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3HAC9880-1来电询价
3HAC9880-1
3HAC9880-1

接地的目的通常有两个，其一为了安全，其二是为了抑制干扰。完善的接地系统是PLC控制系统抗电磁干扰的重要措施之一。

 

系统接地方式有：浮地方式、直接接地方式和电容接地三种方式。对PLC控制系统而言，它属高速低电平控制装置，应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响，装置之间的信号交换频率一般都低于1MHz，所以PLC控制系统接地线采用一点接地和串联一点接地方式。集中布置的PLC系统适于并联一点接地方式，各装置的柜体中心接地点以单独的接地线引向接地极。如果装置间距较大，应采用串联一点接地方式。用一根大截面铜母线（或绝缘电缆）连接各装置的柜体中心接地点，然后将接地母线直接连接接地极。接地线采用截面大于22 mm2的铜导线，总母线使用截面大于60mm2的铜排。接地极的接地电阻小于2Ω，接地极最好埋在距建筑物10 ~ 15m远处(或与控制器间不大于50m)，而且PLC系统接地点必须与强电设备接地点相距10m以上。

 

信号源接地时，屏蔽层应在信号侧接地；不接地时，应在PLC侧接地；信号线中间有接头时，屏蔽层应牢固连接并进行绝缘处理，一定要避免多点接地；多个测点信号的屏蔽双绞线与多芯对绞总屏电缆连接时，各屏蔽层应相互连接好，并经绝缘处理。选择适当的接地处单点接点。

