Hanna Instruments HI 8000 User Manual

Instruction Manual

HI 8001 & HI 8002

Panel-mounted and Wall-mounted

Fertigation Controllers

Manufacturers since 1978

These Instruments are in

Compliance with the CE Directives

Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction

manual carefully before using the instrument. This manual will provide you with the necessary information for a correct use

of the instrument, as well as a precise idea of its versatility. If you need more technical information, do not hesitate to e-mail us at

tech@hannainst.com. These instruments are in compliance with directives.

TABLE OF CONTENTS

1 THEORY OF FUNCTION ...................................................................4

2 GENERAL DESCRIPTION ...................................................................5

3 FUNCTIONAL DESCRIPTION ........................................................ 6

3.1 Irrigation Control .................................................................... 6

3.2 Conductivity Control ............................................................... 9

3.3 Fertilization Control ................................................................ 10

3.4 pH Control ............................................................................ 10

3.5 PID Control ........................................................................... 11

3.6 Agitator Control ..................................................................... 14

3.7 Filter Control ......................................................................... 14

3.8 Manual Functions ................................................................. 14

3.9 Alarms .................................................................................. 15

3.10 Logging (Diary) Functions ...................................................... 16

3.11 Date and time controller settings ............................................ 16

3.12 Password setup ..................................................................... 16

4 USER INTERFACE ........................................................................ 17

4.1 Operating Modes ................................................................... 17

4.2 Panels Browsing Methods ....................................................... 20

4.3 Panel List .............................................................................. 20

5 PANEL DESCRIPTION ................................................................... 22

5.1 General consulting panel code ............................................... 22

5.2 Consulting Program Settings .................................................... 24

5.3 Statistics Consulting ............................................................... 34

5.4 Alarms Consulting ................................................................ 37

5.5 Log Consulting ...................................................................... 37

5.6 General Settings .................................................................... 39

5.7 Program Settings .................................................................... 40

5.8 Manual Commands .............................................................. 49

5.9 Customized Settings ................................................................ 50

6 CALIBRATION PROCEDURES ........................................................ 57

6.1 Sensor Calibration Procedure .................................................. 57

6.2 PID Calibration Procedure ...................................................... 58

7 ALARMS DESCRIPTION ................................................................ 64

8 TROUBLE SHOOTING GUIDE ...................................................... 66

9 ELECTRICAL DIAGRAM .............................................................. 68

APPENDIX 1: KEYBOARD OPERATING MODES ................................. 72

APPENDIX 2: OUTLET ASSIGNMENT TABLE ...................................... 73

APPENDIX 3: GRAPHICAL REPRESENTATION .................................... 74

APPENDIX 4: LIST OF PANELS ......................................................... 77

APPENDIX 5: INSTALLATION BLOCK DIAGRAM ................................. 85

WARRANTY ................................................................................... 87

1 THEORY OF FUNCTION

Irrigation is one of the most important operation in agriculture. With proper irrigation the quality and quantity of crops can be significantly enhanced. Correct irrigation is not a simple process: the quantity of water must be sufficient for crops, and if not, photosynthesis and overall growth is impeded. However, if the amount of water is more than required, plant growth may become excessive producing a taller, softer and/or damaged product.

The Fertigation Controller can control the quantity of irrigation water based on time or volume. Different sectors can be irrigated at different times during a day with different water quantities.

In the Fertigation Controller each irrigation program provides control of pH and conductivity. When necessary, a specific program performs a pH correction by the introduction of an acid or base into the irrigation water. pH control is based on multiple sensor input and a specified set point, while conductivity control is directly related to the level of fertilization.

When the Fertigation Controller commands the addition of 1 to multiple fertilizers to the irrigation stream, conductivity sensors continually monitor the conductivity of the stream and the overall amount of fertilization is maintained based on a specified set point (limit). The Fertigation Controller can command the addition of multiple (1 to 4) fertilizers to irrigation water. The percentage of each fertilizer is set by the user and controlled by a specific program based on the conductivity set point.

If a pH or conductivity control problem arises, the program generates an alarm to inform the user. All operations of both control processes are stored in memory.

The Fertigation Controller performs all necessary operations in the monitoring and control of irrigation and fertilization processes. These operations are conducted continuously throughout the day, month and year. To use and manage the system properly, all the necessary control values must be set (Setup mode). During monitoring operations (Consulting mode) the user can obtain information about how the system and irrigation process are functioning, in addition to the history of all operations for current and previous days. To view the required information on the display or set a specific parameter, the appropriate display panel has to be selected, as explained in this manual.

