Table 7-6.--Controls and Indicators for the master Control Panel
No.
NOMENCLATURE
DESCRIPTION
FUNCTION
1
VARIABLE 0-55 AMPS
Variable carbon-pile
Controls variable load applied to aircraft
resistor
servicing bus from 0-55 A. Operates in
conjunction with AIRCRAFT SERVICING
LOAD SELECTOR DC AMPS toggle switch
0-55 on the dc control panel (fig. 7-64).
2
INTENSITY
Variable resistor
Controls intensity of dc control panel lights
and dc cable input lights.
3
DC PANEL LIGHTS
2-position toggle switch
Controls dc control panel lights, dc cable input
lights, and placard lights.
4
VARIABLE 0-55 AMPS
Variable carbon-pile
Controls variable load applied to jet starting
resistor
bus from 0 to 55 A. Operates in conjunction
with JET STARTING LOAD SELECTOR DC
AMPS toggle switch 0-55 on the dc control
panel (fig. 7-64).
5
EXTERNAL POWER
Indicating light with red
Illuminates only when the CONTROL
lens
POWER switch (not shown) is ON, and the
AC external power cable is fully plugged in,
which provides continuity between pins E and
F of the plug.
6
WIND SWITCH
Indicating light with green
Illuminates when cooling fans are operating
CLOSED
lens
properly.
7
CONTROL CIRCUIT
3-position toggle switch
In DC position, selects control circuit power
DC OFF AC
directly from aircraft servicing dc input. In AC
position, selects control circuit power from
stepped-down and rectified ac input. In OFF
position, deenergizes all control circuits.
8
VARIABLE 0-3.5 KW
Variable 3-phase
Controls variable resistive load applied to ac
autotransformer
input lines from 0 to 3.5 KW. Operates in
conjunction with RESISTANCE LOAD
SELECTORS 3 PHASE KILOWATTS toggle
switch 0-3.5 on the ac control panel (fig.
7-65).
9
INTENSITY
Variable resistor
Controls intensity of ac control panel lights.
10
AC PANEL LIGHTS
2-position toggle switch
Controls ac panel lights and placard lights.
11
VARIABLE 0-3 KVAR
Variable 3-phase
Controls variable reactive load applied to ac
autotransformer
input lines from 0 to 3 KVAR. Operates in
conjunction with REACTANCE LOAD
SELECTORS 3 PHASE KILOWATTS toggle
switch 0-3 on the ac control panel (fig. 7-65).
12
CIRCUIT CHECK
Cannon Plug
Provides receptacle for using an AN/USM-128
Generator Test Set to verify ac, dc, and
frequency gauges.
7-57
