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Doosan 7/72 - Page 57

Doosan 7/72
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53
7/72
FAULT FINDING
F AULT CAUSE REMEDY
No output. Load plugs not fitted into socket
outlets correctly.
Ensure that the load plugs are fitted correctly into the socket outlets.
No output.
Loose connection. Remove end cover and terminal box lid and check for loose connections.
Rectify the fault as necessary.
Faulty rectifier. Check the rectifier bridge which is located inside the rear housing.
Faulty capacitor. Check the capacitors.
The No load voltage is low but
increases when a load is applied.
Check the capacitors and associated wiring.
The No load voltage falls when a
load is applied.
Check the capacitors and associated wiring.
Loss of residual magnetic field Refer to Mecc Alte maintenance manual
No output. Output winding(s) damaged. Measure the voltage across the winding(s). Replace the generator if
damaged.
Field winding damaged. Replace the generator.
Generator fails to provide
maximum output.
Engine is not running at full speed. Check the engine speed with a tachometer. Consult the company if the engine
is found to be running slow (Refer to section 4 General Information).
Drive belt is not tensioned
correctly.
Re--tension the drive belt.
Drive pulley is loose on the drive
shaft.
Check the drive pulley and tighten as required.
The output voltage
collapses when a load is
connected.
Overload condition. Check and reset each circuit breaker. If the condition persists then investigate
the cause and rectify the fault as necessary. (see also Circuit breaker trips’)
Short circuit. Check for a short circuit and rectify the fault as necessary.
Incorrect wiring. Check the wiring and rectify the fault as necessary.
Circuit breaker trips. Overload condition. Check and reset each circuit breaker. If the condition persists then investigate
the cause and rectify the fault as necessary. (see also Circuit breaker trips’)
Short circuit. Check for a short circuit and rectify the fault as necessary.
Fault in appliance. Check the appliance and rectify the fault as necessary.
A circuit breaker fails to
re--set whilst the machine
running.
Circuit breaker latching
mechanism faulty.
Repair or replace as necessary.
Refer to Engine Manufacturer’s manual and Mecc Alte manufacturer’s manual

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