SA8281存在的另外一个问题是由初始化寄存器和控制寄存器的编程方式引起的，由于其编程共用三个暂存器R0、R1、R2，而仅靠写R3或者R4来区分将数据写入控制寄存器还是初始化寄存器，运行中控制寄存器的内容需随工作频率的变化不断更改，而初始化寄存器在开始工作时设置完成后，运行中一般不允许改变，但芯片本身并没有相应的措施保证初始化寄存器不被改写，这样在对控制寄存器的写入过程中，如果由于偶然的强干扰信号，导致写入地址低3位变为100，将导致初始化寄存器的误改写，使与工作频率等有关的重要参数改变，如果不能及时检测到这种变化，将可能使变频器长时间工作在异常状态下，而SA8281的内部寄存器只能写入不能读出，故单片机无法直接检查数据是否被误改写，为此可将R相零相位脉冲ZPPR送单片机的另一具有中断功能的外部引脚，利用单片机的片内定时P计数器不断检测SA8281的实际输出频率，并与当前设定值比较，若两者出现明显偏差，则重新设置初始化寄存器。

　　SA8281PWM芯片及其在空调风机变频器中的应用控型变频器中的应用实例。该专用变频器以MCS-51系列单片机89C52为主控芯片，采用SA8281作为三相PWM波形发生器，以IPM智能功率模块作为逆变器的功率开关器件，并带有电流型温度传感器接口及RS-485通信接口，硬件电路简单、实用。其中与SA8281相关部分如图4所示。与89C52的P0口直接相连，三条控制线WR、RD、ALE分别与89C52相应引脚相连，片选信号与P2.7相接。单片机的P1.4控制SA8281的复位引脚。考虑到89C52单片机没有非屏蔽中断，设计时将所有故障信号合并后直接送SA8281的SETTRIP引脚，以实现故障时的快速封锁，并利用TRIP信号产生中断，在中断服务程序中进行故障的处理及恢复等工作。为避免误封锁，各故障信号均加有滤波延迟电路，合并后的故障信号进一步经由单稳电路构成的窄脉冲消除电路，以消除干扰脉冲的影响。

关于介质配比的选择，人们在长期的生产实践中总结出许多配球方案图，主要有以下几种：给料粒度组成相关法、等密度法、质量直径比法、等表面积法、质量表面积比法、个数相等法、磨损补加法和产物粒度相关法。上述各种配比方法在实践中都有应用，但又存在明显差异。产物粒度相关法已被实践证明在产物粒度要求严格的特殊清况下是最理想和行之有效的方法，但该方法由于汁算过程比较复杂，在一般的中小型矿山企业难以采用。因此，在一定意义上还没有一种方法被普遍采用。本文就计算方法较为简单的几种配比方法进行试验研究比较。本试验主要是用相机拍摄球磨机内介质的运动状态，根据其运动状态分析球磨机内介质的运动状况，进一步研究不同介质配比在相同转速率和不同转速率下的运动情况。

　　试验样机的研磨腔体为焊接件，一端是透明的玻璃端盖（用于拍摄）且只模拟介质在二维空间里运动。在不同转速率下进行研究，每一次试验均按下述操作步马聚进行：根据钢球个数，将相应数量的钢球加到筒体中；打开变频调速和球磨机的供电电源，启动变频调速调节系统并启动球磨机，调节变频调速旋钮，直至达到要求的转速率；待球磨机启动1~2min平稳运转后，观察钢球运动情况，启动图像采集系统，拍摄多组照片以便将来选择最优的照片作为分析依据；一组试验过后，关闭球磨机电源。将钢球倒出，清洗透明端盖和研磨腔体，准备下一组试验。

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BABCOCK VL-01SP-02 NSPP VL01SP02

