在對處于正遷移狀態(tài)差壓變送器使用過程中的測量準(zhǔn)確度進(jìn)行判斷時，將會遇到以下兩種問題：一是儀表輸出錯誤，如果安裝正常的操作順序，應(yīng)該先對差壓變送器三閥組的正負(fù)壓測量時進(jìn)行關(guān)閉，然后進(jìn)行平衡閥打開和放空儀表堵頭操作，4mA極限值應(yīng)該遠(yuǎn)遠(yuǎn)高于儀表輸出值，倘若儀表輸出值大于極限值，那么則說明運(yùn)行裝置存在堵塞現(xiàn)象，最有可能發(fā)生故障的位置有三閥組和正壓室引線；二是遷移量或者是零位顯示不正常，如果將正壓室取壓點(diǎn)和放空開關(guān)依次進(jìn)行關(guān)閉、打開操作后，儀表輸出正常的情況下應(yīng)該顯示4mA，那么在遷移量或者是零位都較小時，儀表輸出值將會明顯低于4mA，反之，倘若儀表輸出值大于4mA，此時零位或者是遷移量也會隨之升高，此外，隔離液外漏或者是未裝滿會導(dǎo)致正負(fù)壓室有隔離液滲入現(xiàn)象的發(fā)生繼傳統(tǒng)的接觸器、繼電器等電氣控制系統(tǒng)之后，性能強(qiáng)大、功能豐富的工控裝置PLC（可編程控制器）成為當(dāng)下電工技術(shù)的新寵，用廖常初老師的話講——現(xiàn)在的電工工作人員如果專業(yè)知識架構(gòu)中，沒有一定的變頻器、PLC等工控裝置的技術(shù)儲備，幾乎是無法勝任本職工作的！那么今天我們就來聊一下PLC電源用線方面的相關(guān)知識，大家可不要小看這個問題，要知道實(shí)際工作中PLC發(fā)生死機(jī)、誤動作等故障現(xiàn)象，有近一半的原因正是由于PLC電源質(zhì)量欠佳所造成的！
①、PLC的供電電源線應(yīng)取自電壓較穩(wěn)定的干線或單獨(dú)引自配電點(diǎn)，以此來確保PLC供電質(zhì)量。如果電網(wǎng)電壓波動較大（如含有大功率負(fù)載），應(yīng)考慮加裝具有穩(wěn)壓功能的UPS裝置。
②、PLC的電源線最好采用具有一定抗干擾能力的雙絞線，其截面不應(yīng)低于2mm2（部分歐美機(jī)型要求不得低于4mm2）。此外在配線過程中，PLC的I/O、負(fù)載等應(yīng)盡可能單獨(dú)的電源線供電，不得從PLC電源輸入線上并接。
③、當(dāng)電源中噪聲過大時（多由于電網(wǎng)內(nèi)變頻器等裝置污染所致），對PLC供電應(yīng)采用隔離變壓器，阻止噪聲干擾進(jìn)入PLC。
④、在采用隔離變壓器和低通濾波器時，PLC電源線應(yīng)先經(jīng)隔離變壓器→低通濾波器后再接入PLC。若所用隔離變壓器采用雙隔離技術(shù)時，一次側(cè)屏蔽層應(yīng)接中線，以便隔離進(jìn)線端的電磁干擾；二次側(cè)屏蔽層與PLC系統(tǒng)控制柜要共地連接，同時隔離變壓器二次側(cè)輸出線不得接地！
⑤、為防止電網(wǎng)的浪涌過電壓竄入PLC造成其損壞，可在PLC的電源輸入端接入壓敏電阻、浪涌保護(hù)器等吸收過電壓元器件，并使所用元器件的接地端和PLC的接地線分開接地。

Baumuller BUS61-20/30-54-?M-02 Drive BUS61203054M (UEX)
Article #352324, BUS61-VC-AC-10?69

Indramat DKS1.1-W100A-DL?01-00 AC Servo Drive 100A (UVG)

Baumuller BUS6-VC-AC-0069 Sercos Controller (UEX)
Art. #326342 BUM64F-300/390 BUM64F300/390 BUS6VCAC0069

G.E. 5KS365SS955D8 AC Motor 30HP/460V -FACTORY NEW-

Allen Bradley 1394-SJT22-T-RL 1394SJT22TRL Drive (UEX)
Has Latest Firmware Version 3.9A, Series A

