1. Product Introduction

MN series electric actuator is a new generation of electric actuator independently developed by our company on the basis of the original mature products, combined with domestic and foreign experience and technology. The product has good anti-interference technology, convenient debugging operation, intuitive man-machine dialogue interface and so on. It is suitable for automatic control of gate valves, ball valves, globe valves, throttle valves, diaphragm valves, etc., and can realize on-site and remote operation of controlled valves. The product can be widely used in electric power, building materials, metallurgy, petroleum, chemical, municipal, new energy and other industrial fields.

The performance and technical indicators of MN series electric actuators meet the requirements of JB/T8219-2016 "Electric Actuators for Industrial Process Measurement and Control Systems" and JB/T8528-1997 "Technical Conditions for Common Valve Electric Devices. The performance of explosion-proof type conforms to GB3836.1-2000 "Electrical Equipment for Explosive Gas Environment Part I: General Requirements", GB3836.2-2000 "Electrical Equipment for Explosive Gas Environment Part II: Flameproof Type" D ", JB/T8529-1997" Technical Conditions for Flameproof Electric Devices ", GB 12476.1-2013" Electrical Equipment for Combustible Dust Environment Part 1: General Requirements "and GB12476.5-2013" Electrical Equipment for Combustible Dust Environment Part 5: Shell Protection Type "tD.

2. product features

1. Enclosure protection

The actuator shell is made of high-pressure cast aluminum alloy shell, and the outer surface is coated with epoxy powder. It has strong anti-ultraviolet, corrosion resistance and high fullness, which can comprehensively improve the service life and self-cleaning of the coating and adapt to various harsh production environments. The protection grade of the enclosure is above IP67. In explosion-proof places, it can meet the requirements of Exd II BT4 standard.

2. Power transmission

The main drive of the actuator is composed of high-strength alloy worm gears and worms. Precision processing reduces the transmission resistance to the greatest extent. In addition, it is combined with lubricating oil that adapts to different environmental temperatures to make it fully lubricated and more adaptable to different environmental conditions., Also maximize the service life.

3. Motor monitoring and protection

The motor adopts low inertia, high torque servo motor, so that the motor can quickly reach the peak torque after starting;

Overheating protection: There is a precise temperature sensor in the motor. When the temperature exceeds the rated value, the motor is prohibited from running and the motor overheating alarm information is displayed to avoid damage caused by the motor overheating.

Instantaneous reversal protection: The instantaneous reversal delay control technology is adopted. When the reverse operation signal is received during the operation of the actuator, the control system will stop first, and then perform the reverse action after delay to prevent the damage of mechanical transmission parts.

Electronic brake: Adjustable electric actuator through the dead zone setting and electronic brake, to ensure that the valve stops in the set valve position.

4. Output interface

The actuator flange conforms to ISO5210/5211(GB12222/12223) standard, and also provides flange interface conforming to JB2920 standard, and can be specially customized according to customer requirements.

5. Man-machine interface liquid crystal display

Using high brightness and high definition LCD liquid crystal display and simple and convenient operation panel, Chinese, digital display torque, valve position, limit setting and other working status and alarm, convenient on-site operation and on-site setting parameters, even at night can also be clearly observed.

6. Highly integrated control circuit

Mature and reliable control circuit design, through large-scale integrated circuit technology, reduce the number of discrete components, improve the overall reliability; the use of inertial adaptive step control strategy to effectively solve the problem of motor inertia, to achieve accurate positioning, improve control accuracy.

As the main part of the intelligent type, the electrical control module has the functions of remote control, emergency action, remote holding, remote opening, remote closing, etc., which elevates the valve electric operation mode to a higher level.

· Provide field programmable monostable relay feedback

· Provide alarm monostable relay feedback

Input and output signal channels through photoelectric isolation (can withstand 2000V surge voltage)

Position feedback 4-20mA signal, load resistance: 50Ω-750Ω, accuracy: 0.5 ~ 3% adjustable.

7. Sealing structure

The actuator adopts double seal design structure, and the joint surface is designed with circular structure. The combination of long stop and sealing ring ensures good sealing performance and ensures that the actuator can be completely waterproof, dustproof and prevent the invasion of various gases. The standard product protection grade is IP67, up to IP68.

8. Intelligent infrared remote control function

The actuator adopts advanced infrared remote control technology, and the man-machine dialogue can be carried out through the sealed dialogue window without opening the actuator box cover. The intelligent remote control includes remote switch control, remote automatic control, on-site stop and other functions. Remote assistance operation function, instead of a single manual operating system, more convenient, simple, safe and effective.

9. Intelligent self-detection, diagnosis and protection function

It has intelligent self-checking and error alarm function. When the electric actuator is connected to the power supply, it will automatically detect the functional components of the actuator to ensure that there is no fault. In the course of operation, the functional components are monitored in real time. Once a fault occurs, the actuator will be prohibited from running immediately, and the on-site and remote alarm signals will be sent out at the same time, so that users can quickly find out the cause of the fault and recover in time.

Automatic phase sequence identification: Using photoelectric isolation phase sequence automatic identification circuit, the user can access the power line according to any phase sequence, and the valve always runs in the correct direction.

Lack of phase protection: the lack of any phase of the three-phase power supply prohibits the operation of the motor and displays the lack of phase alarm information.

