VMIPCI-5565-010

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描述

VMIPCI-5565-010

在电动机控制接线中,主电路中装有熔断器,为什么还要加装热继电器?它们各起何作用,能否互相代替?而在电热及照明线路中,为什么只装熔断器而不装热继电器?
熔断器在电气线路中主要起短路保护和严重过载保护作用,而热继电器主要用于过载保护.两者不能互为代用,但可以互为补充.如果用熔断器作电动机的过载保护,为了防止电动机在启动过程中熔断器熔断,熔断器熔体的额定电流一般应取电动机额定电流的2.5~3倍,这样即使电动机长时间过负荷50%,熔断器也不会熔断,而电动机可能因长时间过负荷而烧坏.所以不能用熔断器作过负载保护.而热继电器是利用电流的热效应来工作的,由于热惯性的影响,尽管发生短路时电流很大,也不可能使热继电器立即动作,这样就延长了短路故障的影响时间,对供电系统及用电设备会造成危害.所以也不能用热继电器作为短路保护.

对于电热及照明设备,由于负载的性质不同于电动机的拖动负载,一般来说,它们不会出现过负载现象,所以,一般不装备热继电器,而只装备熔断器,主要起短路保护作用.

可编程控制器由于抗干扰能力强,可靠性高,编程简单,性能价格比高,在工业控制领域得到越来越广泛应用。工业年月机作为中央控制单元,配有组态软件,选用大屏幕实时监视界面,实现各控制点的动态显示、数据修改、故障诊断、自动报警,还可显示查询历史事件记录,系统各主要部件累计运行时间,各装置工艺流程图,各装置结构图等。中央控制单元和下位机PLC之间采用串行通讯方式进行数据交换,通常距离在1000m以内选用485双绞线通讯方式,较常距离可选用光纤通讯,更长距离也可选用无线通讯方式。下位机选用PLC控制,根据控制对象的多少,控制对象的范围,可选用一台或多台PLC进行控制,PLC之间数据交换是利用内部链接寄存器,实现数据交换和共享。由于PLC对现场进实时监控具有很高的可靠性,且编程简单、灵活,因此越来越受到人们重视。

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保 证 安全准时发货,
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主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA
  专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

National Instruments FP-DI-330 8-Channel Input Module

NATIONAL INSTRUMENTS SCXI-1331 HIGH-VOLT TERMINAL BLOCK

National Instruments 12bit DAQ Control Module SCXI-1200

National Instruments Measurment Studio Manual Powerful

National Instruments NI Double-shielded SHC68-C68-D2

National Instruments NI PCI-6503 (PCI-DIO-24) DAQ Card

National Instruments: PXI-1000B 8-slot 3U PXI Chassis

National Instruments PXI 1000B chassis MXI-3 controller

NATIONAL INSTRUMENTS CB-50LP UNSHIELDED I/O CONNECTOR

NATIONAL INSTRUMENTS SCXI-1000 WITH 4 SCXI-1100

New National Instruments CB-50LP Unshielded I/O Connect

NATIONAL INSTRUMENTS PXI-6031E AND NI- DAQ W/SOFTWARE

NATIONAL INSTRUMENTS NI DEVELOPMENT SUITE AS SHOWN ONLY

National Instruments PCI SERIAL RS-232/485 185729C

National Instruments nuDrive Motion Controller 4-Axis

NATIONAL INSTRUMENTS FP-TB-1 UNIVERSAL TERMINAL BASE

National Instruments. SCXI-1326. Terminal Block.

National Instruments BNC-2090 Data Controller

NATIONAL INSTRUMENTS PC-DI0-96 PCDI096 DAQ BOARD

National Instruments PCI-6503 185183A-01 *NEW*

1910 Ad Christmas Instrument Edison National Phonograph

NATIONAL INSTRUMENTS, SCXI-1162HV, HIGH VOLT DIG INPUT

68 Pin Solderless Breadboard for National Instruments

National Instruments 182419B-05 Cable SH6868 New

National Instruments GPIB-232CV IEEE488-RS232 Converter

NATIONAL INSTRUMENTS FP-1001 RS485 NETWORK MODULE

National Instruments NI PXI-6713 Analog Output PXI 6713

National Instruments 763061-03 GPIB X2 Cable – NEW

National Instruments NI PCMCIA GPIB Cable – 2 Meter

National Instruments FP-TC-120 8-Ch. Thermocouple Input

National Instrument PXI-5620 Frequency Domain Digitizer

National Instruments SCXI-1160 16-Channel Relay Board

National Instruments PCI-232/485, 2CH

National Instruments 777421L-04 Software for WIN NT/98

Field Point National Instruments # FP-A1-100

National instruments Matchmaker PCI RS-232, RS-484 Card

National Instruments. CB-27. Connector Block.

National Instruments 182869A-03 3 ft. SCSI To Parallel

National Instrument NI PCI-232/485 2CH 184686D-01

1.1 Meter National Instruments IEEE Cable 488

National Instrument PCI MIO 16XE-50 DAQ 183454F-01

National Instruments VXIpc-486 Model 566 182429M-20

National Instruments CARD PCI-6503 185183B-01 New

National Instruments NI-DAQ Data Aquisition Driver CD

National Instruments NI PCI-6528 Digital I/O 24 in/out

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National Instruments PXI-8146RT system controller *wty

National Instruments SCXI-1302 REV:3.0, P/N 185163A-01

NATIONAL INSTRUMENTS 180524-02 0.2m 50-PIN RIBBON CABLE

National Instruments NI PXI-6031E DAQ Board

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National Instruments Relay Module SCXI-1000 SCXI-1160

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National Instruments. SCXI. RS485 / Parallel Adapter.

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National Instruments Type X2 763507-02 2.1 Meter

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National Instruments PXI-1010 8-Slot PXI/4 SCXI Chassis

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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。