Danfoss VLT FCD 302 Operating Manual page 40

Operating Guide | VLT® Decentral Drive FCD 302
6 Operating the Drive
6.1 Pre-start Checklist
Refer to 1.8 General Safety Precautions
Before completing installation of the unit, inspect the entire installation as detailed in
completed.
Table 14: Pre-start Checklist
Inspect
Isolate the energy sources
Input and output power
wiring
Cable routing
Control wiring
Auxiliary equipment
EMC considerations
Environmental considera-
tions
Cooling clearance
Fusing and circuit breakers
Switches
Grounding
Installation box and elec-
tronics part
Cable glands and blind
plugs
40 | Danfoss A/S © 2025.04
before operating the drive.
Description
Verify that the input power to the unit is switched off and locked out. Do not rely on the drive
l
disconnect switches for input power isolation.
Verify that there is no voltage on mains terminals L1 (91), L2 (92), and L3 (93), phase-to-
l
phase, and phase-to-ground.
Verify that there is no voltage on output terminals 96 (U), 97 (V), and 98 (W), phase-to-phase,
l
and phase-to-ground.
Confirm continuity of the motor by measuring Ω values on U–V (96–97), V–W (97–98), and
l
W–U (98–96).
Check for loose connections.
l
Check for proper fusing or circuit breakers.
l
Ensure that input power, motor wiring, and control wiring are separated or in 3 separate metallic
conduits for high frequency noise isolation.
Check for broken or damaged wires and connections.
l
Check the voltage source of the signals, if necessary.
l
The use of shielded cable or twisted pair is recommended. Ensure that the shield is
l
terminated correctly at both ends.
Look for auxiliary equipment, switches, disconnects, or input fuses/circuit breakers on the
l
input power side of the drive, or the output side to the motor. Examine their operational
readiness and ensure that they are ready in all respects for operation at full speed.
Check the function and installation of any sensors used for feedback to the drive.
l
Remove power factor correction caps on motor/motors, if present.
l
Check for proper installation regarding electromagnetic compatibility.
See the equipment label for the maximum ambient operating temperature limits. Temperature is
not to exceed 40 °C (104 °F). Humidity levels must be 5–95% non-condensing.
Units require top and bottom clearance adequate to ensure proper airflow for cooling.
Check that all fuses are inserted firmly and in operational condition and that all circuit breakers
are in the open position. Check for proper fusing or circuit breakers.
Ensure that all switch and disconnect settings are in the proper position.
The equipment requires a dedicated ground wire from its chassis to the plant ground. Check for
good ground connections that are tight and free of oxidation.
Ensure the installation box and the electronics part is properly closed. Check that all 4 fastening
screws are tightened with the right torque.
Ensure that the cable glands and blind plugs are properly tightened to guarantee that the right
enclosure protection degree is achieved. Liquids and/or excessive dust ingress in the drive can
cause suboptimal performance or damage.
Table 14. Check and mark the items when
AQ267036816112en-000301 / 130R0208
Operating the Drive
☑