Dwyer 285 - Manual (Page 7)

Parameter Mode (PARAM)
Parameter Types
There are four parameter modes: Dead Zone, KP, KI, and KD.
These values are reflected as soon as they are changed, therefore the appropriate
values are found by checking the valve’s motion in real time.
Adjustment of Dead Zone (dEAdZONE)
This is the range of error % that the positioner is not adjusted. Hunting or oscillation
due to friction between the stem and packing is prevented by this parameter.
1. Press and hold at RUN mode for 6 seconds and AUTO CAL
message appears.
2. Scroll with until PARAM mode is displayed.
3. Push and dEAdZONE mode is displayed.
4. Push again and *EAdZONE message appears.
5. Adjust dEAdZONE value by pushing or . Adjusted valued is
applied immediately without additional operation. Users can easily check its
adjustment by changing the current input signal to the positioner. Optimum
control value is found by adjusting values during the valve operation.
6. Push to save the value. +EAdZONE message appears on LCD.
7. Push to exit dEAdZONE mode.
KP
1. Press and hold at RUN mode for 6 seconds and AUTO CAL
message appears.
2. Scroll with until PARAM mode is displayed.
3. Push and dEAdZONE mode is displayed.
4. Scroll with until KP mode is displayed.
5. Push at KP mode and *KP message appears on LCD.
6. Adjust KP value with or . Adjusted value is applied immediately
without additional operation. Users can easily check its adjustment by changing
the current input signal to the positioner. Optimum control value is found by
adjusting the values during valve operation.
7. Push to save the value and +KP message appears on LCD.
8. Push to exit KP mode.
PT
1. Press and hold at RUN mode for 6 seconds and AUTO CAL
message appears.
2. Scroll with until PARAM mode is displayed.
3. Push and dEAdZONE mode is displayed.
4. Scroll with until PT mode is displayed.
5. Push at PT mode and *PT message appears on LCD.
6. Adjust PT value with or . Adjusted value is applied immediately
without additional operation. Users can easily check its adjustment by changing
the current input signal to the positioner. Optimum control value is found by
adjusting the values during valve operation.
7. Push to save the value and +PT message appears on LCD.
8. Push to exit KP mode.
HAND CAL
When auto calibration is started, Series 185 and 285 positioners set zero points
and end points based on full stroke. HAND CAL allows for user defined zero and
end points.
Hand Calibration Types
PV_ZERO: Edit mode to change the zero point of valve.
PV_END: Edit mode to change the end point of a valve.
TR_ZERO: Edit mode to change the zero point of transmitter.
TR_END: Edit mode to change the end point of transmitter.
Adjustment of valve zero point (1 to 5) and end point (6 to 10).
PV_ZERO
1. Press and hold at RUN mode for 6 seconds and AUTO CAL
message appears.
2. Scroll with until HAND CAL mode is displayed.
3. Push and PV_ZERO mode is displayed.
4. Push at PV_ZERO mode and *PZ mode is started. The valve stem
will move automatically to the current zero point. On the LCD, the valve stroke
is displayed as 0%. *PZ indicates the zero point is ready to be set.
5. Adjust valve stem by pushing or . When valve stem is at the
desired zero point, save it by pushing .
6. Push to exit PV_ZERO mode.
PV_END
1. To change valve end point, scroll with at HAND CAL menu and select
PV_END.
2. Push at PV_END mode and *PE mode is displayed. The valve stem
will move automatically to the current end point. On the LCD, the valve stroke
is displayed as 100%. *PE indicates the end point is ready to be set.
3. Adjust valve stem by pushing or . When the valve stem is at
the desired end point, save it by pushing .
4. Push to exit PV_END mode.
6 seconds 6 seconds
/
then 3 times
COMPLETED
3 times
/
then 3 times
COMPLETED
7 times
/
then 3 times
COMPLETED
6 seconds 3 times
/
then
/
then
COMPLETED