10
REV A
OPM-136
GENERATOR PROCEDURES
START-UP
1. With the power take-off drive disengaged, start the engine which will
drive the generator. Run the engine long enough to warm it up
before proceeding, so that it will run smoothly and achieve full power
under generator load.
2. With the engine idling, engage the power take-off drive.
3. Watch the frequency meter on the generator and slowly increase
engine speed until frequency reaches approximately 60 Hz. The
voltage output of the generator is controlled by an Automatic Voltage
Regulator (AVR). Before turning on any load, check your voltage
output from the generator using a Volt/OHM meter. If the voltage
is either high or low, adjust the voltage level by turning the voltage
adjustment screw on the AVR. The AVR is located inside the
generator control cabinet. Once the proper voltage level is set, the
AVR should bring the voltage back to the same levl each time the
unit is started up. But, as a precaution, it should be checked each
time you use the generator. As a quick check you can plug in a
trouble light and check for normal brightness.
4. With engine and generator running smoothly, switch on the electrical
load while watching the frequency meter
NOTE: EQUIPMENT DAMAGE
If the load includes motors, turn them on one at a time, highest starting
current motor first, next highest second, etc.
Adjust engine throttle to keep generator output under load at 60Hz.
If the engine is equipped with a governor, it may automatically adjust
the throttle as the load changes and keep the generator output at the
proper level. However, some governors are not sensitive enough to
maintain proper output under changing loads, and in such cases, the
frequency will have to be monitored closely and manually adjusted.
SHUTDOWN
1. Switch off electrical load.
2. Reduce Speed of engine driving generator to idle.
3. Disengage power take-off drive and allow generator to coast to a
stop.
WARNING: PERSONAL INJURY
Never try to manually stop the generator. Always let it coast until it
stops.
4. Shut off the engine.
5. Disconnect drive shaft. Power take-off end first, then the generator
end.
DANGER: PERSONAL INJURY
Power take-off must be DISENGAGED at this time.
4. Couple the tractor to the generator with the drive shaft (tumbling
bar). Couple the tumbling bar to the generator input shaft first, then
to the power take-off shaft. Check alignment, tractor, power take-
off shaft (tumbling bar), and the generator input shaft should form a
straight (or nearly straight) line, with less than 5 degrees
misalignment between the shafts Misalignment will cause generator
output voltage to flicker.
CAUTION:
Make sure that all tumbling bar lock pins are engaged and that all
safety shields are in place before operating the PTO generator.
5. Make sure no binding exists in generator or gearbox. If binding is
found, locate the cause and correct it before proceeding.
6. Make sure that the electrical loads to be driven by the generator will
not draw more current than the ratings of the generator receptacle or
cord set which will supply the current.
7. Check all electrical connections in the system to be energized by the
generator. Make sure the connections are correct and are tight.
8. Make sure all loads are turned off. Do not start generator under load.
