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Bsp. -Nr. 3.3 Safe standstill for interlocked protective doors, Emergency Stop, implemented with safety combinations and standard PLC P24 M e g n ä g s u A e l a t i g i D e g n ä g n i E e l a t i g i D DO1 DO2 DO3 DO4 Standard -SPS DI1 DI2 DI3 DI4 DI5 DI6 DI7 DI8 Ein -S4 Aus -S2 P24 -Y1 -S6 "Safe Standstill" with SINAMICS for interlocked protective door, standard PLC and protective safety combination, stop Category 1, Category 3 acc. to EN 954-1 Function description A structure in compliance with EN 954-1 control Category 3 and EN1037 can be implemented using two SIGUARD safety combinations for Emergency Stop and protective doors and a standard PLC. The drive is shut down (stopped) with stop function Category 1 according to EN 60204-1. ■ The integrated safety function "safe standstill" corresponds to Category 3 according to EN 954-1 and SIL 2 according to IEC 61508. A non-safety checkback signal "Safe Standstill active" is sufficient. ■ <strong>Safety</strong> combinations for Emergency Stop and protective door monitoring correspond to Category 4 (instantaneous enable circuit) or Category 3 (delayed enable circuit). ■ Circuits for Emergency Stop and protective door monitoring are monitored through 2 channels in a cross-circuit proof fashion. 434 Functional Example No. MC-FE-I-003-V12-EN -A1 Ein -S1 auf zu -A2 Not-Halt -S3 A1 Y10 Y11 Y12 Y21 Y22 13 23 31 47 57 3TK2827 Y33 Y34 PE A2 -S4 -S5 A1 Y10 Y11 Y12 Y21 Y22 13 23 31 47 57 3TK2828 Y33 Y34 PE A2 14 24 32 48 58 14 24 32 48 58 Hauptschalter -Q1 X122 1 DI0: AUS1 2 DI1: AUS3 3 DI2: SH CU 7 DO8: n=0 8 DO9: SH aktiv U1 V1 W1 SH EP EP 24+ M U2 V2 W2 ■ Switches S4, S5 and S6 are positively opening position switches corresponding to EN 1088. ■ When implementing as higher-level circuit using contacts, the "safe standstill" function is guaranteed even when the PLC develops a fault or fails. ■ The communication via digital in- and outputs between drive and PLC can be displaced with a non-safe standard communication (e.g. PROFIBUS). ■ The Emergency Stop function doesn't mandatory require an isolation from the line supply. When carrying-out work on the motor or the frequency converter, the equipment must always be isolated from the line supply with a (lockable) main switch. Netz Line Module Control Unit Motor Module M 3
Behavior at Emergency Stop Emergency Stop is initiated using button S3 ("Emergency Stop"). It is initiated that the drive is shut down according to stop Category 1 in compliance with EN 60204-1: ■ A 0 signal is entered, via the enable contact of safety combination A1, at contact X122.2 (DI 1: OFF3) of the drive. The drive is immediately braked down to 0 speed and the pulses are cancelled. ■ The safely delayed enable contacts of safety combination A1 open after the selected delay time has expired. This means that the function "safe standstill" of the drive is twochannel activated and given feedback via terminal S122.8 (DO 9: SH active). ■ The checkback signals of the safety combination and the drives were monitored and evaluated by the PLC. Behavior when the protective doors are opened Button S2 ("Off") requests that the protective doors are opened. This initiates that the drive is shut down according to stop Category 1 in compliance with EN 60204-1: ■ A 0 signal is entered at contact X122.2 (DI 1:OFF3) of the drive by resetting the PLC output DO3. The drive is immediately braked down to 0 speed and the pulses are cancelled. ■ If the drive is stationary (DO 8: speed = 0), then PLC output DO2 to the drive is reset. This means that the EP-terminal of the line modul and the digital input (DI 2: SH) of the control unit are no longer energized. The safety function "Safe standstill" is activated. ■ Detecting that the function "safe standstill" is active (PLC DI 7: SH active), the protective door interlocking is opened by setting PLC output DO4 to energize coil Y1. ■ When the protective door is opened the safety monitoring A2 of the safety circuit is interrupted Note If the protective door interlocking opens before the drive has braked down to 0 speed as a result of an erroneous PLC function, then a 0 signal is entered at contact X122.2 (DI 1: OFF3) of the drive via the switch S6. The drive is immediately braked down to speed = 0 and the pulses cancelled. Opening of the protective doors initiates the function "safe standstill". It must be ensured that potentially hazardous motion has come to a standstill before a person can reach the potentially hazardous area! Powering-up the drive The drive can be started when the protective doors are closed and Emergency Stop button S3 is released. ■ When pressing button S1 ("On"), safety combination A1 is brought into the operational state. The coil of latch (tumbler) Y1 is no longer energized by resetting PLC output DO4 - the protective doors are interlocked. <strong>Safety</strong> combination A2 is again in an operational state. ■ A 1 signal is entered both at the PLC outputs DO2 and DO3, the functions "safe standstill" and quick stop at terminal X122.2 (DI 1: Out 3) are deactivated ■ Entering a rising edge at the PLC Output DO1 to the terminal X122.1 (DI 0: Out 1), the drive is set again in an operational state. Functional Example No. MC-FE-I-003-V12-EN 435 Bsp.- Nr. 3.3
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