• The contacts of the switch or relay must open/close within 200 ms of each other.
￭ Cable types and lengths
• Double-shielded twisted-pair cable is recommended.
• Maximum cable lengths:
• Frames R0…R2: 100 m (330 ft) between activation switch [K] and drive control
board
-
- Frames R3…R8: 300 m (1000 ft) between activation switch [K] and drive control
board
• 60 m (200 ft) between external power supply and control board
Note:
A short-circuit in the wiring between the switch and an STO terminal causes a dangerous
fault. Therefore, it is recommended to use a safety relay (including wiring diagnostics) or a
wiring method (shield grounding, channel separation) which reduces or eliminates the risk
caused by the short-circuit.
Note:
The voltage at the STO input terminals of the drive must be at least 13 V DC to be interpreted
as “1”.
The pulse tolerance of the input channels is 1 ms.
￭ Grounding of protective shields
• Ground the shield in the cabling between the activation switch and the control board at
the control board only.
• Ground the shield in the cabling between two control boards at one control board only.
The Safe torque off function 153
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