Chongqing ChuanYi | ZHB Series Intelligent Angle Electric Actuator

Scope Of Supply : Actuator Only, Not Include Valve

Brand : CHONGQING CHUANYI ACTUATOR

MFR : SICHUAN INSTRUMENT

ZHB series intelligent angle electric actuator (abbreviated as ZHB actuator or ZHB electric actuator) is an intelligent product produced with German technology, suitable for various process automatic control systems. It accepts control signals from upper-level regulating instruments, outputs angle displacement and mechanical cabinet, controls the opening of various valves and baffles, adjusts the flow of fluid media in process pipelines, and realizes automatic control of process parameters.

　　● Compatible with 4-20mAd.c. analog signals and digital signals that comply with HART communication protocol, the system structure is flexible and adaptable.

　　●Integrated structure, no need for separate servo amplifier, simplifying the system structure.

　　●Intelligent positioning, high precision, good damping performance

　　●It has electric production function, no mechanical brake, no friction loss and long working life.

　　●The zero point and range can be adjusted locally or remotely (products with communication function), which is convenient and quick.

　　●On-site manual operation with buttons and multi-parameter display including adjustment signal and valve position signal.

　　●No contact midway limit to ensure system safety

　　● It has the functions of diagnosing, alarming and processing various faults such as signal disconnection, excessive deviation, motor stalling, overheating, etc.

　　●It has the functions of automatic identification of positive and negative effects, valve flow characteristic conversion, and user-settable flow characteristic curve

　　●Digital filtering, strong anti-interference ability, contactless displacement sensor, high reliability.

　　●Small size and light weight, one-third smaller than traditional similar products.

● Regulation signal input: 4-20mAd.c. Compatible with digital signals that comply with HART or MODBUS bus communication protocols.

● Low voltage switch signal or passive switch signal input

　　●Position feedback signal output: 4-20mAd.c.

　　●Basic error: 1.0%

　　●Backlash: 1%

　　●Dead zone: 1%, adjustment range: 0.3%-3%

　　● Deviation alarm threshold: 5% to 110%. When the deviation alarm occurs, a closed alarm signal is output, and the valve position is maintained locally or moved to the fully open or fully closed position according to the pre-set program.

　　● Mid-range limit: Lower limit: 0%-55%; Upper limit: 45%-100%

　　●Signal disconnection or over-limit protection: When the adjustment signal or feedback signal is interrupted or exceeds the limit, the alarm signal of the closed contact is output, and the valve position is maintained locally or operated to the fully open or fully closed position according to the pre-set program.

　　● Stall protection: When the output shaft of the actuator encounters a mechanical failure and becomes blocked or stuck, a closed contact alarm signal can be issued to cut off the motor current, and then intermittently detect whether the stall fault has been eliminated. When the stall fault has been eliminated, normal operation can be automatically restored.

　　●Fault alarm contact capacity: 5A 220V.ac

　　●Transformation of output stroke characteristics In general, the output displacement of the actuator is linearly related to the input signal. When necessary, it can be set to an equal percentage characteristic, or a linear curve with twenty different slopes to meet special process requirements.

　　●Environmental temperature detection This product has a built-in temperature sensor that can monitor the on-site temperature in real time. If it exceeds the allowable range, an alarm contact signal will be issued.

　　●Rated torque 40—8000Nm (see specification table for details)

　　●Protection grade IP65

　　●Environmental conditions: temperature -25°C to +75°C; high temperature type: -25°C to +85°C

● Relative humidity ≤ 95%, the surrounding air does not contain corrosive media and flammable and explosive substances

● Power supply 220V+_10%50Hz

The signal compilation rules of ZHB intelligent electric actuator are as follows:

　　　 Z —— Electric actuator

　　　H —— Corner type

　　　B ——Intelligent

　　　  □ —–Rated torque (Nm)

　　 　-□ —-Full stroke (S/90), 25s can be left unmarked

　　　  □ —–Select function: H: with HART communication protocol, M: MODBUS bus communication without communication function, no mark

                         E: switch quantity, G: high temperature type

　　Marking example: ZHB250-25H indicates an intelligent electric actuator with a rated torque of 250 Nm, a rated travel time of 25 (s/90°), and a HART communication function.

The ZHB electric actuator consists of four parts: controller, drive motor, reducer and displacement detection mechanism. The functions and working principles of each part are briefly introduced as follows

　　Controller​

　　　The principle of the actuator: After the 4-20mAd.c. adjustment signal from the upper regulating instrument is converted by A/D, it is compared with the valve position signal in the single-chip microcomputer to output the switch signal, which is used to drive the forward and reverse rotation of the servo motor, and drive the valve after mechanical deceleration conversion. The valve position opening is detected by the displacement sensor and converted into a voltage signal proportional to the displacement. This signal is used for regulation and control after A/D conversion. Inside the MPU, the valve position signal undergoes various transformations to transform the valve stroke characteristics. The actuator has two working conditions: automatic and manual. In the automatic working condition, the valve position opening is controlled by the regulating input signal and the regulating signal is tracked in real time; in the manual working condition, the valve position opening is controlled by the manual operation key switch. After the valve position signal is converted and reversed inside the MPU, it is converted by D/A and V/A to output 4-20mAd.c. for system display and tracking control.

The fault diagnosis functions of the actuator are as follows:

　　　1. Adjustment signal disconnection; 2. Feedback signal disconnection; 3. Motor stalling; 4. Large deviation fault

When a fault occurs, the system will take appropriate action.

　　● Drive motor

　　　The drive motor is the power source of the actuator. The operation reliability and positioning stability of the drive motor are greatly improved, and the drive motor can run for a long time without failure and adjustment.

　　● Reducer

　　　The reducer has a high-efficiency floating planetary reduction transmission mechanism with mechanical self-locking. It converts the high-speed, low-torque motion output by the drive motor into a low-speed, high-torque output and drives the adjustment mechanism.

　　● Displacement detection mechanism

　　　The displacement detection mechanism converts the mechanical change of the output shaft of the actuator into an electrical signal in proportion through a differential pressure device, and inputs it into the controller to participate in the adjustment and control of the actuator. At the same time, it can be sent back to the control room for monitoring and management in the control room. In this detection mechanism, two limit micro switches are set to ensure accurate operation, and two sets of switch quantity signals can be output at the same time to participate in system control.