the ldx - b20 is a microprocessor controlled buffer unit rated 20 a usable in 12 v, 24 v, 48 v and 72 v systems. the ldx - b20 monitors the voltage coming from a dc power supply and in case of failure a capacitor bank is us ed to keep the output regulated for at least 300 ms at full load . ? wide voltage range 12 - 85 v dc ? compact size ? dc bus voltage self - tracking ? boost max peak power of dc supply ? multiple protections ? digital regulation ? reliable topology, based on standard electrolytic capacitors ? > 150 joules energy storage ? integrates low power step - up (boost) converter to charge the capacitor bank ? integrates 20 a step - down (buck) converter to discharge the capacitor bank at an adjustable output voltage in case of mains failure ? relays dry contact and an opto - isolated input for inhibit ? integrated safety circuit that disconnects the capacitor bank in case of internal failure ? parallelable for power and backup time increase
2 ldx - b20 tech.support@psbel.com ldx - b20 12 / 24 / 48 72 v dc (1 2 - 85 v dc ) max. 2 a v in C 1 v (12 / 24 / 48 / 72 v dc C 1 v) 20 a @ < 48 vdc 16 a @ > 48 vdc input voltage (range) auto detection 12 / 24 / 48 72 vdc (12 - 85 vdc) input current f or capacitor charging , voltage dependent max. 2 a charging time v oltage dependent < 40 s output voltage uin C C C operating m odes auto: s enses the input voltage and supplies the load when the voltage drops manual: f ixed output voltage (12 / 24 / 48 / 72 v dc ), user settable by front button control cpu operating temperature - 40c to + 7 0c storage temperature - 20c to +8 0c humidity non - condensing 5 - 95% r.h. isolation dc bus / ground isolation 0.75 kv dc cooling method natural convection cooling safety standards & approvals ul508 (reference) en60950 (reference) emc standards emission en55022: 2010 (cispr22) en55011: 2009 /a1:2010 class a class a immunity en61000 - 4 - 2:2008 en61000 - 4 - 3:2006 /a2:2010 en61000 - 4 - 4:2012 en61000 - 4 - 5:2014 en61000 - 4 - 11:2004 /a1:2010 level 3 level 3 level 3 level 1 level 2
ldx - b20 3 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 2016 bel power solutions & protection bcd.00 855 _ aa protection degree en60529:1989 / a:2013 ip20 vibration s inusoidal iec 60068 - 2 - 6:2007 5 - 17.8 hz: 1.6 mm; 17.8 - 500 hz: 2g 2hours / axis ( x, y, z ) shock iec 60068 - 2 - 27:2008 30 g 6 ms, 20 g 11 ms; 3 bu mps / direction, 18 bumps total notes: ? technical parameters are typical, measured in laboratory environment at 25c. ? for more details, performance and description regarding all parameters not indicated in the above tabl e, refer to user manual. ? data may change without prior notice in order to improve the product ? weight 9 0 0 g dimensions 63 x 140 x 117 mm case material aluminum mounting rail iec 60715/h15/th35 - 7.5( - 15) buffer time vs. output current 0 500 1000 1500 2000 2500 3000 0 2 4 6 8 10 12 14 16 18 20 output current [a] 12 v 24 v 48 v 72 v
4 ldx - b20 tech.support@psbel.com figure 1 . mechanical dr awing input / output connection : ? dc bus + = wired in parallel with + dc ? dc bus - = wired in parallel with - dc ? i = earth ground ? inhibit = used to disable the buffering function ? backup = dry contact closed while ldx - b20 is delivering power ? ready = dry contact closed when the internal capacitors are charged at least at 1/2 of their maximal energy and the inhibit input is inactive. nuclear and medical applications - products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. technical revisions - the appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. specifications are subject to change without notice.
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