mastervolt genset

[marcot]

the mastervolt genset (whisper 6 ultra 1500rpm) starts but after a few seconds stops.

the digital display shows "AC1 voltage " which according to the manual is "Generator AC output voltage is out of range (phase 1, 2 or 3)
(<100V or > 125V / <205V or >253V, depending on the nominal output voltage."

what can I do?

marcot

 

[david_bagshaw]

the mastervolt genset (whisper 6 ultra 1500rpm) starts but after a few seconds stops.




what can I do?

marcot

any method of finding out what the voltage is?, do you have a volt meter in any panel you can watch as it starts? does it behave in the normal way?

most likely voltage will be too low or zero, if it is a set that uses large capacitors in its field control/ excitation. these are usually a weak spot.

Just lookeed on mastervolt and :-Voltage regulation capacitor + AVR optional

so if no output voltage on start, have the excitation capacitor tested.

Also, check you are not starting with a connected load, as that can cause a zero output.

take a look at page 26 of the manual downloadable from below

http://www.mastervolt.us/marine/pro...6-ultra-57-kw-230v-50hz-1500-rpm-wet-exhaust/http://www.mastervolt.us/marine/products/1500-1800-rpm-wet-exhaust/whisper-6-ultra-57-kw-230v-50hz-1500-rpm-wet-exhaust/

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 by charging the capacitor
("flashing") independently with a small 9 Volt battery. This
can be done while the engine is stationary and the wiring
is connected.
If the generating 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
capacitor(s) should be renewed. When this does not help,
the rotating rectifier diodes should be tested and a winding
resistant test should be executed.
5.3.2 Testing rotary rectifier diodes
The diodes 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
disconnected 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