4 - 42 ELECTRONICS WX210 - WX240

PCS 40000499-en

Fig. 8

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WX210 - WX240 ELECTRONICS 4 - 43

PCS COMPONENTS 40000471-en

Load-limit regulator

Fig. 1

Fig. 2

Legend

1 Power supply

2 PWM1 output, proportional valve Y10

3 PWM2 output, proportional valve Y207b

4 PWM3 output, proportional valve Y207a

5 Input from B13.1, coolant temperature

6 Input from R10.3, charge-air tempera-ture

7 Input from R14, hydraulic oil tempera-ture

8

9

10

11

12

13

14

15

16

17

18 Output, fan control Y131

19

20

21 CAN1 High to CU A100

22 CAN1 Low to CU A100

23

24 Input from sensor B10.1

25 Ground, cable cross-section 2.5 mm²

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4 - 44 ELECTRONICS WX210 - WX240

Speed actuator M10

Fig. 3

Fig. 4

Pin assignment:

PIN 1 motor

PIN 2 potentiometer

PIN 3 potentiometer/back check

PIN 4 potentiometer

PIN 5 motor

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WX210 - WX240 ELECTRONICS 4 - 45

Decription

Fig. 5

Fitting instructions:

Installation of speed actuator M10 with link-age: - The dimensions specified must be observed

during fitting

- Carry out calibration after fitting.

The speed actuator converts the speed stages preselected at key-board module C5.1 into diesel engine speeds.

The PWM signals from the CU set the actuator lever to different positions. This lever actuates the injection pump lever via a linkage.

See also circuit diagram 8900298 sheet 10, speed actuator, at the end of this section.

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4 - 46 ELECTRONICS WX210 - WX240

Speed sensing Speed sensor B10.1:

Fig. 6

Description When the diesel engine is running, the load-limit regulator A10 receives permanently a frequency signal from the speed sensor (inductive pickup) B10.1.

The inductive pickup is screwed into the fly-wheel housing of the engine opposite the toothing.

The frequency signal is derived from the alterna-tion between tooth and spacewidth in the induc-tion field of the sensor.

The speed signal is used by the load-limit regula-tor to determine the load condition of the diesel engine.

Speed sensor (pickup) B10.1

Fig. 7

FITTING INSTRUCTION

The sensor must be screwed completely down into the fly-wheel with the connector unplugged.

The sensor must then be turned back by ½ turn and secured with the hex locknut size 24.

Technical characteristics:

Thread ¾“ 16 UNF

Coil resistance at 20°C = 450 Ω+/-20 Ω

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WX210 - WX240 ELECTRONICS 4 - 47

Coolant temperature sensing

Fig. 8

Description For coolant temperature monitoring, temperature sensor B13.1 is screwed into the cylinder head of the engine.

The sensor is an NTC resistor reducing its electri-cal resistance with increasing temperature.

FITTING INSTRUCTION:

Tightening torque 20 to 30 Nm

Technical characteristics:

Thread ½“ x 14 PTF

Table: Resistance = f (temperature)

t (°C) Resistance (Ω)

0 5466 – 5896

10 3542 – 3792

20 2351 – 2500

25 1941 – 2057

30 1615 – 1707

40 1118 – 1175

50 798 – 834

60 573 – 596

70 421 – 435

80 313 – 323

90 237 – 243

100 182 – 186

110 140 – 144

120 109 – 113

Temperature sensor B13.1

Fig. 9

PIN A Grid heater controller

PIN B Load-limit regulator

PIN C Ground

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Charge-air temperature sensing

Fig. 10

Description Temperature sensor R10.3 senses the charge-air temperature at the radiator outlet or at the mani-fold inlet.

The sensor is an NTC resistor reducing its electri-cal resistance with rising temperature.

FITTING INSTRUCTION:

Tightening torque 20 Nm

Technical characteristics:

Thread M14x1.5

Table: Resistance = f (temperature)

t (°C) Resistance

0 2700 – 3300

10 1600 – 2000

20 1000 – 1280

25 890 – 970

30 650 – 800

40 430 – 530

50 290 – 350

60 200 – 240

70 140 – 170

80 100 – 120

90 77 – 90

100 58 – 67

110 44 – 50

120 35 – 39

Temperature sensor R10.3

Fig. 11

PIN1 Load-limit regulator

PIN2 Ground

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WX210 - WX240 ELECTRONICS 4 - 49

Hydraulic oil temperature sensing

Fig. 12

Description To determine the hydraulic oil temperature, tem-perature sensor R14 is provided.

The sensor is installed at the hydraulic reservoir besides the suction line for the main pumps.

The sensor is an NTC resistor reducing its electri-cal resistance with rising temperature.

FITTING INSTRUCTION:

Tightening torque 20 Nm

Technical characteristics:

Thread M14x1.5

Table: Resistance = f (temperature)

t (°C) Resistance

20 1038 – 1268

30 701 – 839

40 450 – 540

50 331 – 389

60 214 – 250

70 166 – 194

80 116 – 134

90 80 – 92

100 60 – 68

Temperature sensor R14

Fig. 13

PIN1 Load-limit regulator

PIN2 Ground

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Proportional valve Y10

Fig. 14

Description The proportional valve converts the control current transmitted by load-limit regulator A10 into control pressure.

The control pressure is admitted via port X3 to both pump regulators of the main pumps A 8 V.

Proportional valve Y10 is installed in the pilot con-trol unit where the pilot pressure is available at the control piston of the proportional valve.

Emergency operation The proportional valve is equipped with an emer-gency operation device.

In the event of a PCS fault and an resulting en-gine speed reduction, the absorbed power of the main pumps A 8 V can be reduced to such an extent that the diesel engine is no longer signifi-cantly throttled during the work.

Withdraw the connector from the proportional valve.

Turn hex-screw in by abt. 2 turns after loosening the locknut.

Let the engine run at maximum speed and load by moving the stick cylinder against block and by maintaining it there with an additional slewing motion of the superstructure of more than ½ turn.

Observe the engine speed during the process:

If the engine is still throttled, turn hex-screw fur-ther down.

If the engine maintains its speed under load and if the machine moves only slowly, the hex -screw has been turned into far.

The emergency operation is properly adjusted if the machine can be used for working without con-siderable engine throttling.

When the emergency operation function is activated, temperature monitoring is not operational.

Technical characteristics, electrical:

- PWM frequency: 150 Hz

- Coil resistance at 20°C: 18 Ω ± 0,2 Ω

- Max. coil current: 850 mA

- Characteristics: 100 mA → 0 bar (+ 0.5 tolerance) 800 mA → 40.5 bar (+ 2.0/ -0.5 tolerance)

Characteristic curve of proportional valve Y10, control pressure as a function of control current:

Fig. 15

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