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60
A.
NECESSARY STEPS FOR TUNING THE PID CONTROLLER FOR PH AD-
JUSTMENT
1. The pH of the water source used for irrigation is measured. When this value is
smaller than the reference value (is acid), the substance from the tank used for
neutralization is going to be alkaline. In opposite case the neutralization sub-
stance is going to be acid.
2. Based on this measurement set the
S 51
panel of the controller (Use acid in
pHCtrl) with “
N
” (for an alkaline neutralization substance), and “
Y
” (for an
acid neutralization substance).
3. Proceed to panel
S 37
(PRE/POST IRRIG) and with the UP, DOWN arrows
select the irrigation program number 10. This program has as default settings
(given by the manufacturer):
- The total number of sectors = 1
- Irrigation time = 15 minute
4. Proceed to panel
S 38
(SET SECTORS) to verify these settings. If they are
different than those from above they have to be set.
5. Set the reference value for pH and the range for its allowable variation (any
sensor’s input value that exceeds this range will trigger an alarm) in panel
S40
(PH CONTROL).
6. Make sure that all the other programs are stopped. For each program (from 1
to 9) we are going to set in panel
S 32
(WORKDAY) as “
N
” (inactive) .
7. Verify if for program 10 in panel
S 08
(WORKDAY) the working time is valid
for the day when we are making the tuning (the current day). If not proceed to
set it in panel
S 32
(
WORKDAY
).
8. In panel
S 59
(
SET LOG LEVELS
) set the following options:
Recording level =
01
;
Consulting level = 01
. This means that the log is going to be consulted
for sensors’ value and the log registrations are going to be read by the sensors
(pH, respective EC).
With the above settings we are going to have the irrigation time set for a single
sector in panel
S 38
(
SET SECTORS
). The starting condition is manual starting -
in panel
S 47
(
PROG MAN START
).
Next we set the PID parameters for pH in panel
S 57
(SET PID PARAMS), as
follows:
pHk = 1.0
pHTi = 99.9
pHTd = 0.0
With the above setting we are going to have a Proportional regulation for pH.
9. From panel
S 47
(PROG MAN START) we start manually program 10. Wait
until the set time expires (15 minutes for default setting).
Summary of Contents for HI 8001
Page 12: ...12...
Page 68: ...68 9 ELECTRICAL DIAGRAMS...
Page 69: ...69...
Page 70: ...70...
Page 71: ...71 POWER BOARD EXTENSION BOARD MAIN BOARD...
Page 74: ...74 APPENDIX 3 GRAPHICAL EXPLANATION...
Page 75: ...75...
Page 76: ...76...
Page 85: ...85 APPENDIX 5 INSTALLATION BLOCK DIAGRAM...
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Page 88: ...88 w w w h a n n a i n s t c o m MAN8001 07 03...