3 Installation
3.5 EMC installation
74
DC1…20… and DC1…OE1 Variable Frequency Drives
02/20 MN040059EN
www.eaton.com
All four frame sizes of the variable frequency drives in protection class IP66
have an EMC screw in the housing.
Figure 38:
EMC screw in protection class IP66
In the case of units with a frame size of FS4, the DC link filter (Y class
capacitors) is galvanically connected to the earthing (PE) via the two EMC
screws (motor connection side).
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 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 or there is a
DC link voltage.
￫
The EMC screw galvanically connects the EMC filter’s mains-
side capacitors to the earthing (PE). 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.
NOTICE
In the case of units with a frame size of FS4, both EMC screws
must be either installed or removed, i.e., it is not permissible for
one of them to remain installed while the other one is removed.
1 2 3 4 5
6 7 8 9
10
IOIOI
IOIOI
U V W
L1/L L2/N L3
EMC
EMC
L3
L2/N
L1/L
PZ2
