Implementing The Safe Torque Off Function; Implementing The Prevention Of Unexpected Start-Up Function; Cabinet-Installed Multidrives; Multidrive Modules - ABB ACS880 Manual

Implementing the Safe torque off function

The safe torque off (STO) input is available as standard in all inverter units. See the
inverter unit hardware manual for implementing the Safe torque off function.
Implementing the Prevention of unexpected start-up
function

Cabinet-installed multidrives

￭
You can order the drive with a Prevention of unexpected start-up (POUS) function.
The POUS function disables the control voltage of the power semiconductors of the
drive (inverter) output stage. This prevents the drive from generating the torque
required to rotate the motor. POUS enables a short-time maintenance work (like
cleaning) on the non-electrical parts of the machinery without switching off and
disconnecting the drive.
See the appropriate option manual for more information.
Name
Prevention of unexpected start-up (option +Q950) for ACS880 multidrives user's
manual
Prevention of unexpected start-up (option +Q957) for ACS880 multidrives user's
manual

Multidrive modules

￭
POUS is not available as an option from ABB. The cabinet builder can use the Safe
torque off function of the inverter modules to implement the Prevention of unexpected
start-up function.

Implementing the Safely-limited speed function

Cabinet-installed multidrives
￭
You can order the drive with Safely-limited speed function with the encoder interface
(option +Q965). The function enables the user to safely operate close to the machine
by lowering the speed automatically.
For multidrives, there is also a version without the encoder interface available (option
+Q966).
See the appropriate option manual for more information.
Name
Safely-limited speed with the encoder interface (option +Q965) for ACS880 multid-
rives user's manual
Safely-limited speed without the encoder interface (option +Q966) for ACS880
multidrives user's manual
Multidrive modules
￭
Safely-limited speed function is not available as an option from ABB. However, the
cabinet builder can implement it with an optional safety module available from ABB.
See Implementing the functions provided by the FSO safety functions module (page
Electrical planning guidelines 43
Code
3AUA0000145934
3AUA0000119894
Code
3AXD50000019728
3AUA0000145935
44).