KEPCO HSF 300W Series (no suffix, suffix M and MZ) Operator Manuals - Manual (Page 18)

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HSF (M) 300W 030413
5.3.1 MINIMUM LOAD
The minimum load (Amperes) = N x (I/10) where N = the number of units in parallel, I = Nominal
current rating of individual power supply (Amperes). For applications requiring no load or lower
than minimum load conditions, see voltage set restrictions of PAR. 5.3.2. Load effect specifica-
tions will not be met when units are operated in redundant mode with load less than 10% per unit.
For loads less than 10%, voltage stabilization may be affected if units are turned off and on via the
front panel, causing voltage on the paralleled bus to rise as high as 8% for 5 seconds maximum.
This can be avoided by using the remote on-off feature to turn the units off and on.
5.3.2 VOLTAGE SET RESTRICTIONS
To avoid slave “idle” all parallel-connected units’ output voltage must be set within 1% or 200mV
of each other (whichever is lower) and be at least 80% of their nominal (rated) output voltage
(90% for 48V model).