Belarus 3522.5, Operator'S Manual

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3522.5-0000010
РЭ
174
3.16.4 Distributor
3.16.4.1 General information
The tractors BELARUS-3522.5 are equipped with integrated block, which consists
of four distributive sections of EHS type, of electrohydraulic regulator EHR-23LS, of end
plate with pressure reducing valve and of discharge cover.
Distributive section EHS represent integrated product that consists of hydraulic and
electronic part. Structure of distributive section EHS, its operation principle and main func-
tions are shown in figures 3.16.8 and 3.16.9.
Figure 3.16.8 – Structure diagram of distributive section EHS.
The hydraulic part consists of operated center slide-valve that regulate flow value,
necessary for agricultural implement (for external consumer of hydraulic flow). The center
slide-valve is pressure-operated and pressure is regulated with a help of proportional elec-
tromagnet valve (directional valve), built into distributor. Built-in electronic card (digital
electronics) receives control signal from tractor cab from the operator, than handles this
signal and controls proportional electromagnet valve, that joints chambers of control piston
with pressure or with drain and in such way ensure the movement of center slide-valve in
following positions: “up”, “neutral”, “down”, “floating position” and make it possible to regu-
late flow in working positions.
The positions of slide-valve are controlled by means of inductive displacement
pickup and digital electronics according to set program. In case of power-down, directive
valve comes back in starting position. At this moment the spring of slide-valve moves it in
neutral position. Different examples of EHS section conditions at performance of different
functions are shown in figure 3.16.9.
Diagnose:
- visual display unit
- fault signal
Directional valve
Changeble valve
Digital
electronics
Inductive
displacement pickup
Control piston
Return spring
Pressure compensator
Settings
-CAN
-PWM
-Pot resistor
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