TM 55-4920-221-14
30. A10 TERMINAL.
23. FIELD TERMINAL.
The A10 terminal (2, figure 6) is the input
The field terminal (52, figure 6) provides field
terminal for single-phase generators and inverters when
connection when an external generator is connected to
used with the N terminal (36).
the battery generator terminals (34). Rotate rheostat
regulator switch (26) to REGULATE position and
31. AMMETER PHASE SELECTOR SWITCH.
rheostat test switch (25) to BATTERY GENERATOR
position for field rheostat (44) to control the external
generator voltage.
each leg of T1, T2, and T3 terminals (37).
24. A AND D FIELD TERMINALS.
32. CIRCUIT SELECTOR SWITCH.
The A and D field terminals (53, figure 6)
The circuit selector switch (56, figure 6) is used
provide field connections for dc generators. Rotate
to switch the three-phase wattmeter (39) from three-wire
rheostat regulator switch .(26) to RHEOSTAT position
to four-wire input.
and rheostat test switch (2'5) to TEST GENERATOR
33. SINGLE-PHASE WATTMETER.
position for field rheostat (44) to control generator
The single-phase wattmeter (38, figure 6),
voltage.
indicates power used for single-phase inputs, with
25. DC GENERATOR INPUT TERMINALS.
sensitivity controlled by single-phase ammeter and
DC generator input terminals B+28V, 50A 28V,
wattmeter range selector (64).
250A 28V, and 500A 28V (figure 6) are used for
34. T1 VARIABLE CONTROL.
connecting dc generators under test.
The T1 variable control (63, figure 6) varies the
26. SINGLE-PHASE AMMETER AND WATTMETER
load on the T1 terminal (37) from 0 to 1 kw for single- or
RANGE SELECTOR.
three-phase inputs.
For single and three-phase
generators, close switch T1 of the ac generator load
The single-phase ammeter and wattmeter range
switches (49). For three-phase inverter inputs, close
selector (64, figure 6) is used to increase sensitivity and
switch T1 of inverter load switches (47).
range of the single-phase ammeter (4) and single-phase
wattmeter (38). Selector must be placed on highest
35. SINGLE-PHASE AMMETER.
scale to energize meter circuit.
The single-phase ammeter (4, figure 6)
27. N TERMINAL.
indicates load current in single-phase inputs. Sensitivity
of the meter is controlled by the single-phase ammeter
The N terminal (36, figure 6) is an ac input
and wattmeter range selector (64).
terminal. For single-phase inputs, use A10 terminal (2).
For three phase, four-wire input, use T1, T2, and T3
36. THREE-PHASE WATTMETER.
terminals (37).
The three-phase wattmeter (39, figure
28. A+, F AND A- TERMINALS.
measures power used in three-phase, three- and four-
wire inputs. This meter is switched from three- to four-
A+, F, and A- terminals (54, figure 6) are the
wire input by the circuit selector switch (56). Sensitivity
input terminals for field connections of ac generator
is governed by the three-phase ammeter and wattmeter
voltage regulators.
range selector (57).
29. TI, T2, AND T3 TERMINALS.
37. THREE-PHASE AMMETER.
The T1, T2, and T3 terminals (37, figure 6), are
The three-phase ammeter (5, figure 6) indicates
the input terminals for ac generators and inverters. The
load current on T1, T2, or T3 input terminals (37) by
three terminals are used for connecting ,three-phase,
rotating the ammeter phase selector switch (55).
three-wire inputs, and three-phase, four-wire inputs,
Sensitivity is governed by the three-phase ammeter and
using the N terminal (36).
wattmeter range selector (57).
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