2 GENERAL DESCRIPTION

The Fertigation Controller is a micro-processor-based system used in fertilization and irrigation control for greenhouses or open fields with powerful, flexible programming features.

The main function of the Fertigation Controller is supplying and controlling the necessary water and fertilizers for crops according to several parameters such as acidity, conductivity and received solar radiation.

The user interface is structured in two parts:

1. Consulting (numbered panels indicated by Cxx)

2. Setting (numbered panels indicated by Sxx).

This instruction manual will present the interface in 2 forms:

1. Fertigation Controller functions

2. Panel order

Fertigation Controller is capable of executing the following functions:

- Irrigation control by time or by volume

- pH control

- Conductivity control

- Fertilization control

- Irrigation adjustment due to solar radiation

- Manual correction

- Agitator control

- Filter control

- Water supply control

- Main pump control

- Sector control

- Serial communication

- Alarm function

- Logging function

3 FUNCTION DESCRIPTION

In this chapter the main functions of the Fertigation Controller are presented. For a better understanding see the typical installation schemes utilized for irrigation and fertilization presented in the Installation Block Diagram, Appendix 5.

3.1 IRRIGATION CONTROL

The Fertigation Controller can control 8 to 32 sectors (one valve per sector) for each of the ten irrigation programs:

- 1 to 32 valves (sectors) can be selected specifying the sector’s number and the desired value of irrigation time or volume for a specified irrigation program-using Panel S 38 (SET SECTORS). The panel displays the num- ber of set sectors for the respective irrigation program

- The current status, set value plus irrigation extension and “Done” time/ volume value for the selected irrigation program/sector are shown on Panel C 14 (SECTOR STATE).

Irrigation can be controlled by time or volume – irrigation control mode can be switched between time and volume using panel S 53 (IRRIG CTRL MODE).

Each irrigation program can be started by:

TIME:

- 1 to 6 different timetables (values) per program can be set using panel S 35 (SET START TIME). “Start cond” must be the selected option on panel S 34 (START CONDITION).

ACCUMULATED SOLAR RADIATION:

- A Solar Radiation set point can be established for starting each program

- The accumulated solar radiation level can be used as a starting condition for each program

- There are 3 parameters used to start a program by solar radiation:

- The solar radiation sensor threshold value can be established for each irrigation program. When the solar radiation measured value exceeds the sensor threshold value the accumulated solar radiation value is increased. This parameter can be modified on panel S 43 (Level: xxxxW/m2).

- The accumulated solar radiation value is used to keep track of the measured solar radiation level during the time interval determined by the previous start moment of the irrigation program and the actual moment. This parameter can be seen on panel S 06 (Irrig = xxxxWh/m2).

- The accumulated solar radiation starting level value is used as a threshold value for the accumulated solar radiation. When the accumulated solar radiation value exceeds this threshold level the irrigation program is started (or it is brought in READY state if there are other programs currently running at that moment). This parameter can be modified on panel S 43 (Acc = xxxx Wh/m2) and can be seen also on panel C 06 (Acc = xxxxWh/m2)

EXTERNAL TANK LEVEL:

- One external tank (level indication) can be assigned to each irrigation program, that can start the specified irrigation program – this option is set using panel S 34 (START CONDITION).

MANUAL ACTIVATION:

- A program can be started using panel S 47 (PROG MAN START)

- A program can be stopped using panel S 48 (PROG MAN STOP)

Each irrigation program can be repeated a specified number of times. The number of repetitions as well as pause time between two repetitions can be specified using panel S 36 (PROGRAM REPEATS).

Each irrigation program can be given a priority in relation to others (5 priority levels). Priorities and maximum open sectors per group can be specified for each program and can be set using panel S 33 (SET PRIORITY).

Below we present the setting requirements for each irrigation program:

THE WORKING PERIOD :

- (between start date (day/month) and end date (day/month)) – use panel S 31 (ACTIVE TIMETABLE). For more details see Appendix 3.

THE WORKING TIME DURING A DAY:

- (between start time and end time) – use panel S 31 (ACTIVE TIMETABLE).

For more details see Appendix 3.

THE CYCLE WORK/ REST DAY:

- can be set using panel S 32 (WORKDAY).

For more details see Appendix 3.

THE WORKING DAYS IN A WEEK:

- use panel S 32 (WORKDAY). For more details see Appendix 3.

Working time status for each irrigation program, if selected (irrigation program is in work period of year, day and week) is displayed in panel C 08 (WORK TIME COND).

