140122
日期：2018-10-15
在自动控制电路中有以下保护环节，也是一般自动控制电路共有的保护环节。
（1）短路保护 电机、电器和导线的绝缘损坏或发生故障时，可能造成短路事故。很大的短路电流产生过热和电动力可能引起电器设备损坏，甚至因此引起火灾，因此要求一旦发生短路故障时，控制电路应能迅速地切断电路。
短路保护的常用方法是采用熔断器或断路器。这些保护装置不应受起动电流的影响而误动作。所以要按熔断器、断路器的选择和整定要求进行。
（2）长期过载保护和断相保护
电动机长期超载运行，绕组温升将超过其允许值，造成绝缘材料变脆、寿命缩短，严重时还会使电动机损坏。过载电流越大，达到允许温升的时间就越短。常用的长期过载保护元件是热继电器。热继电器不能兼作短路保护，因为发生短路时，它可能还来不及动作就已对电器设备造成损坏了。
据统计，因断相运行而烧坏电动机的台数，在有些单位竟多达损坏电机总台数的80%以上，所以电动机应该有断相保护的环节，也就是说要选用带断相保护功能的热继电器。
（3）零电压和欠电压保护
因某种原因电源电压突然消失，电动机都会停转。一旦电压恢复正常，如果电动机自行起动，往往会造成设备损坏或人身事故，也会因许多设备同时起动而造成对供电网络的过大冲击。因此，在电网电压消失时，要立即切断电源，实现零电压保护。
电源电压过分降低，会引起电动机转速下降甚至停转；在负载转距不变的情况下，电动机电流增大，造成绕组过热而损坏；电压过低还会引起一些电器释放，造成控制失常。因此，当电源电压降低允许值以下时，需要切断电源，实现欠电压保护。
起保停电路本身具有失压保护和欠压保护的功能。当电源失压或严重欠压时，接触器的衔铁自行释放，电动机停止运转。当电压恢复正常时，接触器线圈也不会自行通电，只有在操作人员再次按下起动按钮时，电动机才会起动。有的电路要求有更好的零压和欠压保护，还采用专门的欠压继电器或欠电压保护电路。 咨询热线：18150695049
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漳州鼎晟达自动化设备有限公司
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CUTLER HAMMER 3925B02G03 SNUBBER ASSEMBLY SMC 2-0 PCB CIRCUIT BOARD Box25B
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MITSUMI 4-115V-15700 J11 TDK-12V 0115V01100 E60647 MEC-A ATG pcb circuit board
WESTRONICS CB100322-01 FLOURESCENT LIGHT REV E PCB CIRCUIT BOARD D554889
SMC 8013EWC ISA PC Interface Card PCB PCA Board Assembly
Sweo Engineering -- 1001821 PCB --
SIEMENS CONNECTOR CIRCUIT BOARD PCB 571298.9001.02 571298.0001.02 T-RD8003B0
GE FANUC IC600CB500A ARITHMETIC CONTROL PCB CIRCUIT BOARD D555983
Kulicke and Soffa 01482-1001-000-02 Backplane PCB card. Gold Recovery
PERRETTA GRAPHIC PCB00162 MEMORY MODULE INTERFACE **
PTI 1-00997C ALARM LOGIC PCB CIRCUIT BOARD MODULE D555805
PTI 1-01271 BUFFER INTERFACE LEVEL 19 PCB CIRCUIT BOARD D555804
ZEBRA TECHNOLOGIES INTERFACE CARD PCB 49721, P/N 49721, REV. 2
No Name Circuit Board PCB P/N 24-0339 G ASY P/N 57-7665 G01
NEW SOLIDSTATE CONTROLS 80-210822-90 PRINTED RELAY MODULE PCB BOARD D557321
TELEDYNE 1003-0900-01 USI MONITOR LABS PCB CIRCUIT BOARD D557661
SIEMENS R15A02-227 150-300A RELCON DRIVES DIVISION PCB CIRCUIT BOARD Box28B
ICK 16445 D.C. POWER DISTRIBUTION PCB 16445
ICES PCB TERMINAL CIRCUIT BOARD CARD
GW1760 FDD HDD CONTROLLER ISA CARD PCB CIRCUIT BOARD D561883
MOLINS POWER FAIL AND INDICATOR PCB CIRCUIT BOARD CARD SA2752-122 54014-918
BUCHANAN PCB3A30A Terminal block
QUANTUM TM21A012 2.1GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
TOSHIBA MK6411MA 6GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DAQA-32160 2.1GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DARA-209000 9.04GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DARA-21200 12.07GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DBCA-204860 4.09GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DCAA-33610 4.3GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DHEA-34330 4.3GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DPTA-372050 20.5GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DTLA-305040 41.1GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM DTLA-307015 15GB IDE HARD DISK PCB For Data Recovery Service FREE SHIPMENT
