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 ARTESYN
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1. Safety and the Low Voltage Directive The BXA15 and BXA30 series is intended to be supplied only from a SELV (Safe Extra Low Voltage) circuit or a TNV (Telecommunications Network Voltage) power source which are insulated from the AC mains by reinforced insulation. Basic isolation, tested to 1,500VDC, for EN60950 and UL1950, is provided. SELV DC Distributed Power of 12V, 24V or 48V TNV Central Office -48V 2. Electromagnetic Compatibility Immunity Good design practice dictates that the electronic system be immune to noise interference. This practice has now been encapsulated in European law in the form of the EMC directive. It is imperative that any system on sale in the European Union meets the terms of the EMC directive and thus carries the CE mark. To simplify system compliance to the EMC Directive, the BXA15 and BXA30 have been designed to meet and comply with the necessary immunity stan- dards. Description Standard Compliance Level Electro-Static EN61000-4-2 4kV Contact Discharge 8kV Discharge Radiated Immunity IEC801-3 10V/m Fast Transients/Bursts EN61000-4-4 2kV Surges EN61000-4-5 0.5KV (40 Ohm Generator, Secondary surge protection) 3. Electromagnetic Compatibility Conducted and Radiated Interference Radiated Interference: The BXA15 and BXA30 series meet the harmonised standard EN55022 level A and CISPR22 level A. The series almost meets the requirements of level B. System performance to level B could be assured with the appropriate enclosure. Conducted Interference - Level A Internal Filter Option: All three input voltage versions of the series, 12VDC, 24VDC and 48VDC, are available with an internal filter option which meets input conducted noise per VDE0871/8-A or EN55022-A. To order a model with the internal filter, add ‘-F’ after the model number eg. BXA15- 48S12-F. Conducted Interference - Level B External Filter: The addition of an external capacitor enables the BXA15 and BXA30 products to meet VDE0871/8-B, EN55022-B and CISPR22-B conducted noise limits. The test set-up is per VDE 0877 Part 1 fig.4 with the load < 10 cm's away from the test converter. Input Voltage Recommended External Cap. 48 Volt Nippon Chemi-Con SXE series120uF, 100V ITW PAKTRON Capstick series part number 405K100CS4, 4uF @ 100V 24 Volt ITW PAKTRON 405K100CS4 12 Volt 2 * ITW PAKTRON 405K100CS4 capacitors in close parallel. For height critical applications, the ITW Paktron capacitor offers a low profile of <7mm. Note on the test set up and system grounding: The products meet input conducted noise VDE0878-B, EN55022-B and CISPR22-B 10kHz - 30MHz, if the load is not more than 10 cm's away. Tightly parallel tracks or twisted pair wiring to the load should be used. Long leads to the load could radiate common mode noise, typically above 20 MHz, back to the input power leads. Conducted emissions should be checked at a system level. If the unit fails level B at a frequency greater then 20MHz, because of system wiring, an additional external ‘Y-capacitor’ could be con- nected between input ground and output common, to locally decouple common-mode noise. This capacitor type is usually intended for use in interference suppression between line and earth. A recommended capacitor is EVOX-RIFA PME271Y422M or equiva- lent. 4. Telecom and Distributed Power Architecture Features Input Undervoltage Protection: Internally, the BXA15 and BXA30 series contain an undervoltage lockout zener circuit. The converter should not be operated continu- ously at levels between the ‘maximum guaranteed-off-threshold’ and the ‘minimum guaranteed-on-threshold.’ Nominal Input Maximum Off Minimum On Voltage Voltage Voltage 12 7.0 8.8 24 14 17 48 28 34 BXA15 and BXA30 SERIES Design Note 100 Rev. 01 - Feb. 1999 • Safety and the low voltage directive • Electromagnetic Compatibility Immunity • Electromagnetic Compatibility Conducted and Radiated Interference • Telecom and Distributed Power Architecture Features • System Protection Features • Thermal Considerations • Input Impedance Considerations PAGE 1 |
