Product Manual

16
Adjusting Voltage for PTO’s
All PTO’s with 12 wire
units feature an
automatic voltage regulator that will
maintain +/- 1 ½% voltage regulation.
The voltage regulator is preset at the
factory for the required voltage. If a
change in voltage is required, the
frequency meter MUST be connected to
one line (hot) wire and to the neutral
connection for the meter to function.
On a three phase 240 volt series delta
connection, there is no neutral. For
neutral conncection you must use the
center tap(CT) adjacent to the line
connection you choose. With the
frequency meter operating at 60 hertz
(50 hertz for 50 hertz operation and the
jumper installed) you can increase or
decrease the voltage by simply adjusting
the Phillips screw marked VOLTS on the
automatic voltage regulator.
See connections/reconnections page
The generator must
be operating at the
proper speed (RPM) before and while
adjusting the voltage regulator. Turn the
VOLTS adjusting screw very slowly stop
and wait 2 or 3 seconds and read the
voltage from one of the lines and
neutral connection (note that on the
three phase 240 volt series delta
connection there is no neutral so you
must go to the center tap as a neutral.
Adjust the voltage up or down by
turning the VOLTS clock wise or counter
clock wise. Once the voltage is adjusted,
do not adjust any of the other Phillips
screws on the automatic voltage
regulator. Refer to the re connection
chart if you are changing voltages. Near
the automatic voltage regulator are the
main power terminals of the generator.
If you make contact with the main
terminals, serious injury and death will
occur. These adjustments MUST be done
by a licensed electrician or technician
familiar with high voltage equipment.
This is NOT a do it yourself activity.
From the automatic voltage regulator
terminal 4 a green wire always goes to
stator lead wire 3. From the automatic
voltage regulator terminal 5 a black
wire always goes to stator lead wire 4.
This applies to single and three phase
units both 50 and 60 hertz and any
voltage combination. On 60 hertz
versions, single and three phase and any
voltage combination,
there is a small brass jumper connected
on the automatic voltage regulator
between terminal 5 and terminal 6. For
50 hertz operation, this jumper is
removed.
Adjacent to the automatic voltage
regulator is the radio suppressor on
some models. The lead wires from the
radio suppressor are always red and
must go to the stator leads wires 5, 7, 9
and 12 on any version in single or three
phase., 50 or 60 hertz and any voltage
combination. Some leads may be on
the same terminals as other depending
on the various phase and voltage
combinations.
Changing voltage will change the
amperage output of the generator. The
circuit breaker should be changed
accordingly.
OPERATING GENERATOR
SHAFT SPEED
For 60 hertz
operation the
generator shaft speed of 1800 RPM
must be continuously maintained. The
operating speed range is 1700 RPM to
1900 RPM for 60 hertz. Shaft speed of
the gear box connected to the
generator is either 540 RPM or 1000
RPM depending on the model. Slightly
lower gear box speed(about 520 RPM
for the 540 RPM on/or 970 RPM for the
1000 RPM unit is acceptable, the
frequency meter at 60 hertz is how to
determine proper speed. These are NOT
variable speed generators.
GUARD FOR PULLEYS, BELTS
AND COUPLINGS
All rotating
equipment MUST
be equipped with guards to prevent
contact with rotating shafts, pulleys,
belts and couplings. The customer is
responsible for installing the
appropriate guards. Serious personal
injury or death could result without
proper guards in place while the
generator is in operation.