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ENGLISH
ENGLISH
M
40.2.1
TROUBLESHOOTING
REV
.3-07/06
GENERATOR
Absence of output voltage
1) Protection tripped due to overload
2) Differential protection device tripped
3) Protection devices defective
4) Alternator not exited
6) Faulty AVR
7) AVR fuse faulty
1) Check the load connected and decrease
2) Check the insulation of the whole system: wiring,
connections, connected load and check that there are
no insulation fault that cause leakage currents to earth
3) Replace
4) Carry out external excitation test as indicated in
alternator manual. Ask for intervention of Service
Department
6) Replace
7) Replace
No-load output voltage too low or
too high
1) Incorrect engine running speed
2) Alternator fault
3) AVR with setting wrong or fault
1) Regulate speed to its nominal no-load value
2) Check winding, diodes, etc. on alternator (See to
alternator manual). Repair or replace. A s k f o r
intervention of Service Department.
3) Adjust the Volt trimmer of AVR or replace
Corrected no-load voltage too low
with load
1) Incorrect engine running speed due to overload
2) Load with cos
ϕ
less than the nominal one
3) Alternator fault
4) Faulty AVR
1) Check the load connected and decrease
2) Reduce or rephase load
3) Check winding, diodes, etc. on alternator (See to alter
-
nator manual). Repair or replace. Ask for intervention
of Service Department.
4) Replace
Unstable tension
1) Contacts malfunctioning
2) irregular engine revolution
3) Alternator fault
1) Check electrical connections and tighten
2) Ask for intervention of Service Department
3) Check winding, diodes, etc. on alternator (See to
alternator manual). Repair or replace.
Ask for intervention of Service Department.
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