How the control system works
The circuit diagram of W-2200 electronic control board is shown in Figure 3-44. After the loom is connected to the power supply, each transformer and logic control unit are energized, and the start-up plan is made. When the “READY” button is pressed, the dehumidification air pump and the weft storage air pump (for SR and RD length measurement) start running to make preparations for the start-up; for the electronic weft selection system, its power supply and yarn preparation system also start working. When the “RUN” button is turned on, the main motor of the loom starts instantaneously, the loom starts running, and the weft detection unit and other fault detection units also start working to monitor the working status of the loom. When encountering any of the following situations: the weft detection unit sends out a weft missing signal, the fault detection unit sends out a fault signal, the button sends out a stop command, the electronic weft selection sends out a weft missing signal, etc., the control unit stops the main motor through the actuator, The electromagnetic brake is energized to quickly position and stop the vehicle. When the machine is stopped, when the water-jet loom is pressed and the plan button is not pressed, the “jog forward” or “jog reverse” operation can be directly performed, and the “forward” or “reverse” jog operation can be performed. The jog step length can be adjusted. At the same time, for the “reverse” operation, you can choose “reverse one week”. When the machine is stopped, press the “BREAK” button of the water-jet loom to release the brake, making it easier to manually turn the machine for adjustment. The ZW series loom operating system does not have a “RUN” button. The operation of the operation is completed directly by using the “FORWORD” (forward rotation) button (after the plan button is operated, pressing the forward button is to run; without pressing the plan button, directly pressing the forward button is to jog). The positioning and stopping of the loom, fault detection, weft detection, etc. are all controlled by proximity switches or angle sensors (electrical encoders) for timing control. The positioning and parking of the loom is completed by the braking unit and electromagnetic brake. 1. Working principle of LW series electronic control board The LW electronic control board uses HD64180CPU as the central control. The signal processing and analysis of the loom are controlled by it. The main control program is stored in memory 27256. Its operating software consists of a main control program module and an interrupt service program module. After the loom is started, the computer immediately inputs the monitoring signal from the input port and then infers and processes it. The LW series logic unit (main control unit) directly controls the various working states of the motor (start, stop, brake), and monitors the current status of the process contacts at any time to make corresponding countermeasures. Logic unit settings include: main motor over-torque time adjustment; reverse braking time adjustment; inching time, mode, and interval time adjustment; braking time adjustment; length counting method selection. Comprehensive signal processing and output control include weft detection faults, LP signal trailing edge faults, HP faults, etc. When the weft detection signal is normal, LP5 generates a negative pulse from high level to low level in the PS working area; when the weft detection signal is abnormal, LP5 will have a fixed high level. After this signal is synthesized by the circuit output and the synchronous timing signal, it is output by the reverse driver to the F-OUT point. When a fault occurs, this point outputs a negative pulse. Integral voltage comprehensive processing: The LP4 signal of this unit is provided to the comparison circuit and to the signal synthesis output circuit, whose function is to display the integral adjustment status. The first part is the wind value detection circuit and also provides the integral comparison voltage. When normal, the integrated voltage display tube is always on; when the voltage is too high, the end-of-generation tube flashes; when the vehicle is stopped and there is no integrated voltage, the end-of-generation tube goes out. 2. Working principle of ZW series electronic control board ZW series electronic control board takes the logic control circuit as the core and uses CPU control. It accepts and detects various instructions and working status, performs logical analysis and inference, and decides the future status of the loom. Most of the input and output circuits of the operating status monitoring signals of the electronic control panel are fully electrically coupled. Multiple toggle switches in the electric control panel can be used to select various working states. The following adjustments can be made in the electronic control panel: weft signal input delay and inference delay; braking delay; inching time adjustment; reversal time adjustment, etc. 3. Working principle of PLC electronic control board PLC electronic control board uses a programmable manipulator as the core of logical control of the loom to receive and detect various operating instructions and working status, process them, and then control them with their output points Driving components to realize the working state of the loom. All input and output points of the PLC electronic control board have LED displays. When in use, you can easily view the working status of each place. The PLC electronic control board can use the built-in potentiometer on the programmable manipulator to make the following adjustments: starting time; let-off delay time, etc. 4. Principle of weft detection circuit (1) Principle of touch-finger weft detection: When the loom is running, the water flow and the water-containing weft wire are in contact with the probe. Due to the conductivity of the water, a certain current flows from the high-voltage side probe to the low-voltage side. probe, so that the weft finder signal processing unit receives the required weft signal. The signals received here include: weft signal, water signal, weft tail signal and leakage signal. The weft detection signal processing unit processes this mixed signal, filters out useless signals, and retains and amplifies the weft signal. The signal processing unit uses the PS signal to perform time period manipulation, counts and compares the amplified and shaped weft detection signals, and then outputs work instructions. The waveform received by the weft probe is shown in Figure 3-45.
The principle of ZW series weft detection is shown in Figure 3-47. The weft detection circuit is generally composed of the following parts:��: input signal, status monitoring signal, shaping circuit, integrating circuit, comparison circuit, processing circuit and output circuit, etc. The input signals mainly include: weft detection signal (LP), timing signal (PS), missing weft analog signal (OPT), high-voltage power supply signal (HP), and status monitoring signal. Signal processing: After the weft detection signal is processed, a new signal is formed and provided to the final stage of signal synthesis. It mainly includes shaping circuit, detection circuit, integrating circuit and comparison circuit. (2) Principle of complete electrical weft detection: The complete detection waveform of complete electrical weft detection is shown in Figure 3-48. ①Weft signal: changed by the front and rear adjustment position of the complete probe (310°~320°). When the completion signal changes greatly, it means that the weft insertion is unstable.
②PS signal: The starting reference position of the PS signal is changed by the PS-D potentiometer. The amplitude of the PS signal is changed by the PS-W potentiometer. ③PS signal: The reference is 290°. When weaving, when the weft wire enters the detection area of the electrical weft detection, the complete source is blocked, so that a “weft wire present” signal is generated in the detection circuit, that is, a PS signal; if there is no weft wire and the complete source is not blocked, a “weft wire present” signal is generated in the detection circuit. “No weft” signal, that is, no PS signal output, and after comparing with the PS signal, a weft missing stop signal is sent.
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