Motor Connection - Danfoss FC 102 Design Manual

Electrical Installation
6 6
Illustration 6.11 Mains Connection Enclosure Types C1 and C2
(IP21/NEMA Type 1 and IP55/66/NEMA Type 12).
Illustration 6.12 Mains Connection Enclosure Type C3 (IP20).
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Design Guide
91
92
93
L1
L2
L3
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Danfoss A/S © Rev. 06/2014 All rights reserved.
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Illustration 6.13 Mains Connection Enclosure Type C4 (IP20).
Usually the power cables for mains are unscreened cables.

6.1.4 Motor Connection

NOTICE
To comply with EMC emission specifications, screened/
armoured cables are required. For more information, see
chapter 2.9.2 EMC Test Results.
See chapter 9 General Specifications and Troubleshooting for
correct dimensioning of motor cable cross-section and
length.
Screening of cables:
Avoid installation with twisted screen ends (pigtails). They
spoil the screening effect at higher frequencies. If it is
necessary to break the screen to install a motor isolator or
motor contactor, the screen must be continued at the
lowest possible HF impedance.
Connect the motor cable screen to both the decoupling
plate of the frequency converter and to the metal housing
of the motor.
Make the screen connections with the largest possible
surface area (cable clamp). This is done by using the
supplied installation devices in the frequency converter.
If it is necessary to split the screen to install a motor
isolator or motor relay, continue the screen with the
lowest possible HF impedance.
MG11BC02