5 Commissioning
5.1 Safety Instructions
See chapter 2 Safety for general safety instructions.
WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input power. Failure to perform
installation, start-up, and maintenance by qualied
personnel could result in death or serious injury.
•
Installation, start-up, and maintenance must be
performed by qualied personnel only.
NOTICE
The front covers with warning signs are an integrated
part of the frequency converter and considered safety
covers. The covers must be in place before applying
power and at all times.
Before applying power:
1. Close the safety cover properly.
2. Check that all cable glands are rmly tightened.
3. Ensure that input power to the unit is o and
locked out. Do not rely on the frequency
converter disconnect switches for input power
isolation.
4. Verify that there is no voltage on input terminals
L1 (91), L2 (92), and L3 (93), phase-to-phase, and
phase-to-ground.
5. Verify that there is no voltage on output
terminals 96 (U), 97 (V), and 98 (W), phase-to-
phase, and phase-to-ground.
6.
Conrm continuity of the motor by measuring Ω
values on U–V (96–97), V–W (97–98), and W–U
(98–96).
7. Check for proper grounding of the frequency
converter and the motor.
8. Inspect the frequency converter for loose
connections on the terminals.
9. Conrm that the supply voltage matches the
voltage of the frequency converter and the
motor.
Commissioning Operating Guide
MG33AT02 Danfoss A/S © 05/2018 All rights reserved. 17
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