l
Suppressing Harmonic Current
T
o suppress the power supply harmonic current that flows to a low-voltage distribution sys-
tem, a power supply unit or an active filter as described below should be installed between a
device and the low-voltage distribution system:
• A power supply unit that can suppress the power supply harmonic current, such as a high
power factor inverter-type uninterruptible power unit
• An active filter unit for suppressing the power supply harmonic current
For Europe, you must select a power supply unit that can meet the requirements on the limits
for harmonic current emissions of the EMC Directives.
Aside from determining the output capacity of the power supply unit, you should also deter-
mine the capacity of the harmonic current suppressing unit after consultation with the supplier
of your power supply unit.
xiv
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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