Wanco AB Series, Owner'S Manual

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10 Owner’s Manual
Wanco Two-Bearing Belt-Drive Generators
Operating the generator with insufficient horsepower is considered
improper use of the generator and will void the warranty.
Although AB- and AR-Series generators have circuit breakers, they
are thermal-type breakers, which take some time to heat up on
overload before tripping. With insufficient horsepower, they may
not trip soon enough to protect connected equipment.
EC-Series generators do not have circuit breakers. To protect
equipment, you MUST supply your own circuit breaker between the
generator and load.
3.1.3 Operating speed
■
Operate AB- and AR-Series generators at a constant speed of 3600
RPM for 60 Hz models or 3000 RPM for 50 Hz models.
❑
All AB25 and AB30 generators are running at the correct speed
when their voltmeters read 120V.
❑
All other AB- and AR-Series generators are operating at the
correct speed when their voltmeters read 240V.
Table 3-1 Minimum horsepower requirements
Generator model Minimum horsepower
AB25, AB25-Hydro,
AB30-Hydro 5 HP
AB50 8 HP
AB60 11 HP
AR100 18 HP
AR250M 50 HP
EC-Series Approximately 2 HP per 1000 watts
CAUTION
Low RPMs will create high amperage demands. High RPMs will
create high voltage.
■
Always operate at the required speed.
■
Use a tachometer when needed.
■
Maximum allowable RPM variation is ±10%.