{"product_id":"abb-6644424a1-voltage-bus-monitor-assembly","title":"ABB 6644424A1 Voltage Bus Monitor Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eABB 6644424A1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e6644424A1\u003c\/strong\u003e Voltage Bus Monitor Assembly, monitors DC supply rails within the ABB Bailey Infi 90 \/ Harmony Rack Power System (MPS3). It connects to the +5 VDC, +15 VDC, -15 VDC, and MCOM system bus connections and generates a low-true PF1 signal when any monitored voltage falls outside its specified tolerance.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e6644424A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB \/ Bailey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eVoltage Bus Monitor Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003eBailey Infi 90 \/ Net 90 \/ Harmony MPS3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e127 x 50.8 x 50.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current\u003c\/td\u003e\n\u003ctd\u003eLess than 50 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMonitored Voltage Rails\u003c\/td\u003e\n\u003ctd\u003e+5 VDC, +15 VDC, -15 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Common\u003c\/td\u003e\n\u003ctd\u003eMCOM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFault Indication\u003c\/td\u003e\n\u003ctd\u003ePF1, low-true signal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eDIN rail mounting indicated in the supplied data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHarmony Rack Power System (MPS3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDC Bus Monitoring and PF1 Fault Signaling\u003c\/h3\u003e\n\u003cp\u003eThe 6644424A1 supervises three DC supply rails referenced to the system common connection, MCOM. When a monitored voltage moves outside its specified operating tolerance, the assembly generates a low-true PF1 status signal.\u003c\/p\u003e\n\u003cp\u003eThe PF1 output provides a fault indication for integration with compatible system power monitoring logic. The supplied specifications do not define the individual voltage tolerance thresholds, signal timing, or output electrical ratings. These values should be confirmed against the applicable ABB hardware documentation before commissioning.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which voltage connections must be wired to the 6644424A1?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The documented connections are +5 VDC, +15 VDC, -15 VDC, and MCOM on the system bus bar. Verify terminal assignments and polarity against the equipment wiring documentation before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does the PF1 signal indicate?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: PF1 is a low-true status signal generated when any of the three monitored voltage rails is outside its acceptable tolerance. The supplied data does not specify the precise thresholds or response time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum specified input current?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The input current is less than 50 mA. Confirm the applicable power-system loading requirements before connecting the assembly.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eVerify that the assembly is compatible with the installed ABB Bailey Harmony Rack Power System (MPS3) configuration.\u003c\/li\u003e\n\u003cli\u003eIsolate the relevant power source and follow the site's lockout\/tagout procedures before accessing the system bus bar.\u003c\/li\u003e\n\u003cli\u003eIdentify the +5 VDC, +15 VDC, -15 VDC, and MCOM connections using the approved wiring diagram.\u003c\/li\u003e\n\u003cli\u003eInspect connectors, conductors, and mounting hardware for damage or contamination before installation.\u003c\/li\u003e\n\u003cli\u003eRoute signal wiring away from high-current switching conductors where practical. Maintain the equipment manufacturer's specified wiring separation and grounding practices.\u003c\/li\u003e\n\u003cli\u003eInstall the assembly on the designated DIN rail or mounting arrangement and secure all connections according to the applicable hardware instructions.\u003c\/li\u003e\n\u003cli\u003eRestore power following site procedures and verify the monitored supply rails and PF1 status using approved commissioning methods.\u003c\/li\u003e\n\u003cli\u003eDo not infer voltage tolerance thresholds or PF1 output ratings from the nominal rail voltages. Obtain these parameters from the applicable technical documentation.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":52752425779485,"sku":"6644424A1","price":9.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/5387\/3181\/files\/6644424A12.jpg?v=1791545963","url":"https:\/\/www.6gcontrols.com\/products\/abb-6644424a1-voltage-bus-monitor-assembly","provider":"6G Controls","version":"1.0","type":"link"}