Cla-Val 350-01/3650-01 - Manual (Page 23)

Loss of Signal Conditions.
The actuator will respond differently during loss of signal
conditions. It will lock in place, rotate fully to the lowest limit
of actuator travel (zero position) or rotate fully to the highest
limit of actuator travel (span position). A loss of signal condition
occurs when the setpoint signal or the process variable is not
present. Default setting is lock in place.
Setpoint Command Signal.
The setpoint command signal can accept a 4 – 20 mA
current loop, 0 – 5 volt, 0 – 10 volt or a local setpoint.
Default setting is with 4 – 20 mA enabled.
SW - 2 SW- 3 LOS Function
UP UP The actuator will lock in place during
LOS conditions.
DOWN UP The actuator will go to the minimum zero
CCW position during LOS conditions
UP DOWN The actuator will go to the maximum
span CW position during LOS condition
Switch number Enable Function
SW1 – 5 DOWN Used to enable the 0 - 5 V setpoint (this
must be used in conjunction with SW1 – 7
which must be down)
SW1 – 6 DOWN Used to enable the 4 to 20 ma setpoint
SW1 – 7 DOWN Used to enable the 0 to 10 v setpoint (this
must be used in conjunction with SW1 – 5
which must be up)
SW1 – 8 DOWN Used to enable the local setpoint. In this
mode the actuator will use a manually
adjusted setpoint.
Setup Mode.
The setup of the actuator consists of the setting the lowest
limit of actuator travel (zero position), the highest limit of
actuator travel (span position), the minimum process variable
range limit and the maximum process variable range limit.
Placing switch #4 (setup mode) in the down position enables
the setup mode. Actuator travel can then be increased using
the blue push button and decreased using the yellow push
button to any position.
While in this mode, all remote commands given to the
actuator will be temporarily disabled.
Setting the minimum actuator position.
External Process variable
Position the actuator using the increase or decrease push
button to the desired minimum position. Press the red
enable and the blue zero push buttons at the same time. The
LED light directly underneath the blue zero push button will
illuminate confirming the setting. Default setting is min-
imum CCW position.
Setting the maximum actuator position.
External Process variable mode
Position the actuator using the increase or decrease push
button to the desired maximum position. Press the red
enable and yellow span push buttons at the same time. The
LED adjacent to the yellow span push button will illuminate
confirming the setting. Default setting is 8 turns from
minimum CCW position.
Setting the 4 milliamp actuator position
internal potentiometer mode (if used)
Position the actuator to the minimum system value using
the increase or decrease push button. Press the red
enable and the blue zero push buttons at the same time.
This sets the value at 4 mA.
Setting the 20 milliamp actuator position
Internal potentiometer mode (if used)
Position the actuator to the maximum system value using
the increase or decrease push button. Press the red
enable and the yellow span buttons at the same time. This
sets the valve 20 mA.
It is highly recommended that a minimum of one pilot
spring revolution be used between the 4 and 20 milliamps
values.
Setting the minimum process variable limit.
External process variable mode only
Method one: Using the system process variable.
Set the minimum process variable limit by reducing the actual
system dynamic (i.e. pressure, flow etc.) to the desired
value. This can be done by pressing the actuator increase or
decrease push button to attain the desired minimum
process variable. When achieved, press the red enable and
black LS1 push buttons at the same time. The LED adjacent
to the black LS1 push button will illuminate confirming the
setting. Default setting is 4 mA.
Method two: Applies only to external PV using a milliamp
calibrator (if process variable cannot be changed or is not in
service).
Disconnect the actual process variable wires located on the
logic board (including jumper on terminals 11 and 12 if
used) and connect a milliamp calibrator to the process vari-
able input terminals 10 (+) and 11 (-). Use a milliamp value
corresponding to the desired minimum process variable limit
(i.e. 25 psi = 8 mA, if transducer range is 0 -100 psi). This
must be at least 4 mA. Press the red enable and black LS1
push buttons at the same time. The LED adjacent to the
black LS1 push button will illuminate to confirm the setting.
Default setting is 4 mA.
3