4.1.6
Error exclusion
Plan suitable action to prevent wiring errors:
–
Error exclusion in wiring according to EN 61800-5-2.
–
Monitoring of the outputs and wiring up to the servo drive by the switching equipment.
4.1.7
Safety relay unit
Use suitable safety relay units with the following characteristics:
–
2-channel outputs with
–
cross-circuit detection
–
required output current (also for STO)
–
low test impulses up to a maximum length of 1 ms
–
Evaluation of the diagnostic outputs of the servo drive
Safety relay units with high test impulses can be used with the following restrictions:
–
Test impulses up to 1 ms in length
–
Test impulses are not simultaneous/overlapping on #STO-A/B and #SBC-A/B
–
The resulting safety-related classification depends on the evaluation of diagnostic feedbacks STA,
SBA
è
9.1 Technical data, safety equipment, safety data STO and SBC.
Suitable would be, for example, the safety relaysPilz PNOZmulti, Pilz PNOZmulti Mini or SIEMENS ET
200SP with PP-switching output modules.
4.1.8
Interfaces of the PDS
The interfaces of the PDS(SR) (Power Drive System, safety related) to the outside world are:
–
Power supply
–
Inputs and diagnostic check-back signals
–
Movement of the shaft
–
Output for controlling a second brake
Interfaces of the PDS
Product overview
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Festo — CMMT-AS-...-S1 — 2018-02