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MVI46-MBPMVI46-MBP MVI46-MBP MVI46-MBP MVI46-MBP MVI46-MBP MVI46-MBP MVI46-MBP MVI46-MBP的详细信息MVI46-MBP MVI46-MBP 图1 单元串联变频器结构 图2 功率单元结构 每个功率单元分别由输入变压器的一组二次绕组供电,功率单元之间及变压器二次绕组之间相互绝缘。如采用每相六单元串联的形式,则每个功率单元承受全部的输出电流,但仅承受1/6的输出相电压和1/18的输出功率;对于6KV的电机系统,每单元输出电压0~590V可调,频率0~50Hz可调,从而可实现变频控制。 单元串联型高压变频器各的功率单元采用载波相移PWM技术进行控制,对于图1所示的变频器由n对依次相移60°/n的三角载波对参考波电压进行调制。对A相基波调制所得的n个信号,分别控制A1~An n个功率单元,经叠加即可得具有2*n+1级阶梯的相电压波形。它相当于6*n脉波变频,理论上6*n-1次以下的谐波都可以抵消,总的电压和电流畸变可低至1%左右,因此也堪称完美无谐波变频器。该系列变频器同一相的功率单元输出相同的基波电压,串联各单元之间的载波错开一定的相位,每个功率单元的IGBT开关频率若为1KHz,则当每相有6个功率单元串联时,等效的输出相电压开关频率为12KHz。功率单元采用低的开关频率可以降低开关损耗,而高的等效输出开关频率和多电平可大大改善输出波形。波形改善除减小输出谐波外,还可降低噪音、du/dt值和电机的转矩脉动。所以这种变频器用于调速电源对电机无特殊要求,可用于普通的高压电机,且不必降额,对输出电缆长度也没有特殊限制。 二 单元串联型高压变频器故障处理方法分析 为了提高单元串联型变频器的可靠性,使其在部分功率单元发生故障后仍能够继续运行,传统的故障处理方法是采用屏蔽掉故障单元与另外两相中相应的非故障单元,以保持变频器的平衡运行,这样势必会造成非故障单元的浪费,因而最大输出能力较低。该方法的优点在于原理简单,技术成熟可靠。 为了在单元故障后充分利用所有的非故障单元,进一步提高多电平逆变器的输出性能,可以采用中性点移位技术。中性点移位原理是利用变频器的中性点是浮动的,且不连接到负载中点(例如目前广泛应用的三相电动机),因此变频器中性点可以偏离负载中点。尽管变频器输出三相相电压不平衡,但通过调整相电压的相位可以得到三相平衡的负载线电压。这样的调整方式,相当于故障后在各相剩余单元输出的不对称电压上共同叠加一个零序分量,以合成三相对称的线电压。由于两个中点不直接连接,因此该线电压在负载上可以产生对称的负载相电压,从而保证负载的对称稳定运行。但是由于三相不再对称,此时通过注入三次谐波以提高单元电压利用率的优化控制方法不再适用,因此,中性点移位的处理方式并没有充分利用系统的最大输出能力。某些故障状态下,其最大输出能力甚至比传统的屏蔽故障单元及其对应另外两相非故障单元的处理方式还要低。 NEW CHESTERTON 155E CARTRIDGE SINGLE STATIONARY SEAL 2" SHAFT SEAL SIZE 16 RJS INSPECTOR 3000 BARCODE SCANNER MISSING BATTERY COVER NEXPRESS K272900A WEB CONTROL ELECTRONIC AUXILIARY ASSEMBLY K272901A00A SQUARE D QMB-FAW 100A CIRCUIT BREAKER ADAPTER W/ 20 AMP FAL34020 & 30A FAL34030 SQUARE D QMB-FAW 100A CIRCUIT BREAKER ADAPTER WITH TWO 20 AMP FAL34020 GUSHER 5 HP MULIT-STAGE HIGH PRESSURE COOLANT PUMP MSC4-7-500FJ AMF CUNO SEMLER INDUSTRIES 3" FILTER HOUSING W/O INSERT 60" HIGH 12SL4 NEW ROSEMOUNT ALPHALINE PRESSURE TRANSMITTER 45 VDC 1151DP6E12 NEW HOWDEN BUFFALO GE 1 HP BLOWER / MOTOR MODEL BL NEW ITT DIA-FLO 4" NEOPRENE ACTUATED DIAPHRAGM VALVE 4-2431-T-34-335?0 NEW TB WOODS 225P VARIABLE SPEED SHEAVE 5/3 HP 1750/1160 RPM NEW OSRAM XENON SHORT ARC LAMP 2500 WATT XBO-2500/HS OFR YORK ISN DIRECT DIGITAL CONTROL CENTER LDC/34 371-01183-109 NEW ABB PRESSURE TRANSMITTER 600T SERIES 10.5/55 VDC MODEL 621ESC2UULBG811?1 RELIANCE 2 HP MASTER XL GEARMOTOR 50:1 RATIO 230/460 VAC 1725 RPM 