Hanna Instruments HI 8050 - Manual (Page 53)

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and fertilizers. This panel displays and allows the setting of the following pa-
rameters:
− Max Lit Time
Max Lit Time Max Lit Time Max Lit Time Max Lit Time – the time needed for a motorized valve to open completely
from a full close position. It has to be the same for all motorized valves.
− Close pH If Idle Close pH If Idle Close pH If Idle Close pH If Idle Close pH If Idle – if set ‘Y’ the control valves for pH will be closed if the
control of pH is idle for a period of time.
− Close Fert If Idle Close Fert If Idle Close Fert If Idle Close Fert If Idle Close Fert If Idle – if set ‘Y’ the control valves for fertilizer will be closed
if the control of fertilizers is idle for a period of time.
NOTE: All motorised valves must be identical !
SET PID PARAMETERS – S60
Reduce EC sens by:01
Reduce pH sens by:01
Prop ctrl cycle: 100
SET PROP CTRL S60
This panel allows the setting of the control action for pH and EC. The follow-
ing parameters can be set:
− Sensivity factor for EC
Sensivity factor for EC Sensivity factor for EC Sensivity factor for EC Sensivity factor for EC - the active command time for the actuators is
divided by this factor
− Sensivity factor for pH - Sensivity factor for pH - Sensivity factor for pH - Sensivity factor for pH - Sensivity factor for pH - same as for EC
− Proportional control cycle - Proportional control cycle - Proportional control cycle - Proportional control cycle - Proportional control cycle - is the duration of a control cycle
NOTE: The proportional control is used only for the EC and pH control there-
fore only these two controllers use this control cycle. The volume and the
ratiometric control are using the same control cycle as the measurement cycle
that can be set though “Time cycle” in panel S61 (SET TIMINGS).
SET TIMINGS – S61
Start delay: 01s
Stop delay: 01s
Time cycle: 02.5s
SET TIMINGS S61
This panel displays and allows the setting of the following parameters:
− Start delay
Start delay Start delay Start delay Start delay - Selectable start delay value for the main pump as it relates to
the open command for the first active sector.
− Stop delay Stop delay Stop delay Stop delay Stop delay - Selectable stop delay value for the main pump as it relates to
the close command for the last active sector.
− Time cycle - Time cycle - Time cycle - Time cycle - Time cycle - The complete cycle duration factor of the Fertigation Control-
ler for measurement, volumetric and ratiometric control. For EC and pH