Application of DZB300 inverter in industrial washing machine

Introduction

In recent years, industrial washing equipment especially water washing equipment mainly, and the application of inverter is more and more popular, and thus brings a new technological revolution to the industrial washing equipment, from the earliest non adjustable semi-automatic washing machine to the full-automatic washing machine with two two speed motors to achieve four speeds, and finally to the modern washing machine with only one motor to achieve multi speed.

Composition and working principle of automatic industrial washing machine:

The full-automatic industrial washing machine is a large capacity washing machine with functions of initial washing, washing, rinsing, bleaching and dehydration, which can realize automatic conversion without manual operation. According to different ways of vibration reduction and vibration avoidance, the washing machine can be divided into three types: suspension vibration avoidance type, water injection balanced vibration avoidance type and gravity fixed type, at present, the mainstream products in the market are all the full-automatic industrial washing machines with suspension and vibration avoidance. It is mainly composed of shell, frame panel, main shaft inner drum, transmission system, vibration avoidance system, front door component, feeding component, braking component, water discharge valve component, over vibration component, control component, pipeline component and pneumatic system.

The working principle of the full-automatic industrial washing machine is that under the unified scheduling and management of the time sequence controller, the asynchronous motor is controlled by the frequency converter to continuously perform the positive and negative rotation to realize the asynchronous movement of water and clothing, so as to make the water and clothing rub each other and achieve the purpose of cleaning. It mainly includes the following washing procedures:

lTransmission system of automatic industrial washing machine:

The transmission system is an extremely important part of the industrial washing machine, because it mainly provides power support for the washing machine and participates in the whole washing process. The transmission system is composed of motor and various variable speed mechanisms, the inverter is mainly used now, so its components are greatly simplified, it is composed of inverter, frequency conversion motor, pulley and drive belt generally. In the whole washing stage, the constant torque speed change (stepless speed change) without impact and intermediate transition (gearbox, speed change device or coupling, clutch, etc.) is realized with the frequency automatic adjustment of the frequency converter, so that the energy consumption in the washing process is significantly reduced.

Industrial washing machine requires inverter to provide high torque, multi speed, wide voltage range, automatic slip compensation and convenient communication mode; Stable performance, can adapt to a variety of hotels, hotel laundry high temperature, high humidity environment; It is required that the inverter can meet the specific washing process requirements of industrial washing machines and the service requirements of specific customer groups.

Fuling DZB300 industrial washing machine special frequency converter adopts scientific custom V / F curve, which makes the washing machine start smoothly, start current small, low speed torque large and other characteristics, stable operation in the use process of customers, and is favored by customers.

lElectrical wiring diagram of transmission system and parameter setting of frequency converter:

The power supply of industrial washing machine is mainly three-phase 380AC, and the electrical and control system wiring is as follows:

The main functional parameters of the inverter of the full-automatic industrial washing machine are set as follows: In the above figure, S1 / DCM and S2 / DCM are the start stop and positive / reverse switching terminals of inverter respectively, when only S1 and DCM are closed, the inverter will run forward; when only S2 and DCM are closed, the inverter will run in reverse. If S1 and S2 are disconnected or closed with DCM at the same time, the inverter is in shutdown state.

Terminals S3-S6 are digital signal ports, and their common terminals are all DCM, that is to say, they are effectively when closed and connected with DCM. Among them, terminals S3, S4 and S5 are multi-stage speed terminals of the inverter, which can correspond to the three washing procedures of the industrial washing machine, namely, uniform, medium and high separation. The X6 terminal is defined as the acceleration and deceleration time selection terminal, which can conveniently select four different acceleration and deceleration times defined by the inverter, in order to scientifically and effectively determine the different washing procedures of industrial washing machine, it has the best acceleration and deceleration time, so as to achieve the best washing effect and significantly reduce the mechanical impact, so that the washing machine always works in the optimal state.

R. S, T are three-phase input, U, V, W are three-phase output of inverter. A/B are relay output terminal of inverter. According to the actual electrical design and control needs, customers can easily choose the normally closed or normally open port as the alarm output.

S. Br +, Br - are the external braking resistance ports of the inverter, which are used to install the braking resistance of each power level matching the power level of the inverter.

The main functional parameters of the inverter of the full-automatic industrial washing machine are set as follows:

Note: 1. The corresponding and frequency settings of multi-segment speed and washing program can be modified according to the actual functional requirements.

2.The set 4 specific acceleration and deceleration times can also be modified according to the actual function matching requirements.

Notes: The definition of V / F curve is the most critical step in the application and debugging of industrial washing machine inverter. During the debugging process, continuous optimization must be carried out according to the site working conditions, mainly mastering the following principles:

◆The industrial washing machine starts slowly and steadily, and the low frequency starting torque of the inverter is large.

◆Pay attention to the slope of V / F curve. If the slope of each set point of V / F curve is too large, the operation current will be too large, and if the slope is too small, the operation cannot be started. Therefore, it is necessary to comprehensively grasp the motor and its site conditions.

Attachment: due to the special process requirements of the full-automatic industrial washing machine, when selecting the inverter, it is generally based on the rated power of the motor equipped with the washing machine, amplifying one level of the power to equip the inverter.