变频器接地故障1)变频器输出滤波器与变频器不匹配,造成输出侧高频短路。2)电机受潮或进水造成电机接地短路。3)线路受损接地。
过电流故障对于变频器在调试与试运行期间出现过电流故障,可从电源、负载、变频器、振荡干扰等方面找原因。1)电源电压超限或缺相。电压超限应按说明书规定的范围进行调整。无论电源缺相或变频器缺相,都会导致电动机转矩减小而过流。2)负载过重或负载侧短路。重点检查机组有无异声、振动和卡滞现象,是否因工艺条件或操作方法的改变而造成超载。负载侧短路或接地,可用兆欧表进行检测。逆变器同一桥臂的两只晶体管同时导通也会形成短路。3)变频器设定值不合适。一是电压频率曲线中电压提升大于频率提升,破坏了U/fi的比例关系,造成低频率高压而过流;二是加速时间过短,所需加速转矩过大而造成过流;三是减速制动时间设定过短,机组迅速再**电回馈给中间回路,造成中间回路电压过高和制动回路过流。4)振荡过流。一般在以某转速(频率)运行时发生。主要原因有两个:一是电气频率与机械频率发生共振;二是纯电气回路引起如功率开关管的死区控制时间,中间直流回路电容电压的波动,电动机滞后电流的影响及外界干扰源的干扰等。对于**种情况,降低载波频率可能减小共振。在找出发生共振的频率范围后,利用跳跃频率功能跳过该共振频率。值得注意的是,使用变频器驱动大惯量如大车机构时,常由一个变频器驱动多个电机,采用V/f控制方式。当要求起制动较快时(如2s),则往往出现大车起制动振动剧烈,同时常伴有变频器过流。这与机械传动回路间隙成正比有很大关系。因此,应在机械减少间隙的同时采取减震措施。大车电机悬浮可摆动安装就是这一事例的成功应用。5)变频器容量偏小,应考虑换成大容量的变频器。
过电压故障在机构减速制动时变频器常发生过电压故障,其原因大都与中间回路及制动环节有关,主要是:1)电源电压过高,一般超过10%以上。2)制动电阻阻值过大或损坏,无法及时释放回馈的能量而造成过电压。3)中间回路滤波器电容失效容量变小或检测电路故障。应认真检查电容器有无异味、变色,安全阀是否胀出,箱体有无变形及漏液等现象。4)减速时间设定过短。5)对于安川CIMRG*4系列变频器,由于工厂现场电源一般为AC380V,所以应重新设定变频器及制动斩波器电源电压使之与其一致,以免起制动时变频器出现过电压故障。
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KLA-Tencor Tropel 15X Objective 29-0260 untested
KLA-Tencor SLX Preamp Assy. 775-334268-001 untested
KLA-Tencor AIT 2 MMD Assembly 0038216-000 AB Working
Pair KLA-Tencor 525227 AB AIT 2 Video Switch Working
KLA-Tencor CRS1010 ASYST 05551-001
KLA TENCOR IMAGE PROCESSOR,200Mhz,VME,770-809195-000
KLA TENCOR IMAGE PROCESS BOARD,VME,710-806050-01 REV.D2
KLA Tencor Scan Generator II PCB 820-06915
KLA Tencor P/N: 710-060031
Expedited shipping ailable
KLA-Tencor CRS1010 Fast Z Controller 001003 PCB
KLA-Tencor CRS1010 PMT Preamp PCB 000276
KLA-Tencor 0115574-000 OPTICAL LENS UNIT
KLA-Tencor 52-0285 OPTICAL UNIT
KLA-Tencor 504815 port stage ( air )
KLA Tencor ASSY 710-608020-01 Board ,
KLA-Tencor CRS 2000 Power Supply working
KLA-Tencor 29-0259 Tropel 1X Lens Untested
KLA-Tencor CRS-1010 Control PCB 311-14988-1
KLA-Tencor CRS-1010 Control PCB 311-14988-1 working
KLA-Tencor CRS-1010S Review Station DC Power Supply
KLA-Tencor CRS-1010S DC Power Supply working
KLA-Tencor 0045260-000 OPTICAL UNIT
KLA-Tencor 0035627-000-AC OMS , SHUTTER ASSY,AIT UV
KLA-Tencor 760-031905-00 LENS ASSY ,
KLA-Tencor Patlight Controller Board 710-450885-00
KLA-Tencor Commtech RS-232 Board 232/8-ISA 00160502-000
KLA-Tencor CRS1010 TRT/OPT PCB 001009T working
KLA-Tencor CRS1010 Solenoid PCB 000678 working
KLA-Tencor TRT/OPT Control PCB 001009 working
KLA-Tencor CRS1010 A-Stop Control PCB 001002T working
KLA-Tencor CRS1010 Filter Wheel Drv. PCB 000674T
KLA-Tencor CRS1010 BF/DF Control PCB 000675T
KLA-Tencor CRS1010 Solenoid PCB 000678T working
KLA-Tencor CRS1010 A-Stop Control PCB 001002 working
KLA-Tencor Yaskawa Handler End Effector 0077427-002
KLA-Tencor CRS1010 Driver Module 000675T working
KLA-Tencor CRS1010 Vibration Isolator Set working
KLA-Tencor Nikon Box Door Opener 750-059211-001
KLA-Tencor CRS1010 A-Stop Control PCB 001002 working
KLA-Tencor CRS1010 Turret Optics PCB 000676 working
KLA-Tencor CRS1010 Filter Wheel Drv. PCB 000674 working
KLA-Tencor CRS1010 BF/DF Control PCB 000675 working
KLA-Tencor CRS1010 Solenoid PCB Assy. 000678 working
KLA Tencor PN: 710-806051-01 rev.AO DP Board
KLA-Tencor PWA E11-13209-7 REV-D E11-13209
KLA TENCOR,710-806051-01 REV.A0 VME BOARD
KLA-Tencor Power Supply 18-122516 Astec LPS254
KLA Tencor Instruments PN: 080810 PCB ASSY, SFS-4500
KLA-TENCOR PCB, MOTOR CONTROL 112976
KLA-Tencor 30-0070 Techsol Mini Environment 016-98
KLA-Tencor CIP2 SE Head Replacement 0115724-001 Bad
KLA Tencor Vacuum Driver/Sensor 181137 REV B
OAC PRECISION CRYSTAL OSCILLATOR / RF DRIVER KLA
LOT KLA TENCOR POWER CHANGER ND FILTER MOTORS
KLA TENCOR LON MOTOR DRIVER BOARD 001050T REV A
KLA Tencor 740-323100-002 Mini-circuits ZHL-1-2W-11
KLA-TENCOR LON MOTOR DRIVER BOARD 00045 + 001024
KLA-TENCOR SCINTILLATOR, 1700 107-009
KLA Tencor 0101497-000 Kollmorgen Servostar PD Driver
KLA Tencor 0078060-000 NM Laser Shutter
KLA Tencor Shipping Energy Filter Assy 720-12647-002 AA
KLA - Tencor optics Mirror , Conce , 250MM
KLA-Tencor Marway 230V Power Strip 0046059-000
KLA Tencor 730-656752-000 Cable Assy
KLA Tencor Inductive Proximity Switch 730-450573-00
KLA TENCOR CARTRIDGE, SM300 SPECTRAMAP 50-0057
Brand 8U Rackmount 12 Bay Storage - KLA Tencor
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