IBM IEC-950 9.1GB SCSI HARD DISK PCB For Data Recovery Service FREE SHIPMENT
Fanuc A16B-1310-0111/03B PCB Circuit Board w/OA16D Chassis 0A16D A03B-0801-C117
COMPAQ 313706-B21(80 PINS)9GB SCSI3 HARD DISK PCB For Data Recovery Service
FUJITSU MAA3182SC 18.2GB SCSI 80PINS HARD DISK PCB For Data Recovery Service
MAXTOR 90432D3 4.3GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST310212A 10.2GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST310216A 10GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST31277A 1.2GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST313620A 13GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST315320A 15GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST320410A 20GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST320824A 20GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST32550W 20GB SCSI HARD DISK PCB For Data Recovery Service
SEAGATE ST340016A 40GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST34555W 4.5GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST3550N 500MB SCSI HARD DISK PCB For Data Recovery Service
SEAGATE ST360021A 60GB IDE HARD DISK PCB For Data Recovery Service
SEAGATE ST51270A 1.2GB IDE HARD DISK PCB For Data Recovery Service
QUANTUM CR84A011 8.4GB IDE HARD DISK PCB For Data Recovery Service
ALLEN BRADLEY PCB PROGRAM DISPLAY 120663 120771 REV 2... LOT OF 2........
GREAT CONDITION! ALLEN BRADLEY X1746-A7 B G02 7 SLOT PLC PCB BOARD
INTERROLL 8956 REV 7 PCB CIRCUIT BOARD ... LOT OF 2..
FADAL PCB-0135 REV A1 SERVO COOLANT PC BOARD ***NNB***
Reliance Electric Printed Circuit Board CVTD Current Voltage Module 051831003
Ishida P-5292 Printed Circuit Board For Weigher Control NWOB
Damaged Triangle 90WB8009AS Scale Board PCB
Numatics 156-640 B99 Circuit Board Assembly PCB Single
SCI 180-2354 Rev. B PCB Computer Circuit Board
SCI 080-2463 Rev. C PCB Board Computer Control Card
SCI 080-2355 Rev. A PCB Computer Module Circuit Board
FANUC ROBOTICS SAFETY BRAKE CONTROL PCB BOARD A16B-1212-0540/06D
NEW HEWLETT PACKARD SCAN JET INTERFACE CARD PCB CIRCUIT BOARD C2503-26500 SER B
INDRAMAT LED INTERFACE BOARD PCB MOA 1-00/00
New Reliance Electric 0-57002 Circuit Board PCB Pre-Set Speed Interface FreeShip
Lot of 3 Canon IR3245 Panel Switch PCB Assy Assembly NEW
DVT CON-600 600 Series Break Out Board DVT Corp. PCB601 Rev. 2 10/98 5601696
LEEDS NORTHRUP A86032 44584 REV 3 PCB CIRCUIT BOARD D539422
200D836 130D289 A PCB CIRCUIT BOARD D541016
NEW FUJITSU E16B-3009-R431 PCB CIRCUIT BOARD D523585
SIEMENS S30810 Q2473 X000 04 SLMR3 PCB CIRCUIT BOARD MODULE D523732
NEW FUJITSU E16B-3009-R150 B16DLA PCB CIRCUIT BOARD MODULE D523784
DALSA XL-F130-34002 REV A2 UMK-SE 11.25-1 PCB CIRCUIT BOARD D540344
EMTROL 811201-1-0 PCB CIRCUIT BOARD D540598
14 day WARRANTY Reliance 0-52823 PLC PCB Board