145 FRAME NEW WESTINGHOUSE TRANSFORMER DIFF. RELAY 290B346A10B CHICAGO PNEUMATICS CP-0351 ASXEL COMPRESSION RIVETER CP0351 ASXEL PARKER PNEUMATIC CYLINDER 5" BORE 54" STROKE 71" LENGTH TOMTEC QUADRA 96 MODEL 320 LIQUID HANDLER AUTOMATED WORKSTATION 196-320 ENDRESS HAUSER PROMASS FLOW METER 33AT08 SN1ED13E21A NEW DSI 4" STEEL FLANGED KNIFE VALVE W/ HANDLE CLASS 150 285 PSI ACCUTRUE 90 SERVO PLANETARY GEARHEAD RATIO 40:1 SIZE 14 NEW VICKERS DG5S-8-4C-E-M-W?-B-20 DIRECTIONAL CONTROL VALVE & DGV4-3-68C-M-W-?B-40 RELIANCE 3 HP INVERTER DUTY ELECTRIC MOTOR W/ ENCODER 460 VAC 182TC 2625 RPM REBUILT WESTINGHOUSE TECO 25 HP ELECTRIC MOTOR 230/460 VAC 3545 RPM 284TS AEHE NEW GE HEA 61C240X2 MULTI-CONTACT AUXILIARY RELAY COIL 125VDC HEA61C240X2 FLUX INSTRUMENTS 4000 RHEOS PERISTALTIC LAB PUMP NEW SQUARE D TELEMECANIQUE 10 HP SOFT MOTOR STARTER ATS48D17YU 460 VOLT NEW VELAN 2" STAINLESS STEEL BALL VALVE 01413-SSE-A RELIANCE 20 HP AC VARIABLE TORQUE DRIVE 5VU41020 460V XYCOM 9487 OPERATOR INTERFACE PANEL 9487-2891319010?000 90-250 VAC EMERSON 25 HP ELECTRIC MOTOR FIRE PUMP MOTOR 230/460 VAC 3525 RPM 3 ? FF25S1EV NEW GRUNDFOS 1 HP VERTICAL 1-1/4" CENTRIFUGAL PUMP CR 2-60 A-P-G-BUBE NEW WERIE RIETSCHIE TLV-10 ROUGH VACUUM PUMP 11.7M3/HR 150M BAR MOTOR 120 240 V SQUARE D CIRCUIT BREAKER LH36300 3 ? 300 AMP VERY CLEAN MOTOROLA MOTHER BOARD CONTROLLER 37645-106 SIEMENS MASTERDRIVES MC AC/AC DRIVE 6SE7011-5EP50-Z 480 V 3 PHASE TRIAC 1-1/2" STAINLESS STEEL ACTUATED BALL VALVE 2R80SR VALVE POSITION MONITOR EMERSON CONTROL TECHNIQUES SERVO MOTOR 3000 RPM 220/240 VAC 075E2D300BACAA0?75140 NEW BALDOR VESCOR 1-1/2 HP AC PUMP MOTOR 1-1/4" NPT BRASS FITTINGS 1725 RPM NEW FANUC AC SERVO MOTOR A06B-0353-B831 NEW BOSTON ISO 9002 GEAR REDUCER SERIES 700 100:1 RATIO 2.97 HP MA752-100-6 US ELECTRICAL 1/2 HP HAZARDOUS LOCATION GEARMOTOR 220/440 VAC 3 ? 9.46:1 RATIO CUTLER HAMMER 250 AMP MAIN BREAKER ELECTRICAL PANEL 240 VAC 3 ? 48 CIRCUIT CAMCO 320C-02 PROGRAMMABLE MOTION CONTROLLER 12 MODULE CHASSIS EBERHARD BAUER D-7300 GEAR REDUCER 27.31:1 RATIO DF2A65H2L2/309K?