ELECTRICAL INSTALLATION
Wiring Guidelines
18
ELECTRICAL INSTALLATION
Wiring Guidelines
Follow the recommendations in this section to ensure best performance of the SubDrive Utility and to avoid
interference with other devices.
Cable Routing
Use the above diagram as a guide when routing wiring to VFD.
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
“Branch Circuit Protection” on page 19
.
3. Route motor wiring out of building as soon
as possible. Separate input power and
motor wiring by at least 8 in. (20.3 cm).
Refer to
“Output (Motor) Wire Sizing” on
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
in. (20.3 cm).
5. All control wiring—sensors, switches, trans
-
ducers, etc.—should be in a separate con
-
duit routed individually, not parallel, from
high voltage wiring. In addition, any
shielded cables should be properly
grounded.
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 unexpected 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 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, make sure to check the integrity of power and motor leads. This requires
measuring the insulation resistance with a suitable megohm-meter.
2
1
3