Linde 336 Series, Service Training, Page: 121 / 168

Service Training
Section 2.6
Page 67
2.6.7.2.1 OPERATION OF SPEED SENSOR 2B8
Speed sensor 2B8 is supplied with a d.c. voltage of 15 V by the electronics. When the motor rotates, a
diaphragm moves in front of the sensor. The sensor output signal alternates constantly from 0 V to 15 V as
soon as a segment of the diaphragm is in front of the sensing area of the sensor. In this way the frequency
of the output signal changes with the speed of the motor.
FUNCTIONAL CHECK
Power supply:
- Connect a voltmeter to 2X1:6 and 2X1:8. The supply voltage must be 15 Volt.
Output signal:
- Connect a voltmeter to 2X1:20 and 2X1:6.
- Turn on the key switch.
- Operate the steering. When the pump motor is running, the output signal must be approx. 5 to 7 Volt.
Adjustment:
The speed sensor 2B8 should be mounted 2 mm from the diaphragm.