6ES7414-2XK05-0AB0 亿佳询
在同一工厂内大型电机一起动,运转中变频器就停止,这是为什么?
电机起动时将流过和容量相对应的起动电流,电机定子侧的变压器产生电压降,电机容量大时此压降影响也大,连接在同一变压器上的变频器将做出欠压或瞬停的判断,因而有时保护功能(IPE)动作,造成停止运转。
21、什么是变频分辨率?有什么意义?
对于数字控制的变频器,即使频率指令为模拟信号,输出频率也是有级给定。这个级差的小单位就称为变频分辨率。
变频分辨率通常取值为0.015~0.5Hz.例如,分辨率为0.5Hz,那么23Hz的上面可变为23.5、24.0 Hz,因此电机的动作也是有级的跟随。这样对于像连续卷取控制的用途就造成问题。在这种情况下,如果分辨率为0.015Hz左右,对于4级电机1个级差为1r/min 以下,也可充分适应。另外,有的机种给定分辨率与输出分辨率不相同。
22、装设变频器时安装方向是否有限制。
变频器内部和背面的结构考虑了冷却效果的,上下的关系对通风也是重要的,因此,对于单元型在盘内、挂在墙上的都取纵向位,尽可能垂直安装。
23、不采用软起动,将电机直接投入到某固定频率的变频器时是否可以?
在很低的频率下是可以的,但如果给定频率高则同工频电源直接起动的条件相近。将流过大的起动电流(6~7倍额定电流),由于变频器切断过电流,电机不能起动。
24、电机超过60Hz运转时应注意什么问题? 超过60Hz运转时应注意以下事项
(1)机械和装置在该速下运转要充分可能(机械强度、噪声、振动等)。
(2) 电机进入恒功率输出范围,其输出转矩要能够维持工作(风机、泵等轴输出功率于速度的立方成比例增加,所以转速少许升高时也要注意)。
(3)产生轴承的寿命问题,要充分加以考虑。
(4) 对于中容量以上的电机特别是2极电机,在60Hz以上运转时要与厂家仔细商讨。
25、变频器可以传动齿轮电机吗?
根据减速机的结构和润滑方式不同,需要注意若干问题。在齿轮的结构上通常可考虑70~80Hz为大极限,采用油润滑时,在低速下连续运转关系到齿轮的损坏等。
Schneider Automation 140 CPS 114 10 TSX Quantum PLC
Best Power UT3120 UPS 120KVA 120KW
COMPUTYPE 3-AXIS NEXSTEP AUTOMATION w/ CONVEYOR 14x36''
Friedrich Deckel 2250 Pantograph
7 Intermec 601XP EasyCoder Thermal Printer
Lot of Intermec Tracker Wireless Barcode Scanner
2 Adept 310 Robotic controller supply
2 HP 7418A Event Recorders
ETTER CONTINUOUS CONVEYOR BELT Plastic Drying Dryer OV
Amtech 900B Ultrasonic Metal Welding Harness
Amtech 900B Ultrasonic Metal Welding Harness
Amtech 900B Ultrasonic Welder Welding Harness
Amtech 900B Ultrasonic Welder Welding Harness
Amtech 900B Ultrasonic Welder Welding Harness
Amtech 900B Ultrasonic Welder Welding Harness
Watking Johnson 12CD-721R Heat Tunnel Oven
HP Agilent 6032A System Power Supply 0-60V, 0-50A
345 Britax 372 Rotating Amber Halogen Beacon
Carlyle 06NW2250S7EA A00 HVAC Compressor Motor
Heller 942C 4-Zone Table Top Reflow Oven
2 Erbium Crystalase CLR2940 YAG Dermatology Lasers Las
Nissui MBE3003 Plastic Mixing Mixer System
Mikron Neslab Black Body Calibration Source
GE SCP PLUS Switchboard 480Y277AC
Tektronix TV1350 TV Demodulator
1 Kenco Kompac Press 3K-7-100 3 Ton
Amtech 900B Ultrasonic Welder Welding Harness
ACER AGS-1224AHD SURFACE GRINDER 12X24
Electro-Craft IQ2000 PDM-20 Indexer Servo
3 Becker RV33/13-606-01 Vacuum Pump Blower
TCE 705-58 GRP 504 Winding Machine Winder