Mitsubishi FR-Z320-7.5K-UL Freqrol Inverter (UEX)

Sepro S900-II Robot Controller Operator Panel (UEX)

Varian 990-CLD Auto Line Leak Detector GGL9000305 (UEX)

Van Dorn/Demag Pathfinder 2500 Operator Station (UGC)

AEG/Modicon BBC-43C Computrol PC Controller (UVG)

AEG/Modicon BCC-47 Computrol PC Controller (UVG)

Columbus McKinnon Lodestar Model 2 2-Ton Chain Hoist

Fanuc A06B-0827-B301#?3000 AC Servo Motor -REFURBISHED-

Fanuc A06B-0317-B272#?7076 AC Servo Motor -REFURBISHED

Fanuc A06B-0502-B372#?7076 AC Servo Motor -REFURBISHED-

Modicon PC-E984-480 PLC Controller (UVG)

Square D/Telemecanique ATS46C25N Starter 257Amp (AS-IS)

Emerson AX-2000-00-00-0?00 Axima 2000 2-Axis Drive (UEX)
Part #960369-01, AX2000

Square D/Symax 8020-SCP-423 Processor Series E (UGC)
8020SCP423, Model 400, Rev 4.00

Beijer Electronics E-700 PLC Operator Panel E700 (ULN)
Type 02440G, No. 0237-002

Fanuc A06B-0313-B672#?0008 AC Servo Motor -REFURBISHED

Modicon 120-147-002 AC Servo Motor *REFURBISHED*

Fanuc A06B-0331-B784#?7075 AC Servo Motor -REFURBISHED-

Square D/Symax 8020-SCP-523 Processor Series I (UGC)
8020SCP523, Model 500

Square D/Symax 8020-SCP-523 Processor Series M1 (UGC)
8020SCP523, Model 500, Rev 9.00

Modicon AS-506P-008 CNC Memory Board Rev C15 (UEX)

Modicon AS-P140-213 Programmer ASP140213 (UGC)

Automation Intelligence (AI) EPC-26A CPU Card (UEX)
Medar ABB Radisys Medweld

Automation Intelligence EXM-15A SERCOS Comm Modul (UEX)
Medar ABB Radisys Medweld

Modicon/Gould AS-P453-621 Remote I/O Module (UVG)

Modicon/Gould AS-P453-632 Remote I/O Module (UVG)

Fanuc A06B-0514-B672#?7008 AC Servo Motor -REFURBISHED-

Stanley 21A101502 Q4001N GAMMA Control, Devicenet (UEX)

Demag KBA112B6 & KBA90B6 AC Motors 4.7HP & 2.0HP

G.E. 5KS404VS340D8 AC Motor 60HP/460V -FACTORY NEW-

US Electric H50E1FZ-P AC Motor 50HP/460V *FACTORY NEW*

Robotron 503-7-0324-01 S-400 Cascade Module (UVG)

Demag KBA112B4 AC Motor 5.6HP/230V/460V -REFURBISHED-

ABB D-1DF10007 Operator Panel 10.5″ LCD (ULN)

ABB DF10CT133128SS3?2T Operator Panel 10.5″ LCD (ULN)

ABB DF10CT266128SS3?2T Operator Panel 10.5″ LCD (ULN)

ABB DF10CT266128SS6?4T Operator Panel 10.5″ LCD (ULN)

Modicon 110-222 Servo Controller 410-2 Rev W (UVG/NR)

Magnetek/Yaskaw?a GPD506V-B034 AC Drive 25HP/460V (UEX)

Square D/Symax 8020-SCP-423 Processor Series C2 (UGC)
8020SCP423, Model 400, Rev 3.40

Motoman 131750-4 Welding Interface Panel Rev. 16 (UEX)

Modicon/Gould AS-P453-632 Remote I/O Module (UGC)

UniOP EK16L Operator Panel/Workstati?on 6ZA985-7 (UEX)

Square D/SyMax 8030-PS70 Power Supply Series F1 (UGC)

US Electric N11N2460029C-03?R001 AC Motor 75HP/460V *REF

US Electric N11N2460029C-10 AC Motor 75HP/460V *REFURB*

Texas Instruments PM550-210 Power Supply PM550210 (UVG)

Schneider Automation PC-E984-265 TSX Compact CPU (NEW)

