Vacuum ejector/vacuum unit 71 Features Pressure control has been added to the conventional vacuum release air flow control to prevent the work piece from being blown away. A relief function (function to release excessive pressure) has been incorporated in the vacuum release circuit to shorten vacuum release time. A wide range of vacuum units is available for various needs. (Ejector-correspondence model, Vacuum pump-correspondence model) A manifold model also enables piping to be reduced. The piping direction is selectable from front or back to match the installation site. Three types of supply valves are available double solenoid, normally closed, and normally open. The power-saving double solenoid is suitable for special applications where vacuum must be generated for a long time. LED display with enhanced visibility are used for the vacuum sensor display. Vacuum sensors with 2-point switch output and with analog output are available to match your application. Connector wiring is used to facilitate wiring layout. Standard nozzle diameters are 05, 07, 10 and 12. Vacuum pad Extremely small/light weight work piece *Vacuum release air refers to the air flow for releasing a vacuum. Pressure control added to vacuum release air flow control Compressor Vacuum pad Compressed air Vacuum air Vacuum release air The ejector-correspondence model with a built-in ejector provides a compact vacuum system. Compressor Vacuum pump Vacuum pad Compressed air Vacuum air Vacuum release air Vacuum air Use the vacuum pump-correspondence model when high flow of vacuum air are required or when a vacuum must be generated for a long time. Ejector-correspondencee model Vacuum pump-correspondence model Universal type vacuum unit with release air flow and pressure adjusting needle Vacuum unit VSJ/VSJP series
Transcript
Vacu
umej
ecto
r/vac
uum
unit
71
Features
Pressure control has been added to theconventional vacuum release air flow control toprevent the work piece from being blown away.A relief function (function to release excessivepressure) has been incorporated in the vacuumrelease circuit to shorten vacuum release time.
A wide range of vacuum units is available for various needs. (Ejector-correspondence model,Vacuum pump-correspondence model)
A manifold model also enables piping to be reduced. The piping direction is selectable from frontor back to match the installation site.Three types of supply valves are available double solenoid, normally closed, and normally open.The power-saving double solenoid is suitable for special applications where vacuum must begenerated for a long time.LED display with enhanced visibility are used for the vacuum sensor display. Vacuum sensorswith 2-point switch output and with analog output are available to match your application.Connector wiring is used to facilitate wiring layout.Standard nozzle diameters are 05, 07, 10 and 12.
Vacuum pad
Extremely small/light weight work piece
*Vacuum release air refers to the air flow for releasing a vacuum.
Pressure control added to vacuum release air flow control
Compressor
Vacuum pad
Compressed airVacuum air
Vacuum release air
The ejector-correspondence model with a built-in ejector provides a compact vacuum system.
Compressor
Vacuumpump
Vacuum pad
Compressed air
Vacuum air
Vacuum release air
Vacuum air
Use the vacuum pump-correspondence model when high flow of vacuum air are required or when a vacuum must be generated for a long time.
Ejector-correspondencee model Vacuum pump-correspondence model
Universal type vacuum unit with release air flow and pressure adjusting needle
*V: Vacuum air, PS: Supplied air, PV: Supplied vacuum air
(1) Stopped state (2) At vacuum generation
(1) Stopped state (2) At vacuum generation
(3) Vacuum holding state (4) At vacuum release
(3) Vacuum holding state (4) At vacuum release
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VSJ/VSJP series
Specifications
Type Vacuum ejector unit Vacuum switchover unitWorking fluid Air AirWorking pressure range 0.3 to 0.7MPa 0.3 to 0.7MPaAmbient temperature range 5 to 50 C 5 to 50 CWorking vacuum pressure 0 to -101kPa
))1. The supply pressure above applies at vacuum generation.
2. An abnormal popping may sound at the supply pressure (H type: 0.4 to 0.45 MPa, E type: 0.29 to 0.32 MPa) just before the ultimate
vacuum peaks. This abnormal noise is because characteristics are unstable and increases with instability. This may adversely affect the
sensor. Reset supply pressure.
(Example 1: When the H vacuum ejector operates with a base pressure of 0.5 MPa, an abnormal noise sounds when supply pressure
drops to 0.43 MPa due to a pressure drop. Reset the supply pressure to 0.5 MPa when the vacuum ejector operates.)
3. Select piping and components using a sectional area 3 times larger than the nozzle diameter. Satisfactory vacuum cannot be attained if
a sufficient air flow cannot be ensured.
