ABB ACS380 Series, Руководство по оборудованию, Страница: 147 / 186

Safe torque off function 147
WARNING! (With permanent magnet motors or synchronous reluctance
motors [SynRM] 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 degrees regardless of the activation of the
Safe torque off function. p denotes the number of pole pairs.
Notes :
• If a running drive is stopped by using the Safe torque off function, the drive will cut
off the motor supply voltage and the motor will coast to a stop. If this causes
danger or is not otherwise acceptable, stop the drive and machinery using the
appropriate stop mode before activating the Safe torque off function.
• The Safe torque off function overrides all other functions of the drive unit.
• The Safe torque off function is ineffective against deliberate sabotage or misuse.
• The Safe torque off function has been designed to reduce the recognized
hazardous conditions. In spite of this, it is not always possible to eliminate all
potential hazards. The assembler of the machine must inform the final user about
the residual risks.
• The Safe torque off diagnostics are not available during power outages, or when
the drive is only powered by the +24 V power extension module BAPO-01.