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3U - S - Sealed

Rugged SEALED COTS 3U ½ ATR - 5 slot. Certified per MIL-461F & MIL-810G for immediate deployment. Applications up to 80 watts. Configure Now

3U - S - Sealed

Custom COTS - Customer configurable & loaded with options: Extended bottom & top covers, front panel connectors, logos & silk screening, etc. Configure Now

3U ATR S Description

Sealed, 1" pitch, low cost dry-air 3U chassis that incorporates air re-circulation fans inside. This minimum maintenance ATR is ideal for low wattage applications where ambient air is laden with hostile or harmful contaminants.

CM-ATR-3U/S

Heat generated within the enclosure is dissipated by a combination of cold-plate conduction, radiation and free-air convection through the chassis metalwork to the ambient environment. Internal air recirculation fans ensure constant airflow across modules.

CM-ATR-3U/S

The 3U S chassis is available in a 5 slot version only (½ ATR), supporting VME, cPCI & VPX backplanes. A total PSU power of up to 825 watts may be installed. Custom modifications can be designed upon customer request.

CM-ATR-3U/S Layout

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.

Attention to I/O flexibility and easy board integration; allowing the intermixing of wedgelock IEEE P1101.2 conduction cooled boards, IEC-297 air cooled modules, Compact PCI 1101.1/IEC/118/ CD and VPX VITA 46.0/.1/.10/.3/.4/.7 air cooled boards.

3U S Performance

Dissipation:★☆☆☆

Price:★★★★

Slots / Pitch:5   1"

Sealed (Dry Air):

≤ 80W

The 3U S chassis is suitable for low wattage sealed applications that demand moderate passive cooling capabilities. This silent, fanless model is ideal for submarine, proximity to operator & deploy and forget applications.

S - Chassis Global Thermal Resistance (CGTR) coefficient:
ΔT/W = 0.32°C (½ ATR).

S - Chassis Payload Thermal Resistance (CPTR) coefficient:
ΔT/W = 0.388°C (½ ATR).

For reliable operation it is recommended the maximum Payload Power not be exceeded. Subject to operating conditions. All CM 3U ATR chassis are delivered tested, qualified and certified per Military Standards MIL-STD-461E & MIL-STD-810F.

3U Backplanes

CM 3U backplanes are low noise, full military VMEbus, VPX or cPCI-S compatible and provide fully standard bus slot & signal daisy-chain functionalities. Bus slots are tailored for 1 inch pitch standard & deliver full compatibility with 0.8 inch pitch 3U modules.

CM-ATR-3U/ - Backplanes

CM 3U enclosures incorporate a versatile universal ‘MCS’ slot mixed card-cage that accepts all off-the-shelf Conduction Cooled and Air Cooled 3U modules.

An alternative ‘CCS’ conduction cooled card-cage is available for conduction-cooled boards only, whereby improving thermal performance.

All 3U backplanes install specific TTL logic circuitry for driving up to 8 front panel user LED indicators.

All 3U backplanes integrate a Temperature Supervisory Unit (TSU) with panel LED (over/under temperature) that controls Power Supply & Fan operation. Remote optoisolated control switches for ‘Battle-short’ & chassis PSU ‘on/standby’ are fitted as standard.

CM-ATR-3U/ - Backplanes
  • VME64x backplanes. Conduction-cooled IEEE-1101.2 & air-cooled IEC-297/IEEE.1101.1 modules.
  • VPX backplanes conform to VITA 46 / 65 / 66 / 67 (≥10 GHz Gen 3).
  • Compact PCI Serial backplanes according to PICMG CPCI-S.0 R2.0 2015 / IEEE 1101 standards.

CM 3U military backplanes allow unlimited pin I/O wiring capability. Flexible top & bottom wiring integration is facilitated by a standard 25mm bottom cavity clearance.

Class 1 military power input connectors fitted on the backplane offer shock & vibration reliability interconnectivity between chassis internal modules & allows high DC current rates with low voltage drops and minimum contact heating.

CM-ATR-3U/ - Backplanes

3U backplanes are supplied with military conformal coating. Printed circuits boards are partially coated per MIL-I-4658C. This is carried out only in areas in which coating the product does not affect VPX, VME, cPCI or I/O connectors.

