MT2101 Ramsey Weighing Controller
delivery time：3 days
Weighing control instrument is a microcomputer-based dynamic belt scale and meter for batching control. Using human-machine dialogue on the VFD screen, the weighing flow is directly displayed in Chinese, and relevant information is accumulated. Operation and calibration are particularly convenient. The meter has automatic zero calibration, automatic interval calibration, automatic fault alarm diagnosis, optically isolated input / output, standard serial port, built-in PID control output.
Environmental parameters
1. Storage temperature-40 ℃ —— + 70 ℃;
Operating temperature -10 ℃ —— + 50 ℃;
2. High relative humidity: 95%
3.Power
220VAC ＋ 10% ~ -15% 50Hz
Fuse 0.5A
EMI / RFI filters
4.Weighing sensor
The meter provides 10VDC, 200mA excitation power, and can connect 4 load cells in parallel
Sensitivity, 0.5mV / V－3.5mV / V
Large input signal 33mV
Load sensor shield ground
When the cable distance is greater than 60 meters (not more than 900 meters), the excitation compensation circuit jumper is used to select local or remote compensation.
5. Motherboard digital input port
The instrument main board provides 3 programmable input ports to receive dry contact switch signals.
6. Motherboard digital output port
The instrument main board provides 3 programmable output ports, 24VDC open collector output, which can directly drive the control relay.
Communication board
The instrument can be installed with a communication board. Can use standard RS-232, RS-485 serial interface and upper computer communication board to collect instrument data and operate the instrument, with two-way communication function.
8.Main performance
Four-line display, selectable via menu
5 status indicators
Material flow or load current output
Pulse output of total material weight
Automatic zero adjustment and adjustment interval
Automatic zero tracking
Photoelectrically Coupled Digital Inputs and Outputs
Alarms and faults
Communication function: RS232, RS485 multi-station communication network
One way process control mode: PID control output
9.Main functions
All functions of the software are fixed in the memory chip. When the user installs an optional expansion board or the operator selects it through the keyboard, the controller will automatically open the corresponding function.
(1) Measurement function
a. Instantaneous flow calculation
The load cell output unit weight signal is multiplied by the speed sensor output unit belt speed signal, and the result is the instantaneous flow.
b. Weight accumulation
Cumulative quantity is the accumulation of weight per unit length and running length, and then converted into engineering units.
C. Auto-zero and auto-adjust interval
By defining the number of belt loops and the length of the belt, it is the basis of automatic zero adjustment and automatic adjustment interval.
To accurately calculate the length of the belt, the controller calculates the number of pulses sent by the speed sensor. When the required pulse number is accumulated, the controller ends the calibration test, compares the theoretical value with the actual value, and calculates the calibration constant.
d. Automatic zero tracking
When the belt is running, the flow rate is lower than the predetermined value, and the controller performs automatic zero adjustment according to the following steps
——Wait for half the test period (“Z” will be displayed)
——Complete a zero test
——Complete the automatic zero adjustment of a test cycle
――As long as the flow value is lower than the preset value of automatic zero tracking, the meter will repeat the above steps continuously.
e. One input and two current output signals
Optional input / output expansion board, get one voltage / current input, two current output signals
(2) Monitoring function
Status prompt
Process alarm
Wrong setting
Equipment failure
High flow, low flow, high load, low load alarm
(3) Automatic control feeding function
The weighing controller provides an independent control current loop. The control current loop is usually used to control the feeding amount. The control method is
—— PID = Proportion + Integral + Derivative
The controllable process variable is the feed amount, and the flow rate setting can be set through the keyboard input or external analog signals. The control output is a 4-20mA current loop.
Fully digital operation, with excellent drift-free stability in processing integration and accumulation;
All data and instructions are operated on the panel and key input, which is simple and convenient;
With automatic zero adjustment, automatic interval adjustment, automatic diagnosis, data retention during power failure, etc .; and optional automatic zero tracking function;
Unique electronic calibration function, the operator only needs to press the button, the system can automatically calibrate, can replace the material calibration, and can also be used to check the stability of the belt during the calibration;
You can choose a variety of verification methods such as hanging code, chain code, and physical object;
Wall-mounted and embedded enclosures are optional, the enclosure is closed, and it has waterproof, dust-proof and anti-corrosion properties;
Remote transmission counting function (optional), can be connected with mechanical or electronic counter;
Multi-point display function (optional), observe the operation of the same belt scale at different locations;
Current output interface (optional), can output 0-20mA or 4-20mA current proportional to the flow;
Communication interface (optional), standard RS-232, RS-485C interface;
Print interface and printer (optional):
Form factor: wall-mounted and embedded
