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.
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.
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.
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.
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.
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 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 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.
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.
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.
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.
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.
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.
|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|
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.