Safety PLC2
Safety relayK
Wiring with external power supply
2414
2313 Y1
A2
Y2
A1
31
32
OUT
GND
K
- +
2
24 V DC
1
OUT134
OUT235
SGND36
IN137
IN238
STO
Drive1
Safety PLC2
Safety relayK
￭
Activation switch
In the wiring diagrams, 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.
￭
Cable types and lengths
• ABB recommends double-shielded twisted-pair cable.
• Maximum cable lengths:
• 300 m (1000 ft) between activation switch [K] and drive control unit
• 60 m (200 ft) between external power supply and control unit
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.
The Safe torque off function 197
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