18
Wiring the Drive
•
At least three separate METALLIC conduits must be connected
to the drive
– Power into the drive [L1, L2, L3 and a ground back to the
distribution panel]
– Power from the drive to the motor [U, V, W, and PE (power
earth ground)]
– Control wiring
•
A dedicated ground wire is needed
At least three separate conduits must be connected to the drive. One is for the incoming
power wiring, one is for the power 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 or the high voltage output power wiring from the drive to the motor.