Emc-Compatible Electrical Installation - Danfoss CDS803 Quick Manual

Quick Guide

1.3.8 EMC-compatible Electrical Installation

General points to be observed to ensure EMC-compatible electrical installation.
•
Use only shielded/armored motor cables and shielded/armored control cables.
•
Connect the shield to ground at both ends.
•
Avoid installation with twisted shield ends (pigtails), since this ruins the shielding effect at high frequencies. Use
the cable clamps provided instead.
•
Ensure the same potential between adjustable frequency drive and ground potential of PLC.
•
Use starwashers and galvanically grounding plates.
Line power supply
L1
L2
L3
PE
Reinforced protective ground
Figure 1.8 EMC-compatible Electrical Installation
For North America, use metal conduits instead of shielded cables.
MG18M122
Quick Guide
Panel
PLC etc.
PLC
Min. 0.0248 in 2 [16 mm 2 ]
Equalizing cable
Control cables
Min. 7.9 in [200 mm]
between control
cable, line cable
and between line power
motor cable
Danfoss A/S © Rev. 08/2014 All rights reserved.
Output con-
tactor, etc.
Grounding rail
Cable insula-
tion stripped
All cable entries in
one side of panel
Motor cable
Motor, 3 phases and
Protective ground
1 1
9