10.5 Safe Torque Off Circuit
The Safe Torque Off function is designed with redundant blocking devices, which act independently on
the power modules. This is advantageous because it does not disable the power supply of the drive
and avoids the normal restart process.
WARNING:Personal injury and property damage risk.
The restart of the STO function is automatic when the safety inputs are active,
which may cause death or serious injury to personnel or damage to equipment.
Ø It is the responsibility of the machine manufacturer to check and install, if
necessary, a manual reset function to prevent the automatic restart of the
motor.
The DM2020 system controls the movements of a three-phase AC motor through the generation of a
rotating magnetic field. To this end, the microprocessor generates a complex pattern of pulses (PWM),
which are amplified and used to pilot the power semiconductors. The Safe Torque Off function of the
DSM020 system operates through hardware with two channels that interrupt the direct impulses to
IGBT.
Two modes of monitoring are provided for detecting dangerous faults: the monitoring system
"Hardware Feedback" indicates the status of the circuit; the same information is available through the
"Software Feedback" a system consisting of a binary digital signal defined by the IEC 61800-7-201,
402 CIA Object 60FD, (digital inputs) bit 3.
PN: L-MAM2-E-201
Moog Casella DM2020 Installation and Startup Guide
10.5 Safe Torque Off Circuit
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