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VLT® Compressor Drives
Installation Guide
HAZARDOUS VOLTAGE
AC drives contain hazardous voltage when connected to the AC mains or connected on the DC terminals. Failure to perform
installation, start-up, and maintenance by skilled personnel can result in death or serious injury.
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Only skilled personnel must perform installation, start-up, and maintenance.
DISCHARGE TIME
The drive contains DC-link capacitors, which can remain charged even when the drive is not powered. High voltage can be
present even when the warning indicator lights are off. Failure to wait the specified time after power has been removed before
performing service or repair work can result in death or serious injury.
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Stop the motor.
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Disconnect all power sources, including permanent magnet type motors.
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Wait for capacitors to discharge fully. The discharge time is shown on the exterior of the drive.
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Measure the voltage level to verify full discharge.
UNINTENDED START
When the drive is connected to the AC mains or connected on the DC terminals, the motor may start at any time, causing risk of
death, serious injury, and equipment or property damage.
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Stop the drive and motor before configuring parameters.
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Make sure that the drive cannnot be started by external switch, a fieldbus command, an input reference signal from the con-
trol panel, or after a cleared fault condition.
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Disconnect the drive from the mains whenever safety considerations make it necessary to avoid unintended motor start.
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Check that the drive, motor, and any driven equipment are in operational readiness.
INTERNAL FAILURE HAZARD
An internal failure in the drive can result in serious injury when the drive is not properly closed.
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Ensure that all safety covers are in place and securely fastened before applying power.
1.5 Electrical Installation Precautions
Before starting electrical work on the drive, lock out and tag out all power sources to the drive.
ELECTRICAL SHOCK AND FIRE HAZARD – RCD COMPLIANCE
The drive can cause a DC fault current in the PE conductor. Failure to use a Type B residual current-operated protective device
(RCD) can lead to the RCD not providing the intended protection and therefore can result in death, fire, or other serious hazard.
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When an RCD is used for protection against electrical shock or against fire, only a Type B device is allowed on the supply side.
6 | Danfoss A/S © 2022.09
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Instructions
AN39643481725001-000101 / 130R1233
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