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  • Home > Industry application > Application in CNC milling machine with PS7800 cabinet inverter
    2018-03
    26
    Application in CNC milling machine with PS7800 cabinet inverter
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    1. Overview of the industry

    Milling machine is a kind of widely used machine tools, milling cutter in the processing of machine tools on the surface of the workpiece. Usually cutter rotating movement is given priority to, (and) the movement of the cutter for the workpiece feeding movement, milling machine can processing plane (horizontal plane, vertical plane), trench (key, T slot, dovetail groove, etc.), gear parts (gear, spline shaft, wheel, spiral surface (threads, spiral groove), and various surface. In addition, can also be used on the surface of a solid of revolution, the inner hole machining and cutting work. Milling machine at work, the workpiece on the workbench or dividing first-class accessories, cutter rotating movement, accompanied by a table or milling head feed movement, the workpiece can obtain the required processing surface. Because the cutter is discontinuous, and therefore the productivity of milling machine is higher. Simply put, the milling machine is to use cutter to milling the workpiece in the machine. Milling machine is to use cutter to milling the workpiece in the machine. Also can processing complex surface, high efficiency of a planer, widely used in machinery manufacturing and repair department.

     

     

    2. The process characteristics

    (1)  The control system need high response speed, high flexibility, motor can rapid FWD &REV and  Acceleration /deceleration switch running;

    (2)  Cutting guarantee + / - 0.2% accuracy, high stability;

    (3)complex Processing, irregular shape parts requires qualified rate is as high as 98% above;

    (4)It can realize high efficient cutting and high precision; Implementation strong output torque at low speed or high-speed.

    3. The system configuration

    Milling machine is composed of the following system: 1. The main drive system; 2. To the feed system; 3 implementation artifacts turning, positioning equipment and accessories; 4 some parts and auxiliary function of the system and devices, such as hydraulic, pneumatic, lubrication, cooling system, such as chip removal, such as protective devices.

    To realize the feed system, workpiece rotation, positioning, etc., mainly Through servo system implementation.

    Inverter is mainly used in main drive system, control the speed of spindle are given according to the numerical control host system operation, output torque, ensure enough to cutting accuracy and stability.

    4. The system plan selection

    Selection of converter and capacity calculation

    converter type according to the capacity of the ac motor and choose specific working current, normal milling machine in the working process of the converter low frequency torque, smooth output, choose POWTRAN PI9000 inverter, the inverter adopts the advanced vector control without speed sensor, high torque at low speed, stable running, stop speed, quickly torque dynamic response, high steady speed precision, complete strong anti-interference ability function. Used in various industries. Has very stable performance.

    5. POWTRAN PI9000 electrical diagram & field application

     

    6. POWTRAN PI9000 parameter setting

    Function of converter set:

    CNC milling machine system use two channels analog signals control the spindle rotation, analog voltage signal 0 ~ 10 v, or analog 4 ~ 20 ma current signal, speed stability, smooth operation for requirements.

    Thus POWTRAN PI9000 inverter parameter should be set as follows:


     

    Function code

    Function description

    set value

    remarks

    F0.00

    Motor control manner

    0

    Vector control W/O PG

    F0.11

    Command  source selection

    1

    Terminal block control

    F0.03

    Frequency source master setting

    2 (AI1)

    Analog voltage signal (the user can choose their own)

    F0.19

    Maximum output frequency

    100HZ

    Requirements set by the user

    F0.21

    Upper limit frequency

    100HZ

    F0.13

    Acceleration time 1

    5S

    F0.14

    Deceleration time 1

    4S

    F3.08

    Initial frequency of

    stop DC braking

    0.5HZ

    Need to plus braking resistor

    F3.09

    Waiting time of stop

    DC braking

    0

    F3.10

    Stop DC braking

    current

    100

    Need to plus braking resistor

    F3.11

    Stop DC braking

    time

    1

    B0.01

    Rated power

    4KW

     

     

    motor nameplate parameters

    B0.02

    Rated voltage

    380V

    B0.03

    Rated current

    8.5A

    B0.04

    Rated

    frequency

    50HZ

    B0.05

    Rated speed

    1460

    B0.27

    Motor parameter auto

    tunning

    1

    asynchronous motor parameters comprehensive auto tunning

    F4.09

    Slip compensation

    coefficient

    100

    Requirements set by the user

    F5.08

    Upper limit digital setting for lower torque under speed

    control mode

    150

    F1.00

    DI1 terminal function

    selection

    01

    Forward run

    F1.01

    DI2 terminal function

    selection

    02

    Reverse run


    7. POWTRAN P
    I9000 characteristics

    PI9000 inverter used in milling machine has the following features:

    1, high productivity, cutting high accuracy, high stability, high flexible requirements;

    2, well dynamic response, motor spindle high-speed running stable;

    3, constant torque output;

    4, steady speed, high precision, low speed when the rate of change is small.

    8.POWTRAN PI9000 product photograph

     

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