BAILEY CONTROLS CLC03 USPP CLC03

BAILEY CONTROLS CLC04 USPP CLC04

BAILEY CONTROLS IMAMM-03 USPP IMAMM03

BAILEY CONTROLS INPCT-01 USPP INPCT01

BAILEY CONTROLS NLIM0-1 NSPP NLIM01

BAILEY CONTROLS PHARPSPEP21013 NSFP PHARPSPEP21013

BALDOR ASM6215 NSPP ASM6215

BALDOR BSC-3015-704 NSFP BSC3015704

BALDOR BTS10-15/45-24-R-720 NSFP BTS10154524R720

BALDOR BTS10-15/45-24-R-733 NSFP BTS10154524R733

BALDOR FD2A05TR-RN20 USPP FD2A05TRRN20

BALDOR FD2A07TR-RN20 USPP FD2A07TRRN20

BALLUFF BPCAX3600-E1-48P-04-E NSPP BPCAX3600E148P04

BANNER ENGINEERING MSXLHDR7212Y NSFP MSXLHDR7212Y

BARBER COLMAN 80BB-00020-002-0-01 USPP 80BB00020000001

BARBER COLMAN 80BD-00022-202-V-00 USPP 80BD00022202V00

BARBER COLMAN 80BE-00015-101-V-00 USPP 80BE00015101V00

BARBER COLMAN 80FB-10002-001-0-02 USPP 80FB10002001002

BARBER COLMAN A-60010-00 USPP A6001000

BARBER COLMAN A-60010-109 USPP A60010109

BARBER COLMAN A-60010-403 USPP A60010403

BARBER COLMAN A-60010-506 USPP A60010506

BARBER COLMAN A-60063-302 USPP A60063302

BARDAC SLX20/51 USPP SLX2051

BARDEN BEARING 126HDBTL NSFP 126HDBTL

BAUMULLER BUS21-15/30-30-003 USPP BUS21153030003

BAUMULLER BUS21-15/30-30-004 USPP BUS21153030004

BAUMULLER BUS21-15/30-31-020 USPP BUS21153031020

BAUMULLER BUS624-45/67-54-M-001 USPP BUS624456754M001

BAUMULLER DSG45-M USPP DSG45M

BAUMULLER DSG71-S USPP DSG71S

BAYSIDE PS142-015 USPP PS142015

BAYSIDE PS180-003-SH NSPP PS180003SH

BEBCO 2001A-STD-CI NSFP 2001ASTDCI

BELOIT 315-0621-0010-0 USPP 315062100100

BENSHAW RSD6-200-6-1 USPP RSD620061

BENSHAW RSI-015-S-4DB USPP RSI015S4DB

BENSHAW RSI-020-S-4DB USPP RSI020S4DB

BENTLY NEVADA 3300-16-02-01-01-01-01-00 USPP 3300160201010101

BONITRON M334542BM00 USPP M334542BM00

BOSCH 0-515-700-003 USPP 0515700003

BOSCH SFA2004103010050 USPP SFA2004103010050

BOSCH SFA4023003004050 NSFP SFA4023003004050

BROOKS AUTOMATION T2114-01-30 NSFP T21140130

BROOKS AUTOMATION T2119-01-30 NSFP T21190130

C&D TECHNOLOGIES ARE48AC6E USPP ARE48AC6E

CABLETRON CSMIM2-32 USPP CSMIM232

CAMCO 601RDM6H24-270 USPP 601RDM6H24270

CARRIER 30HX500802 NSPP 30HX500802

CHROMALOX MXPCII30711L2F03 USPP MXPCII30711L2F03

CINCINNATI LAMB 69002-B32X25X42-KS-HSK USPP 69002B32X25X42KS

CINCINNATI MILACRON 3533-0503G USPP 35330503G

CINCINNATI MILACRON 3-533-0660G USPP 35330660G

COGNEX 200-0091-2 USPP 20000912

