Know-how makes the difference
12
D) Special Signal Setting for Fully Open and Fully Closed
Auto-Full Switch
(Switch 3) On (up)
Signal: 4.3mA
Signal: 19.7mA
Fully Closed
Fully open
Auto-Full Switch
(Switch 3) Off
(down)
Signal: 4.0mA
Signal: 20.0mA
Fully Closed
Fully open
E) Auto Setting
This function is used for automatic setting of the PCU card to the predefined limits.
While the actuator is corrected mounted on the valve, check input power, input and output signal connections.
Press ASCAN button once, regardless of the position of the actuator, then the actuator will perform the Auto Setting motion:
1) The blue LED flicker
2) Opening (the red LED flickering) for 5 seconds
3) Pause for 2 seconds
4) Fully closing (the green LED flickering)
5) Pause (the green LED on) for 3 seconds
6) Fully opening (the red LED flickering)
7) Pause (the red LED on) for 3 seconds
8) Moving back to the previous position
NOTE: Since the unit is already set at the factory, no further setting is
required unless the user has adjusted the mounting state of Limit Switch or the Potentiometer.
ASCAN
Button
F) Manual Operation
This function allows the user to manually operate the actuator.
To access this function, press the ZERO (black) and SPAN (white) buttons simultaneously for 2 seconds and the yellow LED will be lit to
indicate that the actuator is in Manual Operation mode
Pressing the ZERO button will move the actuator to close and pressing the SPAN button will move the actuator to open
If no operation occurs within 5 seconds, the PCU automatically terminates the Manual Operation mode or alternatively press the ZERO
and SPAN buttons simultaneously for 2 seconds. In either case, the yellow LED will be lit off to indicate the termination of the Manual
Operation Mode.
NOTE: During the Manual Operation mode, the input signal is ignored.
ZERO
Button
SPAN
Button
G) Customizing Set-points (CH 1 Switch)
- This function is used when the user wants to set different set-points for fully
open and fully closed positions.
- For example, if the user wants to assign 5mA as the set-point for fully
closed position, first of all switch-on (move up) the CH1 switch (switch 4).
Supply a 5mA signal and push the ZERO button once. Hereafter, the actua-
tor will acknowledge 5mA signal as the set-point for fully closed position and
transmits 4mA feedback signal. Similarly, for setting the set-point for the fully
open position, supply the desired signal (for example, 19mA) and push the
SPAN button once. Switch-off (move down) the CH 1 switch to complete the
setting.
ZERO
Button
SPAN
Button
CH 1 Switch
(Switch 4)
SET-Pwoints
ADJUSTABLE RANGE
Fully Closed
3-8 mA
Fully Open
16-21 mA
