Activation Switch; Cable Types And Lengths - ABB ACS560 Hardware Manual

152 Safe torque off function
Drive
34 OUT1
OUT2
35
36 SGND
IN1
37
IN2
38
STO line example of external +24V DC power supply is shown as follows.
Drive
34 OUT1
35 OUT2
36 SGND
IN1
37
IN2
38
For the information of STO input specification, see Chapter
data (page 121).
￭

Activation switch

In the wiring diagram above
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.
• Inputs IN1 and IN2 must open/close within 200 ms of each other.
￭

Cable types and lengths

• Double-shielded twisted-pair cable is recommended.
• Maximum cable length 300 m (984 ft) between activation switch (K) and drive 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
13 23 31
14 24 32
+24V DC external
power supply
- +
13 23 31
14 24 32
(Wiring examples (R3-R8) (page
Safety PLC
OUT
Y1 Y2
K
Safety relay
A1 A2
Y1 Y2
K
Safety relay
A1 A2
Control connection
151)), the activation switch has
GND
Safety PLC
OUT
GND