Power And Control Wiring For Unscreened Cables - Danfoss VLT FC 302 Operating Instructions Manual

Installation
3.4.10 Power and Control Wiring for
Unscreened Cables
WARNING
INDUCED VOLTAGE
3 3
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.
When screened/armoured cable is not used, at least 3
separate conduits are connected to the panel options
cabinet (see Illustration 3.20).
28
Operating Instructions
Danfoss A/S © Rev. 2014-07-29 All rights reserved.
Stop
Start
Line
Speed
Power
Control
Illustration 3.20 Proper Electrical Installation Using Conduit
Motor
Separate Conduit
MG37A202