1、什麽是变频器？ 
变频器是利用电力半导体器件的通断作用将工频电源变换为另一频率的电能控制装置。

2、PWM和PAM的不同点是什麽？ 
PWM是英文Pulse Width Modulation(脉冲宽度调制)缩写，按一定规律改变脉冲列的脉冲宽度，以调节输出量和波形的一种调值方式。PAM是英文Pulse Amplitude Modulation(脉冲幅度调制)缩写，是按一定规律改变脉冲列的脉冲幅度，以调节输出量值和波形的一种调制方式。

3、电压型与电流型有什麽不同？ 
变频器的主电路大体上可分为两类:电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容;电流型是将电流源的直流变换为交流的变频器，其直流回路滤波石电感。

4、为什麽变频器的电压与电流成比例的改变？ 
非同步电动机的转矩是电机的磁通与转子内流过电流之间相互作用而产生的，在额定频率下，如果电压一定而只降低频率，那麽磁通就过大，磁回路饱和，严重时将烧毁电机。因此，频率与电压要成比例地改变，即改变频率的同时控制变频器输出电压，使电动机的磁通保持一定，避免弱磁和磁饱和现象的产生。这种控制方式多用於风机、泵类节能型变频器。

5、电动机使用工频电源驱动时,电压下降则电流增加;对於变频器驱动,如果频率下降时电压也下降，那麽电流是否增加？ 
频率下降(低速)时,如果输出相同的功率,则电流增加,但在转矩一定的条件下,电流几乎不变。

6、采用变频器运转时，电机的起动电流、起动转矩怎样？ 
采用变频器运转，随著电机的加速相应提高频率和电压，起动电流被限制在150%额定电流以下(根据机种不同，为125%~200%)。用工频电源直接起动时，起动电流为6~7倍，因此，将产生机械电气上的冲击。采用变频器传动可以平滑地起动(起动时间变长)。起动电流为额定电流的1.2~1.5倍，起动转矩为70%~120%额定转矩；对於带有转矩自动增强功能的变频器，起动转矩为100%以上，可以带全负载起动。

7、V/f模式是什麽意思？ 
频率下降时电压V也成比例下降，这个问题已在回答4说明。V与f的比例关系是考虑了电机特性而预先决定的，通常在控制器的存储装置(ROM)中存有几种特性，可以用开关或标度盘进行选择。

8、按比例地改V和f时，电机的转矩如何变化？ 
频率下降时完全成比例地降低电压，那麽由於交流阻抗变小而直流电阻不变,将造成在低速下产生地转矩有减小的倾向。因此，在低频时给定V/f,要使输出电压提高一些,以便获得一定地起动转矩,这种补偿称增强起动。可以采用各种方法实现,有自动进行的方法、选择V/f模式或调整电位器等方法。

9、在说明书上写著变速范围60~6Hz，即10:1，那麽在6Hz以下就没有输出功率吗？ 
在6Hz以下仍可输出功率，但根据电机温升和起动转矩的大小等条件，**使用频率取6Hz左右，此时电动机可输出额定转矩而不会引起严重的发热问题。变频器实际输出频率(起动频率)根据机种为0.5~3Hz.

10、对於一般电机的组合是在60Hz以上也要求转矩一定，是否可以？
通常情况下时不可以的。在60Hz以上(也有50Hz以上的模式)电压不变，大体为恒功率特性，在高速下要求相同转矩时，必须注意电机与变频器容量的选择。

11、所谓开环是什麽意思？ 
给所使用的电机装置设速度检出器(PG)，将实际转速反馈给控制装置进行控制的，称为“闭环”，不用PG运转的就叫作“开环”。通用变频器多为开环方式，也有的机种利用选件可进行PG反馈。

12、实际转速对於给定速度有偏差时如何办？ 
开环时，变频器即使输出给定频率，电机在带负载运行时，电机的转速在额定转差率的范围内(1%~5%)变动。对於要求调速精度比较高，即使负载变动也要求在近於给定速度下运转的场合，可采用具有PG反馈功能的变频器(选用件)。

13、如果用带有PG的电机，进行反馈後速度精度能提高吗？ 
具有ＰＧ反馈功能的变频器，精度有提高。但速度精度的植取决於ＰＧ本身的精度和变频器输出频率的解析度。14、失速防止功能是什麽意思？ 

