E-STOP relays, safety gate monitors Up to Category 4, EN 954-1 PNOZ X2.1 Unit features The safety function remains effecti- ve in the case of a component failu- Positive-guided relay outputs: re. 2 safety contacts (N/O), instanta- The correct opening and closing of neous the safety function relays is tested Connection options for: automatically in each on-off cycle. E-STOP pushbutton The unit has an electronic fuse. Safety gate limit switch Reset button LED indicator for: Switch status channel 1/2 Supply voltage See order reference for unit types Safety relay for monitoring E-STOP pushbuttons and safety gates. Unit description Approvals The safety relay meets the require- ments of EN 60204-1 and IEC 60204- 1 and may be used in applications with PNOZ X2.1 E-STOP pushbuttons Safety gates Safety features The relay conforms to the following safety criteria: The circuit is redundant with built-in self-monitoring. Block diagram Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Strae 2, 73760 Ostfildern, Germany NSG-D-2-341-11/04 Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh pilz.deE-STOP relays, safety gate monitors Up to Category 4, EN 954-1 PNOZ X2.1 Function description earth faults in the reset and input Manual reset: Unit is active once circuit, the input circuit is closed and then Single-channel operation: no red- short circuits in the input circuit the reset circuit is closed. undancy in the input circuit, earth and, with a monitored reset, in Increase in the number of available faults in the reset and input circuit the reset circuit too, contacts by connecting contact ex- are detected. shorts between contacts in the pander modules or external contac- Dual-channel operation with detec- input circuit. tors/relays. tion of shorts across contacts: red- Automatic start: Unit is active once undant input circuit, detects the input circuit has been closed. Timing diagram Key Power: Supply voltage c : Automatic reset t : Switch-on delay 1 Reset/start: Reset S33-S34 d : Manual reset t : Delay-on de-energisation 2 Input: Input circuits S11-S12, S21- a: Input circuit closes before reset S22 circuit Output safe: Safety contacts 13-14, b: Reset circuit closes before input 23-24 circuit Wiring Please note: Information given in the Technical details must be followed. Outputs 13-14, 23-24 are safety contacts. To prevent contact welding, a fuse should be connected before the output contacts (see technical de- tails). Calculation of the max. cable runs l in the input circuit: max R = max. overall cable resi- lmax stance (see technical details) R /km = cable resistance/km l Use copper wire that can withstand 60/75 C. Sufficient fuse protection must be provided on all output contacts with capacitive and inductive loads. Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Strae 2, 73760 Ostfildern, Germany NSG-D-2-341-11/04 Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh pilz.de -2