4-42 ELECTRONICS WX210 - WX240 PCS 40000499-en Fig. 8
WX210 - WX240 ELECTRONICS 4-43 PCS COMPONENTS 40000471-en Load-limit regulator Legend Fig. 1 Fig. 2 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 temperature 7 Input from R14, hydraulic oil temperature 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
4-44 ELECTRONICS WX210 - WX240 Speed actuator M10 Fig. 3 Pin assignment: PIN 1 motor PIN 2 potentiometer PIN 3 potentiometer/back check PIN 4 potentiometer PIN 5 motor Fig. 4
WX210 - WX240 ELECTRONICS 4-45 Decription 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. Fig. 5 Fitting instructions: Installation of speed actuator M10 with linkage: - The dimensions specified must be observed during fitting - Carry out calibration after fitting.
4-46 ELECTRONICS WX210 - WX240 Speed sensing Speed sensor B10.1: Speed sensor (pickup) B10.1 Fig. 6 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 alternation between tooth and spacewidth in the induction field of the sensor. The speed signal is used by the load-limit regulator to determine the load condition of the diesel engine. 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
WX210 - WX240 ELECTRONICS 4-47 Coolant temperature sensing Temperature sensor B13.1 Fig. 8 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 electrical 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 Fig. 9 PIN A Grid heater controller PIN B Load-limit regulator PIN C Ground
4-48 ELECTRONICS WX210 - WX240 Charge-air temperature sensing Temperature sensor R10.3 Fig. 10 Temperature sensor R10.3 senses the charge-air temperature at the radiator outlet or at the manifold inlet. The sensor is an NTC resistor reducing its electrical 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 Fig. 11 PIN1 PIN2 Load-limit regulator Ground
WX210 - WX240 ELECTRONICS 4-49 Hydraulic oil temperature sensing Temperature sensor R14 Fig. 12 To determine the hydraulic oil temperature, temperature 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 electrical 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 Fig. 13 PIN1 PIN2 Load-limit regulator Ground
4-50 ELECTRONICS WX210 - WX240 Proportional valve Y10 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) Fig. 14 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 control unit where the pilot pressure is available at the control piston of the proportional valve. Emergency operation The proportional valve is equipped with an emergency operation device. In the event of a PCS fault and an resulting engine 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 significantly 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 further 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 considerable engine throttling. Characteristic curve of proportional valve Y10, control pressure as a function of control current: Fig. 15