(Popping occurs at the set pressure if the intake flow is insufficient, the ultimate vacuum cannot be attained, etc.)
(Example 2: An abnormal noise sounds even when using the H vacuum ejector at a working pressure of 0.5 MPa. The air flow is
insufficient. The air flow is restricted preceding the vacuum ejector due to piping resistance, etc., keeping a satisfactory air
flow from being attained. Select piping components that provide the required effective section.)
(Example 3: When using the vacuum ejector with a 1.0 mm nozzle diameter, cross-sectional area is 0.52 xπ=0.785 mm2 x3=2.35 mm2.
Select piping and devices that ensure an effective section of 2.3 mm2 or more.)
Vacu
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79
VSJ series
How to order vacuum ejector unit (Example)
VSJ
(1)
H
(2)
B
(4)
(2) Vacuum characteristics
H: High vacuum medium flow rate type
L: Medium vacuum large flow rate type
E: High vacuum small flow rate type
Z: Manifold type with mixed specifications for each vacuum characteristics (Indicate details in specification sheet.)
(1) Vacuum ejector unit
VSJ: Stand-alone type
VSJM: Manifold type
07
(3)
(3) Nozzle diameter
6
(5)
6
(6)
8
(7)
3
(8)
(4) Valve type
D: Double solenoid type
B: Normally closed type
A: Normally open type
Z: Manifold type with mixed specifications for each valve type (Indicate details in specification sheet.)
(9) (10)
W
(11)
Symbol
05071012
ø0.5ø0.7ø1.0ø1.2
90.493.193.193.1
7132738
11.5234670
66.566.566.5
-
112640-
11.52346-
H type L type E typeUltimatevacuum
-kPa
Suctionflow
/min(A.N.R)
Ultimatevacuum
-kPa
Suctionflow
/min(A.N.R)
Consumedflow
/min(A.N.R)-
90.490.490.4
-10.52127
-173447
Ultimatevacuum
-kPa
Suctionflow
/min(A.N.R)
Consumedflow
/min(A.N.R)
00: Manifold type with mixed nozzle diameter specifications (Indicate details in specification sheet.)
(5) Vacuum port (V)
Symbol 4 6 8Size (mm) ø4 ø6 ø8
CX: Manifold type with mixed joints specifications (Indicate details in specification sheet.)
(6) Air supply port (PS)
Symbol 4 6 8 10Size (mm) ø4(*1) ø6 ø8(*2) ø10(*2)
*1. Only stand-alone type
*2. Only manifold type
(7) Exhaust port (EX)
Atmospheric Common exhaustSilencer Push-in joint
Symbol S 8 10Size (mm) - ø8 ø10(*3)
*3. Only manifold type
*1. When (2) Vacuum characteristics if "Z", only "00" can be selected for (3) Nozzle diameter.When (3) Nozzle diameter is "00", only "Z" can be selected for (2) Vacuum characteristics.
Nozzlediameter
(mm)Consumed
flow/min(A.N.R)
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(11) Vacuum sensor specifications
W: 2-point NPN output with LED display
A: 1-point NPN output + analog output with LED display
Z: Manifold type with mixed specifications for each vacuum sensor (Indicate details in specificationsheet)
No symbol: No vacuum sensor
(8) Solenoid valve voltage
Symbol 3 1Voltage 24V DC 100V AC
(9) Number of manifold stations (Indicate only for manifold type)
Symbol 2 3 4 5 6 7 8 9 10No. of stations 2 3 4 5 6 7 8 9 10*. The number of stations that can be operated simultaneously differs according to
the nozzle diameter and port size combination. Contact CKD Sales for details.
(10) Common piping outlet direction (Indicate only for manifold type)
Symbol A BPiping outlet direction Vacuum port side Supply port side
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VSJP series
How to order vacuum ejector unit (Example)
VSJP
(1)
A
(2)
6
(3)
6
(4) (5)
6
(6)
3
(7)
(2) Valve typeD: Double solenoid type
B: Normally closed type
A: Normally open type
Z: Manifold type with mixed specifications for each valve type (Indicate details in specificationsheet.)
