180 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/DCS880 drives, see the
corresponding drive hardware manual.
The operation of the POUS function is described in the time diagram and table below.
For configuration, see section Configuring POUS on page 376.
A POUS delay for completion (parameter POUS.13): Sets a delay for POUS completed
indication. The POUS completed indication (parameter POUS.22) goes on after this
delay.
Note: POUS function does not activate SBC function, even if SBC is configured into use
together with the STO function.
1
2
4
Drive STO state
& indication
A
POUS active
indication
POUS request
6
5
3
POUS completed
indication
POUS.13
Motor speed
Time
To Next Page
Loading...
