HIMA Z7136控制模块工控卡件现货

类目：HIMA
型号：Z7136
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
HIMA Z7136控制模块工控卡件现货

一次线路图1(单台变频驱动) 由于一套装置中采用了较多的变频器，因此变频器产生的谐波问题就比较突出。为此在变频器输入侧和输出侧均安装了交流电抗器。输入电抗器主要起抑制谐波对电网的污染并有效地改善功率因数的作用。输出侧电抗器则主要起抑制高次谐波的作用。变频器输出电压中包含的高次谐波有两个不利的影响:一是干扰弱点控制系统，二是在较长的电缆中产生漏电流，这个漏电流有时足以使变频器无法运行。在没有输出滤波电抗器情况下，电机与变频器之间的大允许导线长度在100m左右，而使用输出滤波电抗器时这个长度可以达到600~800m。由于聚酯生产装置往往比较庞大，电机与变频器之间的距离都比较远，所以为了保险起见需加装电抗器。另外，输出电抗器对保护电机绝缘也有好处。转贴于中国论文下载中心 http://www.s上述一次线路构成使用于浆料输送泵、预聚物输送泵、熔体输送泵、消光剂输送泵、预聚反应器搅拌器电机等的变频驱动。对于后缩聚反应器搅拌器出/入口电机的变频驱动来说，由于电机无法备用设备，为了提高可靠性，采用两套变频器互为备用的方式，其一次线路图如图2所示。
5 控制方案
(1) 变频器运行/停止控制
图2 一次线路图2(变频器互为备用) 聚酯生产过程是由一套DCS系统来控制的，因此对于不同传动部位的运行/停止控制是由DCS系统来监控的。另外在传动部位现场设置有起/停操作柱，可以现场起停变频装置。为了保证在电网瞬停故障情况下变频器的正常操作，变频器起停信号保持电源由UPS提供。另外，为了延长变频器主要元件的使用寿命，变频器不运行时其输入侧接触器时断开的，即变频器在接收到运行指令后才启动输入接触器。 (2) 频率设定(转速设定)信号的给定 DCS操作人员根据生产需要，在DCS操作室给出频率(转速)设定值(DC4~20mA)，该给定值经装置于变频柜内的信号隔离变换器转变为DC0~10V信号并送入变频器。 (3) 变频器运行状态的监视变频器的运行状态包括开关量和模拟量两种，开关量有:变频器运行(RUN)、故障(FAULT)等;模拟量有:变频器运行频率、电机电流、电机转矩等。开关量以干接点的形式送往DCS，模拟量则经信号隔离变换器转变为4~20mADC标准信号送给DCS系统。如图3所示。
图3 变频器运行状态监视示意图 (4) 变频器备用的控制对于后缩聚反应器搅拌器电机，由于有2台变频器需要控制，并且要求在一台变频器运行中发生故障时能迅速切换到另一台备用变频器继续运行，涉及的控制比较复杂，为此设置一套
PLC
系统来承担控制任务。PLC实时监测两台变频器的状况，在运行变频器出故障时，根据预设的控制程序自动启动备用变频器，同时切换相应的开关量和模拟量。为了保证PLC故障情况下能起用变频器，另设置应急开关一套，此开关允许启动主机或备机，但不具备自动切换功能。
6 结束语
上述聚酯装置变频调速系统已先后在辽化聚酯厂、浙化聚酯装置中成功应用，运行情况良好。完全满足生产工艺的要求。与成套引进的系统相比较，具有如下明显优点:(1)造价大为降低。成套引进同类设备的价格在我们自行设计制造设备价格的2~5倍左右;(2)可维护性大大提高。成套引进的设备往往备件价格极其昂贵，售后服务费用很高，而且很难及时周到。由于我们选用的变频器及其外围元件均是国内市场上很容易采购到的，因而可大大降低运行维护费用。 Se cigarette part and max filter assembly. Its control system is composed of several small control systems that are independent and related to each other. Its functions are relatively concentrated. Figure 1.1 shows the distribution diagram of its control system (top view). As can be seen from the figure, the original control system is embedded in the whole production line and distributed around the production line, which is convenient for inspection and maintenance. The interconnection between each part of the control system is routed from the inside of the machine; Many sensors and actuators are irregularly distributed in all parts of the whole production line. There are air switches, contactors, circuit breakers and relays inside each control cabinet (except the cabinet where the electronic control card is placed). Most of the relays are used to realize simple logic functions (such as interlocking, interlocking, etc.). Only a few relays are reserved in the new design. The control logic is realized by PLC. The extra space after removing the relay is used as the sub site for PLC, PLC sub station mainly includes communication module, input and output module and special function module. The original control system is embedded into the machine, and each cabinet has been treated with corresponding ventilation and dust prevention. However, with the passage of time, the dust in the cabinet is still accumulating more and more, the temperature in the cabinet is always maintained at a relatively high level, and the circuit board in the control system is not specially protected. The circuit board works in a high temperature and dusty environment all year round, which accelerates the aging of electronic components and reduces the stability of the whole control system. When using PLC control system, we remove the electronic control card of the original control system, and its function is realized by PLC. The central processor of PLC is placed in a newly added control cabinet, which is conducive to the improvement of the stability of the control system. The original control system mainly adopts three power supply modes: 1. The main power supply adopts TN-S three-phase five wire AC power distribution: transformer and main power supply

electric machinery

, fan, oil pump, paper tray rotation motor, etc. provide electric energy; 2. Single phase AC power

RELIANCE

ABB

GE

FOXBORO

EMERSON艾默生

A-B

MOTOROLA

TRICONEX

HONEYWELL霍尼韦尔

HIMA

140系列PLC

BENTLY本特利

其他

SST

EPRO

YOKOGAWA

MOOG

NI

WOODWARD伍德沃德

METSO

KOLLMORGEN科尔摩根

力士乐

ALSTOM阿尔斯通

YASKAWA安川

AMAT

ICS TRIPLEX

新能源系列

EATON

HIMA Z7136控制模块工控卡件现货

扫一扫关注微信