Hardi Navigator Operator's Manual page 9

EVC 3 / EVC 4 Operating Units Setup
The EVC has distribution valves with a constant pressure
equalisation system, allowing sectional control of the
sprayer without changing pressure. It gives a constant
application rate within the same gear when the number
of PTO revolutions are between 300 - 600 rpm (540
pump), or 650-1100 (1000 pump). A pressure gauge is
also fitted. The operating unit is fully electrically control-
led via a remote control box or the HARDI Controller.
Control boxes and power supply
Power requirement is 12V DC.
Note Polarity!
Brown Wire is pos. (+), Blue neg. (-).
Controls Setup Procedure
Before spraying, the EVC operating unit is adjusted
using clean water (ie without chemicals).
1 Choose the correct nozzle for the spray job. Make
sure that all nozzles are the same type and capacity.
Please see your dealer or the Hardi Spray Technique
book for Nozzle selection guidance.
2 Switch on the EVC using the Controller / Control Box.
3 Activate all distribution valves to the open position.
4 Decrease the pressure until the pressure control
valve handle (A Fig 15) stops rotating (minimum
pressure).
5 Put the tractor in neutral and adjust the PTO
revolutions to the intended travelling speed.
Remember the number of revolutions of the PTO
must be kept between 300-600 rpm (540 pump), or
650-1100 (1000 pump).
6 Increase the pressure until the required pressure is
shown on the pressure gauge.
Pressure equalisation Setup Procedure
1 Close the first section of the distribution valves.
2 Turn the first section adjusting screw (A Fig 16) until
the pressure gauge shows the same pressure again.
3 Adjust the other sections of the distribution valve in the
same way.
Subsequent Adjustments
NOTE! Hereafter adjustment of pressure equalisation
will only be needed when you change to nozzles with
other capacities or the nozzle output increases as the
nozzles wear.
EVC 3 / EVC 4 Operating Unit Valve Cone
Periodically check the distribution valves for proper
sealing. Do this by running the sprayer with clean water
and opening all distribution valves. For maintenance of
the EVC Operating Unit, see your Maintenance and
Service Manual.
HARDI NAVIGATOR
Operating unit
Fig 15
Pressure Equalisation unit
A
Fig 16
EVC Operation while spraying
When the entire boom is closed, the pump output then
returns to the tank. The non-drip diaphragm valves allow
simultaneous closing of all the nozzles.
Vary operating pressure until the required pressure is
shown on the pressure gauge.
To close one or more sections of the boom, close the
relevant distribution valve switch.
The pressure equalisation ensures that the pressure does
not rise in the sections which are to remain open.
Note! If there are problems with the HC 2500 or HC
5500 (and you need to operate the EVC manually):
Please refer to the relevant Operators Manual for
advice on how to disconnect the controller.
NOTE! When the sprayer is not in use, the control box and
the multi plug must be protected against moisture and dirt.
A plastic bag may be used to protect the multi plug.
NOTE! Outputs stated in the nozzle charts are always
based on the pressure measured at boom.
A
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