PLC控制系统的抗干扰是一个系统工程,要求制造单位设计生产出具有较强抗干扰能力的产品,且有赖于使用部门在工程设计、安装施工和运行维护中予以全面考虑,并结合具有情况进行综合设计,才能保证系统的电磁兼容性和运行可靠性。进行具体工程的抗干扰设计时,应主要以下两个方面。
在选择设备时,首先要选择有较高抗干扰能力的产品,其包括了电磁兼容性(EMC),尤其是抗外部干扰能力,如采用浮地技术、隔离性能好的PLC系统;其次还应了解生产厂给出的抗干扰指标,如共模拟制比、差模拟制比,耐压能力、允许在多大电场强度和多高频率的磁场强度环境中工作;另外是靠考查其在类似工作中的应用实绩。
在选择国外进口产品要注意:我国是采用220V高内阻电网制式,而欧美地区是110V低内阻电网。由于我国电网内阻大,零点电位漂移大,地电位变化大,工业企业现场的电磁干扰至少要比欧美地区高4倍以上,对系统抗干扰性能要求更高,在国外能正常工作的PLC产品在国内工业就不一定能可靠运行,这就要在采用国外产品时,按我国的标准(GB/T13926)合理选择。
3.2综合抗干扰设计
Mettler Toledo Hi-Speed HiSpeed Checkmate 2 CM6400GI-CM
Square D Load Current Interrupter Switch 600 Amp 15 kV
Square D NCP361200 NCP 1200 Amp A 1200A 600vac 1200Amp
Reliance Electric Motor 250 HP 1785 RPM Efficient 449U
Square D 800 Amp 800A SED36800LIES504 SED36800
TCI 250 HP Harmonic Guard 3H080A6L5A250 80 kVAR Filter
Reliance Electric Motor 250 HP 1785 RPM Efficient 449U
Siemens 6AV6 542-0AD15-2AX0 MP270 Simatic Multi Panel
GE Power Break PowerBreak TPMMF76 2500 Amp 2500A A
Hitran 440 kVA 575 Delta / 460 Delta 3ph 440kVA
Telemecanique Altivar 71 ATV71HD75N4 Drive 100HP/75kW
Siemens RL-3200 LM 3200 Amp Static Trip III RMS LSG
GE AKR-7D-75 3200 A Amp Low Voltage Air Breaker 635 V
GE AKR-7D-75 3200 A Amp Low Voltage Air Breaker 635 V
Square D NHL361200 NHL 1200 Amp A 1200A High Interrupt
4 Ton Coffing Electric Overhead Hoist Crane Lift 12′
Square D Breaker MEL36800 MEL36800LIG 800Amp 800 A Amp
Cutler Hammer 500 kVA 480/208Y/120 500kVA 208 Y
Westinghouse SPB 65 Pow-R Breaker SPB65 1600 Amp A
Reliance Electric Motor 250 HP 1785 RPM Efficient 449U
Reliance Electric Motor 250 HP 1785 RPM Efficient 449U
Westinghouse SPB 100 Pow-R Breaker SPB100 1600 Amp A
Square D NCP361200 NCP 1200 Amp A 1200A 600vac 1200Amp
C-H CH Westinghouse HND3800T107W Optim 800 Amp 800A A
Westinghouse Seltronic HNC31200F 1200 Amp A 1200Amp
Modicon MM-PMC2-300 PanelMate Plus P/N 91-00992-03
GE General Electric 3000 Amp Spectra Tap Box 3P 4W NEW
ASCO 800 Amp Transfer Switch 208 Y / 120 V C940380049C
Westinghouse Seltronic HNC31200F 1000 Amp A 1000Amp
Cutler Hammer 1200 Amp 1200A A HND312T35W 12NES1200T
GE AKR-6D-50 1600 A Amp Air Breaker Versa Trip LSG 635V
Siemens 1200 Amp A 5kV Type 5 3AF 250A 1200 58 Draw Out
ITE Gould Imperial 5600 5640 Sz 5 Fused MCC Bucket 270A
Eaton Fire Pump Controller 200 HP FD70-200D-LMR-L1-X1
with two Cutler-Hammer 400 A Amp Breaker Size 4 Starter
100 HP Dynamatic Motor Frame 405TDZ 230/460 V 1765 RPM
GE AKR-7D-50 1600 A Amp Air Breaker RMS-9 MVT LS 635 V
Cutler Hammer 1200 Amp 1200A A HND312T32W A12NES1200T1
I-T-E K-1600 K1600 1600Amp Digitrip RMS R810 Draw ITE
Fanuc A06B-6105-H002 6 Axis Servo Amplifier
GE High IC TKL12SS 1200 Amp 1200A A RMS9 TS20LSIGT2 800
Westinghouse Seltronic HNC31200F 1000 Amp A 1000Amp
Cutler-Hammer Power Breaker DSL II 620 DSLII 2000 Amp A
Cutler-Hammer Westinghouse Vacuum Breaker VCP-WR 4.76kV
Siemens SBH 2008 SBH2008 SBH2008F 800 Amp SB08TP02G
Siemens SBS 2008 SBS2008 SBS2008F 800 Amp SB08TP02G
Siemens SBH 800 SBH2008 SBH2008F 800A Amp SB08TP02G
Westinghouse DS-632 DS632 3200 Amp Digitrip RMS510 LSIG
CH Westinghouse 1200 Amp 1200A A HND312T32W 12NES1200T
Square D QED 3R QMB Switch Panel 2000 Amp A 2000Amp 3W
Siemens SBH 800 SBH2008 SBH2008DV 800A Amp SB08TP02G