Power And Control Wiring For Unscreened Cables - Danfoss VLT FC 102 Operating Instructions Manual

Electrical Installation
4.7.3 Power and Control Wiring for
Unscreened Cables
WARNING
INDUCED VOLTAGE
Induced voltage from coupled output motor cables
charges equipment capacitors even with the equipment
turned off and locked out. Run motor cables from
multiple frequency converters separately. Failure to run
output cables separately could result in death or serious
injury.
CAUTION
COMPROMISED PERFORMANCE
The frequency converter runs less efficiently if wiring is
not isolated properly. To isolate high frequency noise,
place the following in separate metallic conduits:
•
Power wiring
•
Motor wiring
•
Control wiring
Failure to isolate these connections could result in less
than optimum controller and associated equipment
performance.
Because the power wiring carries high-frequency electrical
pulses, it is important to run input power and motor
power in separate conduit. If incoming power wiring is in
the same conduit as motor wiring, these pulses can couple
electrical noise back onto the power grid. Isolate control
wiring from high-voltage power wiring. See Illustration 4.4.
When screened/armoured cable is not used, at least 3
separate conduits are connected to the panel options
cabinet.
MG16I302
Operating Instructions
Stop
Start
Speed
Illustration 4.4 Example of Proper Electrical Installation Using
Conduit
Danfoss A/S © 04/2015 All rights reserved.
Line Power
Control
4 4
Motor
41