Festo CMMP-AS M0 Series, Руководство пользователя

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Festo — CMMP-AS-...-M0 — 2022-07c
Description of the safety function STO
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3.2.1 Description of the STO safety function
Use the “Safe Torque Off” function (STO) whenever you need to disconnect the energy supply to the
motor reliably in your application.
The “Safe Torque Off” function switches off the driver power supply for the power semiconductor, thus
preventing the power output stage from supplying the power required by the motor; see the diagram
below.
1
2 3
4
4 5
6
Fig. 2: “Safe torque off” - functional principle for the CMMP-AS-…-M0
1 Safety command device (e.g. switch, relay,
safety relay unit)
2
STO integrated safety function
3
Power output stage in the CMMP-AS-…-M0
(only one phase shown)
4 Driver power supply
5 Motor connection
6 Feedback contact
The power supply to the drive is safely disconnected when the STO “Safe Torque Off” safety function
is active. The drive cannot generate torque or force and so cannot perform any dangerous movements.
With suspended loads or other external forces, additional measures must be taken to ensure that the
load does not drop (e.g. mechanical holding brakes). The standstill position is not monitored in the
STO “Safe Torque Off” state.
The machine must be brought to a standstill in a safe manner and secured, e.g. with a safety relay
unit.