Qty. 1 Allen-Bradley 800T-N40 Ser B Red Pilot Light Lens - new - 60 day warranty

Allen-Bradley box of 50 end barriers 1492-N17 - 60 day warranty

Honeywell IACD MINI-PRO temp DC3002 controller - used - 60 day warranty

GE TEF TEF124020WL Circuit breaker 20 amp 2 pole - 60 day warranty

Hammond MT250MQMJ control transformer 250VA 50/60Hz- 60 day warranty 

JACKE GmbH EAS 360VA transformer - 60 day warranty

Allen-Bradley 1771-AM2 ser. A  I/O chassis - 60 day warranty

Dwyer Magnehelic indicating transmitter - 605-0 - 60 day warranty

Cutler Hammer EATON programmable controller D100A - 60 day warranty

Allen Bradley 1770-P1 power supply - 60 day warranty

Gehause system aluminum enclosure 01142009 - nib sealed - 60 day warranty

Hoffman Q-4PBPCD enclosure - sealed - 60 day warranty

Fedral LSL-120B Blue tower light module 120vac  factory sealed - 60 day warranty

Neilsen-Kuljian MM1AC-NC curent operated switch motor monitor - 60 day warranty

Bussmann Optima fuse block 30a 600v OPM-1038RC - 60 day warranty

Lovato BF12C 10-24vdc contactor - 60 day warranty

Allen Bradley 855P-B10DEP22 alarm series. A - new - 60 day warranty

Qty 42 Allen Bradley 800T-N42 Amber lense - new - 60 day warranty

Elmo ESA-15/75HC Controller - nib - 60 day warranty

Qty 10 Allen Bradley 800T-N26B pilot light Blue acrylic lense - 60 day warranty

Qty 36 Allen-Bradley 1492-UT4T - 60 day warranty

3343 - custom - Simpson - 0-5 mAAC - 60 day warranty

Omron input module C200H-IA122 - 60 day warranty

Allen Bradley 1745-E103 Ser B expansion - used 60 day warranty

Cutler Hammer Eaton programmable controller D100ACR20A - nib - 60 day warranty

Allen Bradley 1771-OG 1771OG Module - nib - 60 day warranty

Warner electric 5103-451-007 field assem. SF-250 flange mount - 60 day warranty

Dartronics material handling control system - 60 day warranty

Qty 2 Ralphs-Pugh  rollers with mounting bracket - 60 day warranty

Unimount 125 F245A 1.5HP 3ph 1730rpm electric motor - 60 day warranty

Milltronics ST25 transducer - used - 60 day warranty

Alemite centralized lubrication 4085-4 SER H-3 - 60 day warranty

Browning 5-3V 80 5 groove sheave - 60 day warranty

Allen Bradley 1494F-N60 used - 60 day warranty

Martin 53V560SK Sheave - 60 day warranty

Martin sprocket & gear inc.  P56-8M-30-SDS - used - 60 day warranty

Allen Bradley 190-CPS40 starter  with 190P100 190A40 - 60 day warranty

Gates 3393M09 Timing belt - New - 60 day warranty

Anti vibration isolation dampener - heavy duty 4 x 4 - 60 day warranty

Milltronics compuscale / compuflo III - for parts not working

ACDC Electronics power supply 10/5amp - 115/230V - 50/60hz - 60 day warranty

HOPE INDUSTRIAL HIS-ML17 operator interface 17" Touchpanel monitor - used

SMC CDG1BN100-75 air cylinder - new - 60 day warranty

SM-CYCLO HF-314510 258:1 speed reducer - 60 day warranty

SM-Cyclo HF-314510 522:1 speed reducer - 60 day warranty

ITE Siemens Q130 circuit breaker - 60 day warranty

Brady 64960 3" x 5" NFPA diamond label cartridge - NIB - 60 day warranty 

Sm-Cyclo CHF-4135DCY-231 231:1 speed reducer - 60 day warranty

SS110 Eectro-Sensors inc. Model SS110 slow speed switch - new - 60 day warranty

Allen-Bradley 700-FSA4UU23 time delay  range 0.5 - 60 hours - 60 day warranty

Allen-Bradley 42GRL-9000 photoelectric sensor - NIB - 60 day warranty

Allen Bradley HB-473 COIL - 60 day warranty

Bourns 3640S-1-502 - 3640S1502 Potentiometer 10kΩ - New - 60 day warranty

Instruments transformer 2DRL-SD 50:5A 600v 10kv - new - 60 day warranty

Littlefuse LT60100 3C 3 pole fuse block - new - 60 day warranty

Box of 50 Allen-Bradley 1492-SJ5A-24 jumper strip - nib - 60 day warranty

Qty 19 Sprecher + Schuh V7-EBTF3  end barriers - new 60 day warranty

Qty 41 Allen-Bradley 1492-EBTF3  end barriers - new 60 day warranty

Ashcroft 45-1259-SL-02L 160psi gauge - nib - 60 day warranty

Liebert MP2-115A bypass 120V 12A - nib - 60 day warranty

Ashcroft B450V XCK06 pressure switch w/ C1215 seal - nib - 60 day warranty

Endress & Hauser FTI51 liquicap M  level probe 17.75" - NIB - 60 day warranty

Niobrara R&D CORP MUCM-002 Communication module - nib - 60 day warranty

Allen-Bradley pilot light 800T-QSTH10W - nib - 60 day warranty

Foxboro IAP20-A22B01F-M2 Transmitter - nib - 60 day warranty

Crompton 252-PVAU 5a 250vac 50/60hz & 24vdc - nib - 60 day warranty

Finder 94.02 relay interface module - nib - 60 day warranty

Milltronics Siemens 7ML18301BT universal mounting adapter 2"  60 day warranty

Allen-Bradley 800H-PRAH16W Illuminated pushbutton 120v  - new - 60 day warranty

KTU-800 Bussmann current-limitting Class L fuse 800A 600V -

Qty 3 Bussman Fuses KBC-70 70 amp  600 volt - new - 

Allen-Bradley 100-DTS110 terminal cover - new  - 60 day warranty

Dwyer 1823-10 pressure switch - new  - 60 day waranty

Allen-Bradley 440N-Z21S17A non-contact switch - new - 60 day warranty

Allen-Bradley 802M-DY5 limit switch series B - used  - 60 day warranty

Allen Bradley 802M-DY5 Pre-Wired limit switch series B - new  - 60 day warranty

Fusetron SRY 4" Box-Cover unit / fuseholder and receptacle new - 60 day warranty

Sick PS51-1000 PS511000 power supply used - 60 day warranty

Vibratory level sensor probe with 3 1/2" sanitary ring - used - 60 day warranty

Allen-Bradley 42MRU-5000 photoswitch with 42MTB-5000 base - used 60 day warranty

Allen-Bradley 1794-IE4X0E2 series B - 60 day warranty

Allen-Bradley 42LRC-5200 photoswitch with 42LTB-5000 base - used 60 day warranty

Allen Bradley 42LRC-5000 photoswitch with 42LTB-5000 base - used 60 day warranty

Allen Bradley 1202-C30 series A comm cable - new - 60 day warranty

Qty 12 Allen Bradley 700-HB32A1-4 relay and base 120vac - 60 day warranty

Omnetics SDR1 15A4Y5 time delay relay - used - 60 Day warranty

Allen Bradley 800T-PC416 pilot light series. N - nib - 60 day warranty

Allen Bradley 800H-QRH24W pilot light - NIB - 60 day warranty

Allen Bradley DeviceNet 1485R-P3M5-C ser B - NIB 60 day warranty

Allen-Bradley DeviceNet 1485C-P1N5-M5 series B - nib 60 day warranty