Unscreened Control Wires - Danfoss VLT AAF006 Operating Instructions Manual

Electrical Installation
4. Remove the screwdriver. The cable is now
mounted in the terminal.
To remove the cable from the terminal:
1. Insert a screwdriver (maximum 0.4x2.5 mm) in the
square hole.
2. Pull out the cable.

4.2.15 Unscreened Control Wires

CAUTION
INDUCED VOLTAGE
Run input power and control wiring in separate metallic
conduits or raceways for high-frequency noise isolation.
Failure to isolate power and control wiring could result
in less than optimum controls and associated equipment
performance.
Isolate control wiring, including CT wires, from the high-
voltage power wiring. When screened/armoured cable is
not used, ensure that control wires are twisted pairs and
keep the maximum possible distance between mains wire
and control cables.
Long control cables and analog signals may result in 50/60
Hz ground loops due to noise from mains supply cables.
If ground loops occur, break the screen or insert a 100 nF
capacitor between screen and chassis, if needed.
PNP (Source)
Digital input wiring
12 13 18 19 27
Illustration 4.20 Input Polarity of Control Terminals, PNP
MG90V302
Operating Instructions
29 32 33 20 37
Danfoss A/S © 09/2014 All rights reserved.
NPN (Sink)
Digital input wiring
12 13 18 19 27
Illustration 4.21 Input Polarity of Control Terminals, NPN
NOTICE
To comply with EMC emission specifications, use
screened/armoured cables. If using unscreened control
cables, use ferrite cores to improve EMC performance.
Connect the shields in a proper way to ensure optimum
electrical immunity.
Illustration 4.22 Connecting Shielded Control Cables
29 32 33 20 37
27
4 4