All 3U models integrate the same backplane electronics for easy switch-overs, retrofits or replacement parts.
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3U S Power Supplies

3U S chassis PSUs support a wide variety of AC/DC input voltages (MIL-STD-704 & MIL-STD-1275) and customer defined DC power output combinations up to Watts. Available in 6 different versions (A-B-C-...) to suit the demand per DC Line of standard COTS open busses.

CM-PS-3U/S

All PSU models are fitted with Power Fail Monitor, remote voltage sensing, output voltage trim-up, time-delayed protection fuses, rear fan fuse and DC/DC converter remote shutdown.

To comply with MIL-STD-461G, a high capacity integrated EMI/EMC input voltage filter is fitted as standard on all 3U models. All models integrate the same PSU and backplane electronics.

Single-phase AC PSUs are fitted with a VICOR military Filter and Autoranging Rectifier Module (FARM) to provided EMI filtering, autoranging line rectification and inrush current limiting to meet MIL-STD-461E category A1b specifications for Electromagnetic Compatibility.

3U S Power Supply Unit

200VAC 3-Phase PSU versions additionally incorporate AC/DC rectifier stage prior to the VICOR FIAM front-end modules.

DC PSUs are equipped with a VICOR military Filter and Attenuator Module (FIAM). This front-end device is fitted prior to the DC/DC converters to provide EMI filtering, inrush current limiting and transient protection.

Front-end FIAM modules are protected against DC reverse polarity. An optional reverse polarity diode may be fitted in series with power connector input pin IN (+).

3U S PSUs incorporate isolated DC/DC converters and oversized hold-up capacitors to ensure proper operation during short power line failures. Outputs are protected against short-circuit, thermal-shutdown etc. PSUs are custom made to match the enclosure mechanics.

3U S Power Supply Unit

The PSU in S models is attached to a heat exchanger panel that provides both conduction and convection cooling. Internal air recirculation dissipates heat generated by the PSU through its panel via thermal conduction to the chassis frame.

Forced air that is drawn through the heat exchangers, passing over the PSU panel external fins & exhausted, removing the majority of heat.


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3U ATR S Features

3U S No Rear Fans
Fully Sealed Chassis
3U S chassis are fully sealed with no exterior exhaust fans, slient, requiring Zero maintence & replacement of parts.
3U S LED Indicators
LED Front Panel Indicators
Up to 8 front panel LED indicators for chassis monitoring; power on/off status, system board failure, input voltage, temp., etc.
3U S Front Panel
Front Panel
Custom layout with client logo, connectors & silk-screening or a general purpose panel with MIL-C-38999 connectors is supplied.
3U S Panel Covers
Product Flexibility
Optional Extended or Heat Exchanger covers can be selected for additional wiring clearance & are removable for easy maintenance.
3U S Chassis Metalwork
Chassis Metalwork
Precision machined aeronautical aluminum with MIL-DTL-5541F chromate coating. All panels & joints incorporate EMI gaskets.
3U S Mounting Tray
Mounting Tray
Low profile with quick release system offers easy insertion/removal capability, weight optimized with minimized dimensions.
3U S EMI/EMC Filter
EMI/EMC Filter
High capacity integrated EMI/EMC input voltage filter is fitted as standard on all 3U models to comply with MIL-STD-461F.
3U S Internal Air Recirculation
Air Recirculation
All 3U chassis incorporate a low profile internal fan pack to recirculate air, improving card-cage, PSU & module heat dissipation.
3U S Card-cage Slots
Card-cage Slots
Selective mechanics for either mixed (MCS: Conduction-cooled & Air-cooled boards) or (CCS: Conduction-cooled boards only).

