132 Safety functions
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
on page
A
POUS delay for completion (parameter
): An additional security delay. The
POUS completed indication (parameter
) goes on after this delay.
1
2
4
Drive STO state
& indication
A
POUS active
indication
POUS request
6
5
3
POUS completed
indication
Motor speed
Time
Summary of Contents for FSO-12
Page 1: ... OPTIONS FOR ABB DRIVES FSO 12 safety functions module User s manual ...
Page 4: ......
Page 12: ...12 Table of contents ...
Page 36: ...36 Safety information and considerations ...
Page 136: ...136 Safety functions ...
Page 196: ...196 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Page 200: ...200 PROFIsafe ...
Page 326: ...326 Start up ...
Page 386: ...386 Dimension drawings ...