6 Pre-start Check List
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 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 or 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
• Look for any obstructions in the airflow path.
• Measure top and bottom clearance of the drive to verify that there is at least 225 mm (9 in) of clearance for adequate airflow.
Pre-start Check List
Operating Guide | VLT® AQUA Drive FC 202
AQ262141056213en-000101 / 130R0882 | 99
Danfoss A/S © 2018.10
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