8-5
8.5 Harmonic Component Regulation in the EU
8.5.1 General comments
When general-purpose industrial inverters are used in the EU, the harmonics emitted from inverters to the
power lines are strictly regulated as stated below.
If an inverter whose rated input is 1 kW or less is connected to the public low-voltage power supply, it is
regulated by the harmonics emission regulation IEC/EN 61000-3-2. If an inverter whose input current is above
16 A and 75 A or below is connected to the public low-voltage power supply, it is regulated by the harmonics
emission regulation IEC/EN 61000-3-12.
Note that connection to the industrial low-voltage power lines is an exception. See Figure 8.3.
Medium voltage
The inverter connected here is
subject to the harmonics
regulation. If the harmonics
flowing into the power source
exceeds the regulated level,
permission by the local power
supplier will be needed.
Inverter
Medium-to-
low voltage
transformer
Public low-voltage
power supply
User A
Inverter
The inverter connected
here is not subject to the
harmonics regulation.
User B
User C
Medium-to-low
voltage transformer
Industrial
low-voltage
power supply
Figure 8.3 Power Source and Regulation
8.5.2 Compliance with IEC/EN 61000-3-12
To bring the inverters FRN0006LM2A-4
□
to FRN0091LM2A-4
□
into compliance with IEC/EN 61000-3-12,
install an optional DC reactor and connect the inverters to a power supply whose short-circuit ratio Rsce is 120
or above.
