The 3U Air-Cooled Mechanical Housing Assembly (MHA) is a versatile, rugged enclosure for embedded systems, as used in varied Naval, Military and Industrial applications and has extensive I/O capability and options.

The MHA can be configured for use with a wide range of standard or custom backplanes.

The MHA has dual-redundant hot-swappable power supplies, connected in a load-sharing topology, capable of operating from a wide AC input range and supplying standard DC output rails. On-board power line filtering is implemented to limit susceptibility to EMI and RFI.

The modular rear-I/O connector plate can easily be customised to suite any end application. Resilience to shock and vibration is ensured by the MHA’s external shock isolation mounts, which operate in conjunction with the inner cage’s own shock isolation mounts.

The MHA supports many further optional features, including a 305 mm (12") TFT LCD Touchscreen, located on the front access panel.

Features

Support for various 3U and 6U backplanes (CompactPCI, VME, VPX, custom, etc.)
Four CompactPCI or VME card slots in the standard configuration (expandable)
Rugged, stainless steel plate construction
Dual-redundant power supplies
External and internal mechanical shock isolation
Forced-air or chilled water cooling
Front-panel hour meter, power and battleshort switches, USB connector and CO₂ injection point
Optional 305 mm (12") TFT LCD touchscreen

Mechanical Housing Assembly

Mechanical Housing Assembly

Specifications
Mechanical Construction	3CR12 stainless steel plate (2,5 mm) construction CNC laser cut parts All stainless steel nuts, bolts and screws Removable lifting eyes Freestanding (with or without shockmounts) and 19" rackmount options
Card Area	Shock isolated inner card cage 3U : vertical card orientation, up to eight slots 6U : horizontal card orientation, up to four slots Air-cooled cards Lockable front access panel
Thermal Management	Forced air cooling via filtered side panel air vents Optional intercooler for chilled water cooling
Backplane Type	Various standard 3U or 6U options (CompactPCI, VME, VPX, etc.) Custom 3U or 6U backplanes
Power Supply	Dual-redundant power supplies (application specific rating) EMI/RFI power line filtering
I/O Interface	Fully customisable rear I/O area Rear I/O plate angled for cable strain relief
Switches and Indicators	Standard front panel switches and indicators : Power and battleshort switches Running hour meter General purpose multi-pin circular I/O connector (USB or serial I/O)
Surface Finish	Powder coat painted
Physical - 6U Dimensions (W x H x D) - 6U Dimensions (W x H x D) - 3U Mass - 3U Mass	450 mm x 310 mm x 565 mm (excluding shockmounts and lifting eyes) 450 mm x 270 mm x 565 mm (excluding shockmounts and lifting eyes) 27 kg ± 0,5 kg (excluding options) 25 kg ± 0,5 kg (excluding options)
IP Rating	IP-54 (IEC-60529)
Acoustic Noise	< 55 dBA at 1 m
MTTR	< 1 hour onboard

Environmental Specifications
	Commercial Grade	Industrial Grade	Ruggedised Grade
Temperature - Operating - Storage	0 C to +55 C -40 C to +85 C	-15 C to +75 C -50 C to +85 C	-40 C to +85 C -60 C to +125 C
Humidity	0% to 90%	0% to 95%
Shock	N/A	25 g for 5 ms, ½ sine (operational) 30 g for 10 ms, ½ sine (non-operational)
Vibration	N/A	i.a.w. DEF-STAN 07-55 (Part 2), Section 1/1, Annex A, Figure 4
EMC	i.a.w. MIL-STD-461C (Table 5 for Class A4 equipment installed on surface ships)

Part Designations
Part Number	Grade	Backplane Size
CCII/MHA/AC/6U/xxx/COM	Commercial	6U
CCII/MHA/AC/6U/xxx/IND	Industrial	6U
CCII/MHA/AC/6U/xxx/RGD	Ruggedised	6U
CCII/MHA/AC/3U/xxx/COM	Commercial	3U
CCII/MHA/AC/3U/xxx/IND	Industrial	3U
CCII/MHA/AC/3U/xxx/RGD	Ruggedised	3U

Note : The three digit code (xxx) in the part number denotes customer specific backplane options.

MHA Rev2.1 2015-07-31
CCII Systems (Pty) Ltd • P.O. Box 171 • Rondebosch 7701 • South Africa
Telephone : (+27 21) 683 5490 • Facsimile : (+27 21) 683 5435 • WWW : www.ccii.co.za