RPM Switch
Inspection / Adjust
A5.05. 11.05.01.02
7500
M20/M25/M32/M43
en / 26.11.2010 IB021724 1/2
11
See also: C5.05.05.70.06.43
Spare parts list:
Time requirement: 1 Pers./ 1,00 h
Personnel qualification: E-specialist
--------------------------------------------------------------------------------------------------------------------------------
Operating medium: Heavy fuel and distillate fuel
Inspection:
Check the function of the rpm switches every 7,500 operating hours.
Sequence of operations:
1. Note the rpm switch point setting. Loosen
the pointer locking plate (2) and set the
pointer (1) at the highest engine speed.
The output relay on the plug-in card must
switch and the luminous diode (3) on the
dial will go out (Fig. 1).
2. Turn the pointer carefully to the left
towards 0 rpm. When reaching the engine
speed, the output relay will switch and the
diode on the dial must light up (switch
hysteresis ± 25 rpm).
3. Set the pointer again at the original rpm
switch point and lock it.
If the rpm switch does not work, proceed
as follows in order to locate the defect:
4. The automatic cut-out F 1.1 and F 2.1 on the plug-in card A1 in the rpm switch installation must
be switched on.
At constant speed and with the setting as under point 1, continue as follows:
5. Voltage check at the plug-in socket contacts of the plug-in frame.
NOTE
The engine speed must be constant whilst testing.
To Next Page