Application

2016-09-13

A washing equipment Co., Ltd. is specialized in industrial washing machine production and R & D enterprises. For the hospital, chemical, petrochemical, hotel and various production enterprises to provide a variety of automatic washing equipment specifications. Its products are semi / washing machine, full automatic centrifugal semi automatic horizontal drum industrial washing machine, full automatic washing machine more than thirty kinds of crystalline material products. The products are widely used in hospitals, hotels and large enterprises. In recent years, under the influence of the promotion of full automatic washing machine, large industrial washing machine also entered the era of automatic control from the original relay control mode.

Technological process

The whole washing process is divided into four parts: water, washing, water, dehydration, the system from the beginning of the water into the dehydration section of the end of a total of three cycles.

A. system is running three cycles: the first cycle started washing drum water to the water; start washing three times second, the highest water level of drum.

B. washing method is divided into light wash, standard wash, strong wash (according to the positive, stop, reverse, stop the four steps of the cycle to the time of arrival)

C. at the frequency of 20-80HZ link operation such as dehydration drum vibration, the inverter output to stop after stop drum from 20HZ to dehydration.

Control requirements and functions

A. washing equipment should have the time to stop the water function (that is, when the washing water into the water level or high water level began to wash but not close the inlet valve until the delay time to stop the water

B. system with stop and emergency stop function (that is, when the system stops pressing the stop button to stop all operations, and then start again from the first link. Press the emergency stop button when the system stops running, emergency stop reset system from the emergency department to continue to run

The start, stop, stop operation and parameter setting of C. washing equipment are completed by man-machine interface.

The D. system uses a simple PLC converter functions to complete the multi speed curve of washing machine dehydration process (first stage 20HZ / 20 seconds; second 50HZ/15 seconds; third 80HZ/15 seconds; fourth 100HZ/10 seconds; fifth 130HZ/10 seconds)

E. washing frequency plus / deceleration rate of 2HZ/ seconds, dehydration frequency acceleration rate of 0.5HZ/ seconds, deceleration rate of 1.5HZ/ seconds.

F. in the dehydration process such as vibration mechanical vibration is greater than the design requirements, the system should immediately stop the inverter output until the drum stop and re start from the first phase of dehydration (by vibration switch signal).

G. converter in the simple PLC one to five phase of the operation frequency and run time by the programmable logic controller through communication settings.

System control principle

Industrial washing machine system by programmable controller, inverter, touch screen control components and other components, the programmable controller to complete the whole system logic control and transmission of various operating parameters to read and write, the equipment running status display function. The frequency converter and programmable logic controller use the free port communication protocol communication to complete the start / stop of the equipment, the implementation of the simple PLC program and other related operating parameters. PLC and touch screen communication to achieve man-machine dialogue, complete the relevant parameter settings, start stop operation and status display.

Scheme implementation

Touch screen：

Industrial washing machine manufacturers based on the parameter picture related parameters, operation frequency and running time of curing equipment washing time, washing frequency, frequency, automatic manual dehydration dehydration simple PLC to the programmable controller, the operation frequency and operation time and other parameters to the inverter is transmitted by MODBUS communication protocol. The operation screen is provided with the start / stop of the device, the running time and the running state display.

Programmable logic controller:

The programmable controller in the preparation of the host band frequency is changed, the host with frequency inversion subroutine for washing link call setting subroutine five run time compilation stage to stage five, stage one to set the operating frequency of the stage for manufacturers to modify the parameters of simple inverter in PLC program.

Frequency converter:

1) given the frequency of a given channel and the command channel are given the choice of serial port; the host of the operating frequency and operating instructions from the PLC by the way of communication to the inverter.

2) the upper limit frequency and the operating frequency is set to 130HZ.

3) 1 acceleration time and deceleration time of 1 (washing link acceleration / deceleration rate 2HZ/ seconds) for 65 seconds, the acceleration time and deceleration time (2 to 2 rate of 0.5HZ/ seconds, the dehydration step deceleration rate 1.5HZ/ seconds) was set to 260 seconds and 80 seconds.

4 (V1) the voltage value of the V/F curve is set to 35%, the frequency value is set to 20HZ or the motor will not start because of the low starting torque;

5) X1, X2 terminal set for the selection of the plus / deceleration time 2 function, the system runs in the dehydration process (X2 is high) addition / subtraction speed time 2 effective, frequency converter plus and minus the time of 2 to add / decelerate.

6) the X3 terminal is set as an external shutdown command function, when the PLC gives a stop command or the vibration is too large (X3 is high) the inverter stops the output.

7 (X4) set to simple PLC program failure function; the system running in the water and washing links (X4 is high) simple PLC program can not run.

8) X5 set to a simple PLC program pause function; system running in the dehydration process, such as pressing the emergency stop button (X5 is high) simple PLC program will be suspended. Emergency stop and then continue to run from the suspension.

System control:

Parameter setting

A. to enter the parameters of the manufacturers to set the washing frequency, washing equipment time, delay time to stop the water.

B. enters the dehydration parameter picture to set the stage to the stage five the operating frequency and the running time.

manual control

According to the water, washing, drainage, removal, removal of low, high order of equipment independently start and stop operation, operation