KM6-II Subrack Accessories

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Tapped Strips

Tapped M2,5 holes on a pitch of 1HP, these strips are used for fixing front panels, backplanes, or as an option for chassis plates. As an alternative to tapped strips, a slide nut suitable for use in front tie bars only can be used where a small number of locations are required. Also available is an M3 tapped strip for such applications as ATCA backplane mounting.

DIN 41612 Connector Mounting Frame

 Converts backplane extrusions to DIN 41612 mounting
 Separate assembly and wiring possible
 3U height
 Various widths
 Conductive finish

This frame is supplied as a kit comprising 2 aluminium extrusions with M2,5 holes on a 1HP pitch, two steel end plates and fixings.

DIN 41612 Connector Mounting Extrusions

As an alternative to the mounting frame the horizontal extrusions are available in separate kits. A 6HP version is of particular use for mounting one connector to mate with a power supply plug-in units. There is also a version at 84HP width. In both cases, the kit comprises two extrusions and fixings.

Backplane Spacer Strips

Two types of spacer strips are available, insulating and conductive. The insulating type is available in one and two level versions, each having half shears to aid assembly. The two-level version is used on centre rear tie bars. The 84HP strips can be easily cut down for smaller widths. The conductive strip is 42HP wide and supplied singly.
Note: If conductive spacer strips are used in 84HP subracks please order 2 x 42HP
spacer strips per tie bar

KM6-II Guides

A number of different guides are available to suit both standard eurocards and also 111.76/245.1mm high (3U/6U) plug-