ARMY TM 9-6115-60412
NAVY NAVFAC P-8-633-12
(2)
Replace.
(a)
Tag and disconnect wiring to PARALLEL SWITCH S6R (12, Figure 5-2) terminals.
(b)
Remove screw in center of handle and slide handle off shaft.
(c)
Remove four screws from face of mounting plate on front of remote control panel. Switch sections
may be removed from rear of panel as an assembly.
(d)
Install replacement PARALLEL SWITCH S6R (12, Figure 5-2) by positioning switch sections at rear
of panel and assemble the mounting plate from the front. Secure the entire assembly with the three
mounting screws.
(e)
Reinstall switch handle in the OFF position, ensuring that shaft is in the OFF position. Secure
handle with attaching screw.
(f)
Connect wires as tagged. Remove and discard tags.
I.
ADJ Rheostat R102R (13, Figure 5-2). The FREQ ADJ rheostat R102R is used to manually adjust the
frequency of the output of generator G1.
(1)
Test
(a)
Shut down the generator set See Figure 2-23.
(b)
Open the RCM panel by unlocking three oval studs across the top of the panel.
(c)
Remove wire from terminal 3 of FREQ ADJ rheostat R102R (13, Figure 5-2).
(d)
Rotate knob fully counterclockwise.
(e)
Set a multimeter to RX1 00 scale and check for continuity across terminals 1 and 2. Resistance
reading should be less than 10 ohms.
(f)
Reset multimeter to RX10OK. While observing the multimeter indication, slowly rotate knob in a
clockwise direction. Meter resistance indication should increase smoothly, with no erratic jumps at
any point in travel.
(g)
When knob (wiper arm terminal 2) is in the fully clockwise stop position, total resistance indication
should be 5000 ±50 ohms.
(h)
Connect wire removed from terminal 3.
(i)
Replace FREQ ADJ rheostat R102R if It fails testing as described above.
(2)
Replace.
(a)
Tag and disconnect wiring to FREQ ADJ rheostat R102R (13) at rear of panel.
(b)
Remove knob (10) from rheostat shaft at front panel.
(c)
Loosen and remove locking nut at front of panel and remove the rheostat assembly from the rear.
(d)
Install replacement FREQ ADJ rheostat R102R (13) from the rear of panel and secure with locking
nut at front. Position rheostat R102R so that when knob is attached, with shaft rotated fully
counterclockwise, the arrow is approximately at a 9 o'clock indication.
(e)
Install and secure knob (10) on rheostat shaft.
(f)
Connect wires as tagged. Remove and discard tags.
m.
OPEN Indicator DS33R and CLOSED Indicator DS34R (14, Figure 5-2). These lamps provide visual indications
of load circuit breaker CB101 position. Green indicator DS33R lights when load circuit breaker CB101 is open and red
indicator DS34R lights to indicate that the circuit breaker CB101 is closed.
5-21
