Troubleshooting Chart - Leroy-Somer Nidec R180 Installation And Maintenance Manual

Electric Power Generation

6 - TROUBLESHOOTING CHART

Symptom
No voltage
build-up
Voltage too high
Low voltage
Incorrect
regulation
Voltage unstable
Voltage builds-up
but collapses/
erratic behaviour
Installation and maintenance
Cause
Fuse links blown
Low residual voltage across
X1 and X2 terminals
Incorrect wiring
Voltmeter defective
Faulty AVR
Incorrect voltage setting
Faulty AVR
External potentiometer link
open
Loss of sensing voltage
Prime mover rpm falls
Prime mover rpm falls
Highly distorted non-linear
load
Alternator running on very low
P.F.
Unbalanced load
Faulty AVR
Rotating diodes failed
Droop connected
Incorrect wiring
Stability setting incorrect
Incorrect wiring
Incorrect circuit board settings Set as per instructions in the manual
R180
AVR
Change the fuse links
Run alternator at correct rpm. If the problem
persists, disconnect the AVR and connect a
24VDC battery between F1 and F2. This action
will increase the residual voltage.
Reconnect AVR.
Check the wiring complies with the wiring diagram
and repair if necessary
Replace the voltmeter
Replace the AVR
Set the voltage to the required value
Replace the AVR
Connect link or potentiometer as necessary
Connect as per the diagram
Set rpm
Set rpm
Reduce non-linear load
P.F. correction required
Redistribute the load equally over all three phases
Replace the AVR
Replace the diodes
Remove droop connection if not needed
Check and repair the wiring. Make sure that the
contacts are screwed in tightly.
Adjust the stability potentiometer
Check and repair the wiring. Make sure that the
contacts are screwed in tightly.
5599 en - 2020.07 / f
Action
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