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VLT® AutomationDrive FC 302
Operating Guide
6 Pre-start Check
6.1 Pre-start Check List
Motor
•
Confirm continuity of the motor by measuring ohm values on U–V (96–97), V–W (97–98), and W–U (98–96).
•
Confirm that the supply voltage matches the voltage of the drive and the motor.
Switches
•
Ensure that all switch and disconnect settings are in the proper positions.
Auxiliary equipment
•
Look for auxiliary equipment, switches, disconnects, or input fuses/circuit breakers that reside on the input power side of the
drive or output side to the motor. Ensure that they are ready for full-speed operation.
•
Check function and installation of any sensors used for feedback to the drive.
•
Remove any power factor correction caps on the motor.
•
Adjust any power factor correction caps on the mains side and ensure that they are dampened.
Cable/wire routing
•
Ensure that motor wiring, brake wiring (if equipped), and control wiring are separated, shielded, or in 3 separate metallic
conduits for high-frequency interference isolation.
Control wiring
•
Check for broken or damaged wires and loose connections.
•
Check that control wiring is isolated from high-power wiring for noise immunity.
•
Check the voltage source of the signals, if necessary.
•
Use shielded or twisted pair cable.
•
Ensure that the shield is terminated correctly.
Input and output power wiring
•
Check for loose connections.
•
Check that motor and mains are in separate conduit or separated shielded cables.
Grounding
•
Make sure that a proper ground is used. Grounding to conduit or mounting the back panel to a metal surface is not a suitable
grounding.
•
Check for good ground connections that are tight and free of oxidation.
Fuses and circuit breakers
•
Check for proper fusing or circuit breakers.
•
Check that all fuses are inserted firmly and are in operational condition.
•
Check that all circuit breakers (if used) are in the open position.
Cooling clearance
114 | Danfoss A/S © 2021.10
Pre-start Check
AQ262139143212en-000301 / 130R0879
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Troubleshooting
