5 Commissioning
5.1 Safety Instructions
See 2 Safety for general safety instructions.
WARNING
HIGH VOLTAGE!
Adjustable frequency drives contain high voltage when
connected to AC line power. Installation, start-up, and
maintenance must be performed by qualified personnel
only. Failure to perform installation, start-up, and
maintenance by qualified personnel could result in death
or serious injury.
Before applying power:
1. Close cover properly.
2. Check that all cable connectors are firmly tightened.
3. Ensure that input power to the unit is OFF and
locked out. Do not rely on the adjustable frequency
drive 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 adjustable
frequency drive as well as the motor.
8. Inspect the adjustable frequency drive for loose
connections on terminals.
9. Confirm that the supply voltage matches voltage of
adjustable frequency drive and motor.
5.2
Applying Power
WARNING
UNINTENDED START!
When the adjustable frequency drive is connected to AC
line power, the motor may start at any time. The
adjustable frequency drive, motor, and any driven
equipment must be in operational readiness. Failure to be
in operational readiness when the adjustable frequency
drive is connected to AC line power could result in death,
serious injury, equipment, or property damage.
1. Confirm that the input voltage is balanced within
3%. If not, correct input voltage imbalance before
proceeding. Repeat this procedure after the voltage
correction.
2. Ensure that optional equipment wiring (if present)
matches the installation application.
3. Ensure that all operator devices are in the OFF
position. Panel doors must be closed or cover
mounted.
4. Apply power to the unit. DO NOT start the
adjustable frequency drive at this time. For units
with a disconnect switch, turn to the ON position to
apply power to the adjustable frequency drive.
NOTICE!
If the status line at the bottom of the LCP reads AUTO
REMOTE COASTING or Alarm 60 External Interlock is
displayed, this indicates that the unit is ready to operate
but is missing an input signal on terminal 27. See
4.8.3 Enabling Motor Operation (Terminal 27) for details.
Commissioning
VLT
®
HVAC Drive Instruction Manual
24 MG11AJ22 - Rev. 2013-09-13
55
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