Safety Instructions; Applying Power - Danfoss VLT FC 102 Installation Manual

Initial Start-up
CAUTION
POTENTIAL HAZARD IN THE EVENT OF
INTERNAL FAILURE
There is a risk of personal injury when the drive modules
are not properly closed.
•
Before applying power, ensure that all safety
covers are in place and securely fastened.

6.2 Safety Instructions

See chapter 2 Safety for general safety instructions.
WARNING
6 6
HIGH VOLTAGE
The drive system contains high voltage when connected
to AC mains input power, DC supply, or load sharing.
Failure to perform installation, startup, and maintenance
by qualified personnel can result in death or serious
injury.
Before applying power:
1. Ensure that input power to the unit is OFF and
locked out. Do not rely on the drive system's
disconnect switches for input power isolation.
2. Verify that there is no voltage on mains terminals
L1 (91), L2 (92), and L3 (93), phase-to-phase, and
phase-to-ground.
3. Verify that there is no voltage on motor terminals
96 (U), 97 (V), and 98 (W), phase-to-phase, and
phase-to-ground.
4. Confirm continuity of the motor by measuring
resistance values on U–V (96–97), V–W (97–98),
and W–U (98–96).
5. Check for proper grounding of the drive system
and the motor.
6. Inspect the drive system for loose connections on
the terminals.
7. Confirm that the supply voltage matches the
voltage of the drive system and the motor.
42
®
VLT Parallel Drive Modules

6.3 Applying Power

UNINTENDED START
When the drive system is connected to AC mains, the
motor can start at any time. Unintended start during
programming, service, or repair work can result in death,
serious injury, or property damage. The motor can start
via any of the following:
•
•
•
•
•
To prevent unintended motor start:
•
•
•
Apply power to the drive system, according to the
following steps:
1.
2.
3.
4.
5.
Danfoss A/S © 08/2017 All rights reserved.
WARNING
An external switch.
A fieldbus command.
An input reference signal from the LCP.
A cleared fault condition.
Remote operation using MCT 10 Set-up
Software.
Disconnect the drive system from AC mains.
Press [Off/Reset] on the LCP, before
programming parameters.
The drive system, motor, and any driven
equipment must be fully wired and assembled
when the drive is connected to AC mains.
Confirm that the input voltage is balanced within
3%. If not, correct the input voltage imbalance
before proceeding. Repeat this procedure after
the voltage correction.
Ensure that the wiring of any optional equipment
matches the installation application.
Ensure that all operator devices are in the OFF
position.
Close all panel doors and securely fasten all
covers.
Apply power to the drive system. DO NOT start
the drive system now. For units with a disconnect
switch, turn the switch to the ON position to
apply power to the drive system.
MG37K302