Emerson Bettis Q Series Reference Manual page 27

Reference manual F
DOC.RM.BQC54.E Rev: 1
February, 2016
4.2.3.3 SHUTDOWN-CFG
Shutdown configuration controls the behavior of the
Bettis Q-Series actuator in case of an internal com-
™
munications failure in the QC54 module. This is inde-
pendent of the FF communication on the bus line.
This set of parameters can overrule the Failure
modes of the basic actuator, as described in the
Bettis Q-Series IOM manual, chapter 2.2 (DOC.
™
IOM.BQ1).
1 General working of Shutdown configuration.
Shutdown configuration can work in three configura-
tions, as set by the SHUTDOWN_ENABLE param-
eter:
- Enable, auto recovery
- Enable, manual recovery
- Disable.
Enable : After an internal failure, the setting of pa-
rameter SHUTDOWN_ACTION will be executed.
Auto Recovery : When the internal failure is solved,
the actuator will automatically go to its current set
point position.
Manual Recovery : When the internal failure is
solved, the actuator shutdown status must be manu-
ally reset.
Normally the SHUTDOWN_RESET parameter is
inactive. For resetting the shutdown status this
parameter must be set to Reset. When this reset is
completed successfully, the SHUTDOWN_STATUS
parameter will be Device operational and SHUT-
DOWN_RESET parameter will return to inactive.
Disable : Shutdown functionality is not operational,
the actuator will stay in its last position after an inter-
nal failure.
Parameter SHUTDOWN_DELAY_TIME defines a
delay time (up to 4 minutes and 15 seconds) between
the time the internal failure is detected by transducer
block parameter XD_ERROR (I/O Failure) and the
time that the unit will go in "Shutdown".
The sequence of events for 2 shutdown configura-
tions is shown in figures 4.4 and 4.5.
2 Factory default Shutdown configuration setting
(see figure 4.5):
SHUTD-ENABLE
SHUTDOWN_ACTION
SHUTDOWN_DELAY_TIME : 5 seconds
Fieldbus Control module
OUNDATION
: Enable, Auto Recov-
ery
: Default (pilot valve
de-energized)
I/O Failure
SHUTDOWN_STATUS
Changes to
Bettis Q-Series shutdown
SHUTDOWN_ACTION =
- open
- close
- hold
Fig 4.4 Shutdown configuration, Enable,
Auto recovery
I/O Failure
SHUTDOWN_STATUS
Changes to
Bettis Q-Series shutdown
SHUTDOWN_ACTION =
- open
- close
- hold
Fig. 4.5 Shutdown configuration, Enable,
Manual recovery
Default shutdown configuration
* Means that 4 seconds after an internal failure is detected,
DOUBLE ACTING AND SPRING RETURN (Single acting)
actuators will go to the closed position, when pressure is
available at the actuator,
and
* After the internal communications are re-established, the
shutdown status must be reset.
Important
* If feedback is reversed, the SHUT-DOWN_ACTION is
following the latest feedback switch points automatically.
XD_ERROR = "I/O Failure"
Delay time as set in
SHUTDOWN_DELAY_TIME
SHUTD-ENABLE =
'Enable, Auto recovery'
After internal communications
are re-established, the actua-
tor/valve unit will automatically
go to its current set point
position.
XD_ERROR = "I/O Failure"
Delay time as set in
SHUTDOWN_DELAY_TIME
SHUTD-ENABLE =
'Enable, Manual recover'
SHUTDOWN_RESET
After internal communications
are re-established, the shut-
down status must be manually
reset using the SHUTDOWN_
RESET parameter.
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