26
July 2004 / WHISPER 16 ULTRA Mobile / EN
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,
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:
Resistance Whisper 16 ULTRA
50Hz-230V
• Resistance both main stator windings
0.18 Ohm
in series
• Resistance both rotor windings
3,90 Ohm
• Resistance exciter stator winding
0.42 Ohm
5.3.4 Meggering
One can try to measure resistance between the housing and
the windings by a multimeter which should read infinitely.
When readings indicate infinity but a fault is suspected
one can do a high voltage resistance test (MEGGERING)
This procedure should be carried out by an expert
10 mm
Fig. 16.
DIODE
Fig. 17.
TROUBLE SHOOTING
• 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.
• Broken impeller.
Clean radiator.
• 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.
