15
OPM-114
REV B
CONNECTING THE LOADS
WARNING:
All wiring must be done in accordance with National Electric Code
NFPA 70.
There are three ways the loads may be connected to the RP25:
1. Front Panel -
A variety of receptacles have been provided for your convenience
on the front panel. The 120V receptacles are powered when the
voltage selector switch is in the 120/240 single phase, 120/40V three
phase, and 120/208V three phase position. The 240V receptacles
are only usable in the 120/240V single phase and 120/240V three
phase position. In the 120/208V position, the 240V receptacles have
only 208V at them. Refer to the voltage output table, located
previously in this manual.
2. Full Power Load Connection Terminal Block -
For remote connections and connecting load distribution boxes,
heavy duty terminal blocks have been provided. These terminal
blocks are located on the rear of the unit justs below the DSE7310
MKII controller. The neutral and ground are connected together
at this panel. For use with an isolates neutral, remove the jumper
strap between the neutral connection block and the ground lug. This
will isolate the neutral from the ground and allow your a single point
grounding at a distribution panel. When using these terminal blocks,
be sure to use wire rated large enough to carry your full load or the
full rated load of the generator.
3. Full Power Cam-Lock Connections -
For ease of connecting and disconnecting loads, these units have
been equipped with Cam-Locks located behind the right hand, rear
door. See the Cam-Lock Connections in this manual. Instructions
for the Full Power load Connection Terminal Block apply for the
Cam-Locks. If you need to run an isolated neutral system, the
jumper between the neutral and ground musts be removed at the
terminal block.
4. Grounding The Unit -
To comply with current safety standards, this generator set must be
properly grounded. Ground the RP25 by driving an eight foot copper
ground rod into the earth. Then connect a #4AWG ground cable
from the grounding lug on the generator to the ground rod.
50 CYCLE OPERATION
With a couple of minor changes, these mobile diesel generators are
capable of producing 50Hz power. Two changes must be made:
1. The engine must be reduced to 1500 RPM governed speed.
Consult your local Isuzu service center for the proper procedure
for reducing engine speed and setting up the governor to operate
at 1500 RPM.
2. The automatic Volt/Hz regulator must be also reset to operate at
50 Hz. Refer to the Stamford generator manual for instructions.
VOLTAGE REGULATOR WIRING
AS440 Automatic Voltage Regulator
The following is a list of connections on the AVR. These have been
factory set and other than voltage adjustment, should never be
changed.
VOLTS
To adjust generator output voltage.
Clockwise to increase voltage.
STABILITY
To prevent voltage hunting.
Clockwise to increase the dampening effect.
STANDARD CONNECTIONS
Terminals 1 & 2 will be fitted with a shorting link if no hand trimmer is
required.
Terminals La & Lb are linked only for special low voltage applications.
UFRO - Under Frequency Roll Off
Terminal S1 is connected to the C.T., S2 on the AVR.
DROOP - Normally preset in the works to give 5% voltage droop at full
load zero power factor.
Terminal A1 is connected to the AVR 0 Volts. Positive on A2 increases
excitation, negative on A2 decreases excitation.
TRIM - allows the user to adjust the sensitivity of the input.
LED Indicator Light - indicates over excitation condition or under speed
running.
