設(shè)計完善的故障報警系統(tǒng)

　　在自動控制系統(tǒng)的設(shè)計中我們設(shè)計了3級故障顯示報警系統(tǒng)，1級設(shè)置在控制現(xiàn)場各控制柜面板，用指示燈指示設(shè)備正常運行和故障情況，當(dāng)設(shè)備正常運行時對應(yīng)指示燈亮，當(dāng)該設(shè)備運行有故障時指示燈以1Hz的頻率閃爍。為防止指示燈燈泡損壞不能正確反映設(shè)備工作情況，專門設(shè)置了故障復(fù)位/燈測試按鈕，系統(tǒng)運行任何時間持續(xù)按該按鈕3s，所有指示燈應(yīng)全部點亮，如果這時有指示等不亮說明該指示燈已壞，應(yīng)立即更換，改按鈕復(fù)位后指示燈仍按原工作狀態(tài)顯示設(shè)備工作狀態(tài)。2級故障顯示設(shè)置在中心控制室大屏幕監(jiān)視器上，當(dāng)設(shè)備出現(xiàn)故障時，有文字顯示故障類型，工藝流程圖上對應(yīng)的設(shè)備閃爍，歷史事件表中將記錄該故障。3級故障顯示設(shè)置在中心控制室信號箱內(nèi)，當(dāng)設(shè)備出現(xiàn)故障時，信號箱將用聲、光報警方式提示工作人員，及時處理故障。在處理故障時，又將故障進行分類，有些故障是要求系統(tǒng)停止運行的，但有些故障對系統(tǒng)工作影響不大，系統(tǒng)可帶故障運行，故障可在運行中排除，這樣就大大減少整個系統(tǒng)停止運行時間，提高系統(tǒng)可靠性運行水平。

　　4、輸入信號可靠性研究

　　要提高現(xiàn)場輸入給PLC信號的可靠性，首先要選擇可靠性較高的變送器和各種開關(guān)，防止各種原因引起傳送信號線短路、斷路或接觸不良。其次在程序設(shè)計時增加數(shù)字濾波程序，增加輸入信號的可信性。

　　在現(xiàn)場輸入觸點后加一定時器，定時時間根據(jù)觸點抖動情況和系統(tǒng)要的響應(yīng)速度確定，一般在幾十ms，這樣可保證觸點確實穩(wěn)定閉合后，才有其它響應(yīng)。模擬信號濾波可采用圖2b 程序設(shè)計方法，對現(xiàn)場模擬信號連續(xù)采樣3次，采樣間隔由A/D轉(zhuǎn)換速度和該模擬信號變化速率決定。3次采樣數(shù)據(jù)分別存放在數(shù)據(jù)寄存器DT10、DT11、DT12中，當(dāng)最后1次采樣結(jié)束后利用數(shù)據(jù)比較、數(shù)據(jù)交換指令、數(shù)據(jù)段比較指令去掉最大和最小值，保留中間值作為本次采樣結(jié)果存放在數(shù)據(jù)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

Link Belt Spherical Roller Bearing Double Row 22217LBK/W33/C3 22217LBKW33C3 New

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