Eton e4 Manual do Utilizador descarregar pdf (Página 7)

7 EATON 420 Mobile Piston Pump Technical Manual E-PUPI-TM002-E4 November 2014

“B” inlet

“F” case

drain

“C” outlet

To load

“J” load

sense

signal

port

Optional bleed-down orice in

Code A or B with control special feaure "A".

ø 0,4 mm (.015 in.). Orice is plugged for

no bleed down in control Code A or B.

�

�

“K” inlet

gage port

(optional)

“K”outlet

gage port

(optional)

Control Options

Load Sense and Pressure

Compensator

Load Sense and Pressure

Compensator Control

The pump will provide power

matching of pump output to

system load demand, maxi-

mizing efciency and improv-

ing load metering characteris-

tics of any directional control

valve installed between the

pump and the load.

Load sensing ensures that

the pump always provides

only the amount of ow

needed by the load. At the

same time, the pump operat-

ing pressure adjusts to the

actual load pressure plus a

pressure differential required

for the control action. When

the system is not demanding

power, the load sense control

will operate in an energy-

saving stand-by mode.

Typically, the differential

pressure is that between the

pressure inlet and service

port of a proportionally

controlled directional valve,

or a load sensing directional

control valve. See the model

code on page 4 for differen-

tial pressure settings for load

sensing.

If the load pressure exceeds

the system pressure setting,

the pressure compensator

de-strokes the pump. The

load sensing line must be

as short as possible and can

also be used for remote con-

trol or unloading of the pump

pressure. For remote control

purposes, it is recommended

that you contact your Eaton

Representative for the cor-

rect conguration of the

control.

Warning: The pressure com-

pensator may be adjusted

beyond the rated pressure of

the pump. When adjusting

the pressure limiter, install a

0-350 bar (0-5000 psi) gage

in the outlet gage port and

limit the pressure setting to

the continuous rated pres-

sure for the pump displace-

ment shown on page 6.

Flow Compensator

(Load Sense) Settings

There are three springs

used to cover the load

sense adjustment range

of this control.

Pressure Limit Settings

The pressure compensator

uses two springs to cover

the full pressure range of

the ADU pumps. The high

pressure spring covers the

range from 140 bar (2050

psi) to 280 bar (4060 psi).

The low pressure spring

is adjustable from minimum

pressure through 140 bar

(2050 psi).

Typical Operating Curve

Dynamic Response per SAE J745 (Using Swash Plate Position)

Response Recovery Load Sense

(off stroke) (on stroke) Recovery

msec msec msec

ADU041 20 75 90

ADU049 20 75 90

ADU062 25 90 115

ADU080 26 75 115

Outlet Pressure

Outlet Flow

Q

P

Outlet Pressure

Outlet Flow

Q

P

Code C - Page 8Code A & B - Page 7

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