Pump Service Manual
XD5-100-A1
Phone: (402) 727-9700
Website: www.Oilgear.com
905 S. Downing Street, Fremont, NE 68025
Page 10 of 31
Issue Date: 1/4/2021
910003
6.1.2
Pressure Compensator and Load Sense, P-1NN/F or P-1NN/B
The Pressure Comp/Load Sense Control allows the system designer
to control both the flow and pressure at the outlet to the pump.
6.1.2.1
Function
The system designer provides 2 components for a load sense
circuit:
•
A flow restriction between the outlet of the pump and the
implements, like an orifice or a flow control valve.
•
A pressure signal from the circuit, downstream of the
restriction and plumbed into the LS/RP Port in
For more information, please see the circuit diagram in
Section 6.1.1.4
Additionally, 2 values are chosen and adjusted in the Control:
P
comp
Compensator Pressure, set in the Pres. Comp. Adjuster
P
ls
Load Sense Pressure, set in the Load Sense Adjuster
The Control will regulate the outlet flow so that the pressure loss
across the restriction in the system is always equal to
P
ls
. Flow is
proportional to the restriction area size and the pressure
differential. If the restriction increases or decreases, the Control
will change the stroke of the pump to mirror the change in the
restriction. For example, if the control valve in the system is closed
slightly, the pump will de-stroke slightly so that the pressure loss
across the valve in the system equals the setting of the Load Sense
Adjuster.
The pressure compensator is still active. If
P
outlet
rises above
P
comp
,
the Control will supersede the Load Sense to de-stroke the pump
until
P
outlet
≤
P
comp
.
6.1.2.2
How to Adjust
The Load Sense is adjusted using the LS Adjuster, mounted on the
Control Block. The LS Adjuster appears in
Adjuster:
3/16 in. Internal Hex
Range:
200
–
500 psi [13.8 to 34.5 bar]
Rate:
56 psi [3.9 bar] per turn
The Pressure Compensator is adjusted using the PC Adjuster,
mounted on the Control Block as shown in
Adjuster:
3/16 in. Internal Hex
Range:
500
–
5,000 psi [13.8 to 345 bar]
Rate:
485 psi [33.4 bar] per turn
Figure 6 - Pressure Comp/Load Sense Response
Figure 7 - Load Sense Adjuster
Figure 8 - LS/RP Port Location