14、如果给定的加速时间过短，变频器的输出频率变化远远超过转速(电角频率)的变化，变频器将因流过过电流而跳闸，运转停止，这就叫作失速。为了防止失速使电机继续运转，就要检出电流的大小进行频率控制。当加速电流过大时适当放慢加速速率。减速时也是如此。两者结合起来就是失速功能。

15、 有加速时间与减速时间可以分别给定的机种，和加减速时间共同给定的机种，这有什麽意义？ 
加减速可以分别给定的机种，对於短时间加速、缓慢减速场合，或者对於小型机床需要严格给定生产节拍时间的场合是适宜的，但对於风机传动等场合，加减速时间都较长，加速时间和减速时间可以共同给定。 

16、 什麽是再生制动？
电动机在运转中如果降低指令频率，则电动机变为非同步发电机状态运行，作为制动器而工作，这就叫作再生（电气）制动。 
17 、是否能得到更大的制动力？ 
从电机再生出来的能量贮积在变频器的滤波电容器中，由於电容器的容量和耐压的关系，通用变频器的再生制动力约为额定转矩的10%~20%。如采用选用件制动单元，可以达到50%~100%。

18 、转矩提升问题 
自控系统的设定信号可通过变频器灵活自如地指挥频率变化，控制工艺指标，如在烟草行业的糖料、香料工序，可由皮带称的流量信号来控制变频器频率，使泵的转速随流量信号自动变化，调节加料量，均匀地加入香精、糖料。也可利用生产线起停信号通过正、反端子控制变频器的起、停及正、反转，成为自动流水线的一部分。此外在流水生产线上，当前方设备有故障时後方设备应自动停机。变频器的紧急停止端可以实现这一功能。在SANKEN、MF、FUT和FVT系列变频器中可以预先设定三四个甚至多达七个频率，在有些设备上可据此设置自动生产流程。设定好工作频率及时间後，变频器可使电机按顺序在不同的时间以不同的转速运行，形成一个自动的生产流程。

Rexroth Z1S 6 F1-33/V Ventil

Rexroth Z1S 10 P1-33/V Check Valve      Z1S10P1-33/V

REXROTH Z1S 10 F1-33/V HYDRAULIC VALVE R900417597      ConDITION / NO BOX

Rexroth Z1S 10 D1-33/V Rückschlagventil

REXROTH Z15L/110S/12 *     *

REXROTH Z15 6 E05-40/V HYDRAULIC CHECK VALVE *     NO BOX*

Rexroth Z 2 FS 22-31/S2/V Flow Control Valve

REXROTH WU35-4-A-459   WU354A459

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Rexroth WU35-0A 380 Solenoid Valve w/ Coil 120V 46VA 60HZ

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Rexroth WD432747 A MM-10D-10, Shipsameday W/2-3daysshipping#1559A11 Box 1

REXROTH VTS0609-2X/F/EA1 *     *

REXROTH VTS0609-2X/F PC BOARD *     *

REXROTH VTS0205-1X/DIB PC BOARD *     *

REXROTH VTS0205-10/DIB PC BOARD *     *

REXROTH VTS0104S1X/WM1 PC BOARD *     *

REXROTH VTS0104-1X/WM1 PC BOARD *     *

Rexroth VT-3024 Prop Amplifier w/ VT-3002 Card Holder VT3024S34 R1

Rexroth VT-3024 Prop Amplifier VT3024S35 VT3024 R1 S35 Circuit Card

Rexroth VT-3024 Prop Amplifier

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REXROTH VALVES 24VDCv 820-023-502

Rexroth Valve, ZDB 6 VB2-40/100V,      , Warranty

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Rexroth Valve Block LFA25WE/B62/B10/12       #68322

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Rexroth Valve 4WE10JB21/AW / WH70-4-A 229 110V 50/60Hz, 90B-1

Rexroth Valve 4WE 6 Y53/AG24NK4       #52165

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REXROTH VALVE 3430070000 *     

Rexroth Valve 308 883       #6135

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Rexroth Valve 2518-1-9110-1       #40859

REXROTH VALVE 0821300929 *     *

REXROTH VALVE 0820 060 761 *     *

REXROTH VALVE 0820 038 102 *     *

REXROTH VALVE 0820 038 102 (AS PICTURED) *     *

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REXROTH VALVE 0 820 260 003 MAX 10 BAR 9180 0820260003

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Rexroth Vacuum Module 0 821 305 160

