Safe torque off function 219
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.
• In case 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 or an FPTC-0x thermistor protection module can
also be used. For more information, see the FSO-xx module documentation.
Cable types and lengths
We recommend double-shielded twisted-pair cable (see page 67).
Maximum cable lengths:
• 300 m (1000 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 control unit 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.
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