Mechanical Housing Assembly (MHA)

The Mechanical Housing Assembly (MHA) is a versatile, rugged enclosure for Single Board Computer (SBC) based embedded systems, as used in varied Military, Naval and Industrial applications. The MHA can be configured for use with standard 3U or 6U CompactPCI, VME, VPX or other custom backplanes.

The MHA has dual-redundant hot-swap 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 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 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 6U, four slots Horizontal card orientation Air cooled cards Lockable front access panel
Thermal Management	Forced air cooling via filtered side panel air vents Optional intercooler for chilled water cooling
Power Supply	Dual redundant (hot-plug) power supply option 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 Hour meter General purpose multi-pin circular I/O connector (USB or serial I/O)
Surface Finish	Powder coat painted
Physical - Dimensions (W x H x D) - Mass	450 mm x 310 mm x 565 mm (excluding shockmounts and lifting eyes) 27 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
CCII/MHA/xxx/COM	Commercial
CCII/MHA/xxx/IND	Industrial
CCII/MHA/xxx/RGD	Ruggedised

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

MHA Rev.1 2010-09-08
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