Fischer Panda 22-4 HD PVMV-N, Руководство пользователя

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Generator Failure
10.5.11 Panda 8000-42NE PVMV-N.R01 - Kapitel/Chapter 8: Generator Failure Seite/Page 97
8.4 Overloading the Generator
Please ensure that the genset is not overloaded. This is especially the case with multi-power aggregates. Overloa-
ding occurs when the electrical load (demand) induces a load torque in the generator which is higher than what the
diesel drive motor can provide. Overloading causes the engine to run rough, burn oil, create excessive exhaust
(environmentally unfriendly) and even to stall.
The generator should only be loaded at the peak rated power for short periods only! A high peak current is required
to start many electrical devices, especially electric motors and compressors (from a still stand state).
In order to prolong the genset´s life expectancy, the nominal electrical demand on the system should not be more
than 70% of the rated genset power.
Bear this in mind when switching on electrical devices. This ensures a longer life expectancy.
Continuous performance is the uninterrupted running of the generator for many hours. The genset can be run for
several hours at partial load (i.e. 2/3 of rated power), however it is not advised that it is run for more than 2-3 hours
at full load.
The Panda is designed so as not to overheat even under extreme conditions. Note: The exhaust gas will become
sooty during peak-load operation.
8.4.1 Effects of Short Circuiting and Overloading on the Generator
The generator cannot be damaged by short circuiting or overloading. Short circuiting and overloading suppress the
magnetic excitation of the generator, thus, no current is generated and the voltage will collapse. This condition is
immediately offset once the short-circuit has been eliminated and/or the electrical overload removed.
8.4.2 Overloading the Generator with Electric Motors
Please note that electric motors require six to ten times more power than their rated capacity to start.
If the supplied generator power is lower than what the electric motor requires, the generator voltage will collapse. For
applications where a high current draw is required to start an electrical device (such as an electric motor), the motor
manufacturer should be consulted for possible solutions (for example: stronger capacitors, gradual power-up swit-
ches, or a specially designed starting unit for electric motors).
System efficiency can be improved by up to 50% and motor current draw (to start) reduced by as much as 100% if it
is properly designed. If the inductive load (i.e. E-Motor) is more than 20% of the generator nominal power, a com-
pensation is necessary. See also the information brochure "Special information for operation of Panda generators
with inductive load".
8.4.3 Generator Voltage Fluctuations and Monitoring
Notice!:
Before working (installation) on the System read the section Safety Instruc-
tions in this Manual.
During periods of high electric loading, the voltage may drop to 190V/50Hz (or 95V/60Hz) or even lower. Such
voltage drops can potentially cause damage to certain electrical devices such as electric motors, compressors and
electronic equipment. In order to ensure that sufficient voltage is available and to avoid the risk of damage to sensi-
tive electrical devices, the supply voltage should be monitored with the voltmeter, which is mounted at the operation
unit.