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.
• A CPTC-02 thermistor protection module can 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 (1000 ft) between activation switch [K] and drive control unit
• 60 m (200 ft) between multiple drives or inverter units
• 60 m (200 ft) between external power supply and first 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.
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.
The Safe torque off function 247
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