3 Installation
3.5 EMC installat ion
86 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
3.5.3 Internal filters (EMC and VAR screws)
3.5.3.1 EMC screw
FS2 and FS3 DA1 variable frequency drives with an IP20 degree of protection
feature two screws on the left side that are labeled EMC and VAR.
Figure 52:EMC and VAR screw
Due to their system characteristics, variable frequency drives with an internal
EMC filter will produce a larger fault current to earth than devices without a
filter. 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-EMC...-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).
NOTICE
The screw labeled EMC must not be manipulated as long as the
variable frequency drive is connected to the mains.
￫
The EMC screw galvanically connects the EMC filter’s mains-
side capacitors to earth. The screw must be screwed in all the
way to the stop (factory setting) in order for the variable
frequency drive to comply with EMC standards.
EMC
L3
U
L2/N
L1/L
VAR
PH1
M3
20 mm (0.79")
EMC
VAR
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