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ELECTRICAL INSTALLATION
Wiring Guidelines
NOTICE
Risk of damage to VFD, or malfunction can occur.
•
Follow all wire routing and grounding instructions carefully. Inductive currents caused by
parallel wiring, or close proximity between high voltage and control wiring can cause un-
expected behaviors.
•
Do not run input power and motor wires in the same conduit.
•
Do not run motor wires from multiple VFDs in common conduit.
•
Do not run control wiring parallel with high voltage wiring.
•
Do not run VFD wiring parallel with building or facility wiring.
•
Do not use aluminum wires for VFD connections.
•
Do not run any wiring through the airflow channel in the back of the drive.
•
Do not install a magnetic contactor or disconnect in the motor circuit.
•
Do not use with a Ground Fault Circuit Interrupter (GFCI).
•
Do not leave wire fragments, metal shavings or other metal objects inside the VFD.
•
Improper splicing or damage to motor cable insulation may expose the conductor(s) to
moisture and can produce motor cable failure.
•
For retrofit application, check the integrity of power and motor leads. This requires meas-
uring the insulation resistance with a suitable megohm-meter.
Cable Routing
Use the following diagram as a guide when routing wiring to VFD.
IMPORTANT: All control wiring—sensors, switches, transducers, etc.—should be in a separate conduit
routed individually, not parallel, from high voltage wiring. In addition, any shielded cables should be
properly grounded.
1.
Mount the drive as close as possible
to the service entrance panel. Wire
directly to the service entrance. Do
not connect to a sub-panel.
2. Use a dedicated branch circuit for
the drive. Refer to
"Input (Power)
Wire and Fuse Sizing" on page
3. Route motor wiring out of building
as soon as possible to reduce the
chance of EMI or electrical interfer-
ence on the motor cables. Separate
input power and motor wiring by at
least 8 inches (20.3 cm). Refer to
"Output (Motor) Wire Sizing" on
page
21.
4. Cross over other branch circuits and
facility wiring at a 90° angle. If it is
necessary to run wiring in parallel,
separate by at least 8 inches (20.3
cm).
20.
ELECTRICAL INSTALLATION
Wiring Guidelines
19
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