Figure 6-3. Power Supply Test Set Input Power Switching to the UUT

ARMY TM 5-6675-309-14

MARINE CORPS TM 08840A-14/1

Figure 6-3. Power Supply Test Set Input Power Switching to the UUT

k. At the end of the 2-second interval measured by

switch can be tested under no-load conditions, and the

PS battery charging circuitry can be tested. Testing the

the 2-second timer, if the UUT has not crowbarred or

PS battery charging circuitry is accomplished by using 0

turned itself off by its undervolt detection circuitry, the

PSTS will turnoff power to the UUT. This turnoff is

to +40V, 20-amp input power with the PSTS MODE

accomplished by fail detection circuitry which trips a

switch set in the NO LOAD position. Then, with

200-mA circuit breaker. The 200-mA circuit breaker is

INPUT POWER UUT circuit breaker closed, the input

ganged with the INPUT POWER UUT circuit breaker

power is routed directly to PSTS connector J6 and to

so that both breakers trip. When the PSTS 2-second

connector J7 through relay RA (RA is energized to the

timer causes such a shutdown, the OVERLOAD FAIL

closed-contact state by the MODE switch being in NO

switch-indicator lights, indicating that the UUT failed

LOAD position). The input power is also routed to the

the overload testing.

contacts of two other relays within the group labelled

RB in figure FO-1. The normally open side of the

l. Overtemperature protection is activated through

contacts of each of these relays is connected, respec-

overtemperature sensing circuitry. If internal tempera-

tively, to a 1-amp resistive load and to a 4-amp resistive

ture reaches 160F, a 1-minute timer will be activated.

load (labelled resistive loads in figure FO-1). The circui-

At the end of the 1-minute interval, the POWER

try is shown in figure 6-4.

SUPPLY TEST SET OVERTEMP indicator will light

and all loads will be removed from the UUT.

n. PSTS self-test is accomplished when the SELF-

TEST switch is placed in one of its active positions (any

m. When the MODE switch is in the NO LOAD

position except OFF).

position, any function selected by the FUNCTION