Hardware Manual

Safe Torque off function 231
 Activation switch
In the wiring diagrams below, the activation switch has the designation (K). This
represents a component such as a manually operated switch, an emergency stop
push button switch, or the contacts of a safety relay or safety PLC.
• If a manually operated activation switch is used, the switch must be of a type 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 can also be used. For more information, see
the FSO-xx 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 drive.
Note that the voltage at the INx terminals of each drive must be at least 17 V DC to be
interpreted as “1”.
 Grounding of protective shields
• Ground the shield in the cabling between the activation switch and the control unit
at the control unit.
• Ground the shield in the cabling between two control units at one control unit only.