3.1.2 Start Up Check List
CAUTION
Before applying power to the unit, inspect the entire installation as detailed in Table 3.1. Check mark those items when
completed.
Inspect for Description
☑
Auxiliary equipment
•
Look for auxiliary equipment, switches, disconnects, or input fuses/circuit breakers
that may reside on input power side of frequency converter or output side to
motor. Examine their operational readiness and ensure that they are ready in all
respects for operation at full speed.
•
Check function and installation of any sensors used for feedback to frequency
converter
•
Remove power factor correction caps on motor(s), if present
Cable routing
•
Ensure that input power, motor wiring, and control wiring are separated or in
three separate metallic conduits for high frequency noise isolation
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
•
The use of shielded cable or twisted pair is recommended. 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 considerations
•
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 a
suitable ground
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 dirt, metal chips, moisture, and corrosion
Switches
•
Ensure that all switch and disconnect settings are in the proper position
Vibration
•
Check that the unit is mounted solidly or that shock mounts are used, as
necessary
•
Look for any unusual amount of vibration the unit may be subjected to
Table 3.1 Start Up Check List
Start Up and Functional Tes...
VLT
®
AutomationDrive Operating
Instructions
22 MG.33.AJ.02 - VLT
®
is a registered Danfoss trademark
3
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