SECTION VI AC POWER DISTRIBUTION AND POWER SUPPLY ASSEMBLY FUNCTIONAL OPERATION

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

5-614. The lamp enable signals that light the other

are involved with the individual indicators on the front

indicators on the front panel are described in paragraphs

panel.

5-146 through 5-153. No unusual or complicated circuits

SECTION VI

AC POWER DISTRIBUTION AND POWER SUPPLY ASSEMBLY FUNCTIONAL OPERATION

percent) dc voltages: +5 volts at 70 amperes full load,

5-615. INTRODUCTION.

+12volts at 4 amperes full load, and -12volts at 4

amperes full load. When the POWER CONTROL switch

5-616. This section contains a block diagram discussion

on the front panel is set to the ON position, the power

of the ac power distribution in the multiplexer set. This

supply energizes and produces the three regulated dc

discussion, in paragraphs 5-618 and 5-619, also includes

voltages.

The +5 volts lights POWER CONTROL

the input power circuit to the air cooling blower as part of

indicator DS6 on the front panel. When anyone of the

the ac power distribution function. Paragraphs 5-620

three dc voltages increases by more than 20 percent of

through 5-645 contain the block diagram discussion and

the rated outputs, the power supply is automatically shut

detailed circuit discussions for the power supply

down and all indicators on the front panel are out except

assembly (power supply).

POWER SUPPLY ALARMS indicator DS10 on the front

panel. When anyone of the three dc voltages decrease

by more than 20 percent, the POWER SUPPLY

ALARMS indicator on the front panel lights; the power

5-617. AC POWER DISTRIBUTION.

supply does not shut down. When the temperature in

the power supply exceeds 205F (960C), thermostat

5-618. The 115v ac power is applied through RFI filter

switch S1 in the power supply closes to generate signal

A6 on the rear panel (figure 5-45) to circuit breaker CB1

HOT- that energizes temperature alarm relay K2 on the

on the front panel. When POWER CONTROL switch S4

front panel.

When the relay is energized, the

is set to the ON position, the 115v ac is applied to the

TEMPERATURE ALARMS indicator lights, the inhibit

power supply and to EMI filters FL1, FL2. Interlock

power supply signal IPSE is applied through the TEMP

switch S1 is closed when the blower panel is mounted in

SHUTDOWN jumper to shut down the power supply, and

place on the multiplexer set. When the blower panel is

overtemperature signals TEMPC1 and TEMPC2 provide

removed from the multiplexer set, S1 automatically

a closed-loop condition to the REMOTE ALARM

opens and removes the input power. The EMI filters

connector on the rear panel. Temperature alarm relay

prevent any noise generated by the blower from reaching

K2 is a latch relay that remains in the energized state

the logic circuits in the multiplexer set. Run capacitor C1

until the POWER CONTROL switch is set to the OFF

provides the phase shift to energize the Wye wound

position and then back to the ON position. When the

motor in the blower. Bleeder resistor R1 provides a

TEMP SHUTDOWN jumper is not installed, and an

discharge path for C1 when the blower panel is removed

overtemperature condition exists, the power supply

from the multiplexer set.

remains energized and the TEMPERATURE ALARMS

indicator lights.

5-619. The power supply provides three regulated (+1.0

Change 2 5-167