Safe torque off function 241
WARNING! With permanent magnet motors 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 degrees (with permanent magnet motors)
or 180/2p degrees (with synchronous reluctance [SynRM] motors) 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.
• Diagnostics of the Safe torque off function during a power outage are not
available. Using the +24 V keep-alive option module CMOD-02 option with the
drive does not power on the STO diagnostics.
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