ABB ACS880 Series, Руководство пользователя

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Option description and instructions 13
Operation principle

Time scheme
This time scheme diagram illustrates the operation of the POUS function. This safety
function uses the POUS function of the FSO module. For more information, see the FSO
module user’s manual.
A POUS indication delay (see parameter POUS.13 ): An additional security delay. The POUS
completed indication (parameter POUS.22 ) becomes active after this delay.
Step Description
1 The user stops the motor(s).
2 After the motor(s) have reached the zero speed, the user switches the POUS switch off (open). The
FSO module activates the inverter unit STO function.
Note : If the user activates the POUS function when the motor is running, the FSO module activates
the inverter unit STO function, the motor(s) coasts to a stop and the FSO module generates a fault.
3 After time A has elapsed, the POUS indication lamp turns on (POUS completed indication).
4 The user switches the POUS switch on (closed). The FSO module deactivates the inverter unit STO
function and turns off the POUS indication lamp. The user can start the motor(s) again.
Note : In this case, automatic acknowledgement of the POUS function is selected (parameter
POUS.02 ).
5 The user restarts the motor(s).
1
2 4
POUS switch
(POUS request)
STO status
(POUS status)
A
POUS
indication lamp
3 5
Motor speed
Time