6 Starting the Drive
6.1 Pre-start Check List
Table 14: Pre-start Check List
Inspect ✓ Check for
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 routing Check that all cable glands are firmly tightened.
Ensure that motor wiring, brake wiring (if equipped), and control wiring are separated or shiel-
ded, or in 3 separate metallic conduits for high-frequency interference isolation.
Control cables 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 cable or twisted pair and ensure that the shield is terminated correctly.
Input/output cables Check for loose connections.
Check that motor and mains are in separate conduit or separated shielded cables.
Grounding Check for good ground connections that are tight and free of oxidation.
Grounding to conduit, or mounting the back panel to a metal surface, is not a suitable ground-
ing.
Fuses and circuit breakers Check for proper fusing or circuit breakers
Check that all fuses are inserted firmly and are in operational condition and that all circuit break-
ers (if used) are in the open position.
Cooling Look for any obstructions in the airflow path.
Measure top and bottom clearance of the drive to verify adequate airflow for cooling, see the
Cooling Requirements section.
Ambient conditions Check that requirements for ambient conditions are met. See the Ambient Conditions section.
Interior of the drive Inspect that the unit interior is free of dirt, metal chips, moisture, and corrosion.
Verify that all installation tools have been removed from unit interior.
For E3h and E4h enclosures, ensure that the unit is mounted on an unpainted, metal surface.
Vibration Check that the unit is mounted solidly, or that shock mounts are used, if necessary.
Check for an unusual amount of vibration.
Starting the Drive
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707| 65
Danfoss A/S © 2020.01
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