Eaton ER9.4-10, Руководство пользователя, Страница: 5 / 24

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48
Function
Fig. 1 shows an EATON swash plate pump in W design with proportional valve adjustment
displacement control SP. The ER9.4-10 card measures the actual position of the swash plate using a
swash plate sensor, compares the swash plate angle with the set value, and drives the servo valve
D631. The valve ports are connected to the servo cylinder of the pump. The position of the swash
plate angle, the displacement and the pump outlet flow are proportionally changed to the set value. In
the static state condition (i.e. set value is equal to actual swash plate angle) the valve spool is in
middle position. If the set value is changing, the valve is working until the desired value is reached.
Swash Plate
Sensor
Servo Valve
D 631
Servo Cylinder
Yoke
Solenoid A/B
Solenoid C/D
Set Value
PW
EN
ER
SP1 SP2 SP3 SP4
RP0 IO1 IO2 IO3
+
X2
ER9.4-10
-
Swash Plate Angle
-100
0
100
-10 0 10
Set Value U/I
-100 % +100 %
-100 %
+100 %
Fig. 1: Function of SP-Control