(1) Vacuum switching unitVSJP: Discrete type
VSJPM: Manifold type
(10) Vacuum sensor specificationsW: 2-point NPN output with LED displayA: 1-point NPN output + analog output with LED displayZ: Manifold type with mixed specifications for each vacuum
sensor (Indicate details in specification sheet)No symbol: No vacuum sensor
(8) (9)
W
(10)
(3) Vacuum port (Tube size)
Symbol 4 6 8Size (mm) ø4 ø6 ø8
CX: Manifold type with mixed joints specifications (Indicate details in specification sheet.)
Fix the vacuum ejector VSJ with M3 screws using thefixing holes on the resin body. (Refer to externaldimension drawings for fixing hole pitch.)
Vacuum unit VSJ weight table
Calculate the VSJ weight, using the following formula.Manifold weight = ((1) Discrete VSJ unit + (2) Manifold intermediate block) x No. of stations + (3) Manifold side block + (4)Cartridge x No. used
No. of cartridges used: 2cartridges (PS port)Blank plug is attached tothe PV and EX ports.
Vacuum ejector unit (common exhaust) 112.0
No. of cartridges used: 4cartridges (PS, EX ports)Blank plug is attached tothe PV port.
Vacuum switchover unit 106.0Number of cartridgesused: 6 cartridges
(3) Manifold side block
Weight (g)Type RemarksCJC14-06CJC14-08CJC14-10
11.510.013.0
For ø6 mmFor ø8 mmFor ø10 mm
(4) Cartridge (input, exhaust ports)
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VSJ/VSJP series
Read before using. See pages 3 to 6 in the introduction for Safety Precautions and Precautions common toproducts. See pages 3 to 5 in the introduction for Precautions common to vacuums.
Special precautions
1. Check that leakage current is 1 mA or less when operating the valve. Malfunctions may result from theleakage current and cause problems.
2. Vacuum leaks are tolerated with models with vacuum holding. Provide separate safety precautions if vacuummust be held for a long time.
3. When continuously energizing the pilot valve for a long time, heat generated from the coil could cause burnsor adversely affect peripheral devices. Contact a CKD sales office representative when using energizingcontinuously for a long time.
4. When using a double solenoid (VSJ- A...), the switching valve location is neutral when the pilot air supplyis stopped and then restarted, including when first used after delivery. When restarting the pilot airsupply, issue a signal to the pilot valve or switch the valve manually.
WA
RN
ING
1. Do not apply excessive tension or bending to the pilot valve or vacuum sensor leads. Wires orconnectors may break.
2. When using manifold specifications, the number of manifolds or combination of installed devices mayadversely affect performance or other station vacuum ports. Contact a CKD sales office if you havequestions.
3. Compressed air contains large amounts of drainage (water, oxidized oil, tar, foreign matter, etc.) that mayadversely affect VSJ/VSJP performance. Dehumidify air with an after cooler or dryer and improve air quality.
4. Do not use a lubricator.5. Rust, etc., in piping may result in operation faults. Install a 5 µm or smaller filter preceding the supply port.6. Avoid using this vacuum ejector in environments with corrosive or flammable gas. Do not use this unit for
fluids.7. Do not operate the vacuum break solenoid valve when generating vacuum.8. When replacing the vacuum port's cartridge joint, wipe away all dirt and substance and insert the lock pin
securely.9. When replacing the supply port joint block, check that packing has not dropped off. Wipe away all dirt and
substance and tighten the set screw securely to the specified tightening torque.
CA
UT
ION
Circuit diagram
VSJCommon exhaust with no vacuum sensor
Normally open type Normally closed typeDouble solenoid type
VSJMCommon piping outlet direction: Vacuum port sideWithout vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 14.36 11.7 17.28 21.7 23.0
R
PS PS
R
V V V V V V
øD1; Exhaust port
øD1; Air supply port
øD2; Vacuum port
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
12.512.5
23
25 25
P=2120
4.5 6.1
6.1
L1C1
205
3.5
3610
60.
