3.3.1 Power and Control Wiring for Unscreened Cables
Induced Voltage!
Run motor cables from multiple drives separately. Induced voltage from output motor cables run together can charge equipment
capacitors even with the equipment turned off and locked out. Failure to run output cables separately could result in death or serious
injury.
Run drive input power, motor wiring, and control wiring in three separate metallic conduits or trays for high frequency noise isolation.
Failure to isolate power, motor, and control wiring could result in less than optimum controller and associated equipment performance.
Because the power wiring carries high frequency electrical pulses, it is important that input power and motor power are run in separate conduit. If the
incoming power wiring is run in the same conduit as the motor wiring, these pulses can couple electrical noise back onto the building power grid. Control
wiring should always be isolated from the high voltage power wiring.
When screened/armoured cable is not used, at least three separate conduits must be connected to the panel option (see figure below).
• Power wiring into the enclosure
• Power wiring from the enclosure to the motor
•Control wiring
Illustration 3.2: Power and control wiring connection
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