<< I'm going to look at an ex-military generator (3KW) with a four cylinder
Continental engine that produces both single phase and triple phase
current (according to the owner). The current owner says that it needs
some repair in that it is not producing 60 cycles (at least that's what
the gauge indicates) and that he hasn't been able to get it set >>
Robert,
Frequency, of course, is a function of rotor speed. The offered comment about
the genset perhaps not getting to full speed is most probable. Frequency
gauges on gen sets tend to be one of two types: Older sets have a mechanical
reed type, which vibrates a tuned metal reed so that it appears a different
color than its partners. This type, unless physically damaged, is generally
reliable. Newer sets have a silicon chip that analyzes the set's output and
gives a readout on an LED or LCD display. These are very prone to static
damage and the elements. It's easy to see which type of frequency device the
set uses. I would look for a mechanical reason that the set is not putting
out...a bent carb or governor linkage, misadjusted throttle stop, fuel
restriction, etc. Take along a simple mechanical tach and actually measure
the shaft speed if you can. It should be some mutiple of 60, depending on the
# of poles in the generator. Most of the mil sets run at 1800 rpm or 3600 rpm.
Hope this helps a bit!
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