Fischer Panda AGT 6000 PVMV-N, Manual

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Generator Failure
AGT 6000 PVMV-N 12V_24V - Chapter D: Generator Failure Page 77
D. Generator Failure
D.1 Overloding the Generators
Please ensure that the genset is not overloaded. This is especially the case with multi-power
aggregates. Overloading 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 gen-
set 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.
Effects of Short Circuiting and Overloading on the Generator
The generator cannot be damaged by short circuiting or overloading. Short circuiting and over-
loading 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 elimina-
ted and/or the electrical overload removed.
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 solu-
tions (for example: stronger capacitors, gradual power-up switches, or a specially designed star-
ting 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 compensation is necessary. See also the information brochure
"Special information for operation of Panda generators with inductive load".