POWER DRIVE SYSTEMS
DUNLITE UVR100 AUTOMATIC VOLTAGE REGULATOR
9
FAULT LOCATION
If the generating set runs at the correct speed, but will not generate, check as follows -
1. Shut down the set.
2. Check all wiring between the alternator, distribution board and load.
3. Check the external potentiometer terminals PP are bridged. If an external
potentiometer is being used, check it and its connecting leads for continuity.
Check droop terminals DI, D2 are bridged if not in use.
4. Isolate the main stator windings and exciter field windings and check
for continuity and the insulation resistance to earth and between the windings.
(Contact Dunlite for specific ohmic values, stating alternator serial number.)
Note Before testing insulation resistance with any high voltage test equipment, make certain
the main alternator voltage regulator and the battery charging voltage regulator leads are
disconnected and insulated to prevent damage to solid state components.
5. Disconnect the exciter field leads from the regulator F+ and F-, carefully noting the
respective lead/terminal positions (grey lead to F+, white lead to F-).
Connect the white lead to the negative of the starter battery. Place a 0-5 amp DC ammeter in
series with the grey lead, and connect to the lowest battery tap.
Start up the alternator and note alternator output voltage. Increase the tapping voltage until the
alternator voltage is approximately 240 voltage.
Note Do not connect any voltage from any source to these leads whilst they are
connected to the regulator, or permanent damage to the regulator may occur.
Check the current with the 0-5 ammeter, and if this is in excess of the factory
recommended limit of the alternator, the fault probably lies within the alternator.
The fault could have caused the regulator to fail, hence regulator fault finding procedure must be
carried out.
REPOLARISATION
It is posible, after prolonged periods of storage, or as a result of certain fault conditions, that the alternator
will not have sufficient residual magnetic field for initial excitation. In such circumstances, the following
procedure will re-establish the residual field -
1. Shut down the set.
2. Disconnect the exciter field leads from the regulator (Field Supply positive and negative) carefully
noting the respective lead/terminal positions.
3. Momentarily, connect the leads from the exciter field across the starter battery with the lead from
the positive terminal being taken to the positive battery terminal and the lead from the negative
terminal to the negative battery terminal .
(The starter battery may be either 12 or 24 volt.)
Take care not to connect the starter battery to these leads whilst they are connected to the
regulator, or, permanent damage to the regulator may occur.
4. Reconnect the exciter field leads to the regulator.
If the alternator still fails to excite, the fault may be in the regulator.
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