Specifications

Service Training
Section 4.9
Page 52
12.05
- Voltage measurement between connections X/B2:2 and X/B1:2. (Voltage value of the basic setting). The
plugs remain connected. Insert the measuring prods at the indicated measuring points. For this purpose,
the rubber bush must be removed from plug X/B1.
Meter shows voltage of 750 ± 10 mV.
- Start engine.
- Press an accelerator pedal fully down until the end stop. The voltage on the meter must likewise steadily
rise from 750 ± 10 mV to 2 V.
NOTE: If the four measurement values are not obtained, the basic setting of the target value
transmitter B2, the cable connections, the supply voltage and the midpoint voltage must be
checked or the speed regulator N2 or target value indicator B2 must be replaced.
ACTUAL VALUE TRANSMITTER
- Disconnect plug X/B1.
- Attach test cable of a meter on the connections X/B1:2 and X/B1:1 and take a resistance measurement.
Target value: 1 kΩ ± 100 Ω
- Switch meter to a.c. voltage and to set to 100 V measuring range.
- Disconnect speed regulator N2.
- Turn engine with starter motor and read off voltage on meter.
Target value: 5 - 15 V
- Connect tachometer.
- Manually draw out operating magnet axis by about 1/3 and start engine. Set an engine speed of about
750 rpm by manual activation of the operating magnet axis and read off voltage on meter.
Target value: 20 - 40 V
- Now let engine speed rise to 2100 rpm by manual activation of the magnet axis and read off voltage on
meter.
Target value: 50 - 100 V
NOTE: The voltage values listed here vary within the tolerances mentioned, depending on the setting
of the actual value transmitter, and may diverge still further, depending on the meters used.
The testing serves only to determine whether the voltage value, i.e. the output signal, varies
with variations in engine speed.