Summary
The preceding discussion and examples of governor
operation can be summarized as follows:
1. The simplest governor combination for paralleled
electric sets is to have a 3% speed droop characteristic
for each governor. If a constant frequency from no-load
to full-load is required, one governor can be adjusted for
isochronous operation. This is called a "lead unit”.
2. In order for all paralleled units to accept their full
share of the load, the following governor adjustments are
required:
a. The same full load speed.
b. The same high idle (no-load) speed in the case of
governors adjusted for speed droop operation.
c. Governor controls set to the high idle position so the
full governor range is available.
3. Operation of an isochronous governor in parallel with
speed droop governors requires the special techniques
described in example 2.
4. Any number of electric sets can be operated in
parallel. However, only one governor of the group can
be adjusted for isochronous operation except in the
special cases of electronic governors with automatic
load sharing.
Electronic (2301) Governor
When using Electronic Governors (2301) load sharing
will be done automatically if it is a load sharing
Governor.
Stopping
To remove a generator from the line do the following:
1. Check the load. It must be less than the rated
capacity of the remaining units.
2. Be sure the neutral of one of the remaining units is
grounded.
3. Remove the load from the outgoing unit as described
in LOAD DIVISION. The amperage may never go to
zero due to circulating currents.
4. Open the circuit breaker.
5. Allow the engine to cool for 5 minutes.
6. Stop the engine.
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