Electronic belt

Kewei series of belt scale weighing control system Introduction 1 Overview Kewei series of belt scale weighing control system, is based on the dynamic belt scales and batching Kuwait embedded PLC and touch screen control developed by a dedicated control system. Using interactive touchscreen, the Chinese displayed directly load flow, the cumulative weight of information, operation, calibration is particularly convenient. System with automatic zero calibration, automatic calibration interval, fault alarm and automatic diagnostics, optical isolation input / output, standard serial ports, built-in PID control output. 2, environmental parameters 1. Storage temperature - 40 ℃ - + 70 ℃; Operating temperature -10 ℃ - + 50 ℃; 2. Maximum relative humidity: 95% 3. Power · 220VAC + 10% ~ -15% 50Hz · Fuse 0.5 A 4, load cell · Parallel six load cells and input signal range (0 ~ 20mV) · Input resolution: AD conversion internal rate of 300 times / second, the accuracy can reach 16 · Load Cell Shield Ground · wire length (maximum): 100 m to the sensor and wiring requirements: wire sensor signal line should generate electrical interference with other possible separated. 5, the input port 12 digital inputs, two-way high-speed counter inputs, two analog inputs 6, the output port 12-channel digital output, two-way high-speed pulse outputs, two analog output 7, communicate using a standard RS- 232, RS-485 serial interface and PC communication board data acquisition and controller operation, with two-way communication function. 8, the main performance * User-friendly interactive screens, simple and intuitive and easy to operate in real-time regulation of four control modes · · Belt running option, encoder, converter can be combined · material flow or load current output * Total Material heavy pulse output Automatic zero, adjust spacing · weight, chain code, more physical analog calibration mode Automatic zero tracking · A key calibration function ? Instantaneous flow output, analog targeted traffic given · optical coupling The digital inputs and outputs Alarm and troubleshooting tips Communication function: RS232, RS485 multi-drop communication network · the way process control mode: PID control output 9, the main function of all the features of the software are cured in the memory chip, the user operates the touch screen Select the corresponding function is turned on or off the system. (1) measurement functions a, instantaneous flow rate is calculated by weighing the real-time AD value, real-time speed feedback, calculate the instantaneous flow rate. b, the cumulative amount of the cumulative weight is the weight per unit length and run the length of the totalizer. c, auto-zero and auto interval defined by the number of belt loops and belt length is auto-zero and auto-based interval. Accurately calculate the length of the belt, the controller calculated by the number of pulses emitted by the speed sensor when the cumulative number of pulses to the required controller end of the calibration test, the theoretical value and the actual value, and calculates calibration constants. d. auto zero tracking belt running, the set zero tracking range, if the belt scale weighing AD value within the zero tracking range, the system will automatically open the calibration zero function, zero correction. Weighing AD value once beyond the zero tracking range, the system will terminate the zero tracking, wait ten seconds to zero track again. e. a key calibration function belt running, you can use the buttons on a button calibration feature, the system will be a key to calibrate the zero point. f. Two voltage / current inputs, two voltage / current output signal optional expansion unit, get two voltage / current inputs, two voltage / current output signal for setting the target flow rate, the output flow rate, given drive speed. (2) monitoring the state prompted the process of setting error equipment failure alarm high flow, low flow, load, speed alarm (3) automatic control feeding function weighing controller provides a separate control current loop, current loop control is usually to control the feeding amount, the control mode for the PI control - PI = proportional + integral process variables can be controlled for a quantity, flow rate setting by touching the screen, or setting external analog signals. 0-20mA control output current can be set. 10, the system combination regimen system There are three combinations of programs, three combination regimen can be set through the touch screen operation screen setting and switching systems. Three control schemes can achieve dynamic weighing belt scale, it can be combined according to site requirements. (1) Kuwait weighing PLC + Touch Screen + EX1-2AD2DA module + drive + encoder This program is mainly used for real-time traffic site requires regulation to control the feeding amount of belt scale weighing control system. (2) Kuwait Weighing PLC + Touch Screen + EX1-2AD2DA module + encoder This program is mainly used in belt scales only measure the role of materials, not the flow of real-time control system. (3) Kuwait weighing PLC + Touch Screen + EX1-2AD2DA module stable belt scale speed, on-site case weighing less precision, this program also enables dynamic weighing belt scale.