Danfoss VLT 6000 HVAC Wartungshandbuch PDF herunterladen (Seite 55)

VLT

6000 HVAC

55MG.60.B1.02 - VLT is a registered Danfoss trade mark

Installation

■■

■ Use of EMC-correct cables

Screened/armoured cables are recommended to

optimise EMC immunity of the control cables and the

EMC emission from the motor cables.

The ability of a cable to reduce the in- and outgoing

radiation of electric noise depends on the switching

impedance (Z

). The screen of a cable is normally

designed to reduce the transfer of electric noise;

however, a screen with a lower Z

value is more

effective than a screen with a higher Z

. Z

is rarely

stated by cable manufacturers, but it is possible to

estimate Z

by looking at the cable and assessing its

physical design.

can be assessed on the basis of the following

factors:

- The contact resistance between the individual

screen conductors.

- The screen coverage, i.e. the physical area of the

cable covered by the screen - often stated as a

percentage value. Should be min. 85%.

- The screen type, i.e. braided or twisted pattern. A

braided pattern or a closed tube is recommended.

Aluminium-clad with

copper wire.

Twisted copper wire or

armoured steel wire cable.

Single-layer braided copper

wire with varying percentage

screen coverage.

Double-layer braided

copper wire.

Twin layer of braided copper wire

with a magnetic, screened/armoured

intermediate layer.

Cable that runs in copper

tube or steel tube.

Lead cable with 1.1 mm wall

thickness with full coverage.

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