DATAKOM DKG-705 User’s Manual
705_USER.doc
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19. TROUBLESHOOTING
The genset starts to operate while AC mains are OK or faulty voltage or frequency measurements:
Check engine body grounding.
AC mains voltages may be outside programmed limits.
Mains frequency may be outside limits.
Check the AC voltage readings by pressing the MENU button.
Check the mains frequency reading by pressing the MENU button.
Upper and lower limits of the mains voltages may be too tight.
Upper and lower limits of the mains frequency may be too tight.
Get in the PROGRAM mode and check for the mains voltage and frequency upper and lower limits. If
necessary, widen the limits.
The genset continues to operate after AC mains are reestablished:
Check engine body grounding.
Widen the AC voltage limits.
The
hysteresis
value for the AC voltages is programmable
(P_620)
.
When the AC mains fail, the lower limit is raised and the upper limit is reduced by the
hysteresis value
to
prevent a new load transfer after the load is transferred to the mains.
AC voltages displayed on the unit are not correct:
Check engine body grounding.
The error margin of the unit is +/- 3 volts.
If there are faulty measurements only when the engine is running, there may be a faulty charging
alternator or voltage regulator on the engine. Disconnect the charging alternator connection of the engine
and check if the error is removed.
KW and cos readings are faulty although the Amp readings are correct:
-Current transformers are not connected to the correct inputs or some of the CTs are connected with
reverse polarity. Check the connections of each individual CT in order to obtain correct KW and cos for
the related phase, then connect all CTs.
Short circuit the outputs of unused Current Transformers.
When the AC mains fails the unit energizes the fuel solenoid, but does not start, then gives fail to
start alarm:
The unit is not supplied with battery (-) voltage at the oil pressure input.
-Oil pressure switch not connected.
-Oil pressure switch connection wire cut.
-Oil pressure switch faulty.
-Oil pressure switch closes too lately. If oil pressure falls, the unit will start. Optionally oil pressure switch
may be replaced.
