ARMY TM 9-6115-604-12
NAVY NAVFAC P 8 633-12
c.
Install. See Figure 4-66.
(1) Install GEN/BUS VOLTMETER switch Si12 (10) by positioning switch sections at rear of cabinet B door and
assemble the mounting plate from the front. Secure the entire assembly with the three mounting screws.
(2) Replace switch handle in the OFF position ensuring that shaft is In the OFF position. Secure handle with
attaching screw.
(3) Connect wires and discard tags.
4-108. VOLT ADJ RHEOSTAT R101 (26, Figure 2-2). VOLT ADJ rheostat R101 is used to manually adjust voltage
out-put of generator G1.
a.
Test.
(1) Remove wire from terminal 3 of VOLT ADJ rheostat R101.
(2) Rotate knob fully counterclockwise.
(3) Set a multimeter to RX1 scale and check for continuity across terminals 1 and 2. Maximum resistance
should be 1 ohm.
(4) Reset multimeter to RX1 K scale. 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.
(5) When knob (wiper arm-terminal 2) is in the fully clockwise stop position, total resistance indication should be
500 50 ohms.
(6) Connect wire removed from terminal 3.
b.
Remove. See Figure 4-68.
(1) Tag and disconnect wiring to rheostat (8).
(2) Remove knob (7).
(3) Loosen and remove locking nut at front of cabinet B door and remove assembly from the rear.
c.
Install. See Figure 4-68
(1) Install VOLT ADJ rheostat R101 (8) from the rear of cabinet B door and secure in position so that when knob
(7) is attached, with shaft rotated fully counterclockwise, the arrow Is at 9 o'clock position.
(2) Secure knob (7).
(3) Connect wires and discard tags.
4-109. PARALLEL SWITCH S6 (18, Figure 2-2). PARALLEL Switch S6 is a two-section, or deck, rotary switch with
handle spring return to normal-vertical position following a command operation. The switch is used to select either single
or parallel generator set operation.
NOTE
Switch wiring position numbers are translated as follows: the first digit defines the
section, or decks, In relation to the handle end, the second digit is a specific terminal on
that deck. For example, position 23 is located on the second deck, the contact is
terminal number 3.
a.
Test.
(1) Tag and disconnect wiring to switch contacts. See Figure 4-71
(2) Set a multimeter to RX1 scale and test for contact continuity in the switch positions specified in chart in
Figure 4-71 Meter should indicate zero ohms at all points marked in the chart.
(3) Multimeter should indicate infinity at all blank contacts in the chart.
(4) Rotate handle to the SINGLE position and release handle. Handle should return to the normal-vertical
position automatically.
(5) Repeat step (4), above, with handle rotated to the PARALLEL position.
4-174
