Cover sheet Safe Torque Off (STO) of an AS-idriven SINAMICS G110D with SIL 3 in compliance with IEC 62061 or PL e in compliance with ISO 13849-1 SINAMICS G110D FAQ November 2012 Service & Support Answers for industry.
This entry originates from the Siemens Industry Online Support. The conditions of use specified there apply (www.siemens.com/nutzungsbedingungen). Go to the following link to download this document. http://support.automation.siemens.com/ww/view/de/60684895 Caution The functions and solutions described in this article confine themselves predominantly to the realization of the automation task. Furthermore, please take into account that corresponding protective measures have to be taken in the context of Industrial Security when connecting your equipment to other parts of the plant, the enterprise network or the internet. Further information can be found in Entry ID:!50203404!. http://support.automation.siemens.com/ww/view/de/50203404 Question Answer How can you implement Safe Torque Off (STO) with SINAMICS G110D with SIL 3 in compliance with IEC 62061 or PL e in compliance with ISO 13849-1 by means of AS-i? Follow the instructions and notes listed in this document for a detailed answer to the above question. Contents 1 Safe Torque Off (STO) by means of AS-i... 3 2 Wiring Example... 5 3 Cable Lengths... 7 4 Consideration of the Standard... 8 5 History... 11 2
1 Safe Torque Off (STO) by means of AS-i 1 Safe Torque Off (STO) by means of AS-i With SINAMICS G110D it is ensured that the output voltage is switched off safely when there is no longer a power supply of 24V DC at the terminals X3.2 and X3.4 (black AS-i cable). If the 24V DC power supply is switched off safely at these terminals, then Safe Torque Off (STO) can be achieved. The G110D internal response time from switch-off of the 24V voltage to deletion of the pulse is under 20ms. When the 24V power supply is switched off, an error is recognized in the CU, which prevents automatic restart of the drive. This must be acknowledged before the drive can be restarted. Circuit diagram of the drive The terminals required for safe switch-off are in the marked field in the circuit diagram below. WARNING The safety function STO should be tested at the commissioning of each plant. This function test must be documented with an acceptance certificate. The safety function STO must be tested at regular intervals to discover any possible hidden errors. For this, the function must be triggered on purpose at least once a year. 3
1 Safe Torque Off (STO) by means of AS-i External safety relay You can use a fail-safe device 3TK2820 as an external safety relay. You can use this in emergency stop facilities in compliance with DIN EN ISO 13850 and in safety circuits in compliance with VDE 0113-1 or DIN EN 60204-1; for example with movable guards and safety doors. 3TK2820 Terminal assignment for 3TK2820 Operating voltage A1 L / + A2 N / - IN1 Sensor Channel 1 Sensors IN2 Sensor Channel 2 IN3 ON button / feedback loop T1 Test output 1 (for IN1) Test outputs T2 Test output 2 (for IN2) T3 Test output 3 (for IN3) 13-14 Release circuit 1 (closer, relay contact) Outputs 23-24 Release circuit 2 (closer, relay contact) 33-34 Release circuit 3 (closer, relay contact) 41-42 Alarm circuit (opener, relay contact) WARNING You must make sure that the power supply no longer provides power when the switch-off circuit of the safety relay can switch off according to data sheet specifications. Otherwise you must use contact relays that can switch off the maximum possible current. The rated operating current I e of the 3TK2820-2CB30 is 4A, for example. Circuit diagram for safe shutdown External safety relay black AS-i cable yellow ASi cable SINAMICS G110D (AS-i bus connection) 24V DC 13 23 14 24 4
2 Wiring Example 2 Wiring Example Wiring example with emergency stop command device without contact relay The figure below shows the connection of an emergency stop command device to the external safety relay (3TK2820) and the connection to the SINAMICS G110D. 5
2 Wiring Example Wiring example with emergency stop command device with contact relay The figure below shows the connection of an emergency stop command device to the external safety relay (3TK2820) and the connection to the SINAMICS G110D if you use a contact relay (Q1, Q2). 6
3 Cable Lengths 3 Cable Lengths The maximum cable lengths for all frequency converters are given in the table below. Cable Shielding Maximum length Motor* shielded 15 m (49 ft) unshielded 30 m (98 ft) Temperature sensor* shielded 15 m (49 ft) unshielded 30 m (98 ft) Brake* shielded 15 m (49 ft) unshielded 30 m (98 ft) Digital inputs unshielded 30 m (98 ft) *The motor, temperature sensor and brake connections are all separate cables connected to the power module with Harting connectors. 7
4 Consideration of the Standard 4 Consideration of the Standard Aim In the above we showed an interconnection for implementing a safety function that achieves SIL 3 in compliance with IEC 62061 or PL e in compliance with ISO 13849-1. The aim of this chapter is to prove that the safety classes (SIL and PL) are achieved. The Safety Evaluation Tool (SET) is used as proof. Safety Evaluation Tool (SET) The Safety Evaluation Tool (SET) is available free of charge at the following link: https://eb.automation.siemens.com/spice/sid/index.html Standard used You can use the SET to consider the standards below. IEC 62061 ISO 13849-1 The project file "SET_G110D.set" described in this chapter was created on the basis of ISO 13849-1. Notes on SRP/CS In order to achieved the required PL e in compliance with ISO 13849-1 for the safety function, the selection of products for the separate SRP/CSs is of importance. By way of example, we have chosen the following: SRP/CS DETERMINATION: Emergency Stop (turn-to-reset) SRP/CS EVALUATION: 3TK2820 SRP/CS RESPONSE: SINAMICS G110D Below we use products as examples for the separate SRP/CSs which meet this requirement and interactively produce a safety function that achieves PL e in compliance with ISO 13849-1. 8
4 Consideration of the Standard SRP/CS DETERMINATION SRP/CS EVALUATION 9
4 Consideration of the Standard SRP/CS RESPONSE Note The safety-relevant values of the SINAMICS G110D are currently not available in the SET. For the time being, therefore, you should set the PFH D value manually ("Manufacturer > Direct Input"). Integration of the safety-relevant values (see below) of the SINAMICS G110D is in preparation. SFF = 60% PFH D = 1.8 E-08 MTTF D = 100a SIL 3 in compliance with IEC 62061 PL e in compliance with ISO 13849-1 Result The sum of the PFH D values of the individual SRP/CS lies below 1.0 E-07. This means the safety function achieves PL e in accordance with ISO 13849-1. Reached PL: PL e Reached PFH D : 4.36 E-08 10
5 History 5 History Date Version Change 05/2012 V 1.0 Creation 11/2012 V 1.1 Additional Information 11