ElmoMC SimplIQ Digital Servo Drives-Bell Command Reference - Manual (Page 236)

If the error counter reaches the threshold of PN[1], The motor is shut down (MO=0) and
MF is set to 0x4.
After detection of a commutation fault, the motor must be shut down and a proper MF
code set to be active. The motor cannot be stopped under control, because the correlation
between the motor currents and the resulting torque is not known. At the next motor
startup attempt, the motor will again seek commutation.
SimplIQ for Steppers Application Note Commutation and Pole Identification
MAN-STECR (Ver. 1.1)
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