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Dorna Servos, Servo Drive, Servo Motor on Sleeve Labeling Machines

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Basic Info

Product Description

Model NO.

servo motor and drive

Starting Mode

Variable Frequency Starting

Certification

ISO9001, Ce

Brand

Dorna

Trademark

DORNA

Transport Package

Oversea Package

Specification

0.2-7.5kw

Origin

China

HS Code

8504409999

Abstract: This paper describes application of Dorna EPS series servo system on sleeve Labeling machines based on analysis of working principle of sleeve Labeling machines. Settings of critical of parameters of servo drives are also given.

1. Introduction
Sleeve labeling machine is to put sleeve labels of color-print trademark films on bottled FMCG, including bottled beverages, cosmetics, pharmaceuticals, health products and so on. Sleeve labeling speed decides packaging equipment effectiveness. For example, in fruit juice production lines, the current 400 bottles / min sleeve labeling speed is difficult to meet production needs and sets of sleeve Labelinging is becoming a capacity bottleneck for high-end users. More and more manufacturers want to get profit by increasing sleeve labeling speed.

2. Composition of a sleeve labeling machine
A sleeve labeling machine includes PLC, HMI, servo system and other components.
Better responsiveness of PLC and servo brings higher production efficiency. PLC needs to have multiple groups of 200 KHz or above pulse output channels and input channels. Meanwhile basic instruction execution time needs to be short. Pulse modulation curve (deceleration curve between maximum operating frequency and minimum operating frequency) should be smooth. Also acceleration and deceleration should be fast. Servo motors receive PLC pulse commands then feed labels and cut labels. The appearance of a sleeve labeling machine is shown in Figure 1.

Figure 1 Appearance of a sleeve labeling machine
3. Description of working principle of sleeve labeling machines
Coiled labeling material is used for feeding. When sensors detect bottles, label feeding motor begins to operate and will stop after finishing label feeding. Then label cutting motor starts. When bottle pushing electric eye detects bottles coming, bottle screw will push bottles and array bottles in equidistance and equal initial velocity. Trapping labeling electric eye senses bottle coming and immediately transfer the information to PLC. PLC in turn, continuously issues four directives: label feeding, positioning, label cutting and label-shooting. When label-shooting ends, sleeve labeling process is complete and system enters label finishing & contraction section.
4. Dorna servo parameter settings
Label feeding and cutting requires frequent starting and stopping of motors and have high requirements for servo motor responsiveness and brakes. On condition of no shocking, increase position loop, velocity loop and electric current loop gain parameters. Set servo control, gear ratio and other parameters, and then reciprocate test. If the positioning accuracy and speed meet the requirements, commissioning is complete; If not, then increase the speed loop gain, at this time if the motor is stopped or overshoot or jitter, or the motor has noise, then means loop control parameters are too strong, then decrease appropriate or increase the integration time constant until the position and speed accuracy meet the requirements, then the position loop and speed loop proportional and integral time constant are the appropriate values.
Parameter settings for Dorna servo control system used on a certain Jiangsu sleeve labeling machine are given below.

PA4=0 (control mode selection, 0: position control);
PA9=5 (motor model selection, varying depending on motors);
PA11=3000 (position loop gain, range 500-8000);
PA14=1500 (velocity loop gain, range 500-8000);
PA15=5000 (velocity loop integral time constant, range 500-8000);
PA31=5(input instruction pulse multiplication numerator);
PA32=1(input instruction pulse multiplication denominator);
PA38=1500 (current loop gain, range 500-8000);

Note: electronic gear ratio=PA31/PA32==Ppulse / P
Where Ppulse: Number of pulses per revolution of the motor, i.e. number of pulses from motor feedback components for each revolution of the motor (pulse/revolution). For a 2500-wire increment encoder, the number of feedback pulses to the driver is 2500×4=10000;
P: Number of instruction pulses that need to be received by the servo from the host computer to enable one revolution of the motor (pulse/revolution);
5. Notes for commissioning
To ensure reliable, stable, and correct operation of the servo driver, pay attention to the following matters during installation, commissioning, and use of the servo system:
1) Correct wiring: Dorna servo is designed with standard encoder wires and motor power wires. However, during wiring, always make sure to correct the signal wires between the servo driver and the controller, otherwise the servo will not function normally;
2) Set correct servo control mode: As each type of machine has different applications, correct setting of servo control mode is the precondition for normal operation of the servo;
3) Match gain parameters correctly depending on actual operation results. Besides, Dorna servo should not set electronic position loop and gear ratio parameters in servo enabling mode or during operation of the motor;
4) Ensure proper grounding of the motor. Connect the driver to equipment enclosure to avoid disturbance and leakage current.
5) Signal wires should adopt shielded twisted pairs as much as possible. The shield layer is typically connected to terminal shell;
6) Pay attention to interference issues to prevent the encoder signals and control signals from being disturbed. Encoder wires and signal wires should not be tied together with motor lines and power supply lines or run in the same cable tray with them. They should be routed at a certain distance.
6. Conclusion
This sleeve labeling machine achieves highest customer satisfaction by taking advantage of features of Dorna EPS series including rapid response, precise positioning, short setting time, and stable operation. This equipment makes a full exhibition of benefits of Dorna servos, which helps improve competitive ability of sleeve labeling machines.