TM 55-4920-221-14
16.
Dc voltmeter circuit selector
41.
Overheat indicator
17.
Dc voltmeter switch
42.
Pressure gage
18.
Unexcited bus test indicator
43.
Dc ammeter terminal selector
19.
External voltmeter terminals
44.
Field Rheostat
20.
Unexcited bus test switch
45.
Dc generator load switches
21.
Load disconnect switch
46.
T3 variable control
22.
Equalizer coil test switch
47.
Inverter load switches
23.
Auxiliary power pack switch
48.
Ac voltage regulator terminal
24.
Phone jack
49.
Ac generator load switches
25.
Rheostat test switch
50.
Inverter switch
26.
Rheostat regulator switch
51.
Inverter input terminals
27.
Relay pad
52.
Field terminal
28.
Connection board
53.
A and D field terminal
28.
Load disconnect-links
54.
A+, F, and A-terminals
30.
Instruction plate
55.
Ammeter phase selector switch
31.
Load links
56.
Circuit selector switch
32.
Ac-dc switch
57.
Three-phase ammeter & wattmeter
33.
Battery switch
range selector
34.
Battery generator terminals
58.
Wattmeter fuse
35.
Dc generator input terminals,
59.
Voltmeter phase selector
B+28V, 500A 28V,
60.
Phase sequence indicator
250A 28V, 50A 28V
61.
T2 variable control
36.
N terminal
62.
Alternator field switch
37.
T1, T2, T3 terminals
63.
T1 variable control
38.
Single-phase wattmeter
64.
39.
Three-phase wattmeter
range selector
40.
Ac voltmeter
Figure 6--Continued.
Section II. CONTROLS, INSTRUMENTS, TERMINALS, AND LOAD LINKS
are used for applying fixed or varying loads, for one-
14. GENERAL.
and three-phase inputs. For fixed loads, use the 3 kw
This section describes, locates, illustrates, and
load switches as required. For varying loads from 0 to 1
furnishes the operator with sufficient information
kw, close switches T1, T2, and T3 and operate T1, T2,
pertaining to the various controls, instruments,
and T3 variable controls.
terminals, and, load links provided for proper operation
19. INVERTER SWITCH.
of the equipment.
The inverter switch (50, figure 6) is used to turn
15. LOAD LINKS AND LOAD-DISCONNECT LINKS.
inverter under test ON or OFF.
The load links (31, figure 6) are used to set up
20. INVERTER INPUT TERMINALS.
load resistances as determined by equipment under test.
The inverter input terminals (51, figure 6)
Load-disconnect links (29) set up the load-disconnect
provide dc power input to operate the inverter under
switch (21).
test.
16. AC VOLTAGE REGULATOR TERMINALS.
21. BATTERY GENERATOR TERMINALS.
The ac voltage regulator terminals (48, figure 6)
The positive (+) and negative (-) battery
provide input connections for testing ac voltage
generator terminals (34, figure 6) provide input
regulators with internal leads.
connections for an external battery or generator source,
17. INVERTER LOAD SWITCHES.
when testing reverse-current cutout relays.
The three inverter load switches (47, figure 6),
22. BATTERY SWITCH.
are used for testing the ac output of inverters by varying
The battery switch (33, figure 6) is an ON-OFF
T1, T2, and T3 controls, loading each phase separately
switch used to control external power source of the
from 0 to 1 kw.
battery generator terminals (34).
18. AC GENERATOR LOAD SWITCHES.
The ac generator load switches (49, figure 6)
9
