6AV6645-0DC01-0AX0在此需特別說(shuō)明的是，此時(shí)易產(chǎn)生如下誤解：既然LTM開(kāi)關(guān)已釆用“先斷后通”的切換方式，似乎就沒(méi)有必要再要求送到“負(fù)載自動(dòng)切換開(kāi)關(guān)”上的兩路交流電源一定是處于“相互同步入鎖”狀態(tài)之下。然而，回答是原否定的。其原因是：為確保信息網(wǎng)絡(luò)的安全運(yùn)行（注：網(wǎng)絡(luò)設(shè)備允許的瞬間供電中斷時(shí)間為20ms左右），“負(fù)載自動(dòng)切換開(kāi)關(guān)”的切換時(shí)間被限定在4-5ms左右。根據(jù)可控硅的工作原理，對(duì)于原來(lái)處于導(dǎo)通狀態(tài)的可控硅來(lái)說(shuō)，一旦它被置于觸發(fā)導(dǎo)通狀態(tài)之后、即使把送到它的柵極上的“觸發(fā)脈沖”撤除掉后、它將繼續(xù)處于導(dǎo)通狀態(tài)、直至到輸入電源的電壓下降到“過(guò)零點(diǎn)”為止。對(duì)于呈現(xiàn)電感性的供電線路而言，還要求流過(guò)可控硅中的“滯后電流”而言，還要求下降到可控硅的截止電流以下。因此，對(duì)于50Hz的供電電源來(lái)說(shuō)，仍有處于“優(yōu)先供電通道”上和”備用電源供電通道”上的兩對(duì)SCR可控硅同時(shí)處于導(dǎo)通狀態(tài)的可能性（其重疊導(dǎo)通時(shí)間在0-5ms的范圍之間）。正是基于上述原因，確保UPS雙總線輸出系統(tǒng)的安全運(yùn)行所需的條件仍然是：兩路交流電源應(yīng)該處于”相互入鎖”狀態(tài)之中。

6AV6645-0DC01-0AX0
MITSUBISHI Melsec PLC Controller FX-128MR

LIGHTSAND SAN COMMUNICATIONS BOARD 200-00000-02

Nikon NSR-S202A Camera Switcher NVC8-EX-XB

RADVISION L2W-323V Conferecing Unit L2W-323

ORBOTECH SCHUH MOTOR CONTROLLER CARD V2.0

TELEDATA RCPU 11/00 MODULE

KONTRON CTM80-2 REAR I/O T6701AC FOR DT64/CP6010/CP6000

LIGHTSAND SAN COMMUNICATIONS S-155 BOARD 200-00002-01

NUDAM ND-6013 RTD INPUT MODULE 3 CHANNEL

RADVISION MCU-323/20 Conferecing Unit MCU-323

DATAKINETICS DSC100 SERIES MODEL - DSC110A/02

Yamatake Honeywell SDC40 SDC40J C40J8V0AS050D0

KOLLMORGEN ERH-26 200 WATTS REGEN RESISTOR

10 PICOLIGHT PL-XSL-SC-LF3-11 SINGLE MODE TRANSCEIVERS

CLEMESSY ANALYS EQUIPMENT SML 157-01

KONTRON PEP CP602 CPU BOARD FOR CompactPCI SYSTEM CP600

MATROX Gen/pro 721-0201 GP60/F/64/F/64 

LSI Logic Mylex A170-1-32NB AcceleRAID 170 Ultra160 NEW

TOPWARD ELECTRONICS TMV-360A AC VOLTMETER MINT

DALSA CORECO iMAGING X64-AN QUAD ANALOG FRAME GRABBER

SINO SDS2-2MS DIGITAL READOUTS SDS2MS

TELRAD TLV122AA MODULE

WAVETEK 5820A CROSS-CHANNEL SPECTRUM ANALYZER

LIGHTSAND SAN COMMUNICATIONS BOARD 200-00001-01

ORBOTECH SCHUH I/O CONTROLLER CARD V2.2

GILAT LNB LN-5353-10 KU-BAND PART OF AN-3432-10 NEW

DELTA VFD007L21B AC DRIVE VFD-L SERIES 0.75kW

MOTOROLA MVME 334A VME BOARD 01-W3726B MVME334A

KONTRON PEP CP610 CPU BOARD FOR CompactPCI SYSTEM CP600

TELRAD TLV121AA 120OHM MODULE

Vsecure Technologies NetProtect LG100 Enterprise

IKO LINEAR COMPACT BALL SPLINE LSAGF 25 C1 R300 T1 S2 

ROHDE & SCHWARZ TV DATA DISTORTION METER 347.3515.03

GILAT KU-BAND ODU TRANSMITTER ANO950KU ANO 950 KU NEW

GENERAL STANDARDS CORP. PMC-SI104-ECI3 BOARD

SONY PCS-P600P MULTI MEDIA TERMINAL PROCESSOR

ROKAR 125840-7001 MILITARY GPS CARRIER

INTEL RAID CONTROLLER SRCU32U 128MB DUAL CHANNEL NEW

RODENSTOCK SCITEX S-3 4.9/67 

Sun Microsystems CP2080-500 Netra CP2080 cPCI Blade

PowerDsine 6512 PD-6512/AC/M 12 Port PoE Midspan NEW

Sun Microsystems CP2300S-650 Telecom blade Netra CP2300

PowerDsine 3524 PoE ETHERNET MIDSPAN PD-3524/AC NEW

PC COM PCI 4 PORT RS-232 INTERFACE CARD

MOTOROLA REAR I/O PEAM SLOT 1 BOARD 63-305-0018 NEW

ARTESYN KATANA 750i PowerPCprocessing blade 10003954-01

PARKER GEMINI GV DIGITAL SERVO DRIVE GV-U6E-NK

PowerDsine 6506 PD-6506/AC/M 6 Port PoE Midspan NEW

Creo Scitex Leaf PCAM READOUT LV BOARD (for DCB2 LIVE)

RODENSTOCK SCITEX S-3 5.0/110

ADVANTECH PCI-1750 DIGITAL I/O COUNTER PCI BOARD