Danfoss VLT HVAC Operating Instructions Manual page 28

Start Up and Functional Tes...
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
Auxiliary equipment
Cable routing
Control wiring
Cooling clearance
EMC considerations
Environmental considerations
Fusing and circuit breakers
(grounding)
Input and output power wiring
Panel interior
Switches
Vibration
Table 3.1 Start Up Check List
®
VLT HVAC Drive Operating Instructions
Description
•
Look for auxiliary equipment, switches, disconnects, or input fuses/circuit
breakers that may reside 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 motor(s), if present.
•
Ensure that input power, motor wiring , and control wiring are separated or in
three separate metallic conduits for high frequency noise isolation.
•
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.
•
Measure that top and bottom clearance is adequate to ensure proper air flow
for cooling.
•
Check for proper installation regarding electromagnetic compatibility.
•
See equipment label for the maximum ambient operating temperature limits.
•
Humidity levels must be 5-95% non-condensing.
•
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.
•
The unit requires an earth wire(ground wire) from its chassis to the building
earth (ground).
•
Check for good earth connections(ground connections) that are tight and free
of oxidation.
•
Earthing (Grounding) to conduit or mounting the back panel to a metal surface
is not a suitable earth (ground).
•
Check for loose connections.
•
Check that motor and mains are in separate conduit or separated screened
cables.
•
Inspect that the unit interior is free of dirt, metal chips, moisture, and
corrosion.
•
Ensure that all switch and disconnect settings are in the proper positions.
•
Check that the unit is mounted solidly or that shock mounts are used, as
necessary.
•
Check for an unusual amount of vibration.
®
MG11AH02 - VLT is a registered Danfoss trademark
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