
57.5
69.2
77.9
95
115
132.8
159
178.9
187
208
222
288.6
45-75
45-75
45-75
66-110
66-110
90-150
90-150
135-225
135-225
135-225
135-225
180-300
180-300
(A)
125
125
160
160
200
250
250
315
400
400
400
500
500
RatingRating
HN/00
HN/00
HN/0
HN/0
HN/0
HN/1
HN/1
HN/1
HN/2
HN/2
HN/2
HN/3
HN/3
FN125
FN125
FN200
FN200
FN200
FN250
FN250
FN315
FN400
FN400
FN400
FN630
FN630
70
75
90
100
125
150
175
200
240
250
275
300
400
52
55
67.5
75
90
110
130
150
175
185
204
225
300
94
100
120
135
165
200
230
275
310
325
360
385
500
ML3
ML3
ML4
ML4
ML4
ML6
ML10
ML10
ML10
ML10
ML10
ML12
ML12
ML4
ML4
ML6
ML6
ML6
ML10
ML10
ML10
ML10
ML10
ML12
ML12
ML12
ML4
ML4
ML6
ML6
ML6
ML10
ML10
ML10
ML10
ML10
ML12
ML12
ML12
Contactors
Notes :1) Relays upto and including range 20-33A :Type MN2
Relays from range 30-50A to range 66-110A :Type MN5Relay ranges 90-150A and above :Type MN12L
2) Contactors /switches indicated are the minimum ratingssuitable for the application. Higher sizes/ratings can be used.
3) For applications above 35 hp suitable scheme to beemployed to ensure change over delay of 40-70 ms betweenstar and delta contactor.
4) Normal motor starting times are assumed in all cases.
LINE PHASE STAR LINE DELTA Type/SizeAALINE PHASE STAR LINE DELTA
Type/Size
100 101
* Cartridge type fuses are recommended
CHART FOR MF1 THREE PHASE / SINGLE PHASE
CHART FOR MK1 DOL STARTER
Motor rating in hp Relay scale
240 VSingle phase
415 V3 Phase
Amps(A)
Maximum safe ratingof back - up fused*
Rewireablefuses SWG
Cartridgefuses
0.125
0.25
0.5
0.75
1.00/1.25
2.00
3.00
0.125
0.25
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
4.0
5.0
6.0
7.5
0.4 - 0.65
0.6 - 1.0
1.0 - 1.6
1.5 - 2.5
1.5 - 2.5
1.5 - 2.5
2.5 - 4.0
2.5 - 4.0
2.5 - 4.0
4.0 - 6.5
4.0 - 6.5
4.0 - 6.5
4.5 - 7
6.5 - 11
6.0 - 10
6.0 - 10
10.5 - 17.5A
9.0 - 15
11 - 18
12 - 20A
4A
6A
6A
16A
16A
16A
25A
25A
25A
25A
25A
25A
25A
32A
32A
32A
32A
32A
32A
32A
35
32
32
25
25
25
23
23
23
23
23
23
23
21
21
21
21
21
21
21
Motor rating HP.
400V 3-phase
RelayAmps.Range
Back-up Fuse Rating
Minimum220 1 phaseCat No.
440V 3-phase
Maximum
Diazed SWT Diazed SWT
1A
2A
2A
4A
4A
4A
6A
6A
6A
15A
15A
25A
25A
25A
25A
25A
25A
25A
35A
35A
35A
35A
35A
35A
SS96210
SS96211
0.05
0.1
0.125
0.15
0.2
0.25
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
4.0
5.0
6.0
7.5
7.5
0.05
0.1
0.125
0.15
0.2
0.25
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
4.0
5.0
6.0
7.5
7.5
0.15 - 0.25
0.25 - 0.4
0.25 - 0.4
0.4 - 0.65
0.4 - 0.65
0.4 - 0.65
0.6 - 1.0
1.0 - 1.6
1.0 - 1.6
1.5 - 2.5
1.5 - 2.5
2.5 - 4.0
2.5 - 4.0
2.5 - 4.0
2.5 - 4.0
4.0 - 6.5
4.0 - 6.5
4.0 - 6.5
6 - 10
6 - 10
6 - 10
9 - 14
11 - 18
11 - 18
35
35
35
32
32
32
25
25
23
23
23
23
23
23
23
21
21
21
21
21
21
6A
6A
6A
6A
6A
10A
10A
10A
10A
10A
10A
10A
15A
15A
15A
15A
15A
15A
32
32
32
32
32
28
28
28
28
28
28
28
25
25
25
25
25
25
0.125
0.25
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.0
Note : Amp. rating of back-up fuse refers to the recommended diazed type HRC catridge fuse. Where rewirable semi-enclosed, tinned copper wire fuses are used, SWG number in table is approximate guide to size of wire required.