5
7.555
.5
6
6 56.555
26 34
C2
2926
4614
.6L2
878
Approx.500
10 20.7 16.7
Unit: mmUnit: mm
90
Vacu
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Vacu
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r/vac
uum
unit VSJM
Common exhaust, common piping outlet direction: Supply port sideWithout vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 14.36 11.7 17.28 21.7 23.010 20.7 16.7
R
PS PS
R
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
23
6.1
3946
L136
106
0.5
55.5
C120
53.5
P=2120
6.1 4.5
12.512.5
øD2; Vacuum port
6 56.655
167
6 60.5
C2 L210
1.5
øD1; Exhaust port
øD1; Air supply port
Approx.500
Unit: mmUnit: mm
91
VSJ series
VSJMAtmospheric, common piping outlet direction: Vacuum port sideWithout vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 14.36 11.7 17.28 21.7 23.010 20.7 16.7
PS PS
V V V V V V
øD1; Air supply port
øD2; Vacuum port
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
12.512.5
23
25 25
P=2120
4.5 6.1
6.1
L1C1
205
3.5
106
0.5
7.555
.5
6
6 56.555
26 34
C2
2926
4614
.6L2
878
Approx.500
Unit: mmUnit: mm
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Vacu
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r/vac
uum
unit VSJM
Atmospheric, common piping outlet direction: Supply port sideWithout vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 14.36 11.7 17.28 21.7 23.010 20.7 16.7
PS PS
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
23
6.1
3946
L110
60.
5
55.5
C120
53.5
P=2120
6.1 4.5
12.512.5
øD2; Vacuum port
6 56.655
16
7
6 60.5
C2 L210
1.5
øD1; Air supply port
Approx.500
Unit: mmUnit: mm
93
VSJ series
VSJMCommon exhaust, common piping outlet direction: Vacuum port sideWith vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 5.86 11.7 8.78 21.7 14.510 20.7 16.7
R
PS PS
R
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
øD1; Exhaust port
øD1; Air supply port
øD2; Vacuum port
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
12.512.5
23
25 25
P=2120
4.5 6.1
6.1
L1C1
205
3.5
3610
60.
5
7.5
55.5
6
6 56.5
55
26 34
C2
53.5
50.5 12
.311
.8
4614
.6
L211
1.5
8
6 61
Approx.500
Approx.500
Unit: mmUnit: mm
94
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Vacu
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r/vac
uum
unit VSJM
Common exhaust, common piping outlet direction: Supply port sideWith vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 5.86 11.7 8.78 21.7 14.510 20.7 16.7
R
PS PS
R
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
23
6.1
63.5
46L1
3610
60.
5
55.5
C120
53.5
P=2120
6.1 4.5
12.512.5
øD2; Vacuum port
6 6155
7
6 56.6
6 60.5
C2
L212
6
øD1; Exhaust port
øD1; Air supply port
50.5
11.8
12.3
Approx.500
Approx.500
Unit: mmUnit: mm
95
VSJ series
VSJMAtmospheric, common piping outlet direction: Vacuum port sideWith vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 5.86 11.7 8.78 21.7 14.510 20.7 16.7
PS PS
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME øD1; Air supply port
øD2; Vacuum port
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
12.512.5
23
25 25
P=2120
4.5 6.1
6.1
L1C1
205
3.5
106
0.5
7.555
.5
6
6 56.5
55
26 34
C2
53.5
50.5 12
.311
.8
4614
.6
L211
1.5
8
6 61
Approx.500
Approx.500
Unit: mmUnit: mm
96
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Vacu
umej
ecto
r/vac
uum
unit VSJM
Atmospheric, common piping outlet direction: Supply port sideWith vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 5.86 11.7 8.78 21.7 14.510 20.7 16.7
PS PS
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
23
6.1
63.5
46L1
106
0.5
55.5
C120
53.5
P=2120
6.1 4.5
12.512.5
øD2; Vacuum port
6 6155
7
6 56.6
6 60.5
C2
L212
6
øD1; Air supply port
50.5
11.8
12.3
Approx.500
Approx.500
Unit: mmUnit: mm
97
VSJ series
VSJPMCommon exhaust, common piping outlet direction: Vacuum port sideWithout vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 14.36 11.7 17.28 21.7 23.010 20.7 16.7
PV
PS
RPV
R
PS
V V V V V V
øD1; Exhaust port
øD1; Vacuum supply port
øD1; Air supply port
øD2; Vacuum port
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
12.512.523
25 25
P=2120
4.5 6.1
6.1
L1C1
205
3.5
1818
106
0.5
7.555
.5
6
6 56.555
26 34
C2
1426
4614
.6L2
728
Approx.500
Unit: mmUnit: mm
98
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VSJPM series
VSJPMCommon exhaust, common piping outlet direction: Supply port sideWithout vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 14.36 11.7 17.28 21.7 23.010 20.7 16.7
PV
PS
RPV
R
PS
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
23
6.1
2446
L118
1810
60.