MAGNETROL 030-9151-001 REV A TERMINAL MODULE PCB
DELL PCB USB CIRCUIT BOARD CARD USB2.0 JM295 VER 1.0
Allen Bradley 1336-SN-SP3A / 74101-079-51 Rev B Board PCB PLC AB 74101-078-02A
New Oven Industries 5C7-251 Card Board PCB
RELCON CMB R71-00-054 R70-1-47 PCB BOARD LOT OF 3
CINCINNATI MILACRON Output Board PCB 3-531-3283A _ 35313283A
Varian 50-180003-06 PCB from Varian Cary 2200 spectrophotometer
Datavision S1FBLY-H 24064-29 LCD PCB Circuit Board
Fanuc PCB Circuit Board, A20B-0007-0070 / 08B, , WARRANTY
CARD CI-5050 REV. A C1-5050 SIEMENS NIXDORF DISYS PCB CONTROL PLC
SCI 080-2370 Rev. E PCB Control Computer Circuit Board
SCI 080-2306 Rev. E PCB Computer Circuit Board
ABB Robotics YB560103-CF/1 DSQC 237 PCB Circuit Board
SCI 080-2354 Rev. E PCB Computer Circuit Board
SCI 080-2355 PCB Computer Module Circuit Board
INGERSOLL-RAND KEY SCANNER PCB T21580-79 REV.C
EMERSON LIEBERT DC SENSOR PCB CIRCUIT BOARD 02-790886-00 REV. A
AE ADVANCED ENERGY MDX MDX380 PCB CIRCUIT BOARD CARD 2302040
Modicon PCB J513 Rev A Assy J513 NCI FR-O RAC0043482 Card Board
LOT OF 5 NEW TELEMECANIQUE ZB6-Y011 PLUG-IN SOCKET ADAPTERS FOR PCB MOUNTING
RELCON PCB CIRCUIT BOARD R15-2-9
Harting PCB-EL 0008 02 Leiterplatte mit Steckverbinder und Bügelverschlu? unge
THERMO ENVIRONMENTAL 49-4 PROCESSOR PCB CIRCUIT BOARD D542103
SIEMENS S30810-Q2484-X000-4 TMDN PCB CIRCUIT BOARD MODULE D523725
SIEMENS S30810-Q2484-X-5 TMDN PCB CIRCUIT BOARD MODULE D523729
NEW NORTEL NT8D14BB UNIVERSAL TRUNK CARD PCB CIRCUIT BOARD D523696
C-20-0-0068-09 IONIC FLAME MONITOR II REV 02 PCB CIRCUIT BOARD D539450
GE FANUC IC600CB503K SERIES SIX I/O CONTROL MODULE PCB CIRCUIT BOARD D520164
RELIANCE ELECTRIC 0-54394-10 , BASE DRIVER MODULE PCB CIRCUIT BOARD. #217331
ISHIDA P-5292 PCB BOARD
COMPAQ 94V-0 J1 010566-001 Matched Pair 6 LAYER CRIMM PCB CIRCUIT BOARD
Varian Motor Driver PCB 02-180015-00 Gold Recovery
SCI 080-2330 Rev. E PCB Control Computer Circuit Board
ALLEN BRADLEY 75006-271-01 DEVICENET CONNECTOR PCB CIRCUIT BOARD D532139
FUJITSU E16B-3013-R330 B16SLD PCB CIRCUIT BOARD D524170
ISHIDA P-5325A PCB CIRCUIT BOARD
Mitsubishi E12 F28 468 Power Monitor Receiver SW PCB
UNKNOWN BRAND NAME CIRCUIT BOARD CARD H2O PCB 300113-00 30011300 REV. A1
NIC Systems 05027-4R Terminal Card PCB Circuit Board Box8B
NEW SOLIDSTATE CONTROLS 210500 NOISE SUPPRESSOR PCB CIRCUIT BOARD D554583
DVT PCB601 5601696 DVT PC BREAK OUT BOARD PCB601 5601696 ,W/ PHOENIX CONTACT UM
Fanuc PCB Circuit Board, # A20B-0007-0750 / 05B, A13B-0070-B001, , WARRANTY
Primera PCB 210404 Rev. C
GC 22-506 PCB TRACKS STRIP BOARD *NEW IN FACTORY BAG*
Allen Bradley 50386 PCB Voltage Sensing Rev 02 PLC Module AB
NEW VECTOR 3690 EXTENDER CARD MODULE PCB CIRCUIT BOARD D555802
FORRY 040383 REV C PCB CIRCUIT BOARD D556740
AMAT 0720-90816, Conn, 25 Way, 90 Deg, PCB PLC D. 422960
TEAC POWER SW PCB CIRCUIT BOARD CARD 52102068-00
RIS 1051-354 AN3167 PCB CIRCUIT BOARD REV J D557681
