light industry

In the electrical machinery manufacturing industry, metal strip reeling equipment as the basic equipments used quite extensively. Metal strip reeling is to ensure that the important process of the product quality and the appearance of the finished, reeling equipment required to maintain the stability of the tension cable in the process. The traditional DC motor + EUROTHERM 590 controller constant tension control scheme for the existence of maintenance cost and high control precision. With the improvement of the function of the frequency converter and the control of the induction motor, the advantages of frequency converter in constant tension control are more and more obvious, which is the basic automatic control technology of constant tension control technology. The use of ECF100 - S type chuangfei David inverter can achieve a high level of accuracy.
2 inverter constant tension control system
2.1 principles of process automation design
Picture 1000MM stretching bending straightening unit, constant tension control is the basic automation of process stability.

The system structure diagram is shown in Figure 2, which is composed of three parts: the unwinding mechanism, the tension regulating mechanism, and the winding mechanism. The entire device is controlled by the MITSUBISHI FX2N series PLC, and the process parameters are set by the WEINVEW touch screen.
ECF special inverter ECF100 - s to replace 590 series DC speed regulator do put volume control the use of the design, so that in addition to save DC motor of high maintenance cost, also can improve the wire speed (DC speed control for passive unwinding, the linear speed of 18m / S; changed to frequency converter do active unwinding, the linear speed of 25m / s), so as to improve the work efficiency.
When the line speed up to the highest 25m/s, the maximum frequency of the roll up converter needs to work to 99Hz; the acceleration time is 30s,
Due to the ECF100 series inverter with reeling dedicated control function, do not need to rely on PLC to complete the constant tension control, with automatic coil diameter calculation, and the PID automatic adjusting function, so this system can independently complete the control of roll motion, replace the DC speed control.
2.2 based on a tension control of inverter fly Yi
The design of tension control system of inverter based on the fly. With reeling dedicated control functional inverter accept tension sensor tension input signal, after the inverter internal preset tension balance parameter ratio calculation, the error of the tension to make independent tension real-time control of the speed of roll.

3, quotation
In order to ensure the stability of the system. The inverter used to be higher than the original motor with a power rating.

名称	型号	单位	数量	金额	合计	备注
变频器	ECF100-S-45KW	台	1
变频器	ECF100-S-55KW	台	1
变频器	ECF100-T3-75KW	台	1
变频器	ECF100-T3-93KW	台	1
机柜	800*600*1800	MM	2
操作台	800*400*1200	MM	1
触摸屏	5．7寸	台	1
可编程控制器	FX2N—48MR	台	1
线材		批	1
空气开关		台	4
接触器		台	4
辅材		批
调试费
总计金额：(元)

Note: this price is the preliminary budget price. Settlement is based on the actual configuration.