-AS/M NEW ROSEMOUNT 1054 A ENCLOSED TOTAL FREE CHLORINE ANALYZER 115 VAC NEW DIONEX SOLVENT DELIVER PUMP SINGLE PISTON ISOCRATIC 120 VAC 0-4 AMP DQP-1 MODICON BRUSHLESS SERVO MOTOR CGD27-R 120-087-001 NEW DUNKERMOTOREN BG40X50 BRUSHLESS VARIABLE SPEED MOTOR W/ GEARHEAD PLG52 NEW STI UNIVERSAL SAFETY MAT UM SERIES UM4224 NEW STI UNIVERSAL SAFETY MAT UM SERIES UM3630 DORRIS 1209 GEAR REDUCER MODEL 1209 9.212 RATIO 8.3 HP 1750 RPM INDUSTRIAL DEVICES CORPORATION LINEAR ACTUATOR EC3B32-1516B-15?0-MS2-MT1E-BS23?0 NEW BOSTON GEAR SPEED REDUCER RATIO 14.45:1 MODEL F226DPH-14-B7 NEW COPELAND REFRIDGERATION COMPRESSOR CRK3-0325-TFD-9?70 380/460VAC US MOTOR SYNCROGEAR GEAR REDUCER 3/4 HP RPM 30/40 345/115VOLT RATIO 43.7:1 2.6 A REFURBISHED CONTROL LASER POWER SUPPLY 1 KW 0-1700 V 1014533 208-240 V 3 PHASE NEW Phytron ZSH 87/1.200.7 Hybrid Stepper Motor 2Phase 6 Pin Step Connector Male ALLENAIR BRASS PNEUMATIC AIR CYLINDER C-4-36-OS-RC-CH NEW ROSEMOUNT ALPHALINE PRESSURE TRANSMITTER 45 VDC 1151AP4E12B2 SIEMENS LANDIS & GYR POWER MODULE 545-703 SANDPIPER 1/2" SB-1-SS AIR POWERED STAINLESS STEEL DOUBLE-DIAPHRAG?M PUMP SB1-A BIOPAC SYSTEMS UIM100C UNIVERSAL INTERFACE MODULE UIM 100 C ARO 1" AIR POWERED ALUMINUM DOUBLE-DIAPHRAG?M PUMP 666100-4EB-C RELIANCE ELECTRIC GP-2000 15 HP VS DRIVE 2GU41015 480VAC PARKER PNEUMATIC CYLINDER 4" BORE 38" STROKE BB2AUS14C NEW PARKER BAYSIDE PG60-020 SERVO GEARHEAD 20:1 5000RPM NEW BRUNSWICK SCIENTIFIC PROGRAMMABLE DOSING PUMP DP200 NEW IMHOF 16.08:1 RATIO GEAR REDUCER TYPE S60 LP100 SHAFT 1-3/8" X 2-3/4" NEW TUTHILL TECHNAFLO PUMP MODEL K10694 WITH .5 HP BALDOR HAZARDOUS LOC AC MOTOR NEW ALLEN BRADLEY 3 HP AC DRIVE 1336- BRF30-AA-EN4 SENSORLESS VECTOR 380/480 VAC NEW DAYTRONICS 7 DIGIT DIGITAL INDICATOR MODEL 9530A NEW BELL & GOSSETT 3/4" PUMP 1-1/4X1-1/2 208-230/460 VAC 3450 RPM 3 ? P63FZK4408 NEW BALDOR 1 HP ELECTRIC BRAKE MOTOR 115-208/230VAC 1725 RPM 143TC FRAME 1 PHASE NEW RSP 100-2E ROBOTIC SWIVEL TOOL CHANGER P0421 GREENLEE SEGMENT SWIVEL TOP BENDER 772 WITH STORAGE CABINET 1531 31" X 18" X 15" NEW LENZE GET7-2WVBR 18:1 RATIO WORM GEAR REDUCER 1-1/8 INPUT NEW MARZOCCHI HYDRAULIC GEAR PUMP 3AD110ACSTP 7/8" D X 1" L SHAFT SEW EURODRIVE GEAR SPEED REDUCER 8.5:1 RATIO S82LP184 CUTLER HAMMER 125 AMP CIRCUIT BREAKER 600 VAC 3 POLE MODEL FD3125L GE FUSIBLE DISCONNECT SWITCH 400 AMP QMR325 RECONDITIONED AMERICAN LEWA PUMP GEAR HEAD TYPE EK1 NEW STI MINI FLEX SAFETY LIGHT CURTAIN MIRROR 42326-0240 42326-0160 NEW GE EUROTHERM DRIVE 3 HP DC ELECTRIC MOTOR TEFC