102 103
SELECTIOM CHART FOR MU / MB DOL STARTERS
CHART FOR MK1 STAR-DELTA STARTER
Note : Amp. rating of back-up fuse refers to the recommended diazed type HRC cartidge fuse. Where rewirable semi-enclosed, tinned copper wire fuses are used, SWG number in table is approximate guide to size of wire required.
Cat. No. SS 96254 & SS 96257 - FASD StartersCat. No. SS 96255 & SS 96258 - SASO Starters
Motor Rating
400/440 V3-phase
hp
RelayRangeAmps.
Back-up Fuse Rating
MinimumCat. No.
InV3
Miximum
Diazed SWT Diazed SWT
Full loadline
currentin Amps.
In
1.7
2.4
3.1
4.4
5.7
7.1
8.4
10.4
13.6
17
19.9
19.9
1
1.5
2
3
4
5
6
7.5
10
12.5
15
15
SS96254
&
SS96255
SS96257
&
SS96258
1
1.4
1.8
2.5
3.3
4.1
4.9
6
7.9
9.7
11.5
11.5
6
15
15
25
25
25
25
35
35
35
35
35
32
25
25
23
23
23
23
21
21
21
21
21
4
6
6
9
10
10
10
15
15
20
25
25
35
32
32
32
28
28
28
25
25
24
23
23
1-1.6A
1-1.6A
1.5-2.5A
2.5-4A
2.5-4A
4-6-5.A
4-6.5A
6-10A
6-10A
9-14A
9-14A
11-18A
7.5
10
12.5
15
15
7.5
10
12.5
15
15
5.5
7.5
9.3
11
11
5.5
7.5
9.5
11
11
11
14
18
21
21
11
14
18
21
21
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
32
50
50
63
63
32
50
50
63
63
FN32
FN63
FN63
FN63
FN63
FN32
FN63
FN63
FN63
FN63
9-15
14-23
14-23
14-23
20-33
9-14
13-21
13-21
13-21
20-32
MN2
MN2
ML2/3
ML2/3
MB1DOL
MB2DOL
MU1DOL
MU2DOL
MU1
MU2
MU1
MU2
Type Maximummotor rating
at 415v.3Ø 50Hz
Approx.Full loadCurrent
in
RelayRange
(A)
Relay Contactor Back-upHRC Fuse
SwitchDisconector Fuse Unit
Type Rating (A)
HP KW
HP
10
12
.5
15
20
25
30
35
40
45
50
60
65
70
75
90
10
0
12
5
15
0
17
5
KW
7.5
9.3 11 15
18
.5
22
.5
26
30
33
.5
37
.5
45
48
.5
52
55
67
.5
75
90
110
13
0
Ma
xim
um
