Default value: I/O interface
Setting values:
I/O interface
The failure behaviour is initiated in case of setpoint loss (setpoint position, process
setpoint, actual process value).
The monitoring depends on the preset setpoint range, e.g.:
●
Setpoint = 4 – 20 mA, E1 lower than 3.7 mA = loss of signal
●
Setpoint = 10 – 20 mA, E1 lower than 9.7 mA = loss of signal
Information
●
For a setpoint range of 0 – 20 mA , monitoring is not possible.
●
Actuator controls will only respond to a setpoint signal loss, if a signal is present
at the MODE input, i.e. actuator controls are in operation mode Remote SET-
POINT (setpoint control).
9.2.3. Failure operation (reaction of the actuator) on loss of signal
The failure operation determines which action is executed by the actuator once the
failure behaviour is initiated.
Customer settings M0041
Failure behaviour M0378
Failure operation M0384
Default value: STOP
Setting values:
STOP
The actuator stops in the current position.
CLOSE
The actuator runs to end position CLOSED.
OPEN
The actuator runs to end position OPEN.
Approach position
The actuator runs to the predetermined position. Conditions:
●
The function <Positioner> is activated.
●
Parameter Source M0385 is set to I/O interface
Execute last CMD
The actuator executes the last operation command before it is stopped.
If the last operation command was a setpoint definition via analogue input (AIN 1/AIN
2), the lower limit of the setpoint position is used (parameter Low limit AIN 1/Low
limit AIN 2).The actuator is operated to the defined end position, usually end position
CLOSED.
Behaviour depending on the selector switch position:
Once the failure operation is triggered, the defined position is approached. If the
actuator is then moved to another position (e.g. by manual operation), it will try to
perform the set failure operation while the selector switch is in position Remote
control (REMOTE).
Information
To prevent a new approach to the failure position during manual operation, the se-
lector switch must be set to position Local control (LOCAL) or 0 (OFF) prior to
operating the handwheel.
9.2.4. Failure position: define
If the failure operation Approach position is set, the actuator moves to the failure
position indicated here.
Required access level: Specialist (4) or higher.
Customer settings M0041
Failure behaviour M0378
Fail.pos.OPEN CLOSE M0387
Default value: 50.0 %
Setting range: 0.0 ... 100.0 % (from end position OPEN to CLOSED)
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Actuator controls
Failure functions ACV 01.2/ACVExC 01.2