TM 11-6130-266-15
J8 and refer to paragraph 2-6c for charging instructions.
d. For power supply operation, proceed as follows :
(1) Set the AC circuit breaker to ON.
g. Check to see that the 230V-115V selector switch
(2) With the equipment to be powered set to
is in a position that corresponds to the rating of the ac
OFF, set the DC circuit breaker to ON.
power source.
NOTE
2-6. Operation
The desired dc output voltage value
The power supply is used as a general purpose power
of the power supply when powering
supply or to charge a battery. The power supply is
Radio Set AN/VRC-12, AN/VRC-44,
operated in a similar manner for both functions. After
AN/ VRC-45, AN /VRC-47, or AN/VRC -
performing the procedures given in paragraph 2-5,
9 is 25.5 volts. For best performance
operate the power supply as follows:
of equipment, be sure to adjust the
output voltage of the power supply to
a. Set the AC circuit breaker to ON. The AC lamp
25.5 volts when powering Radio Set
lights.
AN/VRC-12, AN/VRC-44, AN/VRC-45,
AN/VRC-47, or AN/VRC-49.
b. Remove the cap from the DC OUTPUT ADJ
potentiometer.
(3) Remove the protective cap over the DC
OUTPUT ADJ potentiometer. Unlock and rotate the DC
c. For battery charging, proceed as follows:
OUTPUT ADJ potentiometer for the desired voltage
(1) Determine the constant charging voltage
value as indicated on the OUTPUT METER. Lock the
value for the battery to be charged.
DC OUTPUT ADJ potentiometer.
(2) Set the DC circuit breaker to ON. The
NORM lamp lights.
(4) Set the equipment to be powered to ON.
(3) Remove the protective cap over the DC
Monitor the current by holding the VOLTAGE-CURRENT
OUTPUT ADJ potentiometer. Unlock and rotate the DC
SWITCH in the CURRENT position and observing the
OUTPUT ADJ potentiometer for the required constant
OUTPUT METER reading.
charging voltage value as indicated on the OUTPUT
METER. Lock the DC OUTPUT ADJ potentiometer.
(5) Release
the
VOLTAGE-CURRENT
(4) Set the DC circuit breaker to OFF.
switch.
(5) Connect the battery to be charged to
either DC OUT receptacle J7 or J9.
2-7. Emergency Operation
(6) Set the DC circuit breaker to ON. (It is
normal for the indicated charging voltage to drop
An emergency condition is indicated by the on-off
because of the current limiting circuit. After the battery
combinations of the three front panel indicator lamps and
has received a portion of recharge, the indicated voltage
the OUTPUT METER indication. The following chart
will be the voltage value obtained in (3) above.
lists various combinations which indicate a different type
(7) When the battery is fully charged, set the
of emergency condition. Except where it is so stated,
DC circuit breaker to OFF.
normal operation continues because the load is
immediately transferred to the external battery. The load
is transferred back to the power supply when the
emergency condition no longer exists.
Emergency condition
EMER indicator lamp
AC indicator lamp
NORM indicator lamp
OUTPUT METER
Low ac input voltage
Lights
Goes out
Goes out
Indicates external bat-
(or dims)
tery voltage.
Surges in ac input
Lights
Goes out
Gees out
Indicates external bat-
voltage
tery voltage.
Note.
This condition trips the
AC circuit breaker. It
must be reset manually
before the load is trans-
ferred back to the
power supply.
2-5
