ABB ACS880-17 - Multiple Drives (External Power Supply)

204 The Safe torque off function
 Multiple drives (external power supply)
Operation principle
1. The Safe torque off activates (the activation switch is opened, or safety relay contacts
open).
2. The STO inputs on the motor-side converter control unit de-energize.
3. The control unit cuts off the control voltage from the drive IGBTs.
OUT1
SGND
IN1
IN2
OUT1
SGND
IN1
IN2
OUT1
SGND
IN1
IN2
Motor-side
converter
control unit
24 V DC
–+
K
Motor-side
converter
control unit
Motor-side
converter
control unit
ACS880-17
ACS880-17
ACS880-17