4 Start Up and Functional Testing
4.1 Pre-start
CAUTION
Before applying power to the unit, inspect the entire installation as detailed in Table 4.1. Check mark those items when
completed.
Inspect for Description
☑
Auxiliary equipment
•
Look for auxiliary equipment, switches, disconnects, or input fuses/circuit breakers on the input
power side of the frequency converter 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 frequency converter.
•
Remove power factor correction caps on motors, if present.
Cable routing
•
Use separate metallic conduits for each of the following:
-
Input power
-
Motor wiring
-
Control wiring
Control wiring
•
Check for broken or damaged wires and loose connections.
•
Check that control wiring is isolated from power and motor 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.
Cooling clearance
•
Measure that top and bottom clearance is adequate to ensure proper air flow for cooling.
EMC considerations
•
Check for proper installation regarding electromagnetic compatibility.
Environmental consider-
ations
•
See equipment label for the maximum ambient operating temperature limits.
•
Humidity levels must be 5–95%, non-condensing.
Fusing and circuit
breakers
•
Check for proper fusing or circuit breakers.
•
Check that all fuses are inserted firmly and in operational condition and that all circuit breakers are
in the open position.
Grounding
•
The unit requires a ground wire from its chassis to the building ground.
•
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 sufficient.
Input and output power
wiring
•
Check for loose connections.
•
Check that motor and mains are in separate conduit or separated screened cables.
Panel interior
•
Inspect that the unit interior is free of debris and corrosion.
Switches
•
Ensure that all switch and disconnect settings are in the proper positions.
Vibration
•
Check that the unit is mounted solidly or that shock mounts are used, as necessary.
•
Check for an unusual amount of vibration.
Table 4.1 Start-up Checklist
Start Up and Functional Tes...
Operating Instructions
38 Danfoss A/S © Rev. 2014-07-29 All rights reserved. MG37A202
44
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