Npnr (Pressure Compensated Control + Remote Pressure Compensated Control) - Danfoss D1 Series Service Manual

Service Manual
D1 High Power Open Circuit Pumps Size 65/130/145/193/260
Operation

NPNR (Pressure Compensated Control + Remote Pressure Compensated Control)

© Danfoss | July 2019
Pressure Compensated Control (P) Principle and Operation
Please refer to NPNN (Pressure Compensated Control)
Remote Pressure Compensated Control (R) Principle
The remote PC control is a two-stage control that allows multiple PC settings. Remote PC controls are
commonly used in applications requiring low and high pressure PC operation.
For this control, Danfoss recommends a load sense setting of 20bar.
Remote Pressure Compensated Control (R) Operation
The remote PC control uses a pilot line connected to an external hydraulic valve. The external valve
changes pressure in the pilot line, causing the PC control to operate at a lower pressure. When the pilot
line is vented to reservoir, the pump maintains pressure at the load sense setting. When pilot flow is
blocked, the pump maintains pressure at the PC setting. An on-off solenoid valve can be used in the pilot
line to create a low-pressure standby mode. A proportional solenoid valve, coupled with a
microprocessor control, can produce an infinite range of operating pressures between the low pressure
standby setting and the PC setting.
R characteristic
Q max
0
0
Pressure
For additional system protection, install a relief valve in the pump outlet line.
D1P 130/145/193/260+NPNR
on page 9.
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