COGNEX 800-5714-1 NSPP 80057141

COGNEX 800-5834-1 USPP 80058341

COGNEX ISS-5100-0000 USPP ISS51000000

COLORFLOW SR1015B-62 USPP SR1015B62

COMPAQ COMPUTER 3R-A2975-AA USPP 3RA2975AA

COMPUMOTOR 01P4044 USPP 01P4044

COMPUMOTOR 6201-M USPP 6201M

COMPUMOTOR 6K-6 USPP 6K6

COMPUMOTOR 6K8-NK USPP 6K8NK

COMPUMOTOR APEX-6151 USPP APEX6151

COMPUMOTOR AT6400-AUX1-120V NSPP AT6400AUX1120V

COMPUMOTOR R-5030B-230 USPP R5030B230

COMPUMOTOR SR-1400A62-3SN USPP SR1400A623SN

COMPUMOTOR Z600-DRIVE-240V USPP Z600DRIVE240V

COMPUMOTOR Z620-MO-25 NSPP Z620MO25

COMPUMOTOR Z650-240V-50 USPP Z650240V50

CONTROL TECHNIQUES 75DSD300CAAAA NSFP 75DSD300CAAAA

CONTROL TECHNIQUES 95DMA300HAAAA NSPP 95DMA300HAAAA

CONTROL TECHNIQUES 95DSB301CAAAA USPP 95DSB301CAAAA

CONTROL TECHNIQUES 95DSC300HAAAA NSPP 95DSC300HAAAA

CONTROL TECHNIQUES 95DSD300HAAAA USPP 95DSD300HAAAA

CONTROL TECHNIQUES DXA-205 NSPP DXA205

CONTROL TECHNIQUES DXA6300 USPP DXA6300

CONTROL TECHNIQUES DXE-4120C USPP DXE4120C

CONTROL TECHNIQUES M035340 USPP M035340

CONTROL TECHNIQUES MGE-490-CONS-0000 USPP MGE490CONS0000

CONTROL TECHNIQUES MX-280-CE NSFP MX280CE

CONTROL TECHNIQUES UNI-1404 USPP UNI1404

CONVERGENT ENERGY 3230713 NSPP 3230713

COOPER BEARINGS 02BC315LX NSPP 02BC315LX

COPYPRO INC CP-2000-CRT USPP CP2000CRT

CRC EVANS AUTOMATIC WELDING WFC-100 USPP WFC100

CRC EVANS AUTOMATIC WELDING WSC-100 USPP WSC100

CTC PARKER AUTOMATION AKD-1400 USPP AKD1400

CTC PARKER AUTOMATION PWR-4000-101 USPP PWR4000101

CUSTOM SERVO MPA-100-171 NSFP MPA100171

CUTLER HAMMER 5CLS70-24R NSFP 5CLS7024R

CUTLER HAMMER 910091803 USPP 910091803

CUTLER HAMMER A201KFCA USPP A201KFCA

CUTLER HAMMER CP01038 FNFP CP01038

CUTLER HAMMER CPS100208YAN NSFP CPS100208YAN

CUTLER HAMMER D72WNOP76433WNT USPP D72WNOP76433WNT

CUTLER HAMMER D72WTSP7Z84DWNT USPP D72WTSP7Z84DWNT

CUTLER HAMMER D72WTSP7Z863WNT USPP D72WTSP7Z863WNT

CUTLER HAMMER DS90021 USPP DS90021

CUTLER HAMMER ECN1711CACC1 NSFP ECN1711CACC1

CUTLER HAMMER HJD3250 USPP HJD3250

CUTLER HAMMER HKD2400 NSFP HKD2400

CUTLER HAMMER HMDL3800F NSFP HMDL3800F

CUTLER HAMMER MKNE19374-1 NSPP MKNE193741

CUTLER HAMMER S801N66N3S USPP S801N66N3S

CUTLER HAMMER SV9F50AG-V5M0B00LM9Y4 NSFP SV9F50AGV5M0B00L

CUTLER HAMMER SVX015A1-4A1B2 NSFP SVX015A14A1B2

CUTLER HAMMER W200M4CFC USPP W200M4CFC

CUTLER HAMMER WCBS5EF USPP WCBS5EF