LSIS 6731001500, User Manual

Page: 56 / 659

43
Installing
the Inverter
Step 6 Disabling the EMC Filter for Power Sources with Asymmetrical Grounding
H100, 400 V 0.75–55 kW, 110~500kW(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.