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MMS3910/311-02转速冗余模块
设计完善的故障报警系统
在自动控制系统的设计中我们设计了3级故障显示报警系统,1级设置在控制现场各控制柜面板,用指示灯指示设备正常运行和故障情况,当设备正常运行时对应指示灯亮,当该设备运行有故障时指示灯以1Hz的频率闪烁。为防止指示灯灯泡损坏不能正确反映设备工作情况,专门设置了故障复位/灯测试按钮,系统运行任何时间持续按该按钮3s,所有指示灯应全部点亮,如果这时有指示等不亮说明该指示灯已坏,应立即更换,改按钮复位后指示灯仍按原工作状态显示设备工作状态。2级故障显示设置在中心控制室大屏幕监视器上,当设备出现故障时,有文字显示故障类型,工艺流程图上对应的设备闪烁,历史事件表中将记录该故障。3级故障显示设置在中心控制室信号箱内,当设备出现故障时,信号箱将用声、光报警方式提示工作人员,及时处理故障。在处理故障时,又将故障进行分类,有些故障是要求系统停止运行的,但有些故障对系统工作影响不大,系统可带故障运行,故障可在运行中排除,这样就大大减少整个系统停止运行时间,提高系统可靠性运行水平。
4、输入信号可靠性研究
要提高现场输入给PLC信号的可靠性,首先要选择可靠性较高的变送器和各种开关,防止各种原因引起传送信号线短路、断路或接触不良。其次在程序设计时增加数字滤波程序,增加输入信号的可信性。
在现场输入触点后加一定时器,定时时间根据触点抖动情况和系统要的响应速度确定,一般在几十ms,这样可保证触点确实稳定闭合后,才有其它响应。模拟信号滤波可采用图2b 程序设计方法,对现场模拟信号连续采样3次,采样间隔由A/D转换速度和该模拟信号变化速率决定。3次采样数据分别存放在数据寄存器DT10、DT11、DT12中,当最后1次采样结束后利用数据比较、数据交换指令、数据段比较指令去掉最大和最小值,保留中间值作为本次采样结果存放在数据寄存器DT0中。NEW TIMKEN 15125 cone BALL BEARING 15125
Igus DrylLin T Linear Rail Guide Rail Car TW-01-20 TW0120 New
FAFNIR 4-BOLT FLANGE BEARING RCJC 1-3/4" RCJC1-3/4" RCJC134 W/ COLLAR NIB
NEW LS SPHERICAL BUSHING PLAIN BEARING GE20ES
NEW SKF BALL BEARING 626-2RSH/LHT23 6262RSHLHT23 626-2RSH1/+10
Ingersoll Rand Condensate Valve 22410286 120V Coil 13 Watts New
NEW FAFNIR RCJ 1 7/8" FLANGE BEARING FAFNIR S1014K COLLAR
The General Bearing 77R20 New
NEW TIMKEN OUTER RACE 2523 19
NEW BARDEN PRECISION ANGULAR CONTACT BALL BEARING 204H
NEW TORRINGTON NEEDLE ROLLER CAGE BEARING M-28241-OH M-28241 M28241
NEW TIMKEN TAPERED ROLLER BEARING W/RACE 15250 15101 X-15250
DODGE 365DE 1 3/4" BORE TYPE E PILOTED FLANGE ROLLER BEARING NEW
Hub City Two Bolt Flange Bearing 1002-01903 100201903 FB160X3/4 3/4" Bore New
New Pacific Bearing Linear Pillow Block PM30C
9 Fafnir CB14A-6 roller conveyor Bearing Hexagon id
Ross 4-Way Solenoid Operated Valve 2776B3001Z 2776B3001 110/120V Coil New
MRC TRW Bearing 206SZZC ABEC1 206-SZZ 206SZZCABEC1 30X62X23.75MM New
NEW FAG 6212.C3 6212C3 METAL SHIELD BALL BEARING
FAG Single Row Ball Bearing 6305 New
Nachi Ball Bearing 1614-ZZ 1614ZZ 1614Z New
INA Thrust Bearing 2909 New
NEW NSK LINEAR GUIDE BEARING LAH35EM
NEW HIWIN LINEAR GUIDEWAY BLOCK BEARING EGW20C EG20 EG20C EGW20CC
P.T. International Insert Bearing UC208-24 UC20824 1 1/2" Bore New
NEW MCGILL CAM FOLLOWER BEARING CYR 7/8 S CYR78S "LOT OF 2"
NACHI 6210Z 482303-605-U 482303605U BEARING NEW
NEW TIMKEN TAPERED ROLLER BEARING 39585
Smith Cam Follow Bearing CR-1-1/4-S CR114S New
NEW DODGE 2 BOLT PILLOW BLOCK BEARING 210 SC2
Fafnir Aircraft Bearing KP20A New
INA Heavy Needle Bearing NA49042RS New
NSK Rubber Sealed Roller Ball Bearing 6303DU NEW
NEW MRC BEARING 5208 0001 52080001
TORRINGTON NEEDLE BEARING B-2020 B2020 NIB
NEW NDH DELCO BEARING 3201 Z99501
NEW FAG BEARING 6305
INA Thrust Bearing 2912 New
NEW DODGE PLASTIC COMPOSITE PILLOW BLOCK BEARING SC 1-1/4 206 1-1/4" BORE
NEW SKF SEALED BEARING 6313-2Z/C3 63132ZC3
NEW KOYO BEARING 62062RDC3 62062RDC3
NEW NTN SINGLE ROW DEEP GROOVE BALL BEARING 6205LLBC3/5C 6205C3 6205LLBC35C
FAFNIR BEARING S1KDD7 NIB
Timken Bearing Cone 15123 made in USA New
NEW SKF ROLLER BEARING 406271
NEW NICE BEARING 3016DCTN 3016
NEW MRC BEARING 206S