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D-500 MK2 User Manual
41. TROUBLESHOOTING GUIDE
The genset operates while AC mains are OK or continues to operate after AC mains are OK:
-Check engine body grounding.
-AC mains voltages may be outside programmed limits, measure the phase voltages.
-Check the AC voltage readings on the screen.
-Upper and lower limits of the mains voltages may be too tight. Check the parameters Mains Voltage
Low Limit and Mains Voltage High Limit. Standard values are 170/270 volts.
-The hysteresis voltage may be given to excessive. The standard value is 8 volts.
AC voltages or frequency displayed on the unit are not correct:
-Check engine body grounding, it is necessary.
-The error margin of the unit is +/- 2 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.
-If there are faulty measurements only when mains are present, then the battery charger may be failed.
Turn off the rectifier fuse and check again.
KW and cosΦ 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. Determine the correct connections of each individual CT in order to obtain correct KW
and cosΦ for the related phase, and then connect all CTs. Please review chapter "AC CURRENT
INPUTS"
Short circuit outputs of unused Current Transformers.
When the AC mains fails the unit energizes the fuel solenoid, but does not start and OIL
PRESSURE EXISTS ! message is displayed:
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 switch closes, the unit will start. Optionally oil
pressure switch may be replaced.
Below is a basic list of most often encountered
troubles. More detailed investigation may be
required in some cases.
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Firmware V-6.3
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