Inspection Before Start Up - Danfoss VLT FC Series Operating Instructions Manual

Start Up

4.1.1 Inspection Before Start Up

Before applying power to the unit, inspect the entire installation as detailed in Table 4.1.
Inspect for
Auxiliary equipment
4 4
Cable routing
Control wiring
EMC considerations
Environmental conditions
Fan clearance
Fusing and circuit breakers Check that all fuses are inserted firmly and in operational condition and that all circuit breakers are in the
Grounding
Input and output power
wiring
Panel interior
Proper clearance
Switches
Vibration
Table 4.1 Inspection Before Start Up
30
Option Panel Operating Instructions
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.
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.
®
MG14I102 - VLT
Description
is a registered Danfoss trademark