Electrical Safety Precautions - ABB ACS880 User Manual

8 Safety instructions
Only a qualified electrician who has appropriate knowledge on functional, machine, and
process safety is allowed to install, start up and maintain the safety circuit. All user-made
changes are on the user's responsibility.
WARNING! This safety function does not disconnect the voltage of the main and
auxiliary circuits from the drive. Do not work on the electrical parts of the drive or
the motor before you have isolated the drive system from all power supplies and
made sure by measuring that there is no dangerous voltage present.
WARNING!
(With permanent magnet or synchronous reluctance [SynRM] motors only)
In case of a multiple IGBT power semiconductor failure, the drive system can
produce an alignment torque which maximally rotates the motor shaft by 180/p
(with permanent magnet motors) or 180/2p (with synchronous reluctance [SynRM]
motors) degrees regardless of the activation of the Safe torque off function. p
denotes the number of pole pairs.
WARNING! Always test the operation of the safety circuit according to its
acceptance test procedure at the start-up and after any changes to the safety
circuit.
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or death, or
damage to the equipment can occur.
If you are not a qualified electrical professional, do not do installation or
maintenance work.

Electrical safety precautions

These electrical safety precautions are for all personnel who do work on the drive, motor
cable or motor.
WARNING!
Obey these instructions. If you ignore them, injury or death, or damage to the
equipment can occur.
If you are not a qualified electrician, do not do installation or maintenance work.
Go through these steps before you begin any installation or maintenance work.
1. Clearly identify the work location and equipment.
2. Disconnect all possible voltage sources. Make sure that re-connection is not possible.
Lock out and tag out.
• Open the main disconnecting device of the drive.
• If the drive is equipped with a DC/DC converter unit (optional): Open the DC
switch/disconnector ([Q11], option +F286) of the DC/DC converter. Open the
disconnecting device of the energy storage connected to the DC/DC converter unit
(outside the drive cabinet).
• If you have a permanent magnet motor connected to the drive, disconnect the motor
from the drive with a safety switch or by other means.