terminals to their associated C terminals.
power source, connect six jumper leads on the tap board
Note. The ac power input electrical connections are made by
authorized installation personnel and should be protected with a
(1) Jumper leads from each of the three S
fuse and controlled by an external switch for convenient removal
terminals to their associated L1 440V, L2
of power from the power supply during maintenance.
440V, and L3 440V terminals.
c. Connect the four-wire ac input power cable to the
(2) Jumper leads from each of the three 5
ac power input source.
Section II. OPERATION
2-4. Controls and lndicators
2-5. Operating Procedure
The following chart lists the power supply controls
After performing the input power connection pro-
and indicators and their functions:
a. Set the VOLTAGE ADJUST switch to NOM.
b. Connect the dc output cable to the equipment to
Control or indicator
Turns power supply on and off
POWER ON circuit breaker
c. Set the POWER ON circuit breaker switch to
manually. Provides overload
protection by automatically dis-
d. Check to see that the DIRECT CURRENT
connecting ac input power
whenever input current is exces-
VOLTS meter indicates 28 volts. lf the voltage indicated
is less than 28 volts, set the VOLTAGE ADJUST switch
When illuminated, indicates that
to HIGH. If the voltage indicated is greater than 28
input power is applied to power
volts, set the VOLTAGE ADJUST switch to LOW.
e. Depress the AMMETER switch to READ and see
VOLTAGE ADJUST switch
Permits adjustment of output
voltage if input voltage is high
that the DIRECT CURRENT AMPERES meter
indicates output current (200 amperes maximum).
inal dc output
of 28 volts.
2-6. Stopping Procedure
Stop the power supply as follows:
W h e n depressed, DIRECT
CURRENT AMPERES meter
a. Set the equipment being powered to off.
indicates power supply output
b. Set the POWER ON circuit breaker switch to the
off (down) position.
Indicates output voltage.
c. Disconnect the dc output cable from the equip-
ment being powered and rewind the dc output cable on
Indicates output current.
the brackets on the front of the power supply.