The percent of irrigation time or set volume can be automatically modified by the following factors:

SOLAR RADIATION FACTOR:

- This option can be set using panel S 42 (CORRECTIONS). This factor affects the irrigation time or volume extension in accordance with the set value of the solar radiation sensor level and solar radiation accumulation. The solar radiation accumulation extension setting and current value is displayed on panel C 06 (SOLAR RAD IRRIG). Solar radiation extension correction can be viewed using panel C 11 (SOL RAD EXTENT).

MANUAL FACTOR:

- This option can be set using panel S 42 (CORRECTIONS). Percentage and corresponding value of time or volume can be viewed using panel C 12 (MAN FACTOR).

Total correction percentage, time or volume value is displayed on panel C 13 (TOTAL CORRECTION).

PRE/POST IRRIGATION: In each irrigation program the pre-irrigation and post-irrigation time or volume

value (used to clean the irrigation pipes with pre-irrigation water) can be set using panel S 37 (PRE/POST IRRIG).

Panel C 01 (GENERAL INFO) displays the active irrigation program and active sectors.

The active irrigation program is displayed on panel C 02 (SENSORS STATE). Related data regarding the active irrigation program (active irrigation program

number, last start condition and current / set repetition number) are displayed on panel C 03 (PROGRAM STATE).

Information about selected irrigation program, priority and irrigation program conflict are displayed on panel C 09 (PRIOR & CONFLICTS). Set value data, correction value and irrigation completion (“Done”) value are displayed on panel C 10 (IRRIG STATE).

Information about the last start condition, date and time are displayed on panel C 18 (PROG LAST START).

Total accumulation value from a previous date is displayed on panel C 19 (TOTAL ACCUMUL).

Accumulation value from previous date and activation number for a selected irrigation program are displayed on panel C 20 (PROGRAM ACCUMUL).

Accumulation value from previous date, for a selected sector, is displayed on panel C 21 (SECTOR ACCUMUL). In addition, this panel displays the valve number assigned with the corresponding sector.

- Accumulations erase mode can be chosen on panel S 61 (ERASE STATISTICS). The accumulation erase can be performed for all programs and

sectors using one of the following ways:

- Manually

- Every day at specified hour

- Automatically when the accumulations counter value overflows

3.2 CONDUCTIVITY CONTROL

Conductivity control is used to control the fertilization and a reading can be obtained with one to three conductivity sensors, one to two for fertilization control and one for water supply conductivity control.

When using two conductivity sensors, the second for safety, the maximal admissible difference between these two sensors can be set using panel S 55 (SENSORS CONFIG).

A third conductivity sensor can be used to measure the conductivity of the water supply.

Conductivity sensor (S1 main, S2 second and S-for water input) status and conductivity reference are displayed on panel C 05 (EC STATE). In addition, the main conductivity sensor value is displayed on panels C 01 (GENERAL INFO) and C 02 (SENSORS STATE);

Solar radiation accumulation setting and current value for conductivity reference correction is displayed on panel C 07 (SOLAR RAD FERT).

The conductivity control is made in accordance with a preset conductivity reference value, specific for each irrigation program. In addition, the conductivity reference has a minimum offset and maximum offset. The reference value, minimum and maximum offset can be set using panel S 41 (COND CONTROL).

When the conductivity is not within the specified range for a period of time (more than the time specified) or the difference between the 2 primary conductivity sensors is greater than the specified difference, the conductivity control will generate a conductivity alarm . Specified difference can be set using panel S 55 (SENSORS CONFIG). The conductivity alarm threshold can be set using panel S 41 (COND CONTROL). “EC Out of Range”-the conductivity alarm can also be generated when the EC IN sensor’s value exceeds the specified EC sensor difference.

Given a conductivity alarm condition, conductivity control can be maintained if “Ctrl on EC alarm” is selected using panel number S 52 (ALARM BEHAVIOR).

Statistical values of total conductivity are displayed on panel C 22 (TOTAL AVERAGES). For each irrigation program’s conductivity average see panel C 23 (PROGRAM AVERAGES) and for each individual sector’s conductivity average see panel C 24 (SECTOR AVERAGES).

3.3 FERTILIZATION CONTROL

Fertigation Controller can use up to 4 fertilizer tanks. Each irrigation program can specify the percentage for each type of fertilizer.

These values can be set using panel S 39 (SET FERTILIZERS). The fertilization is done in accordance with the conductivity control. Each irriga-

tion program has a specified conductivity target value (conductivity reference value which is set using panel S 41 (COND CONTROL);

The percent of applied fertilization can be automatically modified with respect to an amount of solar energy accumulated since the previous application. The current fertilizer status (set and current percentage value) can be checked on panel C 16 (FERTILIZ STATE).

