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36 M-SQ PRO 15/18 kVA Marine Diesel Generator
5 TROUBLESHOOTING
5.1 Alternator/ electrical faults
CAUTION
Remove 3 Amp. Fuse in the control panel while working
on the generator to prevent the engine to start.
DANGER!
Take care for parts which are live!
5.1.1 General
If any problem should occur, check basic conditions and examine
all external wiring, switch gear and circuit breakers. Also check
if measuring instruments give the correct value. If in doubt,
measure directly on the alternator terminals with an indepen-
dent instrument. This should only be carried out by an expe-
rienced electrician. If during these measurements the engine
immediately stops after starting and an error code is displayed
at the remote control panel ( “AC VOLTAGE”), one can start the
generator by means of a “service start” at the service menu (see
paragraph “service start” of the user’s manual of the Digital Die-
sel Control). By doing this, the generator will keep running for 2
minutes before it stops. This offers you the possibility to carry out
measurements to investigate the cause of the failure.
Check if the engine is running correctly at 1500 RPM (50 Hz) ac-
cording to its settings and does as well under load. A RPM drop of
3% at full load is acceptable. Therefore a no load setting should
be at 1545 RPM = 51.5 Hz. Under no circumstances should the
RPM under full load be below 1485 RPM = 49.5 Hz.
When the problem is in the RPM refer to the engine fault finding
paragraph.
Digital Diesel Control system will help to indicate failures and
display causes.
CAUTION
If the voltage is set any higher than its maximum limit,
the generator may be damaged.
If the bottom speed is set at too low a frequency, the genera-
tor may be damaged. On the other hand too high a frequen-
cy can cause voltage drops with high loads.
A failure code is displayed when a hardware failure at the generator is detected.
Failure code Problem
COMMUNICATION
Communication error between the panel and the generator
LOW START BAT Starter battery voltage too low
ALTERNATOR No output battery charging voltage
EXHAUST TEMP
Exhaust temperature is too high
WATER TEMP
Coolant temperature is too high
OIL PRESSURE
Oil pressure failure
LOW VOLTAGE
Generator AC output voltage is too low
HIGH CURRENT
Generator is in overload
FREQUENCY
Output frequency of the generator is too low
ECU FAILURE When red light, fig 24 is blincking→see table pag. 37 (SQ-Pro 18 only)
Fig 24 ECU red light