6-24 Safe Torque OffAC30 series Variable Speed InverterSS1 IMPLEMENTATION USING SAFETY CONTROL UNITThis Safe Stop 1 (SS1) implementation causes the drive to come to rest in a controlled manner, and STO is actioned after a time delay determined bythe safety delay relay. This conforms to SS1 defined in EN61800-5-2:2007 para 4.2.2.3 c). The example shows wiring and terminal numbering for aSiemens 3TK2827, but similar products are available from other vendors. Use of this Siemens part does not imply it is suitable for the user’s application.The user must select and assess appropriate equipment.Note: On power-up, the Safety Control Unit outputs are OPEN; thus STO is requested of the inverter. This responds by energising KA1 if both channelsare active and healthy. KA1 is used as a self-check for the reset cycle of the Safety Control Unit. If a reset cannot be achieved due to KA1 being de-energised, a fault may be present and must be resolved by the user before relying on the STO function. See Fault Operation on page 6-14.A2 PE Y3324VDCSAFETYDEMANDKA1POWERSUPPLY SAFETY CONTROL UNITTHIS WIRING MUST BE WITHIN THE CONTROL CUBICLE.KA1INVERTER STORESETDRIVESTARTDRIVE STOPX13/02 X12/01 X10/01 X10/03 X10/06 X12/05X10/02 X10/04 X10/05 X12/06A1 Y10 Y11 Y12 Y21 Y22 13 47 57Y34 14 48 58
