Hanna Instruments HI 8000 Series - Manual (Page 67)

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occurred that may not be correctable by the type and amount of acid (or base)
being used. If the problem persists after checking the process pH and acid or
base supply, check panel S57 (SET PID PARAMETERS) to insure that the control
algorithms are correct.
EC sensor out of range
This indicates that the controller cannot adjust the EC value of the process within
the specified range. Check panel S41 (COND CONTROL) and S39 (SET FER-
TILIZERS) to insure the settings are correct. Also you should check the 4 EC tanks
and supply lines for proper level and function. Check the EC level of the incom-
ing water to determine if a change has occurred that may not be correctable by
the type and amount of fertilizers being used. If the problem persists after check-
ing the process EC and fertilizer supplies, check panel S57 (SET PID PARAM-
ETERS) to insure that the control algorithms are correct.
Program not set correctly
The minimum conditions that have to be set in order to have the program work-
ing are:
- At least one sector has to be set (the irrigation value is different from zero)
- Priority set between 1 and 5
- Sector / group set between 1 and 8
- At least one Start condition has to be selected
- All the time constrains have to be met (see panels S 31 and S 32)
Incorrectly displayed sensor values
Recalibrate sensors.
Output valve does not work
Check sector fuses. If the alarm output does not work when the correspondent
led is on, check the fuse to the right of the alarm connector. If the rapid valves
that control the pH, conductivity and filters do not function when the correspon-
dent led is on, check the fuse to the right of the fast valve connector. If the basic
valves outputs (valve 1 through 8) do not work when the correspondent led is on
check the fuse to the right of the basic valve connector.