Group Stop, Ss 1 - BONFIGLIOLI Agile Applications Manual

10.3 Group Stop, SS 1

The application circuit shows a drive control system with PLC and safety module according to EN ISO
13849-1 PL d and Category 3 or IEC 61508 SIL 2. A PLC performs the process control of the frequency
inverter and can start the drive profiles via commands which are communicated through the field bus.
If the protective device is actuated, e.g. emergency stop switch, the enable paths of the safety module
are interrupted. At first, the travel signal "Clockwise" is reset. Then, the motors are decelerated in a
controlled way. After a delay t , the controller enable signal of the frequency inverters is interrupted via
v
the disconnection of the control voltages from STOA and STOB and the integrated safe pulse block is
activated.
Via the field bus, the (non-safe) feedback is transmitted to the PLC indicating that the drives have
stopped. Except for the terminals shown in the diagram, no further terminals are required for connec-
tion.
Note, that with high current demand a fuse leading to the safety contacts might be necessary according
to the instructions of the safety device manufacturers.
The external DC 24 V supply must be dimensioned accordingly, see chapter 7.3.1.
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