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 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
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 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
Earthing (Grounding)
•
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)
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 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 3.1 Start Up Check List
Start Up and Functional Tes...
VLT
®
HVAC Drive Operating Instructions
26 MG11AI02 - VLT
®
is a registered Danfoss trademark
33
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