5
55.5
C120
53.5
P=2120
6.1 4.5
12.512.5
øD2; Vacuum port
6 56.655
167
6 60.5
C2 L286
.5
øD1; Exhaust port
øD1; Vacuum supply port
øD1; Air supply port
Approx.500
Unit: mmUnit: mm
VSJP series
99
Vacu
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r/vac
uum
unit
VSJPMCommon exhaust, common piping outlet direction: Vacuum port sideWith vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 5.86 11.7 8.78 21.7 14.510 20.7 16.7
PV
PS
RPV
R
PS
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
kPa
SW
2S
W1
S1
S2
V
MO
DE
ME
øD1; Exhaust port
øD1; Vacuum supply port
øD1; Air supply port
øD2; Vacuum port
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
12.512.5
23
25 25
P=2120
4.5 6.1
6.1
L1C1
205
3.5
1818
106
0.5
7.5
55.5
6
6 56.5
55
26 34
C2
38.535
.5 12.3
11.8
4614
.6
L296
.58
6 61
Approx.500
Approx.500
Unit: mmUnit: mm
100
Vacu
umej
ecto
r/vac
uum
unit
Vacu
umre
late
dco
mpo
nent
sV
acu
um
pad
Inch
/NP
Tsp
ecif
icat
ion
sR
elat
edco
mp
on
ents
VSJPMCommon exhaust, common piping outlet direction: Supply port sideWith vacuum sensor
6
Air supply portTube O.D. D1 C1 L1
14.5 9.18 18.2 13.1
4
Vacuum portTube O.D. D2 C2 L2
10.9 5.86 11.7 8.78 21.7 14.510 20.7 16.7
PV
PS
RPV
R
PS
70 + 21 X n (n = No. of stations)60 + 21 X n (n = No. of stations)50 + 21 X n (n = No. of stations)
23
6.1
48.5
46L1
1818
106
0.5
55.5
C120
53.5
P=2120
6.1 4.5
12.512.5
øD2; Vacuum port
6 6155
7
6 56.6
6 60.5
C2
L211
1
øD1; Exhaust port
øD1; Vacuum supply port
øD1; Air supply port
50.5
11.8
12.3
Approx.500
Approx.500
Unit: mmUnit: mm
VSJP series
101
Vacu
umej
ecto
r/vac
uum
unit
102
Vacu
umej
ecto
r/vac
uum
unit
Vacu
umre
late
dco
mpo
nent
sV
acu
um
pad
Inch
/NP
Tsp
ecif
icat
ion
sR
elat
edco
mp
on
ents
1. Precautions for using the manifold
2. Vacuum sensor
When the number of manifold stations increases, problems such as a drop in vacuum performance due toinsufficient air supply, a drop in vacuum performance due to insufficient exhaust port capacity, or entry ofexhaust into the vacuum port could occur. The number of stations operated simultaneously differs based on thenozzle size and vacuum performance, etc. Contact CKD Sales for details.
1. Setting pressure(1) Energizing (checking wiring and supplying DC power.)(2) Set the display change switch to pressure setting mode (ME S1 or S2, SW).(2) -2. Only for analog output vacuum sensors
Turn the hysteresis setting trimmer (HYS) fully in the CCW direction to set hysteresis to a minimum.(3) Turn the pressure setting trimmer (S1 or S2, SW) with a small screwdriver, setting it to the required
setting.(4) Set the display change switch to ME, apply pressure, and check that the sensor operates appropriately.
(For vacuum sensors with 2-point switch output)Switch output 1 (S1): The operation LED (red) turns on when set pressure is exceeded.Switch output 2 (S2): The operation LED (green) turns on when set pressure is exceeded.(For vacuum sensors with analog output)Switch output (SW): The operation LED (red) turns on when set pressure is exceeded.
2. Setting hysteresis(1) Hysteresis is adjusted using the hysteresis setting trimmer (HYS).(2) Hysteresis is adjusted from 0 to 15% of the setting. Hysteresis increases when the trimmer is turned to CW.(3) Checking hysteresis
Set the display change switch to pressure display mode (ME) and gradually increase and decreasepressure near the set pressure. Read values at which the operation indicator is turned on and off. Thedifference in displayed values is hysteresis.
(4) Example of hysteresis adjustment· If pressure has a pulse and output is thin and intermittent, use large hysteresis.
