3 Installation
3.5 Electrical Installation
DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com 67
In the case of variable frequency drives with an IP20 degree of protection,
the screen braid can be connected (PES) to the ground potential across a
large area inside the control panel, either with a gland plate or after being
twisted. To prevent EMC interference, this twisted screening connection
should be as short as possible.
In the case of direct local installations (IP66), the screen braid can be
connected in a metallic cable gland and connected to the PE using a
connection cable.
Prevent the screen from becoming unbraided at the other end of the control
cable, e.g. by using a rubber grommet. The screen braid must not make
any connection with the protective ground here because this would cause
problems with an interference loop.
3.5.2.2 Control signal terminals
An 11-terminal terminal strip is used to make the connection in the control
section.
The control signal terminal strip is a plug-in strip and can be used to connect
the cables using screw terminals.
Figure 44: Plug-in control signal terminals
In the case of devices with an IP66 degree of protection and local controls
(DC1-…-A6SN), the local controls (setpoint potentiometer and operating
direction selector switch) will already be wired to the control signal terminal
strip.
Figure 43: Screen braid connection (PES)
(recommended value for the twisted cable screen b 1/ a)
a
b
PES
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