Load Connection - Method Iv (Parallel/Redundant Operation) - KEPCO HSM 3.3-230 Operator's Manual

2.7.5.4

LOAD CONNECTION - METHOD IV (PARALLEL/REDUNDANT OPERATION)

Identical HSM power supply models may be connected in parallel in order to provided increased
output current to a common load (see Figure 2-6). This permits the user to obtain significantly
higher load ratings than for a single HSM power supply. The number of power supplies required
is determined by dividing the required load current by the current rating of the applicable HSM
model, and rounding up to the next whole number when necessary. HSM power supplies incor-
porate fault detection circuitry which precludes the need for output blocking diodes, and utilize
active current sharing circuitry to distribute the load current equally among the paralleled units.
Redundant operation is achieved by paralleling one or more power supplies than the minimum
number required to support the load; in this way, system operation is not compromised by the
failure of a single power supply. Any number of HSM power supplies (N+M) can be wired for
redundant operation as long as (N) power supplies can support the load, M representing the
total number of failed power supplies. When operating HSM power supplies in any parallel con-
figuration, load sharing must be implemented among the paralleled modules; this is required for
proper operation of the fault detector (see PAR. 2.7.6).
FIGURE 2-6. LOAD CONNECTION - METHOD IV (PARALLEL/REDUNDANT OPERATION WIT HOT SWAP
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HSMSERIES OPR 052912