Commissioning; Safety Instructions - Danfoss FC 301 Operating Manual

Commissioning

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 qualified
personnel could result in death or serious injury.
•
Installation, start-up, and maintenance must be
performed by qualified 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.
MG33AT02
Operating Guide
Before applying power:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Danfoss A/S © 05/2018 All rights reserved.
Close the safety cover properly.
Check that all cable glands are firmly tightened.
Ensure that input power to the unit is off and
locked out. Do not rely on the frequency
converter disconnect switches for input power
isolation.
Verify that there is no voltage on input terminals
L1 (91), L2 (92), and L3 (93), phase-to-phase, and
phase-to-ground.
Verify that there is no voltage on output
terminals 96 (U), 97 (V), and 98 (W), phase-to-
phase, and phase-to-ground.
Confirm continuity of the motor by measuring Ω
values on U–V (96–97), V–W (97–98), and W–U
(98–96).
Check for proper grounding of the frequency
converter and the motor.
Inspect the frequency converter for loose
connections on the terminals.
Confirm that the supply voltage matches the
voltage of the frequency converter and the
motor.
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