Safe torque off function 141
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 CPTC-02 thermistor protection module can also be used. For more information,
see section CPTC-02 ATEX-certified thermistor protection module, (external
24 V AC/DC and isolated PTC interface) on page 172.
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
• 60 m (200 ft) between external power supply and first drive.
Note: 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.
Single drive (internal power supply)
OUT2
OUT1
+ 24 V DC
IN1
IN2
T1/U,
T2/V,
T3/W
Control unit
SGND
+ 24 V DC
STO
UDC+
UDC-
A
Drive
34
35
36
37
38
Control logic
K
To Next Page
Loading...