3.4 pH CONTROL

The pH control is necessary to correct and maintain the pH of irrigation water within specified values (min and max offset values). Minimum and maximum offset values are set using panel S 40 (pH CONTROL). To choose between acid or alkaline correction you must go to panel C 51 (pH CTRL OPTIONS). In this panel you can also select pH correction in pre/post irrigation.

The pH correction is made in accordance with a selected pH reference value specific for each irrigation program. This value can be set using panel S 40 (pH CONTROL).

pH control is made with two pH sensors for additional safety and accuracy. Current status of sensors (main and secondary) in addition to the reference value is displayed on panel C 04 (pH STATE).

Main pH sensor value is displayed on panel C 01 (GENERAL INFO) and C 02 (SENSORS STATE)

When the pH is not within the specified range for a period of time (more than the time specified) or the difference between the 2 pH sensors (main and secondary) is greater than the specified difference the pH control will generate a pH alarm. The specified difference can be set using panel S 55 (SENSORS CONFIG). The pH alarm threshold can be set using panel S 40 (PH CONTROL).

Given a pH alarm condition, the pH control can be maintained if “Ctrl on PH alarm” is selected using panel number S 52 (ALARM BEHAVIOR).

Given a pH alarm condition, the irrigation can be maintained if “Irrig on PH alarm” is selected using panel number S 52 (ALARM BEHAVIOR).

Statistical values of pH are displayed on panel C 22 (TOTAL AVERAGES). For each irrigation program’s pH average see panel C 23 (PROGRAM AVER-

AGES). For each individual sector’s pH average see panel C 24 (SECTOR AVERAGES). All pH averages can be deleted manually or at specified time of day using panel S 61 (ERASE STATISTICS).

3.5 PID CONTROL

A simplified schematic of the control (pH and EC):

EC and pH control is performed using an automatic regulated system with PID controller (Proportional, Integral and Derivative). The role of this controller is to maintain a set pH and EC value within a mixing tank prior and during distribution (see diagram). The control of pH and EC is made separately.

The components are as follows:

- The mixing tank where the influent and additives are combined

- The neutral (additive) solution tank containing an acid, base or fertilizer

- The valve for introducing the additive solution into the mixing tank con-

trolled by the PID controller

- PID Controller

- The input (influent) water source

- The pump for pumping water from the tank to the irrigation sectors

The Fertigation Controller automatically provides a command output signal to a control element such as a pump or valve based on a sensor input signal. The function of the Fertigation Controller is to proportionally control the pH and EC of the process at a specified set point. The above output signal commands the

opening and closing of a valve through which a neutral solution is circulated. The amount of neutral solution added is relative to the opening of the valve, which is directly proportional to the magnitude of difference between the mixing tank pH and the set point.

Control of pH implies a complex adjustment. The relation between the added reagent and the process pH is logarithmic. There is the possibility to introduce large errors in the process due to over dosing or under dosing reagent creating an oscillation effect. PID control can be used to reduce the possibility of overshoot and large oscillations in the process by creating control output proportional to the magnitude of deviation from the set point (P), time integral of error (I), and rate of change of the measurement (D). Proportional, Integral, and Derivative (PID) control can be used individually (typically Proportional control only) or in combination such as PI, PD or PID. How these control actions are used depends upon the requirements of the process.

Set point (reference value) is the desired value of the measurement. The error is defined as the difference between the set point and measurement:

Error = Setpoint – Measurement

The descriptions and definitions of the individual control actions are as follows:

PROPORTIONAL ACTION (P):

The simplest continuous control mode is proportional control, so called because the controller output is proportional to the magnitude of error. However, the proportional control is subject to one major limitation, steady state offset (steady deviation from the set point). Increasing the sensitivity of the controller (controller gain) can reduce the steady state offset but only with slow processes. For this reason the proportional control by itself it is used primarily for slow, consistent processes that can tolerate high controller gain, which minimizes the steady state offset. Consequently, high gain control action can throw the process into oscillation if the process variable becomes unstable and begins to change rapidly.

INTEGRAL ACTION (I):

To eliminate offset droop and tighten the control of the process, the integral action is introduced in conjunction with proportional control (PI). Integral control produces control action proportional to the time integral of the error. As long as the error exists (steady deviation from the set point), the integral term will continue to increase, adding more control action, driving the error toward zero.

DERIVATIVE ACTION (D):

With derivative action, the controller output is proportional to the rate of change of the measurement and is primarily used to avoid overshoots. Derivative action

can compensate for changes in the process variable (measurement) and is particularly good for slowly moving processes. When a change occurs in the process the derivative action causes the controller gain to move the “wrong” way until the measurement gets near the set point.

