VE4002S1T2B2自动化工控卡件

类目：EMERSON艾默生
型号：VE4002S1T2B2
全国服务热线：+86 15270269218
手机：+86 15270269218
微信：+86 15270269218
QQ：3136378118
Email：stodcdcs@gmail.com

在线咨询

产品详情

瑞昌明盛进出口贸易有限公司
主营DCS控制系统备件，PLC系统备件及机器人系统备件，
优势品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各种进口工业零部件
VE4002S1T2B2自动化工控卡件

PLC——变频器对电机的启动、停止、点动功能采用通讯控制方式，使用双绞线通过RS485口来实现PLC对变频器的启停控制，这样极少占用PLC的输出点，也无需用接触器控制，降低了机床的成本。EV1000的RS485口直接端子连接，极为方便。但需要注意的是RS485口“+”，“—”极性不能接反，否则将无动作。因变频器本身具备过电流，过电压，欠电压，接地，过热和过载等多项保护功能，一旦异常故障发生，常开点RA，RC闭合，变频器立即停止输出，将断开所有的动作并停车报警，我们将其接入PLC的输入点来控制。变频器故障时可查看变频器屏幕上显示内容，对照变频器使用说明书异常原因及处置方法，采用相对应的措施进行处理即可。变频器多项对输出的保护功能使我们无须对电动机另加保护环节，直接接于变频器的输出端子上即可。针对变频器的输入端保护相对较为薄弱，在输入端加上无熔丝断路器QF实现反时限热保护。
图1 电气原理
图1 电气原理

通讯协议采用MODBUS模式，EVFWD为正转，１为COM1通道(EC10只支持通道1)，１为通讯地址，其值必须预先设定，与变频器通讯地址一致，且不可覆盖。EVREV为反转指令，EVDFWD为正向点动指令，EVSTOP为停止指令。
5 结束语该系统应用变频器调速实现无级调速，满足用户工艺多样化的需求。使用RS485通讯口，不占用PLC的输出点，接线少，提高了产品的可靠性。所选艾默生CT变频器具有较强的自诊断功能，便于维护。该系统自投入使用以来，运行稳定，工作可靠，尚未出现故障，具有很高的性价比。金属材料领域的60～70%是板材，金属板材的大部分是经过冲压加工制成成品。冲压加工在国民经济各个领域应用范围相当广泛。例如，在宇航，航空，军工，机械，农机，电子，信息，铁道，邮电，交通，化工，医疗器具，日用电器及轻工等部门里都有冲压加工。汽车的车身、底盘、油箱、散热器片，锅炉的汽包、容器的壳体、电机、电器的铁芯硅钢片等都是冲压加工的。仪器仪表、家用电器、自行车、办公机械、生活器皿和制品等产品中大量冲压件。冲压按工艺分类，可分为分离工序和成形工序两大类。冲压分离工序也称冲裁，其目的是使冲压件沿一定轮廓线从板料上分离，同时保证分离断面的质量要求。
冲压分离工序使用冲床加工实现。冲裁加工在室温下利用安装在压力机上的模具对材料施加压力，使其产生分离变形从而获得所需零件的压力加工方法。冲压设备除了厚板用水压机成形外，一般都采用机械压力机。冲压件具有薄、匀、轻、强的特点。由于采用精密模具，工件精度可达微米级，且重复精度高、规格一致，可以冲压出孔窝、凸台等。冷冲压件一般不再经切削加工，或仅需要少量的切削加工。.and flexibility of the system. 3) The CAN bus is connected with the physical bus through the two output terminals canh and canl of the CAN controller interface chipThe state of canh end can only be high-level or suspended state, and canl end can only be low-level or suspended state. This ensures that there will be no phenomenon similar to that when the system has errors in RS-485 network, multiple nodes will send data to the bus at the same time, resulting in short circuit of the bus and damaging some nodes. Moreover, the CAN node has the function of automatically closing the output in case of serious errors, so that the operation of other nodes on the bus will not be affected, so as to ensure that it will not appear in the network. Due to the problems of individual nodes, the bus is in a "deadlock" state. 4) The perfect communication protocol of can can can be realized by CAN controller chip and its interface chip, which greatly reduces the difficulty of user system development and shortens the development cycle, which can not be compared with RS-485 with only electrical protocol. 5) Compared with other field buses, the maximum communication rate of CAN bus can reach 1Mbps. When the transmission rate is 5Kbps, twisted pair is adopted, the transmission distance can reach 10km, and the reliability of data transmission is high; Can bus is an international standard Fieldbus with many characteristics such as high communication rate, easy implementation and high cost performance. These are also the important reasons why can bus is applied in many fields and has strong market competitiveness. Difference between CAN bus and RS485 mode: can bus system structure: each node of CAN bus needs to be equipped with CAN protocol control chip and appropriate interface circuit. The bus connection between nodes is carried out through twisted pair shielded