DC Power for ™ Business-Critical Continuity DC to DC Converter MHSB20A The MHSB20A DC to DC converter from Emerson Key Features Network Power provides high reliability and n 20 amp converter designed availability. for -48V DC power applications Description n Modular hot pluggable unit The modular 20 amp MHSB20A is a high frequency DC to DC converter. Plug’n’play technology allows for easy system configuration. System capacity can be n Wide operating increased by simply plugging an additional converter into an existing converter temperature range shelf or a newly added expansion shelf — no adjustments or setup are required. n Diode protected output for true redundancy Additional Information ™ The 20 amp MHSB20A converter is designed for use with NetSure 721 and ™ NetSure 701 DC power systems as well as the 160 amp DC to DC converter shelf, MHSB160CAB. Converter MHSB20A 167D-MHSB20A / 0612 1 DC to DC Converter Technical Specifications Ordering Information DC Input Part Number Description 486800128 20 amp MHSB20A converter Nominal Voltage -48VDC 588249700 MHSB160CAB converter shelf Operating Voltage Range -42.0VDC to -60.0VDC ™ 582127000 NetSure 721 DC power system Input Current Max 13 amps ™ 582126000 NetSure 701 DC power system Input Protection If the input voltage decreases beyond a non-adjustable predetermined value, the converter circuitry shuts down, disabling the output. The con- verter will recover automatically when the DC input voltage returns within normal operating limits. Overcurrent is protected by an internal fuse. Operating Efficiency 88% nominal DC Output Output Voltage +24VDC Output Current 20 amps maximum Regulation Steady state output voltage remains within +/-0.5 volt from -42.0VDC to 60.0VDC input and 0 to 100% load Voice Band Noise The voice-frequency noise generated by the converters does not exceed 32dBrnC output noise from 5% to 100% load Wide Band Noise Does not exceed 150 mv peak-to-peak or 15 mv rms Protection Current Limiting 20.5 amps to 23 amps High Voltage Shutdown 27.6 volts to 30 volts Parallel Operation Output blocking diode Monitoring Status Alarm Visual Indicator Color Visual Indicators for Normal operation Green Converter Module Visual Indicators for Input OK Green Converter Shelf Minor Alarm Yellow Major Alarm Red Physical Characteristics Mounting Plug-in installation Dimensions (H x W x D) 4.2 x 2.3 x 11.7 inches (106.7 x 58.4 x 297.2mm) Emerson Network Power. Weight 3.2 lbs. (1.5 kg) ™ The global leader in enabling Business-Critical Continuity . n AC Power Environmental n Connectivity Temperature -40°F to 149°F (-40°C to 65°C) at full rated output n DC Power Altitude 10,000 feet (3028m) derate by 1 deg C per 1000 feet above sea level n Embedded Computing Ventilation Front to back n Embedded Power Audible Noise The converter does not produce sound levels above 60dB(A), measured 5 n Industrial Power feet in front of the converter, at the same horizontal line as the middle of n Infrastructure Management & Monitoring the converter at 25°C n Outside Plant Protection The converter detects internal temperature and reduces output power to n Power Switching & Controls maintain components within design parameters. It recovers automatically n Precision Cooling when temperature is within normal operating range. n Racks & Integrated Cabinets Safety Compliance UL recognized (UL60950) for USA & Canada, CE marked, NEBS Certified n Services ™ ™ Business-Critical Continuity , Emerson Network Power , ® the Emerson Network Power logo, Emerson and Consider it Solved are service marks and trademarks of Emerson Electric co. ™ ™ ™ ™ ™ EnergyMaster , eSure , NetPerform , NetReach , NetSpan , ® ™ NetSure and NetXtend are trademarks of Emerson Network Power Energy Systems North America. EmersonNetworkPower.com/EnergySystems (North America) EmersonNetworkPower.eu/EnergySystems (EMEA) © Emerson Network Power Energy Systems North America 2012. 2 167D-MHSB20A / 0612