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REXROTH V581-5/2SR, 5811110200 DIRECTIonAL VALVE (     IN BOX)

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REXROTH TYPE 740 VALVE PW-067716-00001

Rexroth Type 572741 Pneumatic Valve

REXROTH TYPE "S" PRESSURE REGULATOR -      NO BOX - NO PAPERS

Rexroth Typ740/5727940920 Magnetic Valve      IN BOX

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Rexroth TM-26539-3160 Task Master Pneumatic Cylinder 1-1/2" X 16" B-1-1/2" S-16"

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REXROTH TM-121000-03070 TASK MASTER 12 3/8" - 19 3/8" AIR PNEUMATIC CYLINDER     

REXROTH TM03153200000 **NIB**

REXROTH TM-026541-00000 TASKMASTER II CYLINDER, 1 1/2 X 3, 150 PSI (     IN BOX)

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Rexroth TaskMaster R432020422 Cylinder 1-1/2X6 NIB

Rexroth Taskmaster Pneumatic CYLINDER TM-031470-00100 2" X 10" 200 PSI

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Rexroth TaskMaster Cylinder 200psi TM-821000-03050

Rexroth TaskMaster Cylinder 200psi 7877-08 TM-120000-03074

REXROTH TASK MASTER R432022673 *     NO BOX*

Rexroth Task Master Pneumatic Cylinder TM-821000-03240 _ 2 x 24 _ TM82100003240

REXROTH TASK MASTER PNEUMATIC CYLINDER R43202189, 3-1/4X2, 200 PSI

REXROTH TABLE ASSY R11732001

REXROTH SWITCH 0821100010 *     IN BOX*

REXROTH SUP-M01-DKCXX.3-040   SUPM01DKCXX3040

REXROTH SUP-M01-DKCXX.3-040    SUPM01DKCXX3040

REXROTH SUP-M01-DKCXX.3-040     SUPM01DKCXX3040

REXROTH SUP-M01-DKCXX.3-016    SUPM01DKCXX3016

Rexroth SUPERKUGELBüCHSE MNR:R073124040 SUPER LINEAR BUSHING

Rexroth SUPERKUGELBüCHSE MNR:R067105000 SUPER LINEAR BUSHING

Rexroth Super Linear Bushing Model R073223040 1-1/4" Bore 1-3/4" OD NIB

Rexroth Steckdosenleiste MNR 3 842 539 852 Plug Socket Strip Neuwertig OVP

REXROTH STAR RUNNER BLOCK/BALL RAIL 165341410 *    *

REXROTH STAR RUNNER BLOCK BALL RAIL, CARRIAGE GUIDE 1651-214-10 STOCK#1949

REXROTH STAR RUNNER BLOCK / BALL RAIL, 1651-814-10 *NIB*

Rexroth STAR Linear-SET 1087-612-20 OVP

Rexroth Star Linear Systems runner block & 6" ball rail     

Rexroth Star Linear Set BA:321313 , BA321313

Rexroth Star Linear Set - BA:321313

Rexroth Star Linear Rail R160570331 L876,0mm 876mm     

Rexroth Star Linear Motion Rail 200L, 2 Rails 2 Blocks

REXROTH STAR LINEAR BALL BEARING 1622-812-813-814-10

Rexroth STAR Kugelbüchse 0611-040-10 OVP

Rexroth STAR 20 1665-894-20 AA09N Linear Roller Guide Rail Block

