描述
(1)变频器周围所有继电器、接触器的控制线圈上需加装防止冲击电压的吸收装置,如rc吸收器;
(2)尽量缩短控制回路的配线距离,并使其与主线路分离;
(3)指定采用屏蔽线的回路,必须按规定进行,若线路较长,应采用合理的中继方式;
(4)变频器接地端子应按规定进行,不能同电焊,动力接地混用;
(5)变频器输入端安装噪声滤波器,避免由电源进线引入干扰。
以上即为不输出干扰、不传送干扰、不接受干扰的“三不”原则。
2.变频器对周边设备的影响及故障防范
变频器的安装使用也将对其他设备产生影响,因此,研究应该采取哪些措施是非常必要的。
(1)电源高次谐波
由于目前的变频器几乎都采用pwm控制方式,在电源侧产生高次谐波电流,并造成电压波形畸变,对电源系统产生严重影响,通常采用的处理措施是:采用专用变压器对变频器供电,与其它供电系统分离;在变频器输入侧加装滤波电抗器,降低高次谐波分量。
(2)对于有进线电容器的场合因高次谐波电流将使电容电流增加,造成发热严重,必须在电容前串接电抗器,以减小谐波分量。
此外,由于变频器的软件开发更加完善,可以预先在变频器的内部设置各种故障防止措施,并使故障化解后仍能保持继续运行;
我们这里有您急需的停产备件,
优势现货,询不到的,买不到的,请联系我们!
绝 对优势,绝 对低价!绝 对正品,优质的产品,一流的服务,充足的库存,
欢迎来电询价,我们将会给您最优惠的价格!
主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
GE TVX X-ray Image Intensification System 1959 Ad
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL b9
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL p
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL m
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL q
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL c1
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL m
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL n
1973 Bendix Airport Baggage X-Ray System 2-Page Ad
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL B
X-RAY POSITIONER SYSTEM GOOD FOR SUNI & SCHICK SIZE 2
Field Emission Flexitron 730 Flash X-Ray System 1962 Ad
X-RAY POSITIONER SYSTEM GOOD FOR SUNI & SCHICK SIZE 1
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e1
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e3
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
Planar Systems Inc. iHBS212-08-Lite On 12X Blu-Ray Writ
Extreme Rage X-Ray Thermal Lens Goggle System Black
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL j
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL b8
Brand new LG 2 Target CD DVD & 10X Blu-Ray Burn systems
AMD PHENOM II X6 Desktop System BLUE-RAY!
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e7
X-PLOR Version 3.1: A System for X-ray Crystallography
4×5 NEG.- Accu Ray container fill control system ’58
X-RAY POSITIONER SYSTEM GOOD FOR SUNI & SCHICK SIZE 1
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL
Extreme Rage X-Ray Protector Goggle System
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e4
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL
EXTREME RAGE X RAY V2.0 GOGGLE SYSTEM # 21410 NIP
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e2
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e2
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e4
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e3
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e6
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e8
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e1
DENTAL PORTABLE MOBILE X- RAY MACHINE SYSTEM DIGITAL e5
IDDC Model 1200 Porta Ray Portable X Ray System
Mini Scan X-Ray Letter & Parcel Inspection System
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
Kodak 2100 Intraoral X-ray System
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL 2
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM DIGITAL 1
J B 70 INTRAORAL X-RAY SYSTEM THAT IS SMARTER
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM DIGITAL
GE Medical Systems X-Ray, Mamo Camera Printer, 5130/240
NEW I-MAX Easy Digital Dental Panoramic X-Ray System
NEW I-MAX Touch Digital Dental Panoramic X-Ray System
DENTAL PORTABLE MOBILE X RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X – RAY MACHINE SYSTEM w/DIGITAL
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM DIGITAL
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM w/DIGITAL
Replacement remote E-Stop for Iluma X ray system New
DENTAL PORTABLE MOBILE X-RAY MACHINE SYSTEM DIGITAL
Scanray Corp X-RAY System Control Board 08-1353-01 xray