KEPCO HSF 600W Series (suffix A and AM) Operator Manuals - Manual (Page 17)

HSF(A) 600W 101013
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3.8 LOCAL/REMOTE SENSING
HSF (A, AM) 600W Power Supplies allow remote error sensing which can compensate up to 0.4
Volts per load wire. Local/Remote error sensing is configured by means of separate DIP switches
mounted on the RA 19-4C Rack Adapter (see RA 19-4C Rack Adapter Operator Manual). Either
local or remote sensing MUST be used, otherwise the units will not operate.
3.9 RETAINING LATCHES
HSF (A, AM) 600W series power supplies are provided with (2) retention latches located at each
side of the bottom edge of the front panel (see Figure 5). These latches work in conjunction with
the RA 19-4C rack adapters to prevent unauthorized or inadvertent module extraction from an
operating power system. The latch is engaged by loosening the cap-head screw approximately 1/
2 turn CCW (use 5/32” hex key) and sliding the latch down to the bottom of the slot, then retight-
ening the cap-head screw CW until snug. DO NOT OVERTIGHTEN! To release, follow the same
procedure, except lift the latch to the top of the slot. Be sure to move the latch completely up or
down to ensure full engagement and disengagement of the latching mechanism. When the HSF A
power supply is not installed in its plug-in rack adapter, it is recommended that the latch be
secured in the open (up) position to prevent damage.
NOTE: Retaining latches must not be used to secure the HSF A power supply in the rack
adapter for shipping purposes.
4. LOAD CONNECTION
Connect the load to (+) and (–) terminals at the rear panel of the Rack Adapter (see RA 19-4C
Instruction Manual for details).
5. CONNECTING MULTIPLE POWER SUPPLIES
All connections to multiple HSF (A, AM) power supplies must be made via the I/O mating connec-
tors at rear of the Rack Adapter or by the Rack Adapter DIP switches. These connections, includ-
ing the configuration of the two internal HSF (A, AM) DIP switches, are described in the Rack
Adapter Instruction manual, and include:
• Using one power supply to control the output of multiple supplies.
• Using parallel master/slave configurations (for increased current or redundancy) where
the user either predetermines the master or allows the load to determine which is the
master. These configurations also cover the use of the Current Balancing feature of the
HSF (A, AM) power supply.
• Using series configurations (for increased voltage).
• Using open-on-fail or close-on-fail alarm schemes with multiple power supplies.
NOTES: 1. To enable current share, the difference between voltage settings of parallel con-
nected units should be less than 0.5% of the nominal voltage value of the units.
Output voltage adjustment should be done at same load for each unit.
2. An overshoot of about 1% of nominal voltage occurs upon power up of each unit.
When powering up with no load, overshoot may last up to 15 seconds and alarm
may be temporarily triggered on one of the other parallel-connected units.
3. Load effect specifications will not be met when units are operated in redundant
mode with load less than 10% per unit.
4. Minimum Load. A minimum load is required to operation without voltage set
restrictions (see Note 5, below). The minimum load is defined as:
minimum load (Amperes) = N x (I/10)
where N = the number of units in parallel,
I = Nominal current rating of individual power supply (Amperes).