Prohibit delay protection function: when the control model is input at the same time, the system is disabled and automatically delays reversing.

ESD protection: flexible emergency protection function is provided. The emergency action control mode is set through parameters, and the action mode during emergency protection can be set separately, such as full open, full close or hold position. (Intelligent)

Control state protection: the remote, on-site or stop state can be locked through the mechanical lock on the electrical box cover to avoid misoperation; for changing parameter settings, a password is required to enter the setting interface.

Intelligent network security protection (intelligent optional): supports dual redundant fieldbus communication.

9. On-site control

The magnetic rotary switch is used to realize the control state conversion between field and remote, the parameter setting of on-site switch valve control and electric device (intelligent type) under the condition of being completely isolated from the electrical box.

10. Bus control function

The communication module adopts an independent structure superimposed on the main board to meet the needs of different communication media and different communication protocol systems. Currently supported communication protocols include Modbus RTU, PROFIBUS-DPV0/DPV1, HART, etc.

11. Accurate valve position stroke measurement and protection

The actuator uses an absolute encoder to measure the valve position stroke, which has a high angular resolution. The encoder is integrated with magnetoelectricity. In the case of loss of power supply, manual operation of the actuator does not need to worry about the loss of valve position. The advanced boundary anti-jitter technology is adopted to ensure high-speed, stable and reliable output data, and effectively improve the stability and reliability of the system.

12. Hand/electric operation

MN series electric actuators are divided into top-mounted handwheel and side-mounted handwheel according to the different installation positions of the handwheel. Among them, the top-mounted handwheel is electric priority, and the side-mounted handwheel is manual priority. When manual operation is required, only the clutch handle needs to be changed. The operation of the top-mounted handwheel is to turn the manual clutch handle towards the handwheel, and the obvious resistance of shaking the handwheel is increased to be manually operated, and the clutch handle will automatically reset during electric operation. When the side-mounted handwheel is manually operated, the locking pin must be pulled out first, and the manual shaft must be pushed inward. At this time, the locking pin locks the manual shaft, and the hand wheel can be rotated for manual operation, the manual shaft automatically pops up and returns to the electric state under the reaction force of the compression spring.

13. Moment measurement

The professionally designed torque measurement system can realize actuator overload protection.

The mechanical torque measurement system achieves the purpose of measuring torque by using the deformation of the force measuring spring. And by adjusting the position of the torque switch, to achieve torque adjustment.

Electronic torque measurement: By detecting the real-time current, voltage and magnetic flux of the motor, and cooperating with the single-chip microcomputer for comprehensive calculation, the output torque is obtained, continuous measurement is realized, and real-time monitoring is possible, which improves the reliability of the system. (optional)

Classification of 3. electric actuators

According to the movement mode of the driven device, it is divided into: MN multi-rotation and MN RS partial rotation;

According to the operating environment of the actuator: outdoor type and flameproof type;

According to the control performance of the actuator, it is divided into ordinary type and intelligent type;

According to the control mode of the actuator, it is divided into basic type, switch type and adjustment type.

4. model representation method

When the user orders, please mark the electric actuator as follows

 

Power head base type	Reducer code	Output torque	Power	Travel time	Connection mode	Control mode
MN	RS	250	/F	30	H	ZT
MN-multiple slewing	RS-angular travel	2500 nm	K single-phase power supply F Three-phase power supply	30 seconds	H-Base type Z-Direct Connect	Basic Type-No Letter Representation S-integral switch type M-Overall regulation type IS-Smart Switch Type (Non-Intrusive) IM-intelligent adjustment type (non-invasive)

 

Example: MN-10/KIS means multi-turn actuator output torque 100Nm, single-phase power supply, intelligent switch type.

MN RS250/F30HM indicates that the output torque of the partial rotary actuator is 2500Nm, three-phase power supply, 90 travel time is 30 seconds, base type and overall adjustment type.

Basic technical indicators of 5. products

● Input control signal: a) analog signal 4 ~ 20mA;B) passive contact control

● Input channel resistance: 250Ω

● Feedback signal: A)4 ~ 20mA;B) passive contact signal at fully open and fully closed positions

Sensitivity: 0.5 ~ 3%

● Damping characteristics: 0 oscillation

Basic error: 1% ~ 1.5

● Enclosure protection grade: standard IP67 (special order IP68)

● Motor insulation class: Class F

● Power supply voltage: AC 220V 10% ~ 15%; AC 380V 10%; Optional power supply: AC110 ~ 440V,50, 60Hz (to be explained when ordering).

● Working system: the switch type is 30%, within 15min; The adjustment type is 50%, and the number of starts per hour is less than 600 times. 100, the number of starts per hour is less than 1200.

●Ambient temperature on site:-20 ℃ ~ 70 ℃

● Use site environment humidity: ≤ 95% without condensation

● Insulation resistance: between input terminal and chassis: ≥ 20MΩ; Between power terminal and chassis: ≥ 50MΩ; Between input terminal and power terminal: ≥ 50MΩ

● Insulation strength: 500V between input terminal and chassis; 500V between input terminal and power terminal; 220V power supply 1500V,380V power supply 2000V between power supply terminal and chassis

● Drift: 48 hours of drift is not greater than 1.0% of the rated travel

● Explosion-proof mark: Exd II BT4