TM
Page 24
Reference manual Foundation Fieldbus Control module
DOC.RM.QC34.E Rev: A
October, 2006
4.2.3.3 SHUTDOWN-CFG
Shutdown configuration controls the behaviour of the
FieldQ
™
actuator in case of an internal communica-
tions failure in the QC34 module. This is independent
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
FieldQ
™
IOM manual, chapter 2.2 (DOC.IOM.Q1).
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
parameter SHUTDOWN_ACTION will be executed.
Auto Recovery : When the internal failure is solved,
the actuator will automatically go to its current
setpoint 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 reseting the shutdown status this param-
eter must be set to Reset. When this reset is com-
pleted succesfully, the SHUTDOWN_STATUS param-
eter will be FieldQ operational and
SHUTDOWN_RESET parameter will return to
inactive.
Disable : Shutdown functionality is not operational,
the actuator will stay in its last position after an
internal 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 4.3 and 4.4.
2 Factory default Shutdown configuration setting
(see figure 4.4):
SHUTD-ENABLE : Enable, Manual
Recovery
SHUTDOWN_ACTION : Close
SHUTDOWN_DELAY_TIME : 4 seconds
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 default position in
"SHUTDOWN_ACTION" is not automatically reversed
I/O Failure
XD_ERROR = “I/O Failure”
Delay time as set in
SHUTDOWN_DELAY_TIME
SHUTDOWN_STATUS
Changes to
FieldQ shutdown
After internal communications
are re-estabished, the
actuator/valve unit will
automatically go to its current
setpoint position.
Fig 4.3 Shutdown configuration, Enable,
Auto recovery
SHUTD-ENABLE =
‘Enable, Auto recovery'
SHUTDOWN_ACTION =
- open
- close
- hold
I/O Failure
XD_ERROR = “I/O Failure”
Delay time as set in
SHUTDOWN_DELAY_TIME
SHUTDOWN_STATUS
Changes to
FieldQ shutdown
SHUTD-ENABLE =
‘Enable, Manual recover'
SHUTDOWN_ACTION =
- open
- close
- hold
SHUTDOWN_RESET
After internal communications
are re-established, the
shutdown status must be
manually reset using the
SHUTDOWN_RESET
parameter.
Fig. 4.4 Shutdown configuration, Enable,
Manual recovery
