Screened Cables; Suppression Of Inductive Loads; Insulation Voltage Test - Pilz PSS Series Installation Manual

Screened cables

Interference currents arising from electrical, magnetic or electromagnetic
fields of interference must be diverted to cable screens via the earth bars
connected to the enclosure. Please remember the following:
• Connect the screens with low impedence to the earth conductor.
• Use cables with braided screening, with a minimum cover area of 80%.
• For high frequency areas connect the screen at both ends.
• For low frequency areas connect the screen at one end; this is also valid
when laying cables without equipotential bonding or using foil screens.
• Use metal or metallised plugs to connect cables for serial data transfer.
• The screen must have no connection to the connector housing if it is not
located at the end of the cable.
• At the point where the cable enters the cabinet, connect the screen to
the earth bar, without making a break in the cable. Use metal cable
clamps which cover the screen over a wide surface area.
Take the screen as far as the module, but do not lay it on top of the
module

Suppression of inductive loads

Suppression should not be used to protect the semiconductor outputs.

Insulation voltage test

The PSS systems from the PSS 3056 series are connected to the
functional earth through protective elements on the supply voltage.
Insulation voltage tests can only be carried out with voltages up to
approximately 42 V.
Installation Manual: PSS 3056 Series
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