Light Duty Racks
A & J Manufacturing Company offers a light duty electronic equipment rack-cabinet, Series 100, with a large and increasing variety of equipment installation kits. The standard light duty rack is manufactured from Series 2500 light weight extrusions, 72 inches high, 21.31 inches wide and 25.47 inches deep. It comes with a .25 inch full bottom panel, full top panel and is of modular bolted together construction. The rack-cabinet has two (2) front RETMA Bars, each having the standard EIA panel mounting hole pattern and a vertical T-Nut slot. Two (2) backup bars containing the T-Nut Slots are located in the rear. A rear EIA hole pattern is optional. A & J uses the four (4) T-Nut slots for the majority of the electronics kit mounting/interface in the rack/cabinet. The T-Nut slot dimensions from front to rear and side to side are maintained throughout the standard lines of light, medium, and heavy duty rack/cabinets to facilitate the interchangeability of installation kits. (See Sections V Alphabetical and VI Numerical for kit numbers and features). The use of the T-Nut slot provides an infinite number of vertical adjustments without the necessity of drilling mounting holes in the rack/cabinet. The RETMA Bar EIA holes have stainless steel threaded inserts that may be removed and replaced when the insert becomes stripped or worn. A continuous integral EMI/RFI gasket groove is contained in all
frame members. RETMA Bars and backup bars enable the rack/cabinet to be configured at any time to meet this requirement. The light duty Series 100 section modulus enable the open frame rack to support a three hundred pound (300#) payload and a five hundred pound (500#) payload in the enclosed cabinet configuration.
When the systems integration designer configures and locates the various system components in the racks or cabinets, an effort should be made to keep the center of gravity (CG) dimensionally below the middle of the rack and about the center axis.
An X Brace with a front trimplate is included as a standard feature in all 100 Series delivered racks and cabinets to provide torsional stiffness and to keep the vertical columns from “bowing.” If the rack or cabinet payload distribution is maintained as suggested, a deck mounted and free standing configuration without sway bracing can be achieved. A clear area of one (1.0) inch should be maintained all around the rack for free excursion under potential shock conditions. If racks or other cabinets are adjacent, they should be fastened together at the top using the A & J cabinet joining kit. Half inch (.5) diameter CRES high strength bolts should be used when mounting or installing the rack foundation to a foundatio structure. If the weight distribution results in a higher center of gravity or excessive payload, an additional X-Brace or a sway brace should be considered. When the fragility of the electronic components demand shock and vibration attenuation, the light duty rack may be configured for an isolation system.
The bolted-together construction provides the capability of disassembly of the rack/cabinet for passage through narrow openings and passageway and around tight corners. The rack/cabinet may be reassembled and still maintain its original structural integrity. When reassembling the rack-cabinet, the following type tools and torque values should be observed together with an application of components adhesive to the joining bolts.
|Bolt Size||APEX Tool Number||Torque Value(Inch Pound)||Adhesive Type (or Equivalent)|