I. Preface

The process of a hydraulic press generally includes actions such as rapid descent, slow descent, working pressurization, pressure holding, pressure relief return, floating side pressing, and ejection. The working pressure and flow rate required for each action are different. In a quantitative pump hydraulic system, the oil pump motor provides a constant flow rate at a constant speed, while the required working pressure and flow rate are adjusted by the pressure proportional valve and flow proportional valve. The size of the pressure and flow rate is controlled by adjusting the opening of the pressure or flow proportional valve. Excess hydraulic oil flows back through the overflow valve; this process is called high-pressure throttling. Statistics show that energy losses due to high-pressure overflow can reach 36% to 68%.

II. Introduction to Hydraulic Presses

A hydraulic press (a type of press) is a machine that uses special hydraulic oil as the working medium and a hydraulic pump as the power source. The pump's force causes the hydraulic oil to enter the cylinder/piston through hydraulic lines. The cylinder/piston contains several sets of cooperating seals; the seals in different positions are different but all play a sealing role, preventing hydraulic oil leakage. Finally, a one-way valve allows the hydraulic oil to circulate in the oil tank, enabling the cylinder/piston to perform cyclical work and thus complete a certain mechanical action as a productive force.

III. Introduction to the SD610 Electro-Hydraulic Servo System

The electro-hydraulic servo system replaces the original quantitative pump-asynchronous system with a large overflow with the existing precision servo hydraulic system. This achieves the on-demand supply characteristic of hydraulic oil, resulting in almost no overflow in the new hydraulic system. Its main components are as follows: Motor 系统替换为现有的精密伺服液压系统，实现液压油的按需供给特性，使得新的液压系统几乎没有溢流，其构成主要由如下部分：

1. Driver

The driver uses a unique motor control algorithm for electro-hydraulic servo characteristics, achieving fast and stable pressure and flow control. It features a large margin design, does not operate in high-temperature environments, and is convenient to install and debug.

Our company has developed a liquid-cooled series driver for harsh working environments, which has the advantages of high temperature resistance, corrosion resistance, and insensitivity to environmental influences.

2. Motor

Permanent Magnet Servo Motor Using the latest generation of rare-earth permanent magnet materials, it features small size, low inertia, high performance, high efficiency, low noise, fast response, stable operation, high control accuracy, strong overload capacity, and significant energy saving under continuous load.

3. Oil Pump

Depending on the usage environment and requirements, gear pumps, plunger pumps, and screw pumps can be used in electro-hydraulic servos.

Gear pump: Strong anti-pollution ability, long service life, good self-priming ability, simple structure, easy maintenance.

Plunger pump: High precision, good sealing, high working pressure.

Screw pump: Low noise, high speed, small pulsation.

4. Pressure Sensor

Pressure sensors can be current type (4~20mA) or voltage type (0~10DC). When selecting, refer to parameters such as sensitivity, offset, linearity, and hysteresis. Since the feedback signal directly affects system performance, high-precision, high-sensitivity, and good linearity brands should be used as much as possible.

IV. SD610 Electro-Hydraulic Servo System Wiring Diagram and On-site Photos

V. Parameter Settings

1. Motor Parameter Self-Learning

When Pr9.24 is set to 2, the driver automatically performs motor parameter self-learning. When a number is displayed, the motor parameter self-learning is complete.

2. Function Parameter Settings:

VI. Debugging Instructions

1. After setting the parameters, press the drive's JOG button to check the motor direction. If the motor rotates in reverse, swap any two motor wires, then re-learn the motor parameters. Remember to check the motor direction first.

2. During debugging, monitor the values of U-01, U-02, U-03, U-04, U-05, and U0-12.

3. When setting parameters, please turn off the enable to ensure that the green Run light is off, because the drive parameters cannot be set when Pr2.02=1 terminal enable is on.

VII. Summary

The Weicreation SD610 electro-hydraulic servo system can detect pressure and flow signals from the hydraulic press CNC system in real time, adjusting the motor speed required for various operating conditions in real time, allowing the pump output flow and pressure to meet the system's needs, while allowing the motor to run at low speed in non-operating states, truly achieving the principle of providing only what is needed, resulting in significant energy savings. The Weicreation SD610 electro-hydraulic servo system perfectly addresses customer requirements for cost, efficiency, oil temperature, and precision while meeting performance and stability requirements. Electro-hydraulic servo drive technology is the future direction of hydraulic presses.