3U - FAC - Flowthrough Air Cooled

Rugged OPEN COTS 3U ½ ATR - 5 slot. Certified per MIL-461F & MIL-810G for immediate deployment. Applications up to 300 watts.
Configure Now

3U - FAC - Flowthrough Air Cooled

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

3U ATR FAC Description

Non-sealed, 1" pitch, high performance 3U chassis in which external air is directly forced over electronic payload modules using a rear mounted exhaust fan. This efficient thermal management technique is suitable for full PSU wattage applications.

CM-ATR-3U/FAC

Heat generated within the enclosure is dissipated via forced air convection. An exhaust fan (or air plenum) draws ambient air through the chassis carrying unwanted heat from payload modules. Heat is also conducted through the chassis metalwork to the environment.

CM-ATR-3U/FAC

The 3U FAC chassis is available in a 5 slot version only (½ ATR), supporting VME, cPCI & VPX backplanes. A total PSU power of up to 575 watts may be installed. Custom modifications can be designed upon customer request.

CM-ATR-3U/FAC 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 FAC Performance

Dissipation:★★★★

Price:★★★☆

Slots / Pitch:5   1"

Open (Ambient Air):

≤ 300W

The 3U FAC chassis is suitable for high wattage non-sealed applications that demand superior cooling capability.

FAC - Chassis Global Thermal Resistance (CGTR) coefficient:
ΔT/W = 0.06°C (½ ATR).

FAC - Chassis Payload Thermal Resistance (CPTR) coefficient:
ΔT/W = 0.096°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, cPCI 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 46.0/.1/.10/.3/.4/.7.
  • Compact PCI backplanes according to IEC 1076 / PCI 1101.10/IEC 48D/118/CD standards.
  • 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.
Read More

3U FAC Power Supplies

3U FAC 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 575 Watts. Available in 3 different versions (A-B-C) to suit the demand per DC Line of standard COTS open busses.

CM-PS-3U/FAC

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-461E, 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 FAC 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 FAC 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 FAC Power Supply Unit

The PSU in FAC models is attached to a heat exhanger 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.


Read More

3U ATR FAC Features

3U FAC Rear Fan Assembly
Rear Fan Options
3U FAC chassis fit a single Rugged (-10°C to +70°C) exhaust fan as standard. Military PX2 fans are optional (-54°C to +125°C).
3U FAC 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 FAC 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 FAC Panel Covers
Top/Bottom Covers
Optional Extended or Heat Exchanger covers can be selected for additional wiring clearance & are removable for easy maintenance.
3U FAC Chassis Metalwork
Chassis Metalwork
Precision machined aeronautical aluminum with MIL-DTL-5541F chromate coating. All panels & joints incorporate EMI gaskets.
3U FAC Mounting Tray
Mounting Tray
Low profile with quick release system offers easy insertion/removal capability, weight optimized with minimized dimensions.
3U FAC 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 FAC 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 FAC Card-cage Slots
Card-cage Slots
Selective mechanics for either mixed (MCS: Conduction-cooled & Air-cooled boards) or (CCS: Conduction-cooled boards only).

Capabilities

  • VPX, VME64, cPCI & cPCI-S ready (1" Pitch)
  • Accepts Conduction & Air-cooled 3U Modules
  • Flexible Top & Bottom I/O wiring
  • In-line EMI/EMC MIL-STD-461F Filter
  • Up to 300W* Total Payload Power (30ºC Delta-T)
  • Integrated Temperature Supervisory Unit (TSU)
  • 20°C less than conventional 3U ATRs
  • Dramatically increases payload MTBF by 4x*
  • 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)
  • Customizable to specific requirements
  • Low Profile Mounting Tray with quick release
  • Manufactured with US MIL components
* Subject to operating conditions

3U ATR FAC Specifications

CM-ATR-3U/FAC
WIDTH 153 mm
HEIGHT 225 mm
DEPTH 248 mm
WEIGHT 3.9 Kg
CGTR COEFF ΔT/W = 0.06°C
CPTR COEFF ΔT/W = 0.096°C
MAX PSU POWER 575 Watts (28 VDC 475 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
EXT. REAR FAN 1 x Rugged Fan or 1 x Rotron PX2 Fan
STDF-DC 27 CFM (Rugged)
STDF-AC 27 CFM (Rugged)
F115-400 65 CFM (Rotron PX2)
F200-400 120 CFM (Rotron PX2)
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/FAC

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.

3U ATR MIL Certificates

3U ATR Ordering Information

Generic Part Number:
CM-ATR-3U /CT /B /I /W /FP /TC /BC /CS /F /C
/CT Enclosure Cooling Technique
  • CM-ATR-3U/FAC: Flowthrough Air Cooled (open).
/B Backplane Type
  • VME64x: Military VME64x Backplane (5 Slot 3U 1" Pitch).
  • cPCI: Military Compact PCI 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).
  • 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).
  • 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).
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. Wiring clearance 13mm. (Fitted as standard).
  • FTC: Finned Top Cover. Wiring clearance 13mm.
  • HTC: High-profile Top Cover. Wiring clearance 35mm.
  • HETC: Heat Exchanger Top Cover. Wiring clearance 13mm.
/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).
/F Rear-mounted Fan Assembly
  • STDF-DC: 1x 27 CFM DC Rugged Fan.
  • STDF-AC: 1x 27 CFM 115 VAC @ 400Hz Ruggedd Fan.
  • F115-400: 1x CFM Rotron PX2 Military Fans fitted for 115 VAC @ 400Hz.
  • F200-400: 1x 120 CFM Rotron PX2 Military Fan fitted for 200 VAC 3-phase @ 400Hz).
/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/FAC/VPX/90-264VAC/C-575W/UDP/STC/SBC/MCS/F115-400/GN
  • 1/2 ATR, 5 slot, 3U Avionics Enclosure.
  • Flowthrough Air Cooled Enclosure (Open, Non-Sealed).
  • 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.
  • Conduction Card-cage Slots (Conduction-cooled Boards Only).
  • 2x 47 CFM 115 VAC @ 400 Hz Rugged Fans.
  • Enclosure color is yellow.
  • 1x 65 CFM 115 VAC @ 400 Hz Military Fan.
  • Enclosure color is green.