3.6 AGITATOR CONTROL

Each of the 4 fertilizer tanks may have an agitator. An agitator can be activated in a specific tank prior to tank selection by an

irrigation program. The pre-agitation time can be set using panel S 45 (SET AGITATORS); the pre-agitation occurs only when the pre-irrigation time is set.

During the irrigation program, the agitators can be stopped (if working time is zero), set to work continuously (if pause time is zero) and intermittently (if working time and pause is different than zero).

The work and pause time can be set using panel S 45 (SET AGITATORS). The agitator settings are displayed on panel C 17 (AGITATOR STATE).

3.7 FILTER CONTROL

Fertigation Controller has the capability to check and automatically clean two filters controlled by two filter-cleaning programs.

Each filter cleaning program can be started by the following conditions:

- Following one specified irrigation program. This irrigation program can

be set in panel S 46 (FILTERS CTRL).

- When a “dirty filter” alarm is activated. Cleaning by this option is set using

panel S 46 (FILTERS CTRL).

- The working time for filter-cleaning programs can be set using panel S 46

(FILTERS CTRL).

3.8 MANUAL FUNCTIONS

The Fertigation Controller has the following Manual function capabilities:

- To switch the controller state between STOP, WORK and INIT, use panel S

49 (CONTROLLER STATE).

- The controller state can be checked using panel C 01 (GENERAL INFO).

- To manually start a program use panel S 47 (PROG MAN START).

- To manually stop a program use panel S 48 (PROG MAN STOP).

- To check and to change the value for each of the outputs, use panel S 50

(OUTLET MAN CTRL).

- To erase all statistics, use panel S 61 (ERASE STATISTICS). Statistics indicates pH and conductivity averages for all irrigation programs and sectors in addition to average total irrigation accumulation.

- To erase the settings of one irrigation program or to erase all settings for all irrigation programs, use panel S 62 (ERASE SETTINGS).

3.9 ALARMS

The Fertigation Controller has the capability to supervise and generate an alarm for the following conditions:

- Conductivity sensor out of range. Reference, minimal and maximal offset and threshold for conductivity alarm are set using panel S 41 (COND CONTROL). The current values of conductivity sensors are displayed on panel C 05 (EC STATE)

- A difference greater than the set value between the first and second conductivity sensors; Maximum value of difference is set using panel S 55 (SENSORS CONFIG)

- pH sensor out of range. The reference, minimum and maximum offset and threshold for pH alarm are set using panel S 40 (PH CONTROL). The current values of pH sensors are displayed on panel C 04 (pH STATE)

- A difference greater than the set value between pH sensors; the maximum difference value is set using panel S 55 (SENSORS CONFIG)

- Problems with the water supply

- Dirty filters

When the level is low in the fertilizer and acid tanks the system will take appropriate action and record the alarm. These actions can be:

- in case of a pH alarm condition, the irrigation process can be suspended or continued depending on the choice set within panel S 52 (ALARM BEHAVIOR) depending on the choice set within.

- in case of an EC alarm condition, the irrigation process can be suspended or continued depending on the choice set within panel S 52 (ALARM BEHAVIOR) depending on the choice set within.

- in case of a dirty filter alarm condition, start the filter cleaning program in accordance with the priority and working time settings

- in case of a water supply alarm situation, the Controller will stop every irrigation process until the alarm is shot off.

All alarm situations are displayed on panel C 25 (ALARM). All anomalies (old alarm conditions) are displayed on panel C 27 (ANOMALY).

3.10 LOGGING FUNCTIONS

The Fertigation Controller has the capability to log the most important occurred events and values of different parameters that can offer a description of the evolution of the entire process;

The most important values are:

- Number and time period of every program activation;

- Filter cleaning;

- Averages of pH and conductivity;

- Accumulations;

- Modifications to preset fertilization values (e.g. manual, solar radiation);

- Alarms;

The logging level for recording and consulting can be set using panel S 59 (SET LOG LEVELS).

The date of desired logging records can be set using panel C 26 (VIEW LOG DATE).

The logging records are displayed on panel C 28 (LOG). The selectable log recording/consulting levels range from 1 to 3. They are as-

signed as it follows:

Level 1: - records the sensors deviations events Level 2: - records statistics (pH and EC averages, accumulations) Level 3: - records programs and controller status events.

3.11 DATE AND TIME CONTROLLER SETTINGS

The controller date and time can be checked on panel C 01 (GENERAL INFO) and can be set using panel S 30 (SET DATE & TIME).

