Internal Filters (Emc And Var Screws) - Eaton PowerXL DA1 Series Installation Manual

3 Installation
3.5 EMC installation

3.5.3 Internal filters (EMC and VAR screws)

3.5.3.1 EMC screws
94
The DA1 variable frequency drives in sizes FS2 and FS3 have two screws on
the left-hand side in protection rating IP20, which are marked with EMC and
VAR; in sizes FS4 and FS5, these screws are on the front.
￫
The EMC screws are found only in devices with an internal RFI
filter in sizes FS2 to FS5 with IP20 protection.
PH1 20 mm (0.79")
M3
L1/L
L2/N
U
L3
EMC VAR

Figure 58: EMC and VAR screw
WARNING
The screw labeled EMC must not be adjusted as long as the
variable frequency drive is connected to the mains.
￫
The EMC screw connects the EMC filter's mains-side
capacitors to earth galvanically. 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.
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).
The local EMC regulations must be taken into consideration for this.
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).
DA1 Variable Frequency Drives 08/18 MN04020005Z-EN www.eaton.com
EMC
VAR