KEPCO HSF-1UR 50W Series Operator Manual - Manual (Page 4)

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228-1563 REV 10 083013
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
http://www.kepcopower.com email: [email protected]
CONNECTIONS: The 24-pin I/O connector (Figure 3)
is designed to mate with the corresponding connector in
the RA 19-1U Rack Adapter.
(+) SENSE, (–) SENSE: These lines are provided to com-
pensate for voltage drops in the load connecting wires.
The Sense lines must be connected to their respective (+)
and (–) output terminals, either at the load or at the rack
adapter (see Rack Adapter Manual). The connection
ensures the most accurate error tracking. Error compen-
sation in the connecting wires is up to 0.25 Volts per lead
for all models.
NOTE:
The Sense lines must be connected for the
HSF-1UR Power supply to work properly!
OUTPUT (+), OUTPUT (–): HSF-1UR power supply d-c out-
put.
CURRENT SHARE BUS (CSB): Connecting the CSB lines
of HSF-1UR power supplies operating in a parallel config-
uration causes output current to be shared equally. (See
Rack Adapter Manual for additional information on parallel
configurations.). For current sharing to work properly the
outputs of all paralleled units must be within 250 mV (max)
of each other and each unit must be operating at between
10% to 100% of rated output. If current to the load goes
below 10% for each unit in current share mode, all MAS-
TER ON lights may go on (see load effect specifications);
this indicates that forced current share is no longer work-
ing, units are simply in current share mode. (If forced cur-
rent sharing at less than 10% nominal current per supply
is needed, contact Kepco application engineering.)
Remote sensing is recommended. For master/slave oper-
ation to work properly each unit should be adjusted to 40
mV (optimum) less than the next paralleled unit (unit 1 is
adjusted to VOUT, unit 2 to VOUT – 40mV, and unit 3 to
VOUT – 80mV, etc. If the master fails, the unit 2 will
become the new master). The 40 mV difference can be
reduced to a minimum of 25 mV as needed to parallel
many units and still keep all units within 250 mV of each
other. Adjust the outputs using Vadj trimmer on front
panel.
• Optimum difference among output voltages of
paralleled units: 40mV
• Maximum difference among output voltages of
paralleled units: 250 mV
• Minimum difference among output voltages of
paralleled units: 25 mV
NOTE: Current share requirements stated above may be
extended to units located in adjacent racks.
ALARM: The Alarm NC (normally closed) - Open on Fail-
ure and Alarm NO (normally open) - Close on Failure lines
are relay contacts referenced to Alarm Common. If the
unit fails, the path between Alarm NC - Open on Failure
and Alarm Common opens, the path between Alarm NO -
Close on Fail and Alarm Common is a short circuit. Figure
4 illustrates typical Close on Fail and Open on Fail circuits
to give a failure indication if any one of a number of power
supplies fail.
INPUT POWER: Line (either a-c or d-c source power), Neu-
tral and Ground (chassis)
FIGURE 4. TYPICAL ALARM CIRCUIT DIAGRAMS