3 Installation
3.5 EMC installation
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
www.eaton.com
59
For applications in which this larger leakage current may cause malfunction
messages or disconnections (residual current device), the EMC filter’s
internal protective earth can be disconnected (remove the EMC screw to do
this).
Local EMC regulations must be taken into account when doing so.
If necessary, a specific low-leakage-current EMC filter (DX-EMC12…-L) must
be connected upstream.
In connections to isolated power sources (IT networks), the EMC and VAR
screw should be removed. The earth fault monitors required for IT networks
must be suitable for operation with power electronic devices (IEC 61557-8).
3.5.3.2 VAR screw
DC1-S… variable frequency drives with a frame size of FS1 or FS2 and an
IP20 degree of protection are equipped with an overvoltage filter for the
input supply voltage. This overvoltage filter is designed to protect the devices
from noise pulses and high voltage magnitudes in the mains voltage.
Pulse spikes are typically caused by lightning strikes or by switching
operations in other high-power devices on the same supply.
If high potential tests are performed on a system, these overvoltage
protection components may cause the system to fail the test. In order to
make it possible to perform this type of hipot tests, the overvoltage
protection components can be disconnected by removing the VAR screw.
The screw must be screwed back in after the high potential tests are
performed and the test must then be repeated. The system must then fail
the test, indicating that the overvoltage protection components have been
reconnected.
NOTICE
The screw labeled VAR (
gure 34, page 58) must not be
manipulated as long as the variable frequency drive is
connected to the mains or there is a DC link voltage.
Summary of Contents for PowerXL
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