Square D/Symax 8020-SCP-423 Processor Series B4 (UGC)
8020SCP423, Model 400, Rev 1.10

Schneider Automation PC-E984-265 TSX CPU Module (NEW)

Modicon/Cyberli?ne 110-144 Power Supply PLS4 (UVG)

Texas Instruments PM550-200 Power Supply PM550200 (UVG)

Gettys/Modicon 120-087-306 Servo Motor CGD27-130TB *NEW

Modicon AS-4863-026 Sandwich Pack Processor Board (UGC)

Modicon AS-516P-002 Processor Board (AIND/UVG)

Texas Instruments PM550-210 Power Supply PM550210 (UGC)

Modicon AS-521P-111 Processor Board (AIND/UVG)

Yasnac JZNC-OP37 RX CRT Operator Panel #DF8100622 (UGC)

Demag KBA71A4 & KBA80B4 AC Motors 2.1HP & .78HP

ABB 3HAB8101-8/08Z Servo Drive Module DSQC-346G (UVG)

ABB 7004200 S4PC Tophat Operator Panel 10.5″ LCD (UEX)

Lincoln CF4G40U64 AC Motor 40HP/460V *FACTORY NEW*

Lincoln EVDCCF6P7.5UD64?L AC Motor 7.5HP/460V *NEW*

Modicon AS-4863-026 Sandwich Pack Board (AIND/UVG)

GE Fanuc IC600CP630K PLC Rack (No CPU module) (UGC)

Allen Bradley 2711-NK1 PanelView Keypanel Spare Part
P/N 46715-446-01, Series A, Revision B

Modicon/Gould AS-J474-001 Series 484 Slave Modem (UVG)

GE 6KAF343015ESA1 Inverter 15HP (UEX)

ABB 7004200 S4PC Tophat Operator Panel 10.5″ LCD (UGC)

Modicon/Gould AS-J474-001 Series 484 Slave Modem (UGC)

Schneider Automation PC-E984-265 TSX CPU Module (UEX)

ABB 3HAB8801-1/2B Axis Control Board DSQC-266G (UVG)

AEG/Gettys 120-166-200 Brushless Servo Motor (ULN)

Allen Bradley 1770-FAC PLC-2 Keyboard Series B (ULN)

Allen Bradley 1770-FE PLC-3 Keyboard Series B (UVG)

Lincoln CHCCN6G1UUC64L AC Motor 1HP/460V *FACTORY NEW*

Lincoln DVNCCF4G15U64L AC Motor 15HP/460V *FACTORY NEW*

Rexroth-Bosch VT-VSPA2-1-20 Analog Amplifier Card (UVG)
Full P/N VT-VSPA2-1-20/?V0/T1, Model #R901002090

Modicon/Gould AS-P421-012 Auxilliary Power Supply (UGC)

Modicon/Gould AS-P452-012 Auxilliary Power Supply (UGC)

TI 405-8ADC-1 8-Channel Analog Input Module (UVG)

Cutler Hammer D100CA40 Series A1 PLC Controller (NIOP)

ABB 3HAB7215-1/07 Panel Module DSQC-331 (UEX)

Modicon AS-B579-001 High Speed Counter w/Wire Arm (UVG)

Baldor 10M36W436M AC Motor, 10HP/460V/3-PH *FACTORY NEW

G.E. 5KS254SAB168 AC Motor 15HP/460V -FACTORY NEW-

ABB ACS500 5HP Drive ACS501-003-4-00?P2 Series B (UEX)

ABB YB560103-CE/24 Axis Control Board DSQC-236T (UVG)

Indramat TRANS 01.7/1/OP01 Servo Control/Operato?r (UEX)
TRANS01.7/1/OP?01 1.7/1/OP01 Operator Panel

Square D/Symax 8020-SCP-523 Processor Series C.M1 (NR)
8020SCP523, Model 500, Rev 9.00

Lincoln AVHCF6P10U64L AC Motor 10HP/460V *FACTORY NEW*

Pacific Scientific E41RLHA-LSS-NS-?02 Stepper Motor *NEW

Sew Eurodrive DFT71C2BMG05HR AC Motor .5HP/230-460V NEW

Sew Eurodrive DFT90S12/2BMG2H?FTF AC Motor .93HP *NEW*

Texas Instruments PM550-210 Power Supply (AS-IS)

Modicon AS-506P-008 CPU Board 584A 8K (AIND/UVG)

專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