Danfoss VLT Training Manual page 34

VLT Installation
5) Wiring
5) Wiring the Drive
a. General Practices
At least three separate conduits must be connected to the drive. One is for the
incoming power wiring, one is for the motor output wiring between the drive and the
controlled motor, and the third is for the control wiring.
Because the wiring from the drive to the motor carries high frequency electrical
pulses, it is important to be sure that no other wires are run in this 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's power grid.
Control wiring should always be isolated from the high voltage input power wiring to
the drive and the high voltage output power wiring from the drive to the motor.
A fourth conduit may be required if using pilot duty or control voltage (48 - 240Vac)
to the auxiliary relay (terminals 01, 02, and 03).
Rev.02
a. General Practices
General Wiring Practices
At least three separate METALLIC conduits must be
connected to the drive
• Incoming Power to the drive [L1, L2, L3 and a ground
back to the distribution panel]
• Outgoing Power to the motor [U, V, W, and PE -
power earth ground]
• Control wiring
• A dedicated ground wire is needed
• Check Torque required for connectors
Confidential / Property of Danfoss Drives A/S
32
North America
Motion Controls