Black Bruin BB 4, Руководство по эксплуатации продукта

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System Design
Motor hydraulic circuit
Simple connection
Figure 27. A simple motor hydraulic circuit in an open loop hydraulic system.
In an open loop hydraulic system the hydraulic circuit of the motor is usually
implemented roughly as in the figure above.
• Select the operating direction with the directional control valve (1) by applying the
working pressure (P) to the other working line (A or B).
• The minimum pressure (see Working line pressure on page 42) required in the
return line (T) is created with the cracking pressure of the check valve (2).
• The case drain line port (C) is connected to the system reservoir (T0) as directly as
possible.
Attention:
The case drain line of the motor must always be connected to a reservoir,
even during freewheeling. The case pressure of the motor may rise
significantly, if the motor is completely plugged during use.
Note:
Using the motor on a closed loop hydraulic system is different from the
open loop system. The closed loop system is more complex, but enables
more functions, such as hydrostatic braking, series connection and
counter pressure operation.
Counter pressure operation
Counter pressure operation is needed mainly in series connection (see Motors in
parallel or series circuit on page 39). Counter pressure operation means using the
motor with high back pressure in the return line.
The counter pressure operation affects the torque output of the motor due to
decreased pressure difference over the working lines.
Attention:
Make sure the combined pressure in the working lines does not exceed the
permissible values of the working pressure during counter pressure
operation.
4
4.1
4.1.1
4.1.2
System Design
Product Manual 33