Clinton STBG-29ALR PDC-20 DC Pinhole Detector
5 HP 85024A High Frequency Probe
Reliable Rubber Plastic 4319 Press Platen Hydraulic
27 Stanley 120-7180 AGR Framed Sliding Doors
Artos TA-20R-10 Crimper Cutter w/ feeder
Rota-Flow DP-150-E30 Power Unit Hydraulic Elevator Dov
3 UTE SCS124 Wafer Substrate Cleaning System Post Dici
4 Michelin Offroad TIRES 16.00 R20 X2L TUBELESS STEEL
Horlick 50PF-31 Sychronous AC Generator Motor-Generator
Omega-Alpha Metals 500 Ionic Contamination Test System
Chemical Safety Technologies Pump Station BCA Sump
Adept Cobra 600 Robot Robotic Arm
Sumitomo SE54Q2MT-072 Fiber Optical Cable 1500FT
Corning 12SME Optical Cable 38000ft
Stangenes Isolation Transformer SI-7356 100KVDC 500W
Prysmian Corning 6FSME 6SMEBG704 Fiber Optical Cable
VSI Automation 503HH Screwfeeder Screwdriver Center Bo
Angstrom 250LV Spectrometer Excitation Source
Schlumberger SRS 7776006601 Rev01 MainFrame 16 Front P
Gamma High Voltage Research RR1.1-40N/M264A 40MA 1.1KV
Angstrom S-1000 Spectrometer Readout Control System
Adept Technology PA-4 30336-31000
Rockwell Delta Fiber Glass Vertical Band Saw
Adept PA-4 Robot Amplifier Chassis Dual B+
GIFU AICHI 241977 Dry Type Transformer
AMI 465 Water Screen Printer
PEERLESS PUMP HYDROCONSTANT VARIABLE SPEED DRIVE
Amsco Vacamatic A 3110 PF Motor Maration Electrics
Marconi Instruments 2022D 10Hz 1GHz Signal Generator
Universal Labeling System
Audion Elektro VM201 PAC Audiovac Vacuum Sealer
National Instruments PCI-6542 Digital Wave Form Genera
2 Shermco AC Distribution 2300V ITE/ED
3S Phoenix 8013 Inspection System Pick & Place
Kulicke & Soffa K&S 1484 XQ Auto Wire Bonder
KH Hupport ST Electric Burn-In Furnace
KH Hupport ST Electric Burn-In Furnace
ASYS EUS-01 Turning Station 24V
COGSDILL CX-1T-A EXTERNAL ROLLER BURNISHING MACHINE
Automated Assembly RZ-300SLVGXX robot robotic arm
SMI Press Stamping Dies Die Lot
JTIDS TE/A05A0479-510TD MCP T
- 6ES7412-2XJ05-0AB0 亿佳购 2024-06-19
- 6ES7412-1XJ05-0AB0 亿佳购 2024-06-19
- 6ES7400-0HR50-4AB0 亿佳购 2024-06-19
- 6ES7400-0HR00-4AB0 亿佳购 2024-06-19
- 6ES7417-4HT14-0AB0 亿佳购 2024-06-19
- 6ES7414-4HM14-0AB0 放大板 2024-06-19
- 6ES7412-3HJ14-0AB0 熔断器 2024-06-19
- 6ES7971-0BA00 按键条 2024-06-19
- 6ES7405-0RA02-0AA0 底槽 2024-06-19
- 6ES7405-0KA02-0AA0 总线插头 2024-06-19