Alternator Installation and Maintenance
Operation & Maintenance Manual
22637300
91
Electrical Faults
Fault
Action
Symptoms
Cause
No voltage at no load or
startup
Connect a battery of 4 to
12 volts to terminals E+ or
E- respecting the polarity
on the A.V.R. for 2 to 3
seconds
- The alternator builds up
and voltage is correct
when the battery is
removed.
- Lack of residual magnetism
The alternator builds up
but voltage does not
reach nominal value when
the battery is removed.
- Check the connections of the
sending leads to the A.V.R.
- Faulty rotating diode
- Short-circuit on rotor windings
The alternator builds up
but voltage collapses
when the battery is
removed.
- Faulty A.V.R.
- Exciter field short-circuited or
open circuit (check windings)
- Main field winding open circuit
(check resistance).
Voltage too low
Check the prime mover
speed
Correct speed
- Check A.V.R. connections
(possible AVR failure)
- Exciter field short-circuited
- Rotating diode(s) burnt out.
- Main field rotor short-circuited
- Check the resistance.
Speed too low
Increase the speed of primer
mover. (Do not touch the AVR
voltage pot. (P2) before running
at the correct speed).
Voltage too high
Adjust potentiometer
voltage
No adjustment of voltage,
measure voltage E+/E- on
AVR
Voltage between E+ and E- >
12V or AVR faulty
Voltage oscillations
Adjust the stability
potentiometer on A.V.R
If no effect: change
recovery mode normal/
rapid (ST2)
R438 or R448 only
Check speed for possible cyclic
irregularity
Loose connections
Faulty A.V.R
Speed below nominal on load
(or LAM set too high)
Voltage correct on no load
too low on load (*)
Run on no-load and check
voltage between E+ and
E-
Voltage between E+ and
E- <6V (DC)
Voltage between E+ and
E- >10V (DC)
Check speed (or LAM on R438
set too high)
Faulty rotating diodes faulty
Short circuit in the main field.
Check resistance.
Faulty exciter armature. Check
resistance.
Voltage collapses during
normal operation (**)
Check the AVR, the surge
suppressor, the rotating
diodes and replace any
defective part
The output voltage does
not return the rated value
Exciter winding open circuit
Faulty exciter armature
Faulty AVR
Main field rotor winding open
circuit or short circuit
Содержание G10WMI-2D-T2
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