Inspection Prior To Start Up - Danfoss VLT Option Panel Instruction Manual

Inspection Prior to Start Up

Before applying power to the unit, inspect the entire
installation as detailed in Table 4-1.
Inspect For
Auxiliary
equipment
Cable routing
Control wiring
EMC
considerations
Environmental
conditions
Fan clearance
Fusing and
circuit breakers
Grounding
Input and output
power wiring
Panel interior
Proper
clearance
Switches
Vibration
Table 4-1. Inspection Prior to Start Up
Look for auxiliary equipment, switches, disconnects, or input fuses/circuit
breakers that may reside on input power side of drive or output side to motor.
Examine their operational readiness and ensure they are ready in all respects
for operation at full speed. Check function and installation of pressure sensors
or encoders (etc.) used for feedback to drive. Remove power factor correction
caps on motor(s), if present.
Ensure that input power, motor wiring and control wiring are in three separate
metallic conduits for high frequency noise isolation. Failure to isolate power,
motor and control wiring could result in less than optimum drive and associated
equipment performance.
Check for broken or damaged wires and connections. Check the voltage
source of the signals, if necessary. The use of shielded cable or twisted pair is
recommended. Ensure the shield is terminated correctly.
Check for proper installation with regard to electromagnetic capability.
See option panel label for the maximum ambient operating temperature.
Humidity levels must be less than 95% non-condensing.
Some units have a cooling fan located below the drive and require sufficient
clearance for fan removal. See the installation drawing supplied with the unit
for clearance requirements.
Check that all fuses are inserted firmly and in operational condition and that all
circuit breakers are in the open position.
The option panel requires a dedicated ground wire from its chassis to the
building ground. It is highly recommended that the motor be grounded to the
panel chassis. The use of conduit or mounting of the panel to a metal surface
is not considered a suitable ground. Check for good ground connections that
are tight and free of oxidation.
Check for loose connections. Check for proper fusing or circuit breakers.
Option panel interior must be free of dirt, metal chips, moisture, and corrosion.
Check for harmful airborne contaminates such as sulfur based compounds.
Option panels require top and bottom clearance adequate to ensure proper air
flow for cooling in accordance with the unit size.
Ensure that all switch and disconnect settings are in the proper position.
Look for any unusual amount of vibration the equipment may be subjected to.
The panel should be mounted solidly or the use of shock mounts employed.
Description
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