Commissioning; Safety Instructions; Applying Power - Danfoss VLT Refrigeration Drive FC 103 Operating Instructions 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.
Before applying power:
1. Close cover properly.
2. Check that all cable glands are firmly tightened.
3. 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.
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. Confirm continuity of the motor by measuring
ohm values on U-V (96-97), V-W (97-98), and W-U
(98-96).
7. Check for proper grounding of the frequency
converter as well as the motor.
8. Inspect the frequency converter for loose
connections on terminals.
9. Confirm that the supply voltage matches voltage
of frequency converter and motor.
MG16E302
Operating Instructions

5.2 Applying Power

WARNING
UNINTENDED START
When the frequency converter is connected to AC mains,
the motor may start at any time, causing risk of death,
serious injury, equipment, or property damage. The
motor can start by means of an external switch, a serial
bus command, an input reference signal from the LCP, or
after a cleared fault condition.
•
•
•
Apply power to the frequency converter using the
following steps:
1.
2.
3.
4.
NOTICE
When the status line at the bottom of the LCP reads
AUTO REMOTE COASTING or Alarm 60 External Interlock
is displayed, this message indicates that the unit is ready
to operate but is missing an input signal on, for
example, terminal 27. See chapter 4.8.3 Enabling Motor
Operation (Terminal 27) for details.
Danfoss A/S © Rev. 2014-02-06 All rights reserved.
Disconnect the frequency converter from mains
whenever personal safety considerations make
it necessary to avoid unintended motor start.
Press [Off] on the LCP, before programming
parameters.
The frequency converter, motor, and any driven
equipment must be in operational readiness
when the frequency converter is connected to
AC mains.
Confirm that the input voltage is balanced within
3%. If not, correct input voltage imbalance before
proceeding. Repeat this procedure after the
voltage correction.
Ensure that optional equipment wiring, if present,
matches the installation application.
Ensure that all operator devices are in the OFF
position. Panel doors must be closed or cover
mounted.
Apply power to the unit. DO NOT start the
frequency converter now. For units with a
disconnect switch, turn to the ON position to
apply power to the frequency converter.
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