Introduction to servo control of self-adhesive printing press
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Self-adhesive printing machine drive is divided into two parts: paper drive (servo control) and printing paper up and down movement (inverter + cam control); printing paper continues to run at the set frequency, touching the top in the upward movement of the paper The printing template completes one printing, and after the printing is completed, a signal is output through the proximity switch to the servo controller to control the servo motor to run a certain distance to prepare for the next printing.
Electrical control principle: HMI + PLC + SERVO users pass the HMI setting parameters to the servo controller via PLC Modbus communication.
All functions and parameters of this press are set and changed through the man-machine interface
a) Manual paper pull function
Note: Press the ESC button on the panel to perform the manual paper pull function on this page. It is invalid under other pages.
Implementation method: In this state, a manual forward rotation signal (Terminal: 19) is given to the servo controller when an internal relay (%m58) is used to disconnect the PLC output to the servo automatic operation signal (%Q0.7).
b) Pull paper parameter setting page
* Description of operation method:
Press the up, down, and right buttons on this page to move the cursor to the data to be modified, press ENTER to enter the data to change the state, and use the right button to move the cursor.
To the bit to be changed, use the up/down keys to change the value, change to the desired data, press ENTER twice to complete the change, and finally press the ALARM key to save the parameter.
* Pull length setting: 0-99999 Unit is 0.01mm, for example 22222 stands for 222.22mm
Fine adjustment: the unit is 1 pulse (the smallest unit of motor rotation) + is increased, - is reduced
1 pulse is about 0.005mm
Actual: shows the number of pulses actually input to the drive
* Pulling speed: set the motor speed in revolutions per minute
*Implementation method: Since the unit set on the man-machine interface is mm, and the unit inside the servo controller is Pulse, it is necessary to convert mm to Pulse.
The formula is as follows:
Pulse:=16384(Resolution)*10(Gear ration)/3.1415926(∏pai)/150(Diameter)
All conversions are implemented inside the PLC and the speed unit is transferred directly to the servo controller in RPM (rev/min).
* After the setting is completed, the two parameters are transmitted to the servo controller's Dataset via the Modbus bus through the rising and falling edges of ENTER.
Position and Speed data areas. Refer to the comments in the PLC program for the specific PLC implementation method.
Acceleration curve selection
Speed
Location
Number of printed sheets
*Number of printed sheets (%MD130: readable and writable): Calculate the number of prints in the count state. It can be modified as needed.
Implementation method: When the printing machine completes one printing, and the system user selects the counting state, a signal is given by the proximity switch (%I0.0) and the counter in the PLC is incremented by 1.
* Set the number of printed sheets (%MD126): Set the predetermined number of printed sheets. When the number of printed sheets is greater than or equal to the set value, the device automatically stops.
Implementation method: When the system is in the counting state, the current printing technology value (%MD130) will be compared with the set value (%MD126). If the current printing quantity reaches the predetermined quantity, the PLC outputs a signal (%Q0.3). The system stops. All functions are specifically referred to the PLC program and comments through the PLC.
*Total: The total number of printed sheets contains the count when the device is in a non-printing state.
* Use the ALARM button on the panel to switch whether the device is in the count state (%M31)
*One/two degree printing conversion
When the type of color required for printing is greater than the maximum color type that can be printed at a time, the printed object will be printed a second time. This printing is a second printing, and the first printing is a one-time printing. If the printing is not good, the second printing will be even worse.
*Two-degree printing implementation:
In the first printing, a color mark is placed on the object to be printed as a position reference for the second degree printing. * When the system status is switched from one-time printing to two-degree printing, the servo motor first runs the PTP command of this distance, and determines the position of the next PTP by calculating the position between each color mark to eliminate the accumulated error.
* Use the ALARM button on the panel to convert the one/two degree print status (%M33%). The electric eye will automatically energize during the second printing (%Q0.5).
* In the second printing state, please perform manual operation of the printer to trigger the servo motor to automatically find the color code. If the motor does not find the color code signal within 3 seconds, it will stop automatically.
* Acceleration and deceleration settings page
When the user's printing times (%MD148) reaches the PLC preset number (10000000), an internal bit (%M65) will be output. The starting page is displayed, asking the customer to enter "9999" on the page and the device stops running. When the user enters the correct data, the device re-runs automatically. The user must enter the correct password to write data.
Others: After turning on the power switch, the seven-segment display code on the servo drive will be displayed as 4. After starting the press inverter, the servo drive will enter the enable state (with current injection motor), and the seven-segment display code on the servo drive will be displayed as 6 . The servo motor will perform the corresponding action after the camshaft sensor receives the signal.