Capabilities

  • Contaminant-free enclosure
  • Accepts Conduction-cooled 3U Modules only
  • Flexible Bottom I/O wiring
  • In-line EMI/EMC MIL-STD-461G Filter
  • Up to 80W* Total Payload Power (30ºC Delta-T)
  • Integrated Chassis Supervisory System (CSS)
  • Maintenance free operation
  • Front panel user indicators
  • Integrated Rear fan guards
  • Independent Fan & Power Supply input voltage
  • Stand alone low weight ATR
  • Internal card-cage airflow recirculation
  • Military Operating Temperature (-40°C | +85°C)
  • Silent, no noise per Grade A12, MIL-STD-740-1 / MIL-STD-1474 (54dB A-weighted)
  • Customizable to specific requirements
  • Low Profile Mounting Tray with quick release
  • Manufactured with US MIL components
* Subject to operating conditions

3U ATR S Specifications

CM-ATR-3U/S
WIDTH 153 mm
HEIGHT 225 mm
DEPTH 248 mm
WEIGHT 3.9 Kg
CGTR COEFF ΔT/W = 0.32°C
CPTR COEFF ΔT/W = 0.388°C
MAX PSU PWR 825 Watts (28 VDC 625 Watts)
PSU V-INPUT 28 VDC ±30%, 48 VDC ±30%, 72 VDC ±30%, 270 VDC ±30%, Autorange 90-132 VAC RMS & 180-264 VAC RMS 47-880 Hz, 3-Phase 200 VAC ±30% 47-880 Hz
STD BACKPLANE 3U (1" Pitch), 5-SLOT VME64X or cPCI or VPX
BOARD FORMAT CCS: Conduction-cooled slots only or MCS: Slot-by-slot user configured card-cage allows intermixing conduction-cooled ANSI-VITA 48.2 & air-cooled ANSI-VITA 48.1 boards
INTERNAL FAN 4 x 13.5 CFM (54 CFM)
FRONT PANEL AREA 125 mm x 140 mm
CM FRONT PANEL I/O 6 Power Pins (13 Amp) & 382 I/O Pins (5 Amp)
MTBF 25° GB 82,000 Hours, 65° AIC 27,000 Hours
OPERATING TEMP -40°C to +85°C Operating Temperature, -55°C to 100°C Storage Temperature
MOUNTING TRAY CM-TR-3U/S

3U ATR COTS MODELS

These highly optimized 3U chassis incorporate all proprietary technologies, features and well established mechanical & electrical solutions developed during the past 20 years.

FAC:Flow-through airflow open enclosure.

S:Standard sealed contaminant-free enclosure.

SEF-18HP:Sealed with Extended Fins + 18 Heat Pipes contaminant-free enclosure.

HES:Sealed contaminant-free enclosure fitted with 4 integrated heat exchangers as standard.

HES-FBL:Sealed, conventional front-to-back format contaminant-free enclosure fitted with 4 integrated heat exchangers as standard.

HES-FBL-HP:Sealed, conventional front-to-back format contaminant-free enclosure fitted with 4 integrated heat exchangers and heat pipes as standard.

