TOYAMA TDMG25 Guia Del Propietario página 34

polarities causes reverse of magnetic
field.
3、Exciter stator is rewind.
4、Mechanical shock.
The insulation of exciter stator is poor. Test the insulation of exciter stator windings.
The insulation of main stator is poor.
Short circuit of varistor on rotating
rectifier
Short circuit of dioeds on rotating
rectifier
Windings fault. Open circuit or short
circuit of any winding.
AVR fault
Load is applied to the engine during
start up of engine.
No power supply from main stator to
AVR
Low engine speed
Under frequency protection (UFRO)
circuit activated.
AVR volt control, or external hand
trimmer are incorrectly set.
Low voltage
(no load)
Panel voltmeter is faulty or sticking.
AVR fault
Connections are loose, broken or
corroded.
No power supply from main stator to
AVR
Voltage sensing input to AVR is open
circuit or too low.
AVR volt control, or external hand
High
trimmer are incorrectly set.
voltage
（no load）
Fault of sensing supply
Test the insulation of main stator windings.
Test varistor.
Test diodes.
Test windings.
Replace AVR and re-test.
The voltage may not build up before the load
is disconnected from the engine. Open circuit
breaker and re-test.
Test the AVR sensing supply feedback.
Test speed with tachometer. Adjust governor
control to nominal speed.
Inspect UFRO led at AVR. If it is lit, UFRO is
activated, indicating low speed. Adjust engine
speed, to within -1% to +4% of nominal.
1、 Test engine speed with tachometer whether
it is correct. And conform whether the UFRO
is OFF.
2、Adjust voltage by AVR volts control, or
remote trimmer.
Test voltage at generator terminals with a
multimeter.
Replace AVR and re-test.
Inspect the wiring for poor connections.
Repair or replace where necessary.
Test the AVR sensing supply feedback.
Test the AVR sensing supply feedback.
1、 Test engine speed with tachometer whether
it is correct. And conform whether the UFRO
is OFF.
2、Adjust voltage by AVR volts control, or
remote trimmer.
circuit Test the AVR sensing supply feedback.
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