XP 5BY552MC800A803 REFURBISHED Conair EB17MLD Control Board R07 BAILEY DIFFERENTIAL PRESSURE TRANSMITTER PTSDDF1NN1301AH W/ DIAPHRAGM SEALS ARO BARREL PUMP 612106 600 PSI 41 BAR HANKISON 10 SCFM 100 PSIG COMPRESSED AIR DRYER HKN8010 115 VAC HANKISON 10 SCFM 100 PSIG COMPRESSED AIR DRYER 8010-115 115 VAC CRANE FERGUSON MODEL 2H2 ALTERNATING INDEX DRIVE NEW ALLEN BRADLEY GUARDMASTER MATGUARD SENSOR MAT 440F-M1830CYNN 60"X36" NEW BALDOR 3/4 HP AC ELECTRIC WASHDOWN MOTOR CWDM3542 56C FRAME 1725 RPM C-FACE NEW HINGED ELECTRICAL ENCLOSURE LOCKING W/ KEY 45" HIGH X 34' WIDE X 12" DEEP SQUARE D SIZE 1 30 AMP COMBINATION MOTOR STARTER W/ 30 AMP BREAKER 8536SCO3S NEW SQUARE D SWITCHGEAR LOAD SIDE FUSE ACCESSORY 80102 GE VERTICAL SHAFT 7.5 HP ELECTRIC MOTOR L213TP10 FRAME 5K213DBB5003A NEW KYOCERA KST-104-8MPD1-S?KS PRINT HEAD FOR M8400 LABEL PRINTER PH268-21-A39 ALLEN BRADLEY 1336S-BRF100-AN?-EN4 10 HPAC DRIVE 380/460 VAC 1201-HJ2 KEYPAD NEW RELIANCE ELECTRIC RECTIFIER STACK ASSY. 86466-11R GENERAL ELECTRIC SCR STACK MODULE 36C774353ABG09 GENERAL ELECTRIC SCR STACK MODULE 36C774353ABG02 NEW RELIANCE ELECTRIC CIRCUIT BOARD 803624-15F 091793 NEW UNISYS UM4100 ALARM MONITORING SYSTEM FOR REMOTE LOCATION SSD ARMATURE + FIELD CONTROLLER 548-1800-8-2-3-?120-1010 NEW COLMAN 3" CONTROLINE CAST IRON 3-WAY MIXING CHECK VALVE VB-9313-0-5-13 NEW PARKER ZENITH 084E437 HYDRAULIC PLANETARY GEAR MOTOR 8.5 CC/REV ITW-017 IWAKI STAINLESS METER PUMP & ALLEN BRADLEY 1 HP MOTOR 4A143THTN6028AA?R143 NEW STEARNS BRAKE ASSY. 1087021H0ELF 460 VAC 1.125 BORE NEW NELES JAMESBURY 1-1/2" STAINLESS STEEL SPRING RETURN VALVE SP18SR80-B MARSH 1/2" HAND OPERATED STENCIL MACHINE MODEL H NEW NELES JAMESBURY ACTUATED DIAPHRAGM VALVE 1 1/2" GOULD MODICON B577 010 MODULE 0-10V ANALOG 4 INPUTS MODICON B577010 HAZLUX 7 HAZARDOUS LOCATION LIGHT FIXTURE 120/277 VAC 2X36 WATT XFT07H08RA NEW WESTINGHOUSE 80 AMP CIRCUIT BREAKER 480 VAC 3 POLE MODEL REH3080 JOHN S BARNES PR610414AG94B 2 HP HYDRAULIC UNIT 208/230VAC 34540 RPM J56Y FRAME NEW RELIANCE ELECTRIC 0-57140-20-E REGULATING MODULE ALLEN BRADLEY 1747-L533 SERIES E REV B SLC 5/03 CPU PROCESSOR UNIT WITH KEY NEW NDH DELCO SHIELD BEARING 5611 NEW SMC PNEUMATIC SLIDE TABLE 16MM BORE MODEL MXQ16L-100 BURKS 5 HP CENTRIFUGAL PUMP 1-1/2"X2" 208-230/460 VAC 