FMC FOODTECH LOG-TEC MOMENTUM CIRCUIT BOARD PCB CARD POWER CONNECTOR COMMUNICATE
FMC FOODTECH LOG-TEC MOMENTUM CIRCUIT BOARD PCB CARD SE-1
Fanuc PCB Circuit Board, # A20B-0007-0750 / 03B, A13B-0070-B001, , WARRANTY
Allen Bradley 1336-SN-SP6A / 74103-216-51 Rev B Board PCB PLC AB 74103-217-02A
RELCON R15-2-0 DRIVE BASE RELAY REV 1 PCB CIRCUIT BOARD D564813
COMCO PCB PR1508 BOARD **
(Lot of 25)CP-WE-26 Bivar inc.CARD EJECTOR PCB 1.1
CRYDOM D2W203F11 Solid State Relay, SPST-NO, 3.5 A, 280 Vrms, PCB, Through Hole
Fanuc A20B-2900-0500 /04B Daughter Board PCB Module A350-2900-T508
Fanuc A20B-2900-0450 /03B Daughter Board PCB Module A350-2900-T456
Fanuc A20B-2900-0442 /02A Daughter Board PCB Module A350-2900-T446
KINGSTON PRINTED CIRCUIT BOARD KTV-TAM/32-CE 2128-058.A00 K2
FANUC ROBOTICS SAFETY BRAKE CONTROL PCB BOARD A16B-1212-0540/06D BROKEN PLASTIC
SCI 081-2306 Rev. A PCB Control Computer Circuit Board
SCI 081-2306 Rev. D PCB Computer Circuit Board
SCI 080-2306 Rev. G PCB Computer Circuit Board
NOS! PCB CAMERA INTERC PC BOARD 950-0451 9500451 400-0351 4000351 P77291 REV B
RELIANCE ELECTRIC 0-51845-1 PRSB PHASE SEQUENCE CIRCUIT BOARD CONTROL PCB *XLNT*
NEC R1247L 4W SF CHANNEL UNIT PCB CIRCUIT BOARD D525204
D11-J313 PCB CIRCUIT BOARD MODULE D522863
LOT 4 TELTRONICS LC-400E BRAND-REX PCB CIRCUIT BOARD D523648
NEC NDR064RTP R8520A D4C0184MAA 4W TO PCB CIRCUIT BOARD MODULE D524005
NEC R1254B D4CE1049AA 4W TO PCB CIRCUIT BOARD MODULE D524011
67981 PCB CIRCUIT BOARD D539281
RIS 142812L4 PCB CIRCUIT BOARD D539282
113065 PCB CIRCUIT BOARD D539277
67967 PCB CIRCUIT BOARD D539280
125P456 PCB CIRCUIT BOARD D539441
FEDERAL PIONEER DSP-FM 155-111B REV 1 FEEDER PCB CIRCUIT BOARD D531234
MEASUREX 05319100 HIGH DENSITY CONTACT OUTPUT BUFFER PCB CIRCUIT BOARD Box16,29B
30 day WARRANTY Reliance 0-52824 PLC PCB Board
Speeduino 0.4.3v PCB board + VR Conditioner v2
ACCUWEB RELAY CIRCUIT BOARD CARD PCB 3023
Fanuc PCB Circuit Board, # A20B-0007-0750 / 07B ,
PCB-SPINMOD-1B-1B ITD Automation PCB Control Board PCB-SPINMOD-1B PCBSPINMOD1B1B
PCB-SPINMOD-1B-2B ITD Automation PCB Control Board PCB-SPINMOD-1B PCBSPINMOD1B2B
TECHWORKS 11864-0001PCB 11832-0001 REV. A CIRCUIT BOARD
ALLEN BRADLEY POWER PCB DRIVE CIRCUIT BOARD 1HP 460V 42305-118-53 4230511853
30 day WARRANTY Reliance 0-54349 PLC PCB Board
30 day WARRANTY Reliance 0-52808-2 PLC PCB Board
Lot of 3 total Honeywell 14500111-002 & 14500144-002 Module PLC PCB Board Boards
TEAC POWER SW PCB CIRCUIT BOARD CARD 52102668-00
NEW HONEYWELL 51103613-10, 4DP7APXSV PCB CARD
Cincinnati PCB Circuit Board 3 531 4159A QTY
Ramsey 000-022108 POWER SUPPLY PCB CIRCUIT BOARD REV
UNKNOWN BRAND NAME PCB CIRCUIT BOARD CARD P-29-060 P29060
EDSTROM IND 6100-7020-010 PCB BOARD
Beckhoff C9900-A185 Dual video Interface PCB
SF336D/SPH1D5 PCB BOARD SF3-12
Omron G7SA-2A2B-DC24 PCB Relay 24VDC ! WOW !
VERSTAERKER SZ 5 AMPLIFIER PCB CIRCUIT BOARD D537378
Speeduino 0.4.3v PCB board