Rexroth STAR 20 1665-894-20 AA08N Linear Roller Guide Rail Block

Rexroth STAR 20 1653-813-20 AA08N Linear Roller Guide Rail Block

REXROTH STAR 1662-794-11 RUNNER BLOCK / BALL RAIL      ConDITION IN BOX

Rexroth Star 1653-713-10, Schiene 290 mm lang, Ball Rail System Size 30

Rexroth Star 1653-713-10, Schiene 240 mm lang, Ball Rail System Size 30

Rexroth Star 1653-713-10, Schiene 235 mm lang, Ball Rail System Size 30

Rexroth Star 1653-713-10, Schiene 210 mm lang, Ball Rail System Size 30

Rexroth Star 1622-814-10 Runner Block / Ball Rail

Rexroth Star 1622-794-10 Linear Rail Bock

REXROTH STAR 1591-6-1700 PILLOW BLOCK BEARING ASSEMBLY      ConDITION IN BOX

REXROTH STAR 1591-1-3020 PILLOW BLOCK BEARING, 30MM INNER DIAMETER,     *

REXROTH STAR 1591-1-3020 PILLOW BLOCK BEARING, 30MM INNER DIAMETER,     

Rexroth Star 12B wide linear rail, 375mm long, bearing slide, CNC IKO NSK

Rexroth Standard operating panel: R911311070, parameter set FCC01.1.T-STD-NNNN

REXROTH STACKMASTER VALVE PS-24040-0956 *    *

REXROTH STACKMASTER VALVE PS-24040-0456 *    *

Rexroth ST10061-2440 Pneumatic Valve

REXROTH SP-ULA-30/2   SPULA302

REXROTH SP-ULA-30/2    SPULA302

REXROTH SPARE KIT 1827009557 *     IN BOX*

REXROTH SOLENOID W5147 LOT OF 3

REXROTH SOLENOID VALVE, WU35-0-A-219, HYDRAULIC VALVE, 120V, 60Hz, 46VA

Rexroth Solenoid Valve HED 8 OA 12/50 K14/12 HED8OA1250K1412 250 VAC 125 VDC     

REXROTH SOLENOID VALVE HED 4 OP 16/50 Z14

REXROTH SOLENOID VALVE GT10050-3340

Rexroth Solenoid Valve GS-020051-00440_GS02005100440_GS-O2OO51-OO44O

REXROTH SOLENOID VALVE 4WE6E52/AG24NDAV 4WE6E52AG24NDAV W/ GU35-0-A 501 24V DC

REXROTH SOLENOID VALVE 4WE6E51/AG24NZA 1630 mona

REXROTH SOLENOID VALVE 4WE6D60/EW110N9K4

Rexroth Solenoid Valve 4WE6D51/AG24N9K4/V       #49618

REXROTH SOLENOID VALVE - NIB- PT# 572 705 5270

Rexroth Solenoid Oper. Valve 4WE6C52/AG24NK4 GU35-4-A-060 4WE6C52

Rexroth solenoid directional valve 24VDC - float ,     

REXROTH SOLENOID COIL R900020175      

REXROTH SOLENOID CHECK VALVE Z2S 6-2-64/65 R900347496 99572

Rexroth Solenoid Ceram Valve GT-010061-00440_GT01006100440_GT-O1OO61-OO44O

REXROTH SOLENOID 100% ED 120VAC 50/60HZ 4.3VA UN      0314

REXROTH SL-10-PA1-42 CHECK VALVE

REXROTH SK2-01   SK201

Rexroth Size 6 Directional Control Valve R978017757 (HYD1255)

REXROTH SH-3 ConTOLAIR VALVE P66183-2 200PSI *     *

Rexroth Servo-Motorleitung für MKD Servomotor 4x1.0 + 2x(2x0.75) mm2 L = 5 mtr.

Rexroth Servo-Geberleitung für MKD Servomotor 2x0.5 + 4x(2x0.25) mm2 L = 5 mtr.