3480 RPM 3 ? T350G6-1-1/2 NEW HEIDENHAIN INTERPOLATION IBV 650 TYPE 277 236-71 SORENSEN MODEL DCR150-12B DC POWER SUPPLY 0 - 150 VOLT OUTPUT 0 - 12 AMP CARL ZEISS JENNA MODELL I BENCH TOP REFRACTORMETER NEW KENNEDY KS/FW 10" FLANGED CAST IRON WEDGE GATE VALVE 200 PSI NEW TELEMECANIQUE 3 HP VARIABLE SPEED CONTROLLER 240 VAC 3 PHASE ATV151U22MO GE 60 AMP MECHANICALLY HELD LIGHTING CONTACTOR 24 VDC COIL 600 VAC CR160MA4200A NEW OBERDORFER GEAR IRON HYDRAULIC GEAR PUMP 18GC1211S SIZE 1-1/4" NPT PORT BALCRANK BOBCAT 130 OIL PUMP MODEL # 1110-003 1.3:1 RATIO XANTREX 60 WATT DC POWER SUPPLY XT-250-0.25 NEW GRACO ROBOTICS KEYBOARD ASSEMBLY WITH CIRCUIT BOARD CM 851-015 NEW PEC PROCESS ELECTRONICS CORPORATION SCR RECTIFIER ASSEMBLY DR-91279-02 NEW WESTINGHOUSE A201K2EA CONTACTOR SIZE 2 45 AMP 5 POLE 25 HP 600 VAC NEW ALLEN BRADLEY 150-A16NC SMART MOTOR CONTROLLER SMC2 NEW BROWNING GEAR REDUCER 20:1 RATIO 3.72 INPUT HP MODEL 325Q180L20A TORK ASTRONOMICAL DIAL TIME SWITCH WITH MANUAL CONTROL TZ302L NEW NORD GEAR GEARMOTOR 3 PHASE 11.38-1 RATIO TYPE SK71 L/4 1/2 HP SHAFT 20 MM TORK ASTRONOMICAL DIAL TIME SWITCH WITH MANUAL CONTROL TZ300L OLYMPUS AXL-100 EXPLOSION PROOF LIGHT SOURCE 115 VAC 100 WATT 2 AMP INGERSOLL RAND ARO 2:1 RATIO DIFFERENTIAL TRANSFER DRUM PUMP MODEL 650133 INGERSOLL RAND ARO 2:1 RATIO DIFFERENTIAL TRANSFER DRUM PUMP MODEL 650110-1C STENTOFON GCP CIRCUIT BOARD MODEL 1000632000 NEW BONFIGLIOLI GEAR REDUCER 9.8:1 RATIO 1" BORE TYPE C50 2 UP P100 ALLEN BRADLEY SIZE 4 MOTOR STARTER 480 VAC COIL 600 VAC 100 HP 3 ? 509-EOB NEW NISSEI GFM-18-60-T90K INDUCTION MOTOR 200/220 VAC 1600 RPM 3 ? 90 WATT ALLEN BRADLEY SIZE 3 MOTOR STARTER 120 VAC COIL 600 VAC 50 HP 3 PHASE 520VF-DOD NEW WATLOW IMMERSION HEATER 7 Kw 7-18-219-308 NEW NELES JAMESBURY 3/4" PNEUMATIC ACTUATED DIAPHRAGM VALVE G130EGC62EA2U NEW GRACO SERVICE KIT PART NO. D0F366 POWELL 3" STAINLESS STEEL SWING CHECK VALVE CLASS 150 CF8M BAILEY FISCHER PORTER 53MC5 PROCESS CONTROLLER 53MC5412A25BAAX?DXDXX 120 / 240 V NEW EATON VICKERS HYDRAULIC SINGLE VANE DISPLACEMENT PUMP V101P1P1A20 HONEYWELL IMA CONTROL MODULE MODEL 622-1041 CAMCO MIC 8272 DC STEPPER TRANSLATOR 50 VOLT AC ALLEN BRADLEY SIZE 0 STAINLESS STEEL FUSED COMBINATION STARTER 509-AOD TOSHIBA VT130G2+2015 1 HP TRANSISTOR INVERTER 208/230 VAC 1.5 KVA 3 PHASE AIRFLOW INSTRUMENTATION LCA6000 ANEMOMETER CUTLER HAMMER 7500XE EPRO 92-02040-00 PANELMATE EPRO BLIND NODE EXTENDED CHALLENGER 225 AMP MAIN BREAKER PANEL 208Y/120 VAC 42 CIRCUIT 3 PHASE NEW GE 1 HP DC ELECTRIC GEAR MOTOR 337 RPM OUTPUT 180 VDC 1" D X 1-3/4" L SHAFT NEW VICKERS DG5S-8-OA-E-M-W?