Mo
tor
Ra
ting
at 4
15
V,
3p
h. 5
0H
z
Ap
pro
x.F
ull
Lo
ad
Cu
rre
nt
In(A
)
Ph
ase
Cu
rre
nt
In/ 3
Re
lay
Ra
ng
e (
A)
Re
com
me
nd
ed
Ba
ck-u
pH
RC
Fu
se
Typ
e
HF
HF
HF
HF
HF
HF
HN
00
HN
/00
HN
/00
HN
/00
HN
/00
HN
/00
HN
/00
HN
/00
HN
/0
HN
/0
HN
/0
HN
/1
HN
/1
14
18
21
28
35
40
47
55
60
66
80
87
94
10
0
12
0
13
5
16
5
20
0
23
0
MN
16
SA
SD
FA
SD
MN
25
SA
SD
FA
SD
MN
32
SA
SD
FA
SD
MN
45
FA
SD
MN
65
FA
SD
MN
80
FA
SD
MN
110
FA
SD
MN
14
0
FA
SD
8.0
8
10
.4
12
.1
16
.2
20
.2
23
27
31
.8
34
.6
38
.2
46
.2
50
54
.5
57
.5
69
.2
77
.9
95
115
13
2.8
6 -
10
9 -
15
9 -
15
14
- 2
3
14
- 2
3
20
- 3
3
20
- 3
3
30
- 5
0
30
- 5
0
30
- 5
0
45
- 7
5
45
- 7
5
45
- 7
5
45
- 7
5
45
- 7
5
66
- 1
10
66
- 1
10
90
- 1
50
90
- 1
50
Re
lay
Co
nta
cto
r S
witc
h D
isco
nn
ect
or
Fu
se U
nit
Ra
ting
20
32
32
40
50
63
63
63
80
80
10
0
10
0
12
5
12
5
16
0
16
0
20
0
25
0
25
0
FN
32
FN
32
FN
32
FN
63
FN
63
FN
63
FN
10
0
FN
10
0
FN
10
0
FN
10
0
FN
10
0
FN
10
0
FN
12
5
FN
12
5
FN
20
0
FN
20
0
FN
20
0
FN
25
0
FN
25
0
MN
2
MN
2
MN
2
MN
5
MN
5
MN
5
MN
5
MN
12
L
MN
16
W
MN
25
W
MN
32
MN
45
MN
65
MN
80
MN
110
MN
14
0
Typ
e
104 105
SELECTION CHART FOR MU / MB STAR- DELTA STARTERS
15
15
20
25
30
15
15
20
25
30
11 11 15
18
.5
22
.5
11 11 15
18
.5
22
.5
21
21
28
35
40
21
21
28
35
40
12
.1
12
.1
16
.2
20
.2
23
12
.1
12
.1
16
.2
20
.2
23
HF
HF
HF
HF
HF
HF
HF
HF
HF hf
32
40
40
50
63
32
40
40
50
63
FN
-32
FN
63
FN
63
FN
63
FN
63
FN
32
FN
63
FN
63
FN
63
fn6
3
9-1
5
14
-23
14
-23
14
-23
20
-33
9-1
4
13
-21
9-1
4
13
-21
20
-32
MN
2
MN
2
Ml2
/3
ML
2/3
MB
1S
AS
DM
U1
MU
2
MU
1
MU
2
Typ
e M
axi
mu
m m
oto
r r
atin
g a
t 4
15
V, 3
Ø5
0H
z
A
pp
rox.
