Troubleshooting
M
40.2.
1
© MOSA
1.1-09/05
12/06/03 M40GB_1500G_GE
GE
Diesel engine
Problem
Possible cause
Solution
4) Water radiator or oil clogged (where it
is assembled)
5) Water circulating pump defective (Only
for water cooled motors)
6) Injectors defective. Injection pump
requires calibration
7) Alarm malfunction
4) Clean cooling fins on radiator
5) Ask for intervention of Service
Department
6) Ask for intervention of Service
Department
7) Check the sensor and electrical
circuit
Absence of output voltage
1) Protection tripped due to overload
2) Differential protection device tripped.
(Differential switch, differential relay)
3) Protection devices defective
4) Alternator not sparked
5) Alternator defective
1) Check the load connected and
diminish
2) Check on the entire installation:
cables, connections, utilities
connected have no defective
sheathing which may cause incorrect
currents to ground
3) Replace
4) Carry out external spark test as
indicated in alternator manual. Ask
for intervention of Service
Department
5) Check winding, diodes, etc. on
alternator (Refer to alternator
manual)
Repair or replace.
Ask for intervention of Service
Department
No-load voltage too low or
too high
1) Incorrect motor running speed
2) Voltage regulating device (where it is
assembled) defective or requires
calibration
3) Alternator defective
1) Regulate speed to its nominal no-
load value
2) Adjust regulator device as indicated
in alternator manual, or replace
3) Check winding, diodes, etc. on
alternator (Refer to alternator
manual)
Repair or replace
Ask for intervention of Service
Department
Corrected no-load voltage
too low with load
1) Check the load connected and
diminish
2) Reduce or rephase load
3) Check winding, diodes, etc. on
alternator (Refer to alternator
manual)
Repair or replace
Ask for intervention of Service
Department
1) Check electrical connections and
tighten
2) Ask for intervention of Service
Department
3) Check winding, diodes, etc. on
alternator (Refer to alternator
manual)
Repair or replace
Ask for intervention of Service
Department
1) Incorrect motor running speed due to
overload
2) Load with cos
ϕ
less than 0.8
3) Alternator defective
1) Contacts malfunctioning
2) Irregular rotation of motor
3) Alternator defective
Unstable tension
