ABB FSO-12, Руководство пользователя

Страница: 50 / 388

50 Safety functions
Limit hit : If the motor speed hits a ramp monitoring limit, the FSO module activates
the STO function and generates an event. The user can select the event type
(warning, fault or event) with parameter
FSOGEN.62 STO indication safety limit .

Function indications
The logic state of output indication signals can be configured to be active low or
active high.
STO, SS1, SSE, POUS
States of the configured and connected functions are indicated with FSO digital
outputs and fieldbus status signals when the function is started:
• Stopping functions (SSE and SS1) are always started and indicated immediately
(the monitoring method depends on the configuration)
(parameters
SSE.21 SSE output and SS1.21 SS1 output ).
• The drive STO state is indicated when the drive STO circuit is open
(parameter STO.21 STO output ).
Note : When the SBC is activated before the drive STO, the drive STO is indicated
after a delay (parameter SBC.12 STO SBC delay ).
• POUS function is indicated immediately when requested from an input
( POUS.21 POUS output ).
• Ramp monitoring (SAR0 and SAR1, see section Configuring SAR on page 257 ) is
not indicated.
The FSO module switches off the digital output indications (SSE, SS1 and POUS
functions) when the function is acknowledged.
Stop completed indications are activated when the stopping function has completed,
but is not yet acknowledged. There are separate indications for each stopping
function STO, SSE and SS1 (parameters
STO.22 STO completed output , SSE.22
SSE completed output , SS1.22 SS1 completed output ) and one common for all of
them (parameter FSOGEN.11 Stop completed output ). The FSO module switches off
the indications when the function is acknowledged.
The completed indication of the POUS function (parameter POUS.22 POUS
completed output ) is activated after the time defined by parameter POUS.13 POUS
delay for completion has passed. The FSO module switches off the completed
indication when the POUS request is removed.
SLS, Variable SLS
• SLS indication starts when the motor speed is in the monitored range. The FSO
module switches off the indication when the function is acknowledged or the
monitored speed exceeds the user-defined limit (this also causes the SLS to trip,
that is, the FSO module activates the SSE function).