TM 5-6115-593-12
TO 35C2-3-463-1
with guards (21 and 37) onto
front
panel
with
mounting
hardware.
(d)
Attach wires to switches S22
and S20 (20 and 36) and
remove tags.
4-33. POTENTIOMETER R104 REACTIVE LOAD
COMPENSATION CONTROL (47, figure 4-18).
a.
Test
(1)
Tag and unsolder leads from R104
(47, figure 4-18).
(2)
Connect an ohmmeter (Rx1 scale to
each
of
the
terminals
on
the
potentiometer.
(3)
Turn potentiometer slowly throughout
its
range
(0
to
1
ohm).
As
potentiometer
is
rotated,
the
ohmmeter reading should move at the
same rate as the rotating shaft. If
ohmmeter pointer does not move, or
moves erratically the potentiometer is
defective and should be replaced.
b.
Replacement.
Replace
defective
potentiometer (47) as follows:
(1)
Removal. Tag leads and remove
mounting hardware.
(2)
Installation. Install potentiometer in
panel
with
mounting
hardware.
Solder wires and remove tags.
4-34. POTENTIOMETER R103 (54, FIGURE 4-17).
a.
Test. This potentiometer is located at the top
of the governor controller assembly (56,
figure 4-17).
(1)
Tag and unsolder leads from R103
(54).
(2)
Connect an ohmmeter to each of the
terminals on the potentiometer.
(3)
Turn potentiometer slowly throughout
its range (0 to 500 ohms). As the
potentiometer is rotated, the ohm-
meter reading should move at the
same rate as the rotating shaft. If the
ohmmeter pointer does not move, or
moves erratically, the potentiometer is
defective and should be replaced.
b.
Replacement.
Replace
defective
potentiometer (54) as follows:
(1)
Removal. Tag and remove wires.
Remove shaftlock (55) to remove
potentiometer.
(2)
Installation. Install potentiometer (54)
and secure with shaftlock. Solder
wires and remove tags.
4-35. MOTOR-OPERATED POTENTIOMETERS B4
(2, figure 4-19) and B5 (4, figure 4-19). Inspect motor-
operated potentiometers B4 (2, figure 4-19) and B5 (4,
figure 4-19) for loose connections, broken leads,
cracking, or loose mounting.
4-36. DC AMP SHUNT (6, figure 4-19).
a.
Test.
(1)
Connect a 0 to 30 amp DC power
supply to the terminals of the DC amp
shunt (6, figure 4-19).
(2)
Connect a 0 to 0.10 volt DC meter to
the terminals of the DC amp shunt.
(3)
Increase power to 30 amps; the
voltmeter should read 0.05 volts +10
percent.
(4)
If correct reading is not obtained,
refer
to
next
higher
level
of
maintenance.
4-37. RELAYS. Inspect K20, K1 and K50 relays (33,
figure 4-17 and 7 and 18, figure 4-19) respectively for
loose
mounting,
loose
connections,
cracking,
or
damaged castings.
4-38. HARNESS ASSEMBLY.
WARNING
Set MAINTENANCE LOCKOUT switch to
LOCKOUT. Disconnect negative cable
from batteries. Remove external power
by opening CB101 (120V RECEPTACLE
BREAKER). Load terminals of generator
set circuit breaker (CB2) may still be
energized with bus voltage.
4-57
