TM 554920-221-14
39.
T1 variable knob
43.
Nameplate
40.
Screws
44.
T1 variable control
41.
Knob
45.
Nameplate
42.
Screws
46.
Screw (4 rqd)
Figure 10-Continued.
118. AMMETER PHASE SELECTOR AND CIRCUIT
(4) Remove three-phase ammeter and
SELECTOR SWITCHES.
wattmeter range selector (26) from inside panel by
removing three screws (40).
a. Removal.
b. Cleaning and Inspection.
(1) Tag and disconnect electrical leads from
terminals on ammeter phase selector (24, figure 10).
(1) Clean parts with a cloth dampened in dry
cleaning solvent P-D-680 and dry thoroughly.
(2) Remove knob (41) from ammeter phase
selector.
(2) Inspect range selector for cracked or
damaged case, sticking or binding contacts, and
(3) Remove ammneter phase selector from
damaged terminal threads.
inside control panel by removing four screws (42) and
nameplate (43) from front of panel.
(3) Repair damaged threads by chasing,
when practical.
(4) Remove circuit selector switch (25) in a
similar manner.
c. Installation.
b. Cleaning, Inspection, and Repair.
(1) Attach
three-phase
ammeter
and
wattmeter range selector (26) in control panel with three
(1) Clean parts with cloth dampened in dry
screws (40).
cleaning solvent P-DO0 and dry thoroughly.
(2) Attach nameplate (27) on control panel
(2) Inspect phase selector and circuit selector
with four screws.
switch for cracked or damaged case, weak or broken
spring, sticking or binding contacts, and damaged
(3) Connect electrical leads to range selector
terminal.
terminals.
(3) Repair damaged threads by chasing,
(4) Rotate range selector in 10 position.
when practical.
Install range selector knob (2) on shaft of range selector
securing with setscrew.
(4) Inspect threaded parts for worn or
damaged condition.
120. TOTAL LOAD DISCONNECT SWITCH AND
c. Installation.
PANEL.
(1) Position ammeter phase selector (24) in
a. Removal.
control panel by aligning selector and panel mounting
(1) Tag and disconnect electrical leads from
hole.
terminal block (9, figure 11) and three relays (14).
(2) Attach nameplate (43) on front of panel
(2) Remove panel and attaching parts from
with four screws (42).
frame by removing three screws (1;5).
(3) Position knob (41) on selector shaft and
(3) Tag and disconnect electrical leads from
secure with knob setscrew.
two pushbutton switches (33 and 34, figure 10).
(4) Connect electrical leads to terminals of
(4) Unscrew pushbutton (35) from pushbutton
ammeter phase selector.
switch (33).
(5) Install circuit selector switch (25) in a
(5) Remove
pushbutton
switches
by
similar manner.
removing two knurled nuts (36).
119. THREE-PHASE AMMETER AND WATTMETER
(6) Remove nameplate (45) by removing four
RANGE SELECTOR.
screws (46).
a. Removal.
b. Disassembly.
(1) Loosen setscrew and remove range
(1) Tag and unsolder leads from resistor (1,
selector knob (2) by placing three-phase ammeter and
wattmeter range selector (26, figure 10) in 10 position.
(2) Remove resistor (1) from panel (2) by
(2) Tag and disconnect electrical leads from range
removing two screws (3).
selector terminals.
(3) Remove variable resistor (17) in a similar
(3) Remove nameplate (27) from control
manner.
panel by removing four screws.
37
