QSHT 5700 Inverter Safe Torque-off Function
Hardwired Safe Torque-off
270 MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
A simultaneous fault in two of the power switching devices in the QSHT 5700 inverter can
result in a large but stationary stator current. This current will result in a force versus position
characteristic that is a repeating cyclic (generally sinusoidal) pattern. This pattern has both
stable and unstable equilibrium points, and the motor will seek the nearest stable point.
Because the pattern is roughly sinusoidal, the nearest stable point can be up to 180 electrical
degrees away from any given arbitrary initial position, which corresponds to a distance of
60 mm.
ATTENTION: Once there is a GuardStopInputFault, recovery
occurs once the STO inputs for both axes (regardless of
which one has faulted) are switched OFF simultaneously for
at least one second. After 1 sec, if no abnormal condition is
present then the inverter can be returned to normal operation
and the fault is reset.
ATTENTION: Linear permanent magnet motors can, in the
event of two simultaneous faults of the IGBT circuit, result
in a movement of up to 180 electrical degrees, which corre-
sponds to a distance of 60 mm for QSHT 5700 motors.
ATTENTION: If any of the STO inputs de-energize, the
Block n Inverter Faults GuardStopRequestStatus bit in the
MMI_path_qs_ht_faults_status tag is set to 1.
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