Use Of Emc-Compatible Cables - Danfoss VLT HVAC Drive FC 102 Design Manual

How to Install
5 5
Figure 5.104 Electrical Connection Diagram, 6-pulse Example

5.7.2 Use of EMC-Compatible Cables

Danfoss recommends braided shielded/armored cables to
optimize EMC immunity of the control cables and the EMC
emission from the motor cables.
The ability of a cable to reduce the incoming and
outgoing radiation of electric noise depends on the
transfer impedance (Z
designed to reduce the transfer of electric noise; however,
a shield with a lower transfer impedance (Z
effective than a shield with a higher transfer impedance
(Z ).
T
Transfer impedance (Z
turers, but it is often possible to estimate transfer
impedance (Z
cable.
Transfer impedance (Z
following:
•
The conductibility of the shield material.
•
The contact resistance between the individual
shield conductors.
170
). The shield of a cable is normally
T
) is rarely stated by cable manufac-
T
) by assessing the physical design of the
T
) can be assessed by the
T
Danfoss A/S © Rev. 2014-01-13 All rights reserved.
Design Guide
•
•
Figure 5.105 Cable Types
a
b
c
d
) value is more
T
e
f
g
Table 5.83 Legend to Figure 5.105
The shield coverage, which is the physical area of
the cable covered by the shield, often stated as a
percentage value.
Braided or twisted shield type.
Aluminum-clad with copper wire.
Twisted copper wire or armored steel wire cable.
Single-layer braided copper wire with varying
percentage shield coverage.
This is the typical Danfoss reference cable.
Double-layer braided copper wire.
Twin layer of braided copper wire with a magnetic,
shielded/armored intermediate layer.
Cable that runs in copper tube or steel tube.
Lead cable with 0.43 in [1.1 mm] wall thickness.
MG16C122