Dwyer 295 - Manual (Page 8)

Valve Mode
This mode adjusts the various characteristics.
Action Type (ACT)
It can be set to Direct Action (DA) or Reverse Action (RA).
Characteristics (CHAR)
Set Characteristics. There are three types of valve characteristics: Linear (LIN),
EQ% (EQ), and Quick Open (QO). The following is the example of the three
characteristic curves.
User Characteristics (USER SET)
When a specific characteristic is needed but not included in the above
characteristics, the user can make a specific characteristic curve by choosing 16
points voluntarily according to the field conditions the user’s need.
Tight Shut Open (TSHUT OP)
This allows the user to fully open valve at any value around the 20 mA current input
signal.
Tight Shut Close (TSHUT CL)
This allows the user to completely close valve at value around 4 mA input signal
from outside.
Split Range Control (SPLIT)
This allows the user to control entire stroke with input signals of 4 to 20 mA, 4 to
12 mA or 12 to 20 mA.
Adjustment of Acting Type (ACT)
1. Push at RUN mode for six seconds and then AUTO CAL mode is
displayed. Push four times to go into VALVE mode.
2. Push and ACT RA (in case of RA) is displayed.
3. Push again, then *ACT RA is displayed.
4. Adjust to *ACT DA by pushing or and save it with .
+ACT DA message appears.
5. Push three times to return to RUN mode.
Adjustment of Characteristics (CHAR)
1. Push at VALVE mode and then push . CHAR LIN (in case
of linear characteristics) mode is displayed.
2. Push . *HAR LIN mode is displayed and characteristics can be
adjusted at the mode.
3. Adjust Characteristics (ex: EQ) by pushing or and save it with
. + HAR EQ is displayed.
4. Push three times to return to RUN mode.
Adjustment of User Characteristics (USER SET)
1. Push at VALVE mode and ACT RA or ACT DA is displayed.
2. Push twice, then USER SET mode is started.
3. Push . *PO SET mode is displayed. In this mode, users can adjust the
first point of characteristic in 16 points. The number on the LCD is the valve stroke
percentage set to P0.
4. Adjust the valve stroke percentage using or .
5. Save it with . While P0 value is being saved, *P1 SET mode is
displayed.
6. *P1 SET mode is used to adjust the second point characteristic in 16 points.
Adjustment method is the same as P0* SET mode.
7. Save the valve stroke percentage from P2 to P15 SET mode, save it with
.
8. After adjustment of valve stroke percentage at *P15 SET mode, save it with
.
9. +SER SET is displayed. Sixteen points of valve stroke percentage are all set.
Push three times to return to RUN mode.
Adjustment of Tight Shut Open (t SHUT OP)
1. Push at VALVE mode and ACT RA or ACT DA is displayed. Push
three times at this mode. t SHUT OP is displayed.
2. Push . *SHUT OP mode is displayed, and in this mode users can set
stroke at the time of Tight Open. Initial setting is done at 100%, which means
cancellation of this function. Adjust the value (ex: 95.0%) by pushing or
and save it with . +SHUT OP is displayed.
3. Push three times to return to RUN mode.
Adjustment of Tight Shut Close (T SHUT CL)
1. Push at VALVE mode and ACT RA or ACT DA is displayed. Push
four times at this mode. TSHUT CL is displayed.
2. Push . *SHUT CL mode is displayed and in this mode users can set
stroke at the time of Tight Close. Initial setting is done as 0.3%. 0% means
cancellation of this function. Adjust the value (ex: .5%) by pushing or
and save it by pushing . +SHUT CL is displayed.
3. Push three times to return to RUN mode.
100%
Strok
0
4 20
mA
Quick Open
Linear
EQ%
Page 8
6 seconds 3 times
/
then 3 times
COMPLETED
/
then 3 times
COMPLETED
6 seconds 3 times
/
then
/
then
6 seconds
6 seconds 3 times
/
then 3 times
3 times
then
6 seconds 4 times
/
then 3 times
3 times
then