Prevention Of Unexpected Start-Up (Pous) - ABB FSO-21 User Manual

Prevention of unexpected start-up (POUS)

The POUS function prevents the machine from starting unexpectedly. The POUS
function activates the Safe torque off (STO) function in the drive.
WARNING! The situations in which you can use the POUS function must
always be based on a risk assessment (see IEC 60204-1:2016).
For more information on the STO function in the ACS880 drives, see the drive
hardware manual.
The operation of the POUS function is described in the time diagram and table below.
For configuration, see section
Motor speed
1
A POUS delay for completion (parameter POUS.13): An additional security delay. The
POUS completed indication (parameter POUS.22) goes on after this delay.
Configuring POUS
POUS.13
A
2 3
Safety functions 145
on page 308.
5 6
4
Time
POUS request
Drive STO state
& indication
POUS active
indication
POUS completed
indication