3.12 PASSWORD SETUP

The access to Fertigation Controller can be protected by a password. This password can be set using panel S 60 (SET PASSWORD), also this password can be disabled using the same panel.

4 USER INTERFACE

The Fertigation Controller’s user interface consists of a 4 x 20 character LCD and a 23-key keyboard.

Keyboard structure.

4.1 OPERATING MODES

The Fertigation Controller operates primarily in two major modes: Consulting Mode Setting Mode User interface panels (screens) are broken down into two categories:

1. CONSULTING PANELS

2. SETTING PANELS

Both modes of operation are readily available to the user.

1. CONSULTING MODE

The consulting mode allows the user to view the current state and set the conditions of the Fertigation Controller. The setting panels are in consulting mode until the SET key is pressed. The primary consulting screens are designated from C 01 through C 29. The following outline highlights the functions of the consulting mode.

- 2 browsing methods are enabled. See Section 4.2 “PANEL BROWSING METHODS”.

- UP and DOWN ARROWS KEYS can be used to switch the panel index (where available) allowing user to view the same kind of data assigned to

different controller entities (programs, sectors, fertilizers etc.) within the same panel.

- LEFT and RIGHT ARROWS KEYS can be used to move the cursor within the selected parameter’s limits.

- ESC key can be used as a shortcut key to access the C 03 (PROGRAM STATE) panel from any currently viewed panel.

- HOME key can be used as a shortcut key to access the C 01 (GENERAL INFO) panel from any currently viewed panel.

- END key can be used as a shortcut key to access the S 48 (PROG MAN STOP) panel from any currently viewed panel.

- TAB key can be used to switch the focus between the panel number object and the panels index parameter if the current panel is indexed. If there is no index parameter present on the current panel, the TAB key has no effect. Panels are typically indexed by the program number. For example, panel C 03 (PROGRAM STATE) displays the current state for each program. Once panel C 03 is selected and the TAB key pressed, the focus (cursor) is shifted from the panel number to the program number “Prog 01”. The ARROW KEYS can now be used to scroll through each program state consecutively without leaving the panel.

- ENTER key is used to confirm any new values entered in any of the selected panels. This is only possible if data items on a panel (screen) are selectable.

2. SETTING MODE

The setting mode allows configuration of all the adjustable parameters of the Fertigation Controller. The setting screens are designated from S 30 to S 62. These panels can be viewed by one of 2 browsing methods. Selecting the appropriate screen and pressing the SET key initiates the setting mode. Once the setting mode is entered both panel-browsing methods are disabled and navigation is allowed only within the currently selected panel. The following outline highlights the functions of the Setting Mode.

- Both panel (screen) browsing methods are disabled. See Section 4.2 “PANEL BROWSING METHODS”.

- Focus (cursor location) is automatically shifted to the first editable data object on the selected panel.

- UP, DOWN arrow keys allow navigation between all editable data objects within the current panel.

- LEFT, RIGHT arrow keys allow navigation within the currently focused data object. If the cursor exceeds the boundaries of the data object then the focus is transferred to the previous or next editable item within the current panel.

- TAB key can be used to move only in a forward direction, from one data object to the next within the selected panel.

- ENTER key confirms all the data entered in a current panel. Once the ENTER key is pressed and data confirmed, the controller reverts to consult-

ing mode. The SET key must be pressed to reenter the setting mode.

- ESC key cancels new data entered in the currently focused data object and exits the setting mode. The change of data is not saved in the current object and the previous setting is maintained.

4.2 PANEL BROWSING METHODS

In consulting mode, two browsing methods are available to view each of the 62 panels (screens) of the Fertigation Controller.

- Step-by-step browsing: pressing the PAGE UP and PAGE DOWN keys allow consecutive navigation from one panel to the next. The direction is dependent upon which key is selected.

- Direct access browsing: the number of the desired panel can be entered directly using the panel number located on the bottom right corner of every panel, prefixed by a C or S. The panel number object is the initially focused object on each screen. After entering the value by using the keypad and

ARROW KEYS, press the ENTER key to view the selected panel.

NOTE: If a panel is selected and the SET key is pressed entering the setting

mode, both browsing methods are disabled.

