Operating Instructions
Table Of Contents
- Table of contents
- 1 For your safety
- 2 Product description and method of operation
- 3 Mounting
- 4 Electrical connection
- 5 Startup
- 6 Function test
- 7 Service and maintenance
- 8 LED status indicators and switching states
- 9 Application examples
- 10 Technical data and ordering data
- A Technical appendix
- B Revision history
- Please observe the following notes
- How to contact us
Application examples
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9.2 PSR-CT safety switches with safety relay
9.2.1 Series connection with central reset on the switching
device
Application description
Switch chain The application example shows three PSR-CT safety switches connected in series for mon-
itoring safety equipment. The switch chain is connected to a safety relay. The safety relay
evaluates the signals of the switch chain and switches connected actuators.
Central manual, monitored
start
The safety relay is equipped with a reset button for manual, monitored start.
The safety switches are wired for operation with autostart.
If at least one safety equipment item is opened and closed again, the safety function is reset
centrally via the reset button on the switching device.
Notes
Phoenix Contact components used
– 3 x PSR-CT safety switch
– Safety relay: PSR-MC40-3NO-1DO-24DC-..
WARNING: Loss of functional safety
Make sure that all safety switches and the safety relay have the same ground potential.
WARNING: Risk due to unexpected machine startup
Cross-circuit between A2 (0 V) and the cable of the reset button for connecting S34 of the
safety relay can result in automatic machine startup.
• Avoid cross-circuit between A2 (0 V) and the cable from the reset button to S34 by
means of design measures, e.g., protected cable installation.
• See fault exclusion according to EN ISO 13849-2.
Also observe the documentation for all other devices used together with the safety switch.