3 Startup and Commissioning
3.1 Pre-start
CAUTION
Before applying power to the unit, inspect the entire
installation as detailed in
. 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 adjustable frequency 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 adjustable frequency drive
•
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
•
Make sure that the top and bottom clearance is adequate to ensure proper airflow 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 a suitable ground
Input and output power
wiring
•
Check for loose connections.
•
Check that motor and line power are in separate conduit or separated shielded cables.
Panel interior
•
Make sure 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 Startup Check List
Startup and Commissioning
VLT
®
HVAC Drive D-Frame
Instruction Manual
MG16D222 - VLT
®
is a registered Danfoss trademark
3-1
3
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