4.3 PANEL LIST

PANEL TABLE

CONSULTING PANELS SETTING PANELS

01 GENERAL INFO 30 SET DATE & TIME

02 SENSORS STATE 31 ACTIVE TIMETABLE

03 PROGRAM STATE 32 WORKDAY

04 PH STATE 33 SET PRIORITY

05 EC STATE 34 START CONDITION

06 SOLAR RAD IRRIG 35 SET START TIME

07 - 36 PROGRAM REPEATS

08 WORK TIME COND 37 PRE / POST IRRIG

09 PRIOR & CONFL ICTS 38 SET SE CTORS

10 IRRIG STATE 39 SET FERTILIZERS

11 SOL RAD EXTENS 40 PH CONTROL

12 MAN CORRECTION 41 COND CONTROL

13 TOTAL CORRECTION 42 CORRECTIONS

14 SECTOR STATE 43 SOLAR RAD IRRIG

15 - 44 -

16 FERTILIZ STATE 45 SET AGITATORS

17 AGITATOR STATE 46 FIL TERS CTRL

18 PROG LAST START 47 PROG MAN START

19 TOTAL ACCUMUL 48 PROG MAN STOP

20 PROGRAM ACCUMUL 49 CONTROLLER STATE

21 S ECTOR A CCUMUL 50 OUTL ET MAN CTRL

22 TOTAL AVERAGES 51 PH CTRL OPTIONS

23 PROGRAM AVERAGES 52 ALARM BEHAVIOR

24 SECTOR AVERAGES 53 IRRIG CTRL MODE

25 ALARM 54 CALIBRATE SENSOR

26 VIEW LOG DATE 55 SENSORS CONFIG

NOTE: Data that has been changed in an editable data object is saved once

focus has been removed from that object by pressing the ARROW KEYS or TAB .

5 PANEL DESCRIPTION

5.1 GENERAL CONSULTING

The following panels C 01 through C 29 are for the general consulting of controller settings and current measurements. The data objects within each panel are described from left to right unless otherwise specified.

5.1.1 INITIALIZATION PANEL

HANNA INSTRUMENTS F1 CONTROLLER V0.90 INITIALIZATION Loading String Table

This panel is shown during the Fertigation Controller Initialization state; it contains the HANNA INSTRUMENTS logo, the name of the controller and the software version. The last line is used to display the current status of the initialization sequence. This panel is also used to display any possible errors that may occur during the start up sequence.

5.1.2 START PANEL

HANNA INSTRUMENTS F1 CONTROLLER Fri 15-03-2000 13:15

STOP Press ENTER

5.1.3 INPUT PASSWORD PANEL

Enter password

****

This panel is displayed during the password authentication sequence. If this sequence fails, the user will be logged out and the START panel will be displayed. If the password is correct panel C 01 (GENERAL INFO) is displayed. The default password is 0000. See section 6.9.10 (Setting Password, S 60) for instructions on setting this feature.

Although access to the controllers features are denied, the functionality of the controller is not directly effected if a password authentication sequence fails.

5.1.4 GENERAL INFO – C 01

WORK Anomalies 00 Prog 08 06.4pH Sect 07 02.1mS 13:15

GENERAL INFO C01

This panel displays the following information starting from top left:

Fertigation Controller Functional State (top left corner)

When the controller is running it can be in one of the following states: INITIALIZATION, STOP, WORK, BLOCK. When the Fertigation Controller is first powered on the first state is INITIALIZATION. In this state the unit performs internal tests. In STOP state all programs are suspended. Under normal conditions the functional state is WORK. In the WORK state all irrigation and fertilization programs are executed. If an alarm occurs the Fertigation Controller enters the BLOCK state until the alarm condition is corrected. The user can customize the alarm management system behavior using setting panels S 40, S 41 (pH and EC CONTROL) and panel S 52 (ALARM BEHAVIOR).

Anomalies (top right corner)

The anomalies counter represents the number of alarms triggered since the last reset of the counter. This counter can be customized and cleared along with all system statistics via setting panel S 61 (ERASE STATISTICS).

Program Number

Reflects the selected program (can be selected only inside panel C 03). If no program is active a number is not visible.

pH sensor reading

Current (main) pH sensor reading.

Sector Numbers

All sectors assigned to the active program are displayed (cyclically) but only when an active program is running. If a program is not active the number is not visible.

EC sensor reading

Current (main) EC sensor reading.

System clock

If an alarm condition is present the time indication will also flash “ALARM” to alert the user.

NOTE:

- If the user is logged in and the operational mode is CONSULTING MODE, this panel can be accessed anytime and from any panel using the HOME key as a shortcut.

- The Real Time Clock, pH and EC sensors are always visible regardless of state.

- Whenever the Fertigation Controller is connected to a PC that runs the specific application of the fertigation controller on PC in “ON LINE” mode, this panel displays the label “PCCom” above the controller clock position. In this case the Fertigation Controller’s keyboard is disabled until the connection is lost due to different reasons.

