A4H254-8F8T

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描述

A4H254-8F8T

开关电源的输入电路大都采用电容滤波型整流电路，在进线电源合闸瞬间，由于电容器上的初始电压为零，电容器充电瞬间会形成很大的浪涌电流，特别是大功率开关电源，采用容量较大的滤波电容器，使浪涌电流达100A以上。在电源接通瞬间如此大的浪涌电流，重者往往会导致输入熔断器烧断或合闸开关的触点烧坏，整流桥过流损坏;轻者也会使空气开关合不上闸。上述现象均会造成开关电源无法正常工作，为此几乎所有的开关电源都设置了防止流涌电流的软启动电路，以保证二手机器人电源正常而可靠运行。
如果采用“软启动电路”来消除开关电源启动时的浪涌电流，可以很好地避免上述传统浪涌电流限制方法的缺点。通过“软启动”来控制开关电源的启动以消除浪涌电流，包含这样两条设计原则：即在加电瞬间除去负载、同时限制有用的电流。如果不驱动负载，开关电源启动时一般电流很小。在很多情况下，启动电流实际有可能要比利用这种方法保持的稳态工作电流小。
浪涌电流指电源接通瞬间，流入电源设备的峰值电流。由于输出滤波电容迅速充电，所以该峰值电流远远大于稳态输出电流。电源应该限制AC开关、整流桥、保险丝、EMI滤波器件能承受的浪涌水平。反复开关环路，AC输入电压不应损坏电源或者导致保险丝烧断。

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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

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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。

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