USA / WHISPER 15 ULTRA / May 2004
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5.2.3 Warnings
Generator must be shut off immediately if:
• Motor RPM suddenly rises or drops.
• Unusual noise comes from generating set.
• Exhaust gases suddenly colour dark.
• Engine failure warning light is on
5.2.4
Service address
If you cannot correct a problem with the aid of the mal-
function table, contact your Mastervolt Service Centre or
Mastervolt Amsterdam for an extended service list, tel:
INT +31-20-3422100. www.mastervolt.com
5.3 SPECIAL PROCEDURES
ALTERNATOR
5.3.1 Residual voltage check / excitation procedure
When residual magnetism disappears there is no resi-
dual voltage. Residual magnetism can disappear after
the generating set being a long period out of service or a
short circuit. This can be solved by charging the capa-
citor ("flashing") independently by a small 9 Volt battery.
This can be done while the engine is stationary and the
wiring is connected.
If the starter set battery is used for flashing
one must take care. A short circuit can
cause heavy sparking, fire and injuries.
When flashing does not bring back voltage, the capaci-
tor(s) should be renewed. When this does not help, the
rotating rectifier diode should be tested and a winding re-
sistant test should be executed.
5.3.2 Testing rotary rectifier diode
The diode in the rotor can be checked with a multimeter.
When the diode is faulty, the alternator will not generate
any voltage.
The flexible lead connected to the diode should be dis-
connected at the terminal end, and the forward and
reverse resistance checked. A healthy diode will indicate
a very high resistance (infinity) in the reverse direction,
Loss of power
• Wrong measurement. Check if the load is measured correctly. Does the Amp meter show the
correct value? When calculating the load by multiplying voltage and amps this should be done
by using the exact values, taking into account the power factor of the consumers. When any
doubt measure the power directly with an appropriate instrument.
• Overfull oil sump.
Bring the oil to the correct level.
• Choked full filter.
Replace the fuel filter.
• Choked air filter.
Check air inlet openings; clean air filter.
• Exhaust blocked.
Check the exhaust system.
• Injector blocked.
Have the injectors checked.
• Loss of compression, sticking or
Have the compression measured.
damaged piston rings.
Clean or replace the rings.
• Wear out of cylinders.
Have the compression measured and have the
engine overhauled.
Over-temperature
• Overload.
Take away the overload.
• Low level of cooling oil or
Fill up with liquid and release air bubbles.
• air in the cooling system.
Check if there are air blocks in the system; refer
to the installation manual.
• Water inlet system blocked.
Check the cooling system thoroughly
• Broken impeller.
• Water strainer choked.
• Heat exchanger choked.
• Broken or slipping V-belt.
Replace and adjust the V-belt tension.
• Faulty thermostat.
Check the thermostat or replace.
F
9V
Fig. 16.
DIODE
Fig. 17.
TROUBLE SHOOTING
