KM6-II HD (Heavy Duty) Subrack Accessories

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Side Plates

KM6-HD side plates are manufactured from 3mm thick aluminium for additional strength and rigidity. Tiebar fixing positions are punched on the Eurocard pitch of 60mm along the length of the side plates, allowing various subrack configurations to be assembled. Countersunk holes are used to ensure accurate alignment of tiebar extrusions and a conductive finish is applied throughout.
* 160+80 depth side plates are designed for rear plug-up applications and meet the requirements of IEEE 1101.10/11.These provide for a 160mm front card area and 80mm rear card area.

19" Rack Angles

Rack angles are available with handle holes to accept the heavy duty bar handles shown on page 1.90 – these should be ordered seperately. A special 6U rack angle is also available for situations where a front horizontally divided subrack is required; they are machined / punched to provide 2 x tibar positions in the 3U position.

Closing Angles

Rack angles are available with handle holes to accept the heavy duty bar handles shown on page 1.90 – these should be ordered seperately. A special 6U rack angle is also available for situations where a front horizontally divided subrack is required; they are machined / punched to provide 2 x tibar positions in the 3U position.

Vertical EMC Gasket

Rack angles are available with handle holes to accept the heavy duty bar handles shown on page 1.90 – these should be ordered seperately. A special 6U rack angle is also available for situations where a front horizontally divided subrack is required; they are machined / punched to provide 2 x tibar positions in the 3U position.

Subrack Bar Handle

Heavy duty bar handles aid the safe handling of a subrack and are secured to the 19” rack angles with M5 screw fixings. Supplied as a pair. (Note: 19” rack angle with handle fixing holes must be used)

Front Tiebars

KM6-HD front tiebars feature a heavy, extruded profile and twin screw fixing method to ensure strength and rigidity in demanding applications. Provision is made for card guides to be placed at 1HP (5.08mm) increments and positively retained with 2 screws, increasing their resistance to shock and vibration. For EMC applications, a slot is included in the extrusion for covers to be located without the need for additional seals.
IEEE 1101.10 versions have an extended front lip with rectangular cut outs to aid
compliant Injector / extractor handle functionality, often used in CompactPCI, PXI, VME64 Extensions, VPX etc. applications.
IEC 60297-3 versions are similar to the above but without the extended lip.
These are normally used for panels which do not carry the injector / extractor to
IEEE 1101.10

Rear Tiebars (Backplane Mounting)

KM6-HD rear tiebars include similar features to the front tiebars detailed above.
They require a 1mm spacer to be fitted in order to maintain the correct geometry of the reference face of a backplane. This would normally be an insulator but a conductive version is also available. A second tapped strip position in the top of the extrusion is used to secure an EMC cover down. Rear backplane tie bars can be converted to DIN 41612 connector mounting tiebars by means of a connector mounting adaptor – see page 1.50.

Centre Rear Tiebars

When fitted with tapped strips these tiebars are used as centre rear backplane supports / mountings. In order to maintain correct connector geometry it is necessary to fit a spacer, either conductive or insulating between extrusion and backplane. Rear backplane tie bars can be converted to DIN 41612 connector mounting tiebars by means of a connector mounting adaptor

DIN41612 Connector Adapter Rails

Supplied in pairs in various lengths with M2.5mm pre-tapped holes on a 1HP (5.08mm) pitch, these extrusions are used to convert backplane mounting tiebars to suit DIN 41612 connectors. A 6HP version is of particular use for mounting one connector to mate with a power supply for example.

Tapped Strips and Backplane Spacers

Tapped Strips are supplied pre-tapped with an M2.5mm thread on a 1HP (5.08mm) pitch, tapped strips are used extensively in extruded tie bars to provide accurate, adjustment free assembly fixing locations for standard front panels, backplanes, EMC covers and other accessories. They can easily be cut down for non-standard lengths.

Backplane spacers must be used with all KM6-HD mid/rear tiebars to maintain correct connector geometry between extrusion and backplane. They are available in insulating and conducting versions depending on the application

Card Guides and Fixing Screws

KM6-HD card guides serve to support, guide, earth and code PCBs in a subrack. They are easily snapped into place between the front and mid/rear tiebar extrusions but can also be screwed front and back to improve resistance to shock and vibration. Screws should be ordered separately as should grounding clips, ESD springs and coding keys. The range of guides available can cater for board depths of up to 400mm in both 1.6mm & 2.4mm thicknesses. The underside of the guide has been designed to be aerodynamic so as to aid the flow of air and not impede it. A green coloured version with a 0.5HP offset guide position is available for plug-in CompactPCI power supplies (conforming
to PICMG 2.11) whilst a red coloured version is available to identify CPU slots in
CompactPCI systems.

