Safe Torque off function 237 Activation switchIn the wiring diagrams below, the activation switch has the designation (K). Thisrepresents a component such as a manually operated switch, an emergency stoppush button switch, or the contacts of a safety relay or safety PLC.• In case a manually operated activation switch is used, the switch must be of atype that can be locked out to the open position.• The contacts of the switch or relay must open/close within 200 ms of each other.• An FSO-xx safety functions module or an FPTC-0x thermistor protection modulecan also be used. For more information, see the module documentation. Cable types and lengths• Double-shielded twisted-pair cable is recommended.• Maximum cable lengths:• 300 m (984 ft) between activation switch [K] and drive control unit• 60 m (200 ft) between multiple drives• 60 m (200 ft) between external power supply and first driveNote: The voltage at the INx terminals of each drive must be at least 17 V DC to beinterpreted as “1”. Grounding of protective shields• Ground the shield in the cabling between the activation switch and the control unitat the control unit.• Ground the shield in the cabling between two control units at one control unit only. Single drive (internal power supply)
