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VLT Ea4 Parallel Drive Modules
Operating Guide
6 Operating the Drive
6.1 Pre-start Check List
Table 8: Pre-start Check List
Inspect
Motor
Switches
Auxiliary equipment
Cable routing
Control cables
Input/output cables
Grounding
Fuses and circuit break-
ers
Cooling
Ambient conditions
Interior of the drive
36 | Danfoss A/S © 2023.01
Check for
✓
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.
Ensure that all switch and disconnect settings are in the proper positions.
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 capacitors installed between the drive and the motor.
Adjust any power factor correction capacitors on the mains side and ensure that they are damp-
ened.
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.
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.
Check for loose connections.
Check that motor and mains are in separate conduit or separated shielded cables.
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.
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.
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.
Check that requirements for ambient conditions are met. See the Ambient Conditions section.
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.
Operating the Drive
AQ434333248451en-000101 / 130R1286
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