REXROTH SERVICE KIT SUP-M01-DKCXX.3-100 *ORIGINAL PACKAGE*

RexRoth Selenoid Valve,     

REXROTH SEAL KIT 1827009077 *     IN BAG*

REXROTH SEAL KIT 0490368604

REXROTH SEAL KIT 049-036-421-8 *     IN BAG*

Rexroth Schirmanschlussblech HAS02.1-003-NNN-NN HAS021003NNNNN NOV

Rexroth Schirmanschlussblech HAS02.1-002-NNN-NN NOV

REXROTH S30A1.0/12 CHECK VALVE

REXROTH S20A3.0/5   S20A305

REXROTH S20A0.0/5   S20A005

REXROTH S15A1.0/12   S15A1012

REXROTH S15A0012 **NNB**

Rexroth RV-40-10/12 Carbon Steel Check Valve 2" 350Bar Hydraulic 2-1/2x12 Thread

REXROTH RUNNER BLOCK/BALL RAIL MNRR16517320

REXROTH RUNNER BLOCK MNR: R162219322 NIB

Rexroth Runner Block for Roller Rail System R165112320

REXROTH RUNNER BLOCK BALL RAIL R166189410 NIB

REXROTH RUNNER BLOCK BALL RAIL R165382320 NIB

REXROTH RUNNER BLOCK BALL RAIL LINEAR BEARING 1622-114-20 ~      in box

Rexroth Runner Block Ball Rail 1623-494-10       #15654

REXROTH RUNNER BLOCK 1651-414-20 *     IN BOX*

REXROTH RUNNER BLOCK (PRE GREASED) R1651394 *     IN BOX*

REXROTH RUNNER BLOCK (PRE GREASED) 108761220 *LOT OF 4*

REXROTH RüCKSCHLAGVENTIL Z 2 FS 6

REXROTH RS232 PRO-PAC MODULE R911170440-102 Model 191

REXROTH RR0031000815K    RR0031000815K

REXROTH RR00010586     RR00010586

REXROTH RR00010585     RR00010585

Rexroth RPBNHC110G10H1712 Hydraulic Filter

REXROTH ROTAIR BLOCK VALVE P-067774-00003 * SEALED*

REXROTH ROD EYE 16-200-39681-6 *     IN BAG*

REXROTH RMG42000 PRO#1050

REXROTH RKL4302/003.0 MOTOR POWER CABLE SHIELDED RECEPTACLE FEMALE 3M

REXROTH RKG4200/003.0 MOTOR FEEDBACK CABLE 3M 1

Rexroth RKG-4200 Leitung L = 4 m ungebraucht!

Rexroth RKG-4200 Leitung L = 4 m

REXROTH R-IB-IL-SCN-6-SHIELD    RIBILSCN6SHIELD

REXROTH R-IBILSCN-12-ICP    RIBILSCN12ICP

REXROTH R-IB-IL-DOR-LV-PLSET    RIBILDORLVPLSET

REXROTH R-IB-IL-24SEG/F   RIBIL24SEGF

REXROTH R-IB-IL-24SEG/F    RIBIL24SEGF

REXROTH R-IB-IL-24SEG/F     RIBIL24SEGF

REXROTH R-IB-IL-24-PWR-IN-PAC    RIBIL24PWRINPAC

Rexroth R-IB IL24 DI 8-PAC MNR: R911170751-101 Module-ID: 190 -     -

Rexroth R-IB IL DO 32/HD-PAC R-IBILDO32/HD-PAC NIB

Rexroth R-IB IL 24 DO 4-PAC R-IBIL24DO 4-PAC R911170755-101 sealed

Rexroth R-IB IL 24 DO 4-PAC R-IBIL24DO 4-PAC R911170755-101

Rexroth R-IB IL 24 DO 4-PAC / MNR: R911170755-101

REXROTH R-IB IL 24 DO 32/HD-PAC R911170768-101 PLC Extension Module versiegelt

Rexroth R-IB IL 24 DO 16 Digitales Ausgangsmodul ungebraucht!

REXROTH R-IB IL 24 DI 4-PAC DIGITAL OUTPUT MODULE 24VDC

REXROTH R-IB IL 24 DI 4-PAC DIGITAL INPUT MODULE 24V 40MA 1AMP

REXROTH R-IB IL 24 DI 2-PAC DIGITAL INPUT MODULE,     

Rexroth RF-FLS IB M12 DI 8 M12 -     -

REXROTH RF04-09 305013 SN299310-03898 A04 CIRCUIT BOARD ATTACHMENT

REXROTH REXROTH LINEAR-SET MNR R108123000 1' 1/8 DIAMETER,     

REXROTH REX ROTH HYDRAULIC VALVE MODEL 4WE6D51/NZ4 (B)

REXROTH REX ROTH HYDRAULIC VALVE MODEL 4WE6D51/NZ4

REXROTH REPLACEMENT PART KIT SUP-M01-DKCXX.3-040 *ORIGINAL PACKAGE*

REXROTH REPAIR KIT 63MM BORE CYLINDER SEALS 4503418400

REXROTH REPAIR KIT 1827 008 817 *ORIGINAL PACKAGE*

Rexroth REL0753 E48408 AWM STYLE 21223 SERVO KABEL 2,5 m A/B 80 C 600V FT1

REXROTH REGULATOR W/GAUGE 0 821 300 054 *     OUT OF BOX*

REXROTH REGULATOR PR7560-21004 4 90

Rexroth Regulator PR7560

REXROTH REGULATOR PR-007818-00010 NIB

Rexroth Regulator C15 5351420200 & base 535122000

Rexroth Regulator 0821302500 (7290) *NIB*

Rexroth REG0748 E48408 AWM STYLE 20317 SERVO KABEL 2,5 m A/B 80 C 300V FT1

Rexroth REG C15I Regulator