H. Various internal components such as the preload resistors
(6, Fig. 3),
main transformer
(1, Fig. 3),
filter capacitors
(4, Fig. 3)
with the bus bar
(5, Fig. 3)
at the front, filter reactor
(7, Fig. 3),
two
(8, 9,
Fig. 3)
output contactor, control transformer
(10, Fig. 3),
and printed circuit control board
(13, Fig. 3),
input contactor
(14, Fig. 3),
etc.
CAUTION: CAPACITOR CHARGE CAN INJURE! ALLOW CAPACITORS TO DISCHARGE AND
VERIFY CAPACITOR DISCHARGE WITH VOLTMETER BEFORE TOUCHING THE CAPACITOR
CIRCUITRY.
2. Special Features
This DC ground power supply has the following special features which may be described more fully, if re-
quired, in the detailed description:
A. Output Ammeter, M1,
(2, Fig. 4)
with a 0-2000 A DC scale for reading the DC output amperes. The
signal is provided by R11 meter shunt
(20, Fig. 3).
B. Output Voltmeter, M2,
(3, Fig. 4)
having a 0 to 50 V DC scale reading the DC output voltage.
C. Input contactor,
(14, Fig. 3)
with amber input contactor on-off light
(12, Fig. 4)
D. 28-V DC contactor
(8, 9, Fig. 3)
with green output contactor on-off light
(13, Fig. 4).
E. Solid state closed loop feedback output voltage control to compensate for brown-outs and load re-
lated power supply voltage droop.
F. Output overvoltage
(31.5 V DC)
and overcurrent turn off circuitry and turn on DS2 trip light.
G. Adjustable solid state output limit circuitry. The customer selects the momentary output limit in the
250 to 2000 A DC range by adjusting the R13 starting current potentiometer
(8, Fig. 4).
A preset volt-
age slope circuit causes a 25 percent drop in output voltage from 600 A DC to 1600 A DC output cur-
rent.
CAUTION: EXCESSIVE CHARGING CURRENT CAN DAMAGE SOME TYPES OF BATTERIES
AND SOME OTHER LOADS. IF THE 250 A DC “STARTING SURGE” LEVEL IS TOO HIGH FOR
YOUR PARTICULAR LOAD, CONTACT THE MANUFACTURER FOR RECOMMENDATIONS.
H. Auxiliary power receptacle
(5, Fig. 4)
with weather protection cover
(7, Fig. 4)
On the 60-Hz model,
this is a duplex receptacle rated at 115 V AC, 9-amperes, single phase. On the 50-Hz model, this is a
single output rated at 220 V AC, 15-amperes, single phase.
J. Thermal overload thermostat
(3, Fig. 5)
which turns off the output voltage when the SCR heatsink
overheats.
OM-2010
April 10/89 Revised 2-1
Page 3
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