Fu
ll lo
ad
Cu
rre
nt in
Re
lay
Ra
ng
e (
A)
Ph
ase
Cu
rre
nt
Re
lay
Co
nta
cto
r B
ack
-up
H
RC
Fu
se
S
witc
hD
isco
ne
cto
r F
use
Un
it
Typ
eR
atin
g (
A)
HP
KW
CHART FOR MN STAR - DELTA STARTERS
B2
SA
SD
MU
2S
AS
D
MU
1S
AS
D
106 107
CHART FOR MN DOL STARTERS S
witc
hD
isco
nn
ect
or
Fu
se U
nit
HP 2 2.5 3 4 5 6 7.5 10
7.5 10
12
.5
15
15
17
.5
20
25
30
30
35
40
45
KW
1.5
9.3
2.2 3 3.7
4.5
5.5
7.5
5.5
7.5
9.3 11 11 13
15
18
.5
22
.5
22
.5
26
30
33
.5
3 -
5
3 -
5
4.5
- 7
.5
4.5
- 7
.5
6 -
10
6 -
10
9 -
15
9 -
15
9 -
15
9 -
15
14
- 2
3
14
- 2
3
20
- 3
3
20
- 3
3
20
- 3
3
30
- 5
0
30
- 5
0
30
- 5
0
30
- 5
0
45
- 7
5
45
- 7
5
Typ
e
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HF
HN
/00
HN
/00
HN
/00
HN
/00
HN
/00
HN
/00
HN
/00
Ra
ting
16
16
16
20
20
25
32
32
32
32
50
63
63
63
63
80
80
80
10
0
10
0
10
0
FN
32
FN
32
FN
32
FN
32
FN
32
FN
32
FN
32
FN
32
FN
32
FN
32
FN
63
FN
63
FN
63
FN
63
FN
10
0
FN
10
0
FN
10
0
FN
10
0
FN
10
0
FN
10
0
FN
10
0
Ap
pro
x.F
ull
Lo
ad
Cu
rre
nt
In (
A)
Re
lay
Co
nta
cto
r R
eco
mm
en
de
dB
ack
- u
pH
RC
Fu
se
Re
lay
Ra
ng
e (
A)
Typ
e
3.5
4.8 5 6.2
7.5 9 11 14 11 14
18
21
21
24
28
35
40
40
47
55
60
Ma
xim
um
Mo
tor
Ra
ting
at 4
15
V,
3O
50
Hz
MN
2
MN
2
MN
2
MN
5
MN
5
MN
16
W
MN
25
W
MN
32
MN
45
MN
65
MN
16
DO
L
MN
25
DO
L
MN
32
DO
L
MN
45
DO
L
MN
65
DO
L
SECTION VIIInformation for Installation and Preventive maintenance
lCable connections to the terminals
lContact maintenance
lContact replacement
108 109
INFORMATION FOR INSTALLATION AND PREVENTATIVE MAINTENANCE
Cable connections to the terminalsWhen aluminum wires are used, the following method should be adopted:
2 If the wire is small—up to 1 mm— Single strand1. Clean the wire surface by rubbing with a small hard wire brush.2. Tin the wire immediately (within 2 or 3 minutes).3. Put wire under terminal clamp and tighten screws. Do not tighten to such an extent that the wire becomes flat.
Every two or three months, it may be necessary to ensure thatthe screws are tight and the wire has not become loose. Thismay happen because aluminum is soft and is likely to "flow".Always apply inhibiting grease around the terminal and wire toprevent moisture from reaching the area of contact. Applyinhibiting grease, only on the terminals and wire and not on thecontacts.
2If the wire is large—larger than 10 mm— Multi-strandWires should be connected with the help of cable lugs or thimbles.The cable lugs may be of "soldering" or "crimping" type.
For "soldering" type cable lugs:l Check that cable lug socket is clean and dry inside.l Clean every strand of aluminum wire with a small hard wire brush by opening out the cable strands.l Immediately dip all the strands in tin solder.
l
solder through the cable lug. Ensure that solder fills the entirespace inside the cable lug socket.
l Wipe off excess solder on cable insulation.l Connect the cable lug to the terminal and tighten terminal screws
using spring washers on the cable lug.l There should not be excess load on the cable lug, or else the
solder will becomes loose. Care must, therefore, be taken tocut the cable core and strip the insulation to the correct length.The cable lug should sit flat on the terminal and the cable shouldnot have sharp bends.
Every two or three months it is necessary to check whetherthe connection is firm and to tighten the screws, if necessary.Also check and ensure that the cable is not loose in the cablelug.
For "crimping" type cable lugs: Check that cable lug socket is clean and dry inside.l Clean every strand of aluminum wire with a small hard wire brush after opening strands.l Close the strand again immediately, insert to the proper length inside the cable lug socket and crimp, using the correct crimping tool.l Connect the cable lugs to the terminal and tighten terminal
screws using spring washers on the cable lug.
