Generator Failure
Page 38 Panda_12mini_PMS_Digital_s00865_Installation manual.V02 - Chapter C: Generator Failure
23.1.07
Overloading the Generator with Electric Motors
With the operation of electric motors it must be considered that these take up a multiple of their
rated output as starting current (six to tenfold).
If the power of the generator for the engine is not sufficient, the voltage in the generator breaks
down after switching on the engine. For special approach problems the manufacturer can give
recommendations regarding the accomplishment of the situation (e.g. amplified capacitors, gra-
dual start switch or extra developed starting unit for electric motors).
The system efficiency can be improved up to 50% and the starting current can be improved up to
100% by a professional adjustment of the engines. If the inductive load (electrical motors etc.)
lies over 20% of the generator rated output a compensation is appropriate (see in addition also
the writing: "Operation Instructions for Generators with Inductive Loads").
C.2.1 Monitoring the Generator Voltage
ATTENTION! - see “Safety Precautions” on Page vii.
The voltage range of the power stations normally lies between 200 and 240V (100 - 130V in the
60Hz version). In some countries even substantially larger tension deviations are being called
"normally". The PANDA generators are aligned that they keep these default values during normal
load.
With high load or overload it can occur that the voltage drops on 190V (95V in the 60Hz version)
and partly still more deeply. That can become critical for certain devices (e.g. for electric motors,
cooling compressors and possibly for electronic devices). It must be paid attention that the
voltage for such load is sufficient. This can be supervised by a voltmeter.
The voltmeter should be always installed behind the change over switch generator/land power,
so that each voltage source is shown. No further voltmeter is provided for the generator itself.
If additional load is switched on, the voltage must be controlled in each case at the voltmeter.
Sensitive devices must be switched off so long, until the voltage exceed the critical parameter.
Under certain circumstances the generator provides overvoltage. This arises if the number of
revolutions of the generator is increased. Changing the number of revolutions may be made only
with a tachometer and/or a voltmeter.
If sensitive and/or valuable devices are used, which are to be protected against this risk, an auto-
matic overvoltage protection must be mounted. (voltage control with disconnection).
C.2.2 Automatic Voltage Monitoring and Auto-Shut Down
If air conditioning units (compressors) or other such valuable equipment is installed on-board, it is
recommend that an automatic voltage monitoring unit be installed to protect this equipment from
possible sharp voltage drops. The voltage monitoring system shuts down the entire system (and
therefore all users) by means of a circuit breaker relay as soon as the voltage falls below a set
value (the monitor will also shut down the on-board grid automatically when the generator is stop-
ped). Such a relay with contactor can be obtained from the installator or as a complete unit from
your Panda dealer.