Support facilities include the following system of paper machine: for slurry systems, water systems, vacuum systems, compressed air systems, chemical production and transmission systems, water supply systems, steam systems, and so on. In order to makes running papermaking machine continuous balanced, its auxiliary facilities should generally exceed the maximum production capacity of paper machine 15%~30%. The application has not been enough attention, but also improve the inverter share the most effective means and methods.

1  pulp system of frequency Manager application for pulp system must meet following several conditions:

(1) to paper machine conveying of slurry to stability, errors cannot over ± 5%;

(2) slurry of ratio and concentration to stability uniform;

(3) reserve must of slurry volume, makes for pulp capacity can regulation, to adaptation paper machine speed and varieties of change;

(4) on slurry for purification featured;

(5) processing paper machine the part loss paper.

Typically, pipeline pump for slurry system for pulp, pulp pumps and purification facilities consisting of pressure screen, cleaner, to reach five points above aim, the most important was to pulp and Red pulp pumps from running full speed into variable frequency and adjustable speed, eventually meets pulp supply automation. Pulp pumps as an example to illustrate the frequency inverter speed control processes: the frequency conversion control in double closed-loop speed control system is preferable, and the outer ring is the speed closed loop, the inner ring is a current or closed-loop torque. Pulp charging pump by speed setting values are obtained from pulp speed and speed changes and, on the other hand is from the Headbox pressure controller. Which is the melody, which is fine-tuned. Pulp in paper machine speed and speed is basically constant, paper machine speed once, pulp charging pump speed to follow changes in order to improve the accuracy of the speed controller and reflect the actual processes of Headbox, usually also take Headbox pressure PID control output value ± 5% changes to speed the pulp charging pump by attaching the set value. Actual value is taken from the actual speed of the drive motor speed sampling, by rotating the speed detection device of electric or photoelectric rotary encoder and other access. Current set value is taken from the velocity loop output signal current actual value is taken from the driving point of AC inverter output current transformer measurements. Pulp pump variable frequency speed regulation, therefore, PID needs to be controlled, proper selection of the speed you want feedback and PID parameters. Aware of this, is very important to select the inverter model.