3
SECTION 2
INSTALLATION
SAFETY SUMMARY
WARNING
To prevent injury to personnel or damage to
equipment, this unit shall be installed only in
accordance with installation instructions and
wiring diagrams contained in the instruction
manual provided with this unit.
WARNING
When this unit is operating, 120 VAC and 120-139
or 208-240 VAC is present at the voltage regulator
assembly terminal board and internal circuitry. To
avoid accidental contact with lethal voltage, de-
energize the generator set starting circuit while
making electrical connections or repairs to this
equipment.
CAUTION
Meggers and high potential test equipment
should not be used. Incorrect use of such equip-
ment could destroy the rectifiers, transistors and
capacitors in the regulator.
LOCATION
The voltage regulator may be mounted in the generator
terminal box or remotely mounted. The enclosure in
which the regulator is to be mounted should be of
sufficient size to permit flow of air about all sides of the
regulator.
MOUNTING
Mounting holes are incorporated in the regulator base.
The regulator can be mounted in any position without
affecting its operating characteristics.
ELECTRICAL CONNECTIONS
The regulator must be connected to the generator
system as instructed in the paragraphs that follow and
as shown on the diagrams for the generator and control
system. Number 14 gauge or larger wire should be
used for all connections to the voltage regulator.
A. Regulator Input Power Terminals L1 and L2.
The nominal voltage applied to the regulator input
power stage (terminals L1 and L2) must be single
phase, 400 hertz, 120 volt ac. The input power may be
taken from any generator lines that provide the correct
voltage (line-to-line or line-to-neutral).
NOTE:
When the generator output is different from
the preceding value, a power transformer must be
used to match the generator voltage to the required
regulator input. If excessive voltage is applied to the
regulator input terminals L1 and L2), destruction of
the rectifiers in the regulator could occur.
B. Fuse F1.
The voltage regulator contains a 250
volt, 5 amp., ABC-5 type fuse located within a fuse
holder that is mounted on the voltage regulator
chassis. Replacement fuse must be a normal break
fuse of the same capacity. A time delay type fuse
should not be used.
C. Grounding
. The dc output circuit to the exciter
field must not be grounded. Regulator chassis
grounding can be accomplished by solidly mounting
the voltage regulator onto a metal cubicle which in
turn is grounded, or by connecting a ground wire from
the regulator case to ground.
D
.
Regulator Sensing (Terminals E1, E2 and E3).
The voltage regulator is designed for three phase,
400Hz, 120-139 or 208-240 Vac sensing. Follow the
interconnection diagram provided with the generator
set.
E. Sensing Transformer (T1 and T2) .
Verify that the
sensing transformers located in the voltage regulator
are connected as follows: Tap H2 for 120 or 208 Vac
and Tap H3 for 139 or 240 Vac.
F. Voltage Regulator dc output Terminals F+ and
F-.
This circuit provides DC excitation to the exciter
field. Observe correct polarity. F- connects to exciter
field lead F1 (-) and F+ to exciter field lead F2 (+). In
applications where field wires are longer than a foot
or two, shielding by running the field lead through
one-half inch conduit is recommended.
G. Externally Mounted Voltage Adjust Rheostat
(Terminals R1 and R2)
. Connect the voltage adjust
rheostat as shown on the wiring diagram provided
with the generator set. Make certain rheostat contains
a jumper wire between its slider terminal 2 and the
rheostat end terminal 1. When correctly connected,
turning the rheostat clockwise increases generator
voltage output.
H. Paralleling Terminals (Terminals CT1 and CT2).
On voltage regulators with paralleling, connect these
terminals to the paralleling circuit as shown on the
system drawing. If used for single unit operation,
short terminal CT1 to CT2.
