1.Summarize

The wire and cable industry is currently moving towards more technological levels such as product diversification and automation. Power wire laying racks are very commonly used in the wire and cable industry. Power wire laying racks can be divided into vertical wire laying racks and horizontal wire laying racks according to their styles. Both are wire laying devices, but their structures are different. In the wire laying process, the frequency converter has become an indispensable device. The frequency converter can control the motor to achieve the speed of wire laying, thereby improving the production efficiency of the process level, ensuring the process quality, and achieving the maximization of profits.

2. The composition and working principle of the complete set of power cable laying frame equipment.

The power wire release machine releases two wires (or more wires). The wire release passes through the balance bar machine, and the position of the balance bar is judged to determine whether the wire release machine rotates forward, backward or stops at zero point. The wires after passing through the balance bar finally enter the stranding machine, where the two wires (or more wires) are twisted together, ultimately achieving the generation of the product. For instance, the commonly used network cables can be produced through power cable laying frames.

3. The functions realized by the power cable laying frame equipment.

The entire set of power cable laying frame equipment should achieve the following: when starting to find, the feedback rod can quickly and accurately locate the zero point. Stable wire laying of the power wire laying frame during operation; It can accurately ensure the tension of the wire when the machine stops. The following are the requirements for the power layout frame of a certain machinery factory:

(1) When the pendulum rod is in the middle, the motor stops (commonly known as: zero position).

(2) Below the pendulum rod, the motor rotates in reverse, and the maximum frequency does not exceed 5HZ.

(3) When the pendulum is at the top, the motor rotates forward with a maximum frequency of 30HZ, and the response time should be fast.

(4) When the pendulum rod is moving up or down, it must not touch the limit point.

(5) When automatically finding the zero point, the swing amplitude should not be too large to quickly and accurately locate the zero point.

(6) When the machine stops, the wire will not loosen and will remain taut.

4. The application of FD500 Low-voltage Frequency Converter on Power Line Laying Frame.

To achieve the above functions of the power cable laying frame, the PID function of the FGI FD500 series low voltage frequency converter can be used. First, find the zero point of the feedback rod (in the middle of the physical position, at this time the PID input can be set to 50%), connect the feedback rod to the feedback of the PID, and achieve forward and reverse rotation by offsetting the zero point of the feedback rod. To achieve other functions, PID-related parameters (such as PID gain, PID feedback, etc.) can be adjusted.

5.Sum Up

The power laying frame is equipped with the PID control function of the frequency converter. Previously, the FD500M frequency converter dedicated machine was used on the power laying frame, which could meet the requirements of power laying. However, the FD500 low voltage frequency converter has better control performance on the power laying frame because our company has optimized the PID control algorithm on the FD500 low voltage frequency converter. This enables the PID control to have good performance, high precision and fast dynamic response, thereby enabling process control and ensuring the reliability of process control.