Precautions(1) Do not use this vacuum sensor in fluids or in an atmosphere with corrosive substances. The sensor may fail.(2) Do not use wiring or applications that may cause noise (surge), etc., to be applied. The sensor may fail.(3) Do not use this vacuum sensor in an atmosphere containing fluids or flammable or explosive gases. This
device is not explosion-proof, so faults may occur.(4) Do not use this vacuum sensor where it may be exposed to water, oil, or dust. This device is not drip-proof,
so faults may occur.(5) Do not use this vacuum sensor for applications that generate heat exceeding the working temperature range.
The sensor may fail.(6) Turn power off before wiring. Check the lead wire color during wiring, and check that the output terminal, power
terminal, and COM terminal are not short-circuited. The sensor may fail if these terminals are short-circuited.
Upper level: Analog output vacuum sensorLower level: Vacuum sensor with 2-point
switch output
Precautions
Vacu
umej
ecto
r/vac
uum
unit
103
VSJ/VSJP series
(7) Do not apply excessive tension or bend the connector cable excessively. Wires or connector section maybreak.
(8) Check that pressure exceeding 0.2 MPa is not constantly applied during a vacuum break. Constantapplication of this pressure may damage the sensor.
(9) When setting pressure or hysteresis, use a small screwdriver, and gently turn the trimmer within itsrotation range. Do not force it. The trimmer or PCB may be damaged if excessive force is applied duringadjustment.
(10) Use stabilized DC power.(11) Insert a surge voltage absorption circuit in the relay or solenoid valve, etc., connected to the output
terminal or power terminal. Avoid uses in which current exceeds 80 mA.(12) Ground the FG terminal when using unit power, such as switching power.(13) Do not short-circuit the output terminal (black or gray lead) with other terminals.(14) Do not apply excessive external impact or force to the sensor.
3. Connection method
3. Adjusting the relief valve
(1) Circuit diagram, structure drawing
Load
Load
Mai
n ci
rcui
t
SW1 OUT (Black)
SW2 OUT (Gray)
COM (Blue)
V+ (Brown)
Load
Mai
n ci
rcui
t
SW1 OUT (Black)
ANALOG OUT (Gray)
COM (Blue)
V+ (Brown)
Vacuum sensor with 2-point switch output Vacuum sensor with analog output
Circuit diagram (VSJ- B normally closed type) Vacuum release unit structure drawing
PS EX
V
Vacuum release air flow rate adjusting needle
Relief mechanism
Stamp indication "F" side
Vacuum release air flow rate adjusting needle
Relief pressure adjusting needle
Stamp indication "R" side
Relief valve
104
Vacu
umej
ecto
r/vac
uum
unit
Vacu
umre
late
dco
mpo
nent
sV
acu
um
pad
Inch
/NP
Tsp
ecif
icat
ion
sR
elat
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mp
on
ents
(2) See the relief needle opening limit in Table 1, and adjust the relief needle to set the relief pressure.
L: (Medium vacuum large flow rate type) E: (High vacuum small flow rate type)
Table 1. Relief needle opening limit
* The needle opening limit for the vacuum pump-correspondence unit (VSJP ) differs based on the performanceof the vacuum pump. Set the needle opening so that the vacuum startup time and vacuum degree are not affected.
*1. Values in Table 1 apply to rated air pressure. The relief needle opening limit differs based on the supplied airpressure, vacuum properties, and vacuum piping (capacity), etc., so use values in Table 1 as references.
(3) After setting the relief needle, confirm that the vacuum properties and vacuum startup time are correct.* If the relief needle opening limit in Table 1 is exceeded, the vacuum startup time could be delayed, or the
correct vacuum degree may not be attained. See "(5) Miscellaneous" below.(4) Set the required vacuum release flow rate with the vacuum release flow rate adjustment needle.
* To shorten the vacuum release time, increase the vacuum air release blow rate.* If the work piece is blown, etc., reduce the vacuum air blow flow rate.
(5) Miscellaneous1) If the relief needle opening is within the range, vacuum startup with 1 in the graph below is attained.2) If the relief needle limit is exceeded, the vacuum startup state with 2 in the graph below is attained and the
vacuum startup time is delayed.3) If the relief needle is further opened, the state with 3 in the graph below is attained, and the correct
vacuum degree is not attained.
Atmospheric pressure
Ultimate vacuum pressure
Valve signal for startingvacuum generation
Vacuum startup time is delayed because of delayed response in relief valve closing.
Relief valve is not closed, so correct vacuum is not attained.
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