Step 6 Disabling the EMC Filter for Power Sources with Asymmetrical Grounding
EMC filter is built in the next two products. S100 200V single-phase built-in EMC filter and the 400V
class. 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
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.
Before using the inverter, confirm the power supply’s grounding system. Disable the EMC filter if
the power source has an asymmetrical grounding connection. Refer to the figures below to locate
the EMC filter on/off terminal and replace the metal bolt with the plastic bolt. If the EMC filter is
required in the future, reverse the steps and replace the plastic bolt with the metal bolt to
reconnect the EMC filter.
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