Designed for A10VSO variable pumps, the ED72 electric proportional control/regulator uses a 24V DC command and 50 to 600 mA control range to adjust pressure from 20 to 250 or 280 bar. It supports smoother electronic pump management in excavators, loaders, cranes, agricultural machinery and industrial power units, helping reduce pressure swings, slow response, excess output and repeated manual adjustment during changing loads in field conditions.
1. Negative Control Characteristic: Increasing the command current lowers the control pressure, matching hydraulic systems that use inverse electronic regulation.
2. Servo Feedback Action: The feedback mechanism helps settle the servo piston at the required position for more consistent pump displacement control.
3. Continuous Duty Capability: The specified valve design supports extended energized operation when used within the approved electrical and thermal conditions.
4. Dither Support: A suitable dither signal can help reduce stick slip behavior and improve low level control smoothness.
5. Standard Electrical Connection: The specified DIN style solenoid connection supports practical wiring, inspection and replacement in industrial control cabinets.
FAQ
Q1: What does the ED72 regulator do on an A10VSO pump?
A: The ED72 converts an electrical command into hydraulic pump control. It changes the pump control pressure and influences displacement, allowing the A10VSO pump output to respond to changing machine requirements.
Q2: What voltage and control current does the ED72 require?
A: The product page lists a 24V DC supply and a 50 to 600 mA control current range. The controller or amplifier must be matched to the correct signal range before commissioning.
Q3: Why does the A10VSO pump remain at maximum or minimum output?
A: Check the command signal, amplifier output, coil connection, wiring, pump control pressure and hydraulic supply. Also confirm that the system uses the correct negative control logic. An incorrect signal direction can cause the pump to respond opposite to the operator's expectation.
Q4: Why does the pump pressure fluctuate after installing an ED72 valve?
A: Possible causes include unstable control current, signal noise, incorrect calibration, contaminated oil, air in the control circuit or unsuitable pump speed and load conditions. Check the electrical command and hydraulic pressure together instead of adjusting the regulator alone.
Q5: Can the ED72 be used with every A10VSO pump?
A: It is intended for A10VSO variable pumps, but the exact series, size, control code, solenoid specification and connector must be confirmed. Series 31 and Series 32 components should not be assumed interchangeable without checking the complete model code.
Q6: Does the ED72 provide closed loop pressure control by itself?
A: The ED72 provides electrohydraulic proportional pump control. A complete closed loop pressure system may also require a pressure sensor, controller and suitable feedback programming. Confirm the control architecture before describing the product as a standalone closed loop regulator.