-B-20 DIRECTIONAL CONTROL VALVE 120 VAC GB CPNS 200 EPROM PROGRAMMER COPELAND COPELAMETIC LAC1-0310-TAD-8?00 COMPRESSOR 3 PHASE 460 V NEW ALLIS-CHALMERS 1.5 X 1.5 X 9 HYDRAULIC CENTRIFUGAL PUMP TYPE 2000 MATTEC CORP CIRCUIT BOARD REV F MODEL 350-0102F 350-1020A YAMADA 3/8" STAINLESS STEEL DIAPHRAGM PUMP 100 PSI MODEL DP-10BST YAMADA 3/4" ALUMINUM DIAPHRAGM PUMP 100 PSI MODEL NDP-20BAT MOELLER DIL10H CONTACTOR COIL 120VAC GOULD ITE 100 AMP FUSED GROUND BUSS PLUG 600 VAC 75 HP 3 PHASE UV463 TEXAS INSTRUMENTS 5TI LOGIC CONTROLLER SEQUENCER MODEL 5TI-1034-2 NEW GM 3315A SHIELD BEARING NUMBER 615 BTR CONTROLS POWER DOOR CONTROL OPENER TELEMECANIQUE 2 HP DRIVE NEW MAGNETROL LIQUID LEVEL SWITCH 120/240 VAC 13/6.5 AMPS C29-1B30-3DD NEW PARKER COMPUMOTOR DYNASERV DRIVE SR1220E62-3SN*1?C PSYTRONICS P4801 TRANSIENT VOLTAGE SURGE SUPPRESSOR 1 PHASE 480 VAC NEW Advance Tabco 9-OP-20 16" x 20" x 6" Stainless Steel Floor Mounted Mop Sink Affymetrix GeneChip Fluidics 400 Wash Station 450 NEW GENERAL ELECTRIC TRANSFORMER 9T21B1004G02 240/480 HV 120/240 LV 5 KVA GE 11 KVA TRANSFORMER 460HV 266/460 LV 3 PHASE 9T21J1707 HAAKE MODEL MK 500 NEW DONALDSON 2" HYDRAULIC FILTER DF-1100N-MK CONDENSATE DRAIN UFM-P ELEMENT NEW ASCO VALVE 10.1W 2 1/2" PIPE EF8353G7 15-125 PSI NEW WARNER ELECTRIC DC OUTPUT CLUTCH MODULE 3600 RPM 2-5/8"X1" 5371-536-005 NEW MILLER FLUID POWER HYDRULIC CYLINDER 3" STROKE 3-1/2" ROD 14" BORE A64B2N ADEPT EJI BOARD REVISION D MODEL 10332-00505 NEW RELIANCE BARISH 1/8" STAINLESS STEEL MICROPUMP 1/3 HP 230/460 VOLT 3450 RPM EXIDE FORKLIFT BATTERY CHARGER NPC-6-I-800 220/440 VAC 1 PHASE 6 CELLS NEW FIBRO HYDRAULIC ACTUATOR 52.51.4.0180 56201 00548 NEW HARDY INSTRUMENTS WAVERSAVER C2 HI2151/20WC XRITE REFLECTION DENSITOMETER W/ DIGITAL DISPLAY & SOFT CASE 12 VDC MODEL 400 NEW PARKER DYNASERV DD SERVO DRIVE DYNASERV DR1220E110 BASLER ELECTRIC SOILD STATE PROTECTIVE RELAY NEG. SEQUENCE VOLTAGE BE1-47N |
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