Step 6 Disabling the EMC Filter for Power Sources with Asymmetrical Grounding
S100, 400 V 30–45 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.
S100, 400 V, 55- 75 kW products do not have built-in EMC filters.
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.
To Next Page
Loading...
Need help?
General
