Doosan G06030001, Руководство по эксплуатации и техническому обслуживанию

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80 G60, G80, G100, G150, G200-SIIIA OM Manual
ELECTRICAL FAULTS
Checking the winding
You can check the winding insulation by performing a
high voltage test. In this case, you must disconnect all
AVR wires.
CAUTION
Damage caused to the AVR in such conditions is not
covered by our warranty.
FAULT ACTION EFFECT CHECK / CAUSE
No voltage at
no load on
start-up Connect a new battery of 4
to 12 volts to terminals E-
and E+, respecting the
polarity, for 2 to 3 seconds The alternator builds up and its
voltage is still correct when the
battery is removed - Lack of residual magnetism
The alternator builds up but its
voltage does not reach the rated
value when the battery is removed - Check the connection of the
voltage reference to the AVR
- Faulty diodes
- Armature short-circuit
The alternator builds up but its
voltage disappears when the battery
is removed - Faulty AVR
- Field windings open circuit (check
winding)
- Revolving field coil open circuit
(check the resistance)
Voltage too
low Check the drive speed Correct speed Check the AVR connections (AVR
may be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Revolving field coil short-circuited
- Check the resistance
Speed too low Increase the drive speed (do not
touch the AVR voltage pot. (P2)
before running at the correct speed)
Voltage too
high Adjust AVR voltage
potentiometer Adjustment ineffective Faulty AVR
Voltage
oscillations Adjust the AVR stability
potentiometer If no effect: try normal or fast stability
modes (ST2) - Check the speed: possibility of
cyclic irregularity
- Loose connections
- Faulty AVR- Speed too low when
on load (or AVR LAM set too high)
Voltage
correct at no
load and too
low when on
load Run at no load and check
the voltage between E+
and E- on the AVR Voltage between E+ and E- (DC)
SHUNT / AREP / PMG < 10V - Check the speed (or AVR LAM set
too high)
Voltage between E+ and E- SHUNT
/ AREP / PMG > 15V - Faulty rotating diodes
- Short-circuit in the revolving field
coil. Check the resistance.
- Faulty exciter armature. Check the
resistance.
Voltage
disappears
during
operation Check the AVR, the surge
suppressor, the rotating
diodes, and replace any
defective components The voltage does not return to the
rated value - Exciter winding open circuit
- Faulty exciter armature
- Faulty AVR
- Revolving field coil open circuit or
short-circuited