Step 6 Disabling the EMC Filter for Power Sources with Asymmetrical
Grounding
H100, 400 V 0.75–55 kW (3 phase) inverters have EMC filters built-in and activated as a
factory default design. An EMC filter prevents electromagnetic interference by reducing
radio emissions from the inverter. EMC filter use is not always recommended, as it
increases leakage current. If an inverter uses a power source with an asymmetrical
grounding connection, the EMC filter must be turned off.
Asymmetrical Grounding Connection
One phase of
a delta
connection is
grounded
(TN Systems)
Intermediate
grounding
point on one
phase of a
delta
connection
(TN
Systems)
The end of a
single phase
is grounded
(TN Systems)
A 3-phase
connection
without
grounding
(TN
Systems)
• Do not activate the EMC filter if the inverter uses a power source with an asymmetrical
grounding structure(corner-earthed systems), for example a grounded delta connection.
Personal injury or death by electric shock may result.
• Wait at least 10 minutes before opening the covers and exposing the terminal connections.
Before starting work on the inverter, test the connections to ensure all DC voltage has been
fully discharged. Personal injury or death by electric shock may result.
Before using the inverter, confirm the power supply‘s grounding system. Disable the EMC
filter if the power source has an asymmetrical grounding connection.
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