Step 6 Disabling the EMC Filter for Power Sources with Asymmetrical
Grounding
S100 built-in EMC filter prevents electromagnetic interference by reducing radio emissions
from the inverter. EMC filter is activated as a factory default design. If an inverter uses a
power source with an asymmetrical grounding connection or non-grounding, the EMC filter
MUST be turned off. EMC filter use is not always recommended, as it increases leakage
current. Refer to Product Identification on page 1 to check if inverters have built-in EMC
filters.
S100, 400 V, 55-75 kW products do not have built-in EMC filters.
Asymmetrical Grounding Connection
One
phase of a
delta
connectio
n is
grounded
Intermediate
grounding
point on one
phase of a
delta
connection
The end of
a single
phase is
grounded
A 3-phase
connection
without
grounding
• Do not activate the EMC filter if the inverter uses a power source with an asymmetrical
grounding structure, 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.
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