3U ATR MIL Certificates

3U ATR Ordering Information

Generic Part Number:
CM-ATR-3U /CT /B /I /W /FP /TC /BC /CS /C
/CT Enclosure Cooling Technique
  • CM-ATR-3U/S: Standard Sealed enclosure.
/B Backplane Type
  • VME64x: Military VME64x Backplane (5 Slot 3U 1" Pitch).
  • cPCI-S: Military Compact PCI Serial Backplane (5 Slot 3U 1" Pitch).
  • VPX: VITA 46 Military VPX Backplane (5 Slot 3U 1" Pitch).
  • VPX-6: VITA 46 Military VPX Backplane (6 Slot 3U 0.85" Pitch).
/I PSU Input Power Voltage
  • 28VDC: 28 VDC Input.
  • 48VDC: 48 VDC Input.
  • 72VDC: 72 VDC Input.
  • 270VDC: 270 VDC Input.
  • 90-264VAC: Autorange 90-264 VAC @ 47-880 Hz Input.
  • 200VAC-3Ph: 200 VAC 3 Phase @ 47-880 Hz Input.
/W Power Supply Unit
  • A-475W: 28 VDC* (+5 VDC @ 40A, +3.3 VDC @ 22A, ±12 VDC @ 8A).
  • A-575W: All PSUs* (+5 VDC @ 40A, +3.3 VDC @ 22A, ±12 VDC @ 12A).
  • A-675W: 28 VDC* (+5 VDC @80A, +3.3 VDC @22A, ±12 VDC @ 8A).
  • A-775W: All PSUs* (+5 VDC @80A, +3.3 VDC @22A, ±12 VDC @12A).
  • B-450W: 28 VDC* (+5 VDC @ 20A, +3.3 VDC @ 45A, ±12 VDC @ 8A).
  • B-550W: All PSUs* (+5 VDC @ 20A, +3.3 VDC @ 45A, ±12 VDC @ 12A).
  • B-564W: 28 VDC* (+5 VDC @20A, +3.3 VDC @80A, ±12 VDC @ 8A).
  • B-664W: All PSUs* (+5 VDC @20A, +3.3 VDC @80A, ±12 VDC @12A).
  • C-475W: 28 VDC* (+5 VDC @ 20A, +3.3 VDC @ 22A, +12 VDC @ 16A, -12 VDC @ 8A).
  • C-575W: All PSUs* (+5 VDC @20A, +3.3 VDC @22A, +12 VDC @21A, -12 VDC @12A).
  • C-775W: 28 VDC* (+5 VDC @20A, +3.3 VDC @22A, +12 VDC @41A, -12 VDC @8A).
  • C-825W: All PSUs* (+5 VDC @20A, +3.3 VDC @22A, +12 VDC @41A, -12 VDC @12A).
  • D-550W: 28 VDC* (+5 VDC @40A, +3.3 VDC @45A, ±12 VDC @8A).
  • D-650W: All PSUs* (+5 VDC @40A, +3.3 VDC @45A, ±12 VDC @12A).
  • E-550W: 28 VDC* (+5 VDC @20A, +3.3 VDC @45A, +12 VDC @16A, -12 VDC @8A).
  • E-650W: All PSUs* (+5 VDC @20A, +3.3 VDC @45A, +12 VDC @21A, -12 VDC @12A).
  • F-575W: 28 VDC* (+5 VDC @40A, +3.3 VDC @22A, +12 VDC @16A, -12 VDC @8A).
  • F-675W: All PSUs* (+5 VDC @40A, +3.3 VDC @22A, +12 VDC @21A, -12 VDC @12A).
  • S-575W: SOSA (+3.3 VDC @22A, +12 VDC @41A).
All PSUs* = All PSUs except 28 VDC input
28 VDC* = 28 VDC input only

/FP Front Panel Layout
  • CMP: Standard CM front panel fitted with MIL-C-38999 connectors.
  • UDP: User defined front panel layout (requires customer drawing).
/TC Chassis Top Cover
  • STC: Standard Top Cover. (Fitted as standard).
  • FTC: Finned Top Cover. Wiring clearance 13mm.
  • HTC: High-profile Top Cover. Wiring clearance 35mm.
  • HETC: Heat Exchanger Top Cover. No Wiring clearance (Fitted as standard).
/BC Chassis Bottom Cover
  • SBC: Standard Bottom Cover. Wiring clearance below backplane 24mm. (Fitted as standard)
  • HBC: High-profile Bottom Cover. Wiring clearance below backplane 49mm.
/CS Chassis Card-cage Slot
  • MCS: Universal Card-cage Slots (Mixed Conduction-cooled & Air-cooled Boards).
  • CCS: Conduction cooled Card-cage Slots (Conduction-cooled Boards Only).
/C Chassis Color
  • B: Black, G: Navy Grey, E: Army Dark Earth, W: White, R: Red, PT: Platinum, YW: Yellow, GN: Green, BLU: Dark Blue, CR: Chromate MIL-C-5541 or O: Other (user defined).
Part Number Example:
CM-ATR-3U/S/VPX/90-264VAC/C-575W/UDP/STC/SBC/MCS/E
  • 5 slot, 3U Avionics Enclosure.
  • Standard Sealed enclosure.
  • 5 slot, 3U VPX backplane.
  • 115VAC @ 400 Hz input power supply.
  • C-575W Power Supply (+5VDC @ 20A, 3.3VDC @ 22A, +12VDC @ 21A, -12VDC @ 12A).
  • User defined front panel layout (requires customer drawing).
  • Heat Exchanger Top Cover. Wiring clearance 13mm.
  • Standard Bottom Cover. Wiring clearance below backplane 25mm.
  • Universal Card-cage Slots (Mixed Conduction-cooled & Air-cooled Boards).
  • Enclosure color is army dark earth.