PROPORTIONAL
BAND (P.BND)
Proportional Band
(P.BND) is not active unless your meter has analog output and relay
capabilities. The menu will display whether analog output is present or
not.
A proportional controller's output is linearly proportional to the
change of the error signal, whenever the signal is within 2 prescribed
values (Proportional Band).
There are three (3) points of interest on the proportional controller
transfer curve.
The first is the magnitude of the error signal that drives the controller
to ôfull onö (e.g. 20 mA out for 4-20 mA).
The second point of interest is the magnitude of the error signal
that drives the controller output to ôfull offö (e.g. 4 mA out on 4-20
mA). These two (2) points need not be equally spaced on either side
of the zero error point.
The third is the factor "Offset" and it is the output value of the
controller which causes zero error.
The above example illustrates the parameters for the 4-20mA analog out,
likewise, analog voltage output will have these (3) points of interest.
If A is the
controller gain the,
| Proportional
Band = |
Max.
out - Min. out
|
| |
A
|
CONTROLLER OUT
= A* ERROR + OFFSET
To select the proportional band for your proportional controller, follow
these steps:
1. Press the MENU button until the meter shows "P.BND".
2. Press the  /DEV
button. The meter shows the last previously stored 4- digit number (0000
through 9999) with flashing 4th digit.
3. Press the  /MAX
button to change the value of the flashing digit. If you continue to press
the /MAX
button, the flashing digit's value continues to change.
4. Press the /DEV
button to scroll to the next digit.
5. Press the MENU button to store your selection. The meter
momentarily shows "STRD", followed by "M.RST" (Manual Reset).
 ôP.BNDö
displays only if you select analog output as proportional.
MANUAL
RESET (M.RST)
Manual Reset (M.RST) is not active unless your meter has analog
output capabilities. The menu will display whether analog output is present
or not. This feature allows you to offset the error that may occur within
your setpoint. In order to determine the amount of error, you must compare
your display value to the setpoint 1 value. The difference between these
two values is the amount of error that you may want to enter into Manual
Reset (M.RST).
1. Press the MENU button until "M.RST" displays.
2. Press the /DEV
button. The meter shows the last previously stored 4-digit number (-1999
through 9999) with flashing 4th digit.
3. Press the /MAX
button to change the value of the flashing digit. If you continue to press
the /MAX button,
the flashing digit's value continues to change.
4. Press the /DEV
button to scroll to the next digit.
5. Press the MENU button to store your selection. The meter
momentarily shows "STRD", followed also momentarily by "RST"
(Reset). Then ôCJ.OFö (Cold Junction Offset) displays (refer to
Section 19).
"M.RST" displays only if you select analog output
as proportional. Always choose the value of "M.RST" less than "P.BND/2".
Meter will not accept larger values and displays with flashing "ER
4".
OUTPUT
SCALE AND OFFSET ("OT.S.O")
Output Scale and Offset
("OT.S.O") is not active unless your meter has analog output capabilities.
The menu will display whether analog output is present or not. Output
Scale and Offset ("OT.S.O") scales your analog output to be equal
to the meter's display and/or any engineering units you require. You may
scale the output for direct (4-20 mA, 0-10 V, etc) or reverse acting (20-4
mA, 10-0 V, etc).
"OT.S.O"
only shows if you select analog output as a retransmission of temperature.
1. Press the
MENU button until "OT.S.O" displays.
2. Press the /DEV
button. "RD 1" (Read 1)
This is your first point of display reading.
3. Press the /DEV
button again. The meter shows the last previously stored 4-digit number
(-1999 through 9999) with flashing 4th digit.
4. Press the /MAX
button to change the value of Read 1.
5. Press the /DEV
button to scroll to the next digit.
6. Press the MENU button to store your selection.The meter
shows "OUT.1" (Output 1) displays.
Note: This starting analog signal corresponds to your
Read 1 display.
7. Press the /DEV
button. The meter shows selected output.
If you select "O.2=V" for voltage, the maximum signal you may select
is 10.00 for an 0-10 V dc signal output. If you select "O.2=C"
for current, the maximum signal you may select is 19.99 for a 0-20 or
4-20 mA dc signal output.
8. Press the /MAX
button to enter the Output 1 signal selection. If you continue to press
the /MAX button,
the flashing digit's value continues to change.
9. Press the /DEV
button to scroll to the next digit.
10. Press the MENU button to store your selection. The display
shows "RD 2" (Read 2).
This is your second point of display reading.
11. Press the /DEV
button. The meter shows last previously stored 4-digit number (-1999 through
9999) displays with flashing 4th digit.
12. Press the /MAX
button to change the value of the flashing digit. If you continue to press
the MAX button,
the flashing digit's value continues to change.
13. Press the /DEV
button to scroll to the next digit.
14. Press the MENU button to store your selection. "OUT.2"
(Output 2)displays.
This
analog signal should correspond to your Read 2 display.
15. Press the /DEV
button. Selected output displays.
If you select "O.2=V" for voltage, the maximum signal you may
select is 10.00 for an 0-10 V dc signal output. If you select "O.2=C"
for current, the maximum signal you may select is 19.99 for a 0-20 or
4-20 mA dc signal output.
16. Press the
MAX
button to change the
value of the flashing digit. If you continue to press the MAX
button, the flashing digit's value continues to change.
17. P ress the
/DEV
button to scroll to the next digit.
18. Press the MENU button to store your selection. The meter
momentarily shows "STRD", followed also momentarily by "RST"
(Hard Reset). "CJ.OF" (Cold Junction Offset) then displays.
WARNING:
If the meter displays
all flashing values
on any item, the value
has overflowed. Press
the MAX
button to start new
values.
|
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