5.1.5 SENSORS STATE – C 02

Active Program: 04

06.3pH 1200W/m2

06.4mS 13:15 SENSORS STATE C02

This panel provides an overview of the real time values of the system’s main sensors. This panel contains the following information:

Active program number

Displays the number of the executing program. If no program is running a number is not displayed.

pH sensor reading Solar Radiation sensor reading EC sensor reading System clock

5.2 CONSULTING PROGRAM SETTINGS

The following panels allow viewing the program setting of the Fertigation Controller. The program number can be changed only in C 03 with the UP and DOWN keys. In addition, the TAB key can be used only in C 03 to toggle the cursor (focus) between the panel number and the program number. The desired program number can then be entered directly by using the keypad.

5.2.1 PROGRAM STATE – C 03

PROG 08 ACTIVE Started by Solar Rad Repeat 02/05 13:15 PROGRAM STATE C03

The purpose of this panel is to allow the user to inspect the status and settings of a particular program. The program number indexes this panel. This panel contains the following information:

Program Number

Reflects the selected program (can be selected only inside panel C 03). See Section 5.2.

Program State

During the lifetime of a program it cycles through several states. Each program is initially in NO SET state which means no settings have been applied to the program by the user. Once the settings have been applied the program is considered in SET state. Once a specific condition such as start time is met the program passes to READY state to await execution. Once the program reaches the highest priority and the start time is met, the program passes to ACTIVE state and executes. The program may be suspended and placed in WAIT state due to a higher priority program moving to ACTIVE state or a specific alarm condition triggering. When a program completes execution it is placed in FINISHED state. The cycle may be repeated and the program returned to ready state if the program repeats were specified after a set delay period.

Program Started by

Displays how the last program start was triggered. Programs can be started by a met time condition, solar radiation level, manual start, low level in external tank, or directly after the completion of another program. If the program is in NO SET (no settings applied to program) or in SET (settings applied but conditions not met) state, “Started by” is blank.

Repeat

Displays the current repetition followed by (/) the maximum number of the programmed repetitions.

System clock

REMINDER: In CONSULTING MODE the ESC key can be used as a short-

cut key to access this panel from any panel.

5.2.2 PH STATE – C 04

Prog 08 Ref=06.4pH S1=05.4PH S2=05.5PH 13:15 PH STATE C04

The purpose of this panel is to allow the user to inspect the current pH reference point for a specific program and the real time pH sensor readings. The program number indexes this panel. This panel contains the following information:

Program Number

Reflects the selected program (can be selected only inside panel C 03). See Section 5.2.

Ref = Reference or set point pH value for the specified program. S1 = Real time value of pH sensor 1. This reading applies to the entire process

and is not program specific. S2 = Real time value of pH sensor 2. This reading applies to the entire process

and is not program specific.

System clock

5.2.3 EC STATE – C 05

Prog 08 Ref=02.0mS S1=02.0mS SIn=03.2mS S2=02.1mS 13:15 EC STATE C05

The purpose of this panel is to allow the user to inspect the current EC reference point for a specific program and the real time EC sensor readings. The program number indexes this panel. This panel contains the following information:

Program Number

Reflects the selected program (can be selected only inside panel C 03).

See Section 5.2.

Ref = Reference or set point EC value for the specified program. S1 = Real time value of EC sensor 1. This reading applies to the entire process

and is not program specific. S2 = Real time value of EC sensor 2. This reading applies to the entire process

and is not program specific. S in = Real time value of EC input sensor. This is an option sensor input to

measure the conductivity of the incoming water supply. This reading applies to the entire process and is not program specific.

System clock

5.2.4 SOLAR RAD IRRIG – C 06

Prog 08 Irrig=0720Wh/m2 Acc=0720Wh/m2 13:15 SOLAR RAD IRRIG C06

This panel displays the solar radiation irrigation settings. Due to the effects of solar radiation it may be necessary to augment (correct) the irrigation process accordingly. The program number indexes this panel. This panel contains the following information:

Program Number

Reflects the selected program (can be selected only inside panel C 03). See Section 5.2.

Irrig = The set level of accumulated solar radiation used for irrigation correction. This is a set point. Radiation beyond this limit will trigger a correction to the irrigation process.

Acc = Real time value of accumulated solar radiation. System clock

5.2.5 WORK TIME COND – C 08

Prog 08 Time Y Day Y Period Y 13:15 WORK TIME COND C08

The program number indexes this panel. This panel contains the following information:

Program Number

Reflects the selected program (can be selected only inside panel C 03). See Section 5.2.

Time

Indicates if the selected program is set to run on a time schedule.

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