Liquid flow through cooling chassis accommodates up to six boards
Designed to accept up to six 6U VPX modules on a one inch (25.4mm) pitch, Elma Electronic’s VITA 48.4 OpenVPX chassis incorporates either a built-in power supply or a VITA 62 plug-in power module.
The VITA 48.x family of standards covers multiple cooling approaches. Ratified in July 2018, VITA 48.4 Liquid Flow Through (LFT)standard defines the basic dimensions, heat exchanger, mechanical assembly and chassis interface for LFT cooling for 6U VPX plug-in modules. It specifies the dimensions and tolerances to ensure mechanical inter-mateability within associated sub-racks.
An integrated liquid-to-air heat exchanger on the development platform provides the needed fluid for cooling via quick disconnect (QD) coupling assemblies. The plug-in modules use liquid flowing through a core heat exchanger located within the heatsink of the module to cool the electronic components on the circuit boards. The QD coupling assemblies allow the connection to a chassis coolant inlet and outlet.
The chassis’ built-in heat exchanger uses either water or a high flow rate water/glycol mixture to provide a cooling capacity of 500W. For system monitoring, a flow indicator shows whether liquid is circulating.
Optional backplanes can be built with wider slot pitches of 1.2 and 1.6 inch (30.48 and 40.64mm) to accommodate wider plug-in modules.
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