Hanna Instruments HI 8001, Instruction Manual

Page: 7 / 88

7
- 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 run-
ning at that moment). This parameter can be modified on panel
S 43 (Acc
= xxxx Wh/m 2 ) and can be seen also on panel C 06 (Acc = xxxxWh/m 2 )
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 num-
ber 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).
T he percent of irrigation time or set volume can be automatically modified by the
following factors: