Dwyer 275 - Manual (Page 8)

1. Push <DOWN> at PV_END mode and then TR_ZERO mode is
displayed.
2. Push <ENTER>. *R_ZERO mode is started and at this mode users
can adjust the zero point of the transmitter. Valve stem is moved to
zero point automatically.
3. Push <UP> or <DOWN>. The number on the LCD is changed and
the measured current value is changed accordingly on an ammeter
equipped outside. Adjust it to be 4mA and push <ENTER> to save
it. +R_ZERO message is displayed.
4. Push <ESC>. TR_ZERO mode is displayed.
5. Push <DOWN> at TR_ZERO mode. Then TR_END mode is
displayed.
(Push <ESC> twice to return to RUN Mode.)
6. Push <ENTER>. *TR_END mode is started and at this mode users
can adjust the end point of transmitter. Valve stem is moved to the
end point automatically.
7. Adjust measured current value to be 20 mA on ammeter with <UP>
or <DOWN> buttons. Push <ENTER> to save it. +R_END message
appears.
8. Push <ESC>. TR_END mode is displayed.
9. Push <ESC> twice to return to RUN mode.
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)
It is 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 field conditions and 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 <ENTER> at RUN mode for six seconds and then AUTO CAL
mode is displayed. Push <DOWN> four times to go into VALVE
mode.
2. Push <ENTER> and ACT RA (in case of RA) is displayed.
3. Push <ENTER> again, then *ACT RA is displayed.
4. Adjust to *ACT DA by pushing <UP> or <DOWN> and save it with
<ENTER>. +ACT DA message appears.
5. Push <ESC> three times to return to RUN mode.
Adjustment of Characteristics (CHAR)
1. Push <ENTER> at VALVE mode and then push <DOWN>. CHAR
LIN (in case of linear characteristics) mode is displayed.
2. Push <ENTER>. *HAR LIN mode is displayed and characteristics
can be adjusted at this mode.
3. Adjust Characteristics (ex: EQ) by pushing <UP> or <DOWN> and
save it with <ENTER>. +HAR EQ is displayed.
4. Push <ESC> three times to return to RUN mode.
page 8
100%
Strok
0
4 20
mA
Quick Open
Linear
EQ%
(1) Push <DOWN>. (2) Push <ENTER>. (3) Push <ENTER>
after adjustment with
<UP>, <DOWN>.
(4) Push <ESC>. (5) Push <DOWN>. (6) Push <ENTER>.
(7) Push <ENTER>
after adjustment with
<UP>, <DOWN>.
(8) Push <ESC>. (9) Push <ESC> twice.
RUN MODE.
(1) Push <DOWN>
four times. (2) Push <ENTER>. (3) Push <ENTER>.
(4) Push <ENTER>
after adjustment with
<UP>, <DOWN>.
(5) Push <ESC>
three times.
RUN MODE.
(1) Push <ENTER>. (2) Push <DOWN>. (3) Push <ENTER>.
(4) Push <ENTER>
after adjustment with
<UP>, <DOWN>.
(5) Push <ESC>
three times.
RUN MODE.