Contact maintenance
Contact tips are made of silver compositions like silver nickel and silver cadmium oxide. In normal use, these tips may show slight brown or black tarnish. If the atmosphere around the starter contains high moisture and sulphur, the contact tips will show excessive tarnishing. To clean the contact tips, use this maintenance procedure:
Insert the stranded cable in the proper size cable lug and pour
110 111
1. Rub the contact tips lightly will fine emery paper,DO NOT FILE THE CONTACT.
2. Remove small particles by rubbing with wet cotton wool orwith a wet, clean cloth.
3. Remove the water on the contact tip surface with a dry, cleancloth. If possible, apply acetone or carbon tetrachloride. Do not use petrol.
The maintenance procedure is necessary only if contact tipsare covered’ with thick, black tarnish film. If the contact tip is uneven,but not heavily tarnished, do not disturb the contact.
Contact replacementContact replacement becomes necessary if less than one-third of the original contact tip remains on the contact. This can beascertained by comparing the contact with a new one of the samestarter. When replacing contacts, change contact, springs and leafsprings, if any.
Note : Proper soldering of aluminum cables requires specialgrade of solders and fluxes meant for that purpose.
Normal solders and fluxes will produce a joint deceptivelyacceptable but it will in practice lead to over-heating andeventually to burn outs.
Trouble shooting chart for starters
l For DOL starters l For Star - Delta starters
SECTION VIII
112 113
Complaint 1. Motor does not start even though ‘Start’ button is pressed. However on
lifting the moving magnet manually, motor starts.
2. Relay/coil has been charged. However motor does not start when green button is pressed.
3. Motor starts when green button is pressed. It however stops immediately when it is released.
Reasons / Solutions
1. a) Coil does not get energised (see control wiring diagram)
b) Check nylon strip on relay, Check nylon button below start button. 2. Check if red wire on the relay and black wire on the
coil are properly connected.
3. a) Blue wire is not connected properly or completely absent. b) Hold-on contact moving strip is missing or
mproperly placed.
Trouble shooting chart for starters
Given below are some of the common complaints in starters.The probable cause and suggested remedy are also given. Butbefore attending to any complaint, ensure that the wiring is as perthe wiring diagram given in this booklet. Most of the complaints canbe traced to the wiring carried out at the site.
4. Humming and/orchattering noise.
5. Use of starters on 230V1Ø supply. Incoming /outgoing lines wired.However motor does notstart.
6. Remote start/stop button not working properly ;motor starts on remotestarts; however does notstop on remote stop.
7. Thermostat/float switch/pressure switch are wiredto the starter. Motor cannotbe stopped properly.Motor stops on pressingstop button. Howeverit restarts on releasing
8. Motor does not restartimmediately after trippingon O/L even though resetting has beenresorted to.
FOR DOL STARTERS:
4. a) Low supply voltage b) Magnet faces unclean.
Moving systemfunctioning isobstructed by dirt.
5. Coil obtains supply fromacross R & B supply.However if in/out wires areconnected on R & Y phasescoil will not energise. Youmay connect all threephase in series.
6. Red wire not wired as perwiring diagram.
7. No mistake in wiring hereHowever it is necessarythat the stop button is ofthe stay-put type orlocked in Off positionAlternatively, you couldshut them main switch.
8. It takes a little time forthe thermal bimetalto coil and reset. Hencewait for 2-4 minutesbefore restarting.
SECTION VIII
114 115
1. Motor works in Start. However it does not work properly in Delta
and refuses to take load.
2. a) Motor starts with difficulty in Starts or tip strips when
additional load is present. b) Motor works in Star.
However stops whenDelta connection comes on.
3. a) Even though all six wires have been Connected, motor stops
when in Delta.b) Motor stops when in
Delta, starter trips andfuse blows.
4. Relay has been changedin semi-automatic starter, however when themain switch is on, themotor starts immediatelywithout the necessity ofpressing the start button.Motor stops in Star itself.
1. Checked if only three wires are being terminated in terminal box of motor. Six wires should be connected to starter. If shorting
links are present they should be removed.
2. Reduce time delay from Star to Delta in case it is kept very long.
a) Or if a semi-automaticstarter is being used, switch
over from Star to Deltaearlier than done previously.
b) Possibly due to low system voltage.
