CM-ATR-25/35/45 Card Cage Features

Slot-by-slot customer configured card-cage allows accommodation and intermixing of wedgelock IEEE P1101.2 conduction cooled boards. IEC-297 air cooled modules or Compact PCI 1101.1/IEC/118/ CD air cooled boards.

Top and bottom I/O wiring plates can be installed on the card-cage for cable guiding, clamping, organisation & protection. Two general purpose top wiring plates and one bottom plate are supplied to support most applications.

Card-cage has dual unlimited I/O wiring capabilities per slot both through the 20mm wiring clearance in the Top Cover area and via the 35mm of clearance available between the Backplane and the Bottom Cover.

The high-profile top cover extends wiring clearance up to 35mm from the board front panel. Systems needing extra bottom wiring space (up to 50mm) may install the high profile Bottom Cover. (Ordering ref: HTC & HBC).

True military VME64x monolithic Backplane incorporates active auxiliary electronics and is custom made to match the enclosure mechanics. It is fitted with J0/J1/J2 Class 1 connectors. ½ ATR

Compact PCI monolithic Backplane is fitted with rear panel I/O on P3, P4 and P5 connectors. It is designed to match the enclosure mechanics & incorporates active auxiliary electronics (Ordering ref: cPCI).

CM front panel incorporates a ready-made general purpose set of MIL-C-38999 connectors to support a wide variety of application. See number of I/O and power pins in Chassis Specifications Guide.

Front Panel Features

A customised front panel with customer company logo, connector set and layout can be supplied upon request. See front panel user area in Chassis Specifications Guide. Requires customer drawings. (Ordering ref: UDP)

Front panel LED indicators are directly driven by the PSU & Backplane circuitry for monitoring power on/off status, system board failure, correct input voltage range, VMEbus data transfers and chassis over/under temperature.

Connector Customization
A wide variety of military standard front panel connectors are available. This allows for custom layouts and configurations per client specifications. The chassis panel can be user configured to fulfil specific system requirements where our customers specify the silkscreen, layout, type and quantity of panel connectors and other devices (ETI, breakers, etc.).

The placement of LED indicators and connector captions are customized per the requirements setout by our customers. CM offers as standard a recommended set of circular MIL-C-26482 or MIL-C-38999 connectors that are well suited for a variety of applications. A blank front panel is also available.

Half ATR CM Computers engineering facility employs the very latest in CAD/CAM design tools to provide the highest quality and finish of products to our customers.

Secure Application
Chassis front panel can be equipped with SYSFAIL* magnetic latching indicator, an elapsed time indicator to monitor in-service hours, a momentary reset switch wired to VMEbus Backplane SYSRESET*, etc.

Cooling System Features

vmebus64x FAC & HES Versions. Rotron series PX2 fans rated for 28 VDC input voltage require an auxiliary DC/AC converter enclosed in a separate shielded area. Converter is integrated in chassis structure.

FAC & HES Versions. Extended capacity AC/DC high altitude PX3/PX2 military fan assembly at the rear provides direct or indirect cooling airflow up to 480 CFM. Fan input voltage is independent of Power Supply input voltage.

vmebus64x

HES Versions. Rear panel can be supplied without fans and specially adapted for vehicle air plenum or external forced air applications. Note: requires customer drawings.

Chassis Front & Rear panels are removable for inspection & maintenance. The inside wall of the rear panel integrates the fans & Power Supply board constituting a single compact unit that significantly improves DC/DC heat dissipation.

FAC & HES Versions. Rotron series PX2 & PX3 low profile standard fan finger guards are fitted in each fan ventilation opening to allow safe chassis manipulation.

FAC & HES Versions. Shielded fan finger guards fitted with honeycomb filter improve chassis EMI and EMC performance in noise sensitive applications. (Ordering ref: EMIG)

EMI/EMC Features

CM chassis internal layout is divided into 3 independent metallic partitions. I/O section at the front, card-cage in the middle & PSU section at the rear. This improves EMI/EMC performance & reduces PSU noise on system electronics.

All chassis panels & covers have conductive interior surfaces and incorporate EMI O-ring gaskets in all metal-to-metal joints to create an effective shielded Faraday cage for the enclosed electronic payload.

Two metallic wiring corridors integrated lengthwise within the chassis side panel ensure proper EMI shielding of PSU & Fan power cables. Corridors may also be used for shielding noise sensitive I/O application signals.

A NAS6204 or metric M3 bonding point can be installed on the front panel to allow chassis external grounding. Additionally there are six specific M3 thread terminals fitted in the inside of the chassis structure for general grounding purposes.

Mechanical Features

vmebus64x All chassis parts are precision machined by CNC in aeronautical aluminium in order to achieve an ultra compact lightweight metal structure with no burrs or sharp edges and an outstanding external finish throughout.

As an alternative to classis front panel NAS-622 steel hooks, enclosure mounting/fixing to base easily accomplished through a set of M4 fixing screws fitted at the chassis base structure.

ATR power supply

Keeping Cool
Enclosure sidewalls and rear panel are externally finned to decrease weight up to 50% without sacrificing mechanical performance. Fins also improve heat dissipation through free air natural convection.

HES Versions. Heat Exchanger Top Cover has identical design and operation as heat exchanger sidewalls, increasing cooling performance by approximately 35% with respect to the basic chassis model, (Ordering ref: HETC).

Chassis are equipped with NAS_622 hooks on the front panel and stainless steel centering plates (pin receptacles) at the rear. Often used threads have stainless steel helicoils to withstand severe shock and vibration.

A practical retractable carrying handle is fitted to the chassis front panel. An additional retractable handle is also incorporated on the CM-ATR-45 rear panel due to its increased size and weight.

Well suited for military applications. CM mounting trays offer low weight, minimum outline dimensions, fast enclosure insertion & removal capability and easy installation on vehicle’s hull.

All chasssis external surfaces are painted with a 3-layer military grade epoxy paint with primer (paint sample is supplied upon request). Most prevalent standard colours are Black(B) and Navy Grey (G).

Define Your Application Colour
A wider variety of special paint colours such as Blue (BLU), Red (R), Green (GN), Army dark Earth (E), Platinum (PT), White (W) and Yellow (YW) are available upon request to suit specific applications. (Ordering ref: Colour Code).

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