30 Safety information and considerations
the application needs. For example, Active high is suitable for the SLS indication and
Active low for the SBC output. The FSO module operates according to the de-
energize to 0 V principle, which means that in case of power loss or Fail-safe
situation, the outputs will go to the low state (0 V).
Acknowledgement
Safety functions have four acknowledgement methods for entering the Operational
state (during the first start-up or after a safety function request is removed):
•
Manual
(recommended)
:
The user must first acknowledge the FSO locally from
the FSO I/O to allow the drive to restart.
•
Automatic:
The FSO grants the drive permission to restart after a safety function
request is removed or the start-up is complete. If the drive is in the automatic start
mode, it starts automatically, which may cause danger.
•
From a safety PLC
: The FSO module expects an external acknowledgement
signal from a safety PLC via the PROFIsafe communication bus.
•
Manual or from a safety PLC:
The FSO module expects an external
acknowledgement signal either from the FSO I/O or from a safety PLC.
The acknowledgement method can be selected separately for the start-up, the STO
(SSE and SS1 always end in drive STO), SLS and POUS safety functions.
For more information, see section
.
WARNING!
If the FSO module has the automatic acknowledgement in use,
make sure that it does not cause an unacceptable risk, for example, due to an
automatic start of the drive.
Motor speed feedback
FSO module needs motor speed feedback to perform safety functions. It can be
either a measured speed from a safety encoder or a safe speed estimate. With
FSO-12 module only safe speed estimate is available. Depending of the motor speed
feedback, safety functions operate slightly differently (for example, when the
indications turn on and off) due to inaccuracy in safe speed estimate. The feedback
type has also an effect on how the safety functions are configured. See chapter
for more information on the difference between the measured speed
feedback (encoder) and safe speed estimate.
Note:
With safe speed estimate, the FSO module and the drive motor control have an
independent motor model of their own. The accuracy of these two speed estimates
can differ from each other, especially in the low speed region.
Содержание FSO-12
Страница 1: ... OPTIONS FOR ABB DRIVES FSO 12 safety functions module User s manual ...
Страница 4: ......
Страница 12: ...12 Table of contents ...
Страница 26: ...26 Introduction to the manual The PROFIsafe certificate for the FSO 12 module is attached below ...
Страница 36: ...36 Safety information and considerations ...
Страница 136: ...136 Safety functions ...
Страница 196: ...196 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Страница 200: ...200 PROFIsafe ...
Страница 326: ...326 Start up ...
Страница 386: ...386 Dimension drawings ...