Structure and Functions
5.6.4 Electro-hydraulic control (control unit)
Fig. 46
The individual hydraulic components of the
machine are connected to a control block. To
ensure the oil supply, the control block is
connected to the hydraulic system of the tractor
via a double-acting control device or a single-
acting control device and a free return pipe.
If the machine is equipped with an on-board
hydraulic system, it is not necessary to connect
the machine to the hydraulic system of the
tractor.
The electro-hydraulic control (control unit) serves
to actuate the hydraulic functions of the machine
from the tractor if the oil circulation between
tractor and machine has been switched on via
the control device on the tractor.
One control device is required for each function of the machine.
The control unit:
• is differently designed according to the machine’s equipment,
• is mounted on the tractor within view and easy reach such that
the operating elements are easily accessible,
• must be connected to the tractor’s power supply (12 V) via the
three-pole plug (DIN 9680),
• is equipped with several control devices such as key buttons,
toggle switches and a control dial.
The control devices are in touch-control design (key buttons), in latch-
in design (toggle switches) or in control-dial design:
• In touch-control design for folding, swivelling or sliding movable
machine parts, e.g. discharge doors, hydr. counter-cutters,
support stand etc. The function is only carried out when the
control device is activated and kept hold of. As soon as the
control device is released, it returns to its neutral position and
the action is stopped.
• In latch-in design for movements requiring continuous action for
constant loads, e.g. hydraulic motors.
• Control dials for setting the actuating speed of the hydraulic
functions in 10 steps (e.g. conveyor speed for crossover
conveyor / discharge conveyor).
The control devices in touch-control or in latch-in design can be set to
a maximum of 3 positions:
• function I,
• Neutral position,
• function II.
In case of longer downtimes of the machine, switch off the control unit
in order to avoid a discharging of the tractor’s battery due to switched-
on loads.
Verti Mix Double K Edition
87
08.08
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