EN / WHISPER 6 /12 Mobile / November 2004
29
• Radiator choked by dirt.
Check and refer to installation manual.
• Hot air circulation in radiator
• Broken or slipping V-belt.
Replace and adjust the V-belt tension.
• Faulty thermostat.
Check the thermostat or replace.
TROUBLE SHOOTING
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 residual
voltage. Residual magnetism can disappear after the
generating set being out of service for a long period or a
short circuit. This can be solved with 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 discon-
nected 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, and a low
resistance in the forward direction. A faulty diode will give
a full deflection reading in both directions with the test
meter on the 10,000 ohms scale, or an infinity reading in
both directions. Replace the diode.
5.3.3 Winding resistant values
If after establishing and correcting any fault on the
capacitor and diodes output is still low when separately
excited, then the main rotor, stator and exciter stator
winding resistance should be checked as the fault must
be in one of these windings. The respective leads must be
disconnected before taking the readings.
Resistance values should be within 10% of the values
given in the table below:
F
9V
Fig. 18.
DIODE
Fig. 19.
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