描述

JAMSC-B2602AV

失电压与欠电压保护
如果由于某种原因，电网电压突然消失，正在运行的电动机就要停止运行。那么，在电源电压又重新恢复时，电动机又会自行起动。这种情况很容易造成生产设备的损坏，甚至造成人身事故。因此，必须加设保护措施，即当电网电压消失（如停电）后而又重新恢复时，要求电动机及其拖动的运动机构不能自行起动，以确保操作人员和设备的安全，这种保护称为失压保护。例如，许多机床都是用按钮操作起动的，利用按钮的自动恢复和接触器的自锁作用可起到失压保护作用。
还有一些机床是用控制开关操作的，均有自锁环节。自锁环节的电路本身已具备了失压保护作用。
当电机正常运行时，由于电压过分降低，将引起一些电器释放，造成控制线路工作失调，可能产生事故。因此必须在电源电压降到一定允许值以下时切断电源，这就是欠压保护。一般常用电磁式电压继电器实现欠压保护。当电源电压过低或消失时，电压继电器就释放，从而切断控制回路，电压再恢复时，也能起到失压保护作用。总之，电压继电器可以确保在预定电平上起到保护作用。

产品承诺：
保证全新原装进口,
保证安全准时发货，
保证售后服务质量，
优势价格，大量现货。

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Allen Bradley SLC100 1745-E105 Series B Expansion Unit

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New in Box 1745-M1 Allen Bradley SLC 150 1745-M1 N812
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ALLEN-BRADLEY SLC 100 PROGRAMMABLE CONTROLLER 1745-E105

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Allen Bradley SLC 100 Expansion Unit 1745E101 1745-E101

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ALLEN BRADLEY SLC 150 1745 E151 EXPANSION UNIT PLC

Allen-Bradley Eeprom Memory Module 1745-M1 Series B
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New Allen Bradley Battery Assembly, 1745-B1
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Allen Bradley PLC SLC-100/150 1745-PCC cable (12ft)
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Allen Bradley SLC 150 Programmable Controller 1745LP151

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ALLEN BRADLEY (1745-E101) SLC100 EXPANSION UNIT

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Allen Bradley Bulletin 1745 SLC Controller User Manual!

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Allen Bradley Relay Expansion Unit SLC 100 1745-E105 B

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ALLEN BRADLEY SLC 150 EXPANISION UNIT 1745-E151 SER B

Allen Bradley SLC Expansion Unit 100 1745-E101 E1O1

ALLEN BRADLEY 1745-E101 SLC 100 Expansion Unit

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Allen Bradley (2) New Ribbon Cables 1745-C3

Allen Bradley SLC 100 Expansion Unit, 1745-E105, Ser C

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Allen Bradley SLC 100 Programmable Controller 1745-E103

Two AB Allen Bradley SCL 150 Expansion Unit 1745E153/A

Allen Bradley 1745-C2 SER B

Allen Bradley Cable 1745-C3

Allen Bradley SLC 100 Processor Unit 1745-LP101 control

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AB Allen Bradley SLC 100 Expansiion Unit 1745-E103/A

ALLEN BRADLEY A-B 1745-C3 CABLE 1745C3

Allen Bradley SLC 100 Expansion Unit, 1745-LP101, Ser B

Allen Bradley SLC 100 Expansion Unit, 1745-LP101, Ser C

Allen Bradley SLC 150 Expansion Unit 1745-E153 A SLC150

Allen Bradley SLC 100 Expansion Unit, 1745-E101, Ser A

ALLEN BRADLEY 1745-M1 EEPROM MEMORY MODULE

ALLEN-BRADLEY SLC 150 1745-E151 EXPANSION UNIT SER B

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JAMSC-B2602AV

描述

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