Fixing Screws are supplied in packs of 100, these 8mm (No.2 x 5/16) self-tapping screws are used to positively retain card guides to the tiebar extrusions. Two screrws are required per guide.

Clips and Coding Keys

PCB Grounding Clips
Inserting this grounding clip into the front of a KM6-HD card guide allows PCBs to be grounded before engagement of connectors occurs, thus protecting sensitive electronic components from ESD (electrostatic discharge). Contacts on the clip provide electrical continuity between a suitable equipped eurocards and the front tiebar extrusion, via a spring under the clip. A unique double-action spring design means both 1.6mm and 2.4mm thick PCBs are catered for.

Front PAnel ESD Clip
For grounding the pre-location / ESD pin of an injector / extractor handle, a separate clip is available. The spring clip is inserted into a cavity behind the round hole in the coding section of the guide and ensures front panels are grounded before engagement of connectors occurs, thus protecting sensitive electronic components from ESD (electrostatic discharge).

Coding Keys
Should the application require it, front panels can be coded to ensure PCBs can only be fitted in certain slot positions. Coding keys are inserted into the square holes in the front section of the guide and can be rotated in 90 degree increments to give many unique keying combinations. They should also be fitted to the corresponding (opposite) locations in the injector / extractor handle casting.

Filler Strip and Seals

EMC Filler Strip
Should the application require it, front panels can be coded to ensure PCBs can only be fitted in certain slot positions. Coding keys are inserted into the square holes in the front section of the guide and can be rotated in 90 degree increments to give many unique keying combinations. They should also be fitted to the corresponding (opposite) locations in the injector / extractor handle casting.

Fabric Seal
Used to improve all round EMC performance of a subrack, this Nickel plated Copper over closed cell foam material is self-adhesive and easily cut to length making it simple to use. It should be fitted along lengths of adjacent panels / plates / extrusions such us between covers and tiebars or covers and sideplates. It is supplied in 430mm lengths.

Horizontal Front Panel Seal
Supplied in 430mm lengths, this self-adhesive seal fits to the inside face of the front tiebar extrusions to maintain electrical contact between the front panels and the extrusion front face. It is of particular relevance on wider panels where it serves to close off long slots which might be disadvantageous to EMC performance.

EMC Covers and Closing Panels

Top and Bottom EMC Covers
Supplied in a pair, the ventilated top and bottom covers come in two versions;
(1) front PCB area covers and (2) rear area covers. The specific vent pattern of 5mm square holes on a 6.35mm pitch provides the maximum open-area for cooling whilst maintaining a high level of electro-magnetic compatibility (EMC).Covers are designed to maintain intimate contact with the end plates by means of screws and internal flanges. At the interface with the front extrusions, a slot in the tiebar captures each cover, providing an EMC tight, interference fit. A tapped strip position in the centre-rear extrusion allows each covers to be screwed down, meaning they can thus be fitted after the subrack has been assembled and easily removed for access.

Front and Rear EMC Closing Panels
These full width (84HP) closing panels can be used at the front or rear of the subrack. Plain types are secured using 12 x captive screws and are therefore suited to applications where access is seldom required. Hinged types are useful when frequent access to the subrack is required. Both types use beryllium copper fingers along their edges to maintain contact with side plates & tie bar extrusions

Chassis System and Fixing Screws

Chassis System
The chassis system offers a method of mounting simple plates into subracks. They can be used for carrying additional components such as power supplies, for supporting bespoke circuit boards or for securing cable looms. The components of the chassis system are designed for maximum versatility. The extrusion profile consists of two main sections; it has an M4 section which will accept M4 hex nuts and screws directly, and a section which will accept a standard tapped strip or M2.5 hex nuts and screws directly. The ends of the extrusion are drilled and tapped M4 for fixing into the subrack side plates.

Fixing Screws
When KM6-HD components are purchased individually, relevant fixing screws should be ordered