3 Installation
3.3 EMC installation
DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com 55
Figure 32: Setup designed to meet EMC requirements with IP66 degree of protection
a Power cable: mains voltage, motor connection, braking resistance
b Control and signal lines, fieldbus connections
Cable screen of cables at variable frequency drive’s output with earth potential (PES) across large surface
area
Large-area cable screen contacts with motor.
Large-area earth connection of all metallic parts.
3.3.2 EMC screw
Figure 33: EMC and VAR screws in a DC1 variable frequency drive
with degree of protection IP20
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 neces-
sary, a specific low-leakage-current EMC filter 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.
￫
The EMC screw (in DC1-…-A20N models only) galvanically
connects the EMC filter's 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 the EMC stan-
dard.
VAR
EMC
EMC
L3
U
L2/N
L1/L
VAR
PH1
M3
20 mm (0.79")
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