Hardware manual - MACCON GmbH

Kollmorgen 06/2012 Technical description6.9 Safety function STOA frequently required application task is the safe torque off and the protection of personnelagainst unintentioned restarting of drives. The S700 servo amplifier offers, even in thebasic version, a two channel STO function (Safe Torque Off). The function blocks the triggerpulses of the power transistors (pulse inhibitor).Advantages of the safety function STO:— the DC bus link remains charged up, since the mains supply line remains active— only low voltages are switched, so there is no contact wear— very little wiring is required— single or dual channel control possible— SIL2 or SIL3 solutions possibleThe STO safety function corresponds to stop category 0 (uncontrolled stopping) acc. toEN 60204-1. The safety function STO can be operated from external safety switch gears(relays), from a safe external control (semiconductor output or driven contact) or from thebuilt-in safety card S1 or S2 (see p. 150).The STO safety concept is certified by the TÜV. The safety circuit concept for realizingthe safety function "Safe Torque Off" in the servo amplifiers S700 is suited for SIL CL3according to IEC 62061 and PLe according to ISO 13849-1.SIL2 / PLd solutions can be implemented with single-channel or dual-channelcontrol with simple safety switching devices.A SIL3 / PLe solution requires a safety control that periodically tests the safeswitching of the pulse inhibitor by analyzing the feedback signal.6.9.1 Safety characteristic dataThe subsystems (servo amplifiers) are totally described for safety technics with thecharacteristic data SIL CL, PFH D and T M .Device Operation mode EN 13849-1 EN 62061 PFH D [1/h] T M [Year]STO STO single channel PLd, Cat 3 SIL CL2 7.05E-08 20STO STO dual channel PLd, Cat 3 SIL CL2 7.05E-08 20STOSTO dual channel +periodical testingPLe, Cat 4 SIL CL3 1.04E-09 206.9.2 Enlosure6.9.3 WiringSince the servo amplifier meets enclosure IP20, you must select the enclosure ensuring asafe operation of the servo amplifier referring to the enclosure. The enclosure must meetIP54 at least.When using STO wiring leads outside the control cabinet, the cables must be laid durably(firmly), protected from outside damage (e.g. laying in a cable duct), in different sheathedcables or protected individually by grounding connection.Wiring remaining within the demanded enclosure must meet the requirements of the standardIEC 60204-1.S701x2-S724x2 Instructions Manual 41