Storage; Emergency Operation; Fault Nding - Hardi HC2500 Instruction Book

Storage

When the tractor and sprayer is parked, disconnect the power supply to the
Scanbox. This will stop the system from using power.
The display and control boxes should be protected from moisture and should
be removed if the tractor does not have a cabin.

Emergency operation

The system is added to a standard electric control unit without any modi -
cations to the wiring. Should there be a problem when using the HC 2500
disconnect it from the Spray control box.
Spraying can now be continued.

Fault nding

Fault
No start-up.
Blinking back-light.
No "bip" sound at start-up.
Displayed area larger
than actual area.
Displayed volume larger
than actual volume.
Fine tuning the ow constant - PPU
Calibration of the ow transducer is carried out with clean water but small
changes may occur when adding pesticides or fertiliser.
This will e ect the nal readings. This is typically noted when the volume
displayed on the display does not equal the actual known volume that was
sprayed out. The below formula can be used to
" ne tune" the ow transducer PPU.
Original PPU x Displayed Volume
New PPU =
For example, the spray tank is lled with 2400 litres of spray liquid. When
sprayed out, the display showed a total of 2300 litres.
(Original PPU = 120.0)
New PPU =
Cause
Check polarisation is correct.
Poor power supply.
Field was not rectangular.
"Tramlines" narrower than
spray width.
Pressure equalisation valve
leaks.
Sprayed Volume
120.0 (Original PPU) x 2300 (Displayed Volume) = 115.0
2400 (Sprayed Volume)
Remedy
Brown +
Blue -
Check battery, cabling and
connections.
Measure "tramline" width.
Replace seals.
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