Instructions For Functional Safety Circuits - ABB Q957 User Manual

8 Safety instructions

Instructions for functional safety circuits

This manual does not contain the complete safety instructions of the drive. It only includes
the instructions related to the scope of this manual.
Only a qualified electrical professional who has sufficient knowledge about functional,
machine, and process safety is permitted to install, start up and maintain the safety circuit.
All user-made changes are on the user's responsibility.
WARNING!
The safety function described in this manual does not isolate the main circuit or
auxiliary circuit from the power supply. Do not do work on the drive, motor cable
or motor before you have isolated the drive system from all power supplies and
measured that there are no dangerous voltages. Before you start the work, do the
steps in section
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!
Do the validation test of the safety function at the start-up and also after you make
changes to the safety circuit.
WARNING!
Make sure that the functional safety of the machine is maintained in situations
where the safety option does not provide protection, for example, during
commissioning, system maintenance, fault tracing, or decommissioning.
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 (page 9).