Power Control (T) Operation
The working pressure acts on a rack-pivot via a roller jack which produces a rotating torque, an externally
adjustable spring force counteracts this which determines the power setting.
If the moment generated by working pressure exceeds the moment generated by spring force, the
control valve is actuated by the rack-pivot, and pump reduces displacement. The lever length at the rack-
pivot is shortened and the working pressure can increase at the same rate as the displacement decreases
without the drive powers being exceeded.
(P
B
• V
g
= C).
The hydraulic output power (characteristic T) is influenced by the efficiency of the pump.
T characteristic
Q max
0
0
Flo
w
Pressure
Pressure Compensated Control (P) Principle and Operation
NPNN (Pressure Compensated Control)
on page 9
Load Sensing Control (S) Principle and Operation
NPSN (Pressure Compensated C Load Sensing Control)
on page 11
TPSN Priority
The Pressure Compensated Control (P) has priority over the Power Control (T), Power Control has priority
over Load Sensing Control (S).
Service Manual
D1 High Power Open Circuit Pumps Size 65/130/145/193/260
Operation
16 |
©
Danfoss | July 2019
L1527453 | AX00000292en-CN0201