3. a) Delta connection from motor is improper.
b) Low system voltage. Star / Delta connection in starter wrongly connected.
4. This is a usual complaint. You may have changed the original relay yourself. All factory made relays have loop\wires 2-3 wired, in semi-automatci starters. 2-4 terminals on relays must be connected. Checked
relay before connecting it on starter.
Capacitor Ratings for power Factor Improvement
SECTION IXFOR START - DELTA STARTERS:
116 117
CAPACITOR RATINGS FOR POWER FACTOR IMPROVEMENT
l these are only broad guidelines. l for actual values please contact capacitor manufacturer. l recommended capacitor ratings for direct connection to induction motors. for direct connection to induction motors to improve
power factor to 0.95 or better at all loads kvar ratings when speed is:
2.55
7.51015202530405060708090
100110120130140145150155160165170175180185190200250
12
2.534567911131517192123252729303132333435363738384045
12345678
1012.514.516.519212325272931323334353637383940404250
1.52.53.54.5679
101316182022242628303234353637383940414243434555
23.54.55.57.59
10.5121518202224262830323436373839404142434445454760
2.54
5.56.59
1214.5172125283134374043464952545556575960616263656770
MOTOR hp
3000 rmp
1500 rmp
1000 rmp
750 rmp
500 rmp
Existing Capacitor Rating In KVAr Per KW
Existing Power Factor = COS Ø1, Desired Power Factor = COS Ø2
Example :
Existing Power Factor COS 1 .......................0.70
Desired Power Factor COS 2 .......................0.95
Capacitor Rating As Per Table ....................... 0.69KVAr / kW
Active Load (For Example, Meter Reading) ......... 100kW
Required Capacitor Rating...........0.69 X 100 = 69KVAr
Ø
Ø
COS Ø1COS Ø2
0.400.420.440.460.480.500.520.540.560.580.600.620.640.660.680.700.720.740.760.780.800.820.840.860.880.900.92
0.801.541.411.291.181.080.980.890.810.730.660.580.520.450.390.330.270.210.160.110.05
------
0.851.671.541.421.311.211.111.020.940.860.780.710.650.580.520.460.400.340.290.240.180.130.080.03
----
0.901.611.681.561.451.341.251.161.081.000.920.850.780.720.660.590.540.480.430.370.320.270.210.160.110.06
-
0.951.961.831.711.601.501.401.311.231.151.081.000.940.870.810.750.690.640.580.530.470.420.370.320.260.210.160.10
12.292.162.041.931.831.731.641.561.481.411.331.271.201.141.081.020.960.910.860.800.750.700.650.590.540.480.43
118 119
l Our other Products
lSwitchgear Training Centers
lL&T Network
OUR OTHER PRODUCTS
lAir Circuit Brokers from 640 A to 6300A
lMoulder Case Circuit Breakers from 0.63A to 800A.
lSwitch Disconnector fuse from 32A to 800A.
lContactors from 6A to 550A
lThermal overload relay TypeMk1 / ML / MN1 / MN2 / MN5 / MN12 / MN12L
lChangeover switches for 63A to 1600A
lMotor Protection Circuit breakers 0.16A ti 63A
lBar mounted contactors Type N Series upto 3000A
lDC Heavy duty contactors Type LTHs upto 1250A
lNumeric Relays
lPanel Meters Rotary Switches
lPush button and Indicating lamps in 22.5mm. dia
lAuto Reset synchronous timers, Electronic timers &programmable time switches
lLimit switches, Foot switches & precision limit switches
lTerminal contactors, cable ducts & LB Series Switches
lPower Capacitors & APFC Panels
lDistribution System Components like MCB, ELCB etc.
lDrive & Accessories.
lWires & Cables. Please contact our nearest L&T Offices for further details.
SECTION X SECTION X
120 121
NotesNotes
122 123
NotesNotes
NotesNotes
NotesNotes
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Larsen & Toubro Limited
Notes
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