SECTION 3 -- FIELD OPERATION
3--74
Timed Programme Operation
T imed programme operation is provided primarily for
operation of hydraulic cylinders. This feature allows
the operator to programme a time delay between
when the control levers are activated and when the
oil flow to the implement is stopped.
To operate the electronic remote valves in
programmed mode, depress the appropriate side of
timer control switch (2) as shown. When the switch
is depressed, the green light (1) adjacent to the
remote valve lever will start to flash. The system is
now in standby mode ready to accept a programme
sequence. The light will continue to flash for ten
seconds allowing the operator sufficient time to begin
the programming sequence. If a programme is not
started within this period, the system will
automatically de--activate, depress the timer control
switch again to re--start the sequence.
128
Programming a Double Acting Service
To programme the remote valves, first ensure the
cylinder hydraulic hoses are properly connected to
the appropriate rear remote valve. Start the tractor
engine and set at the normal operating speed in
which the cylinder is to be operated. This is important
as the programming of the control levers is based on
a time interval corresponding to the time it takes the
cylinder rod to extend and retract. Any change in
engine rpm will have an effect on hydraulic flow and
therefore the time taken for the cylinder to extend
and retract.
The timed period for control lever operation remains
the same regardless of oil flow, therefore consistent
operation is required for the system to function
correctly. Using the corresponding timer switch (1)
depress the switch so the light begins to flash. While
the light is flashing move control lever (2) to extend
the cylinder (R). At this point the light ceases to flash
and will remain on.
Hold the lever until the cylinder is extended to the
desired position and then return the lever to the
neutral position. When the lever is returned to the
neutral position the programming light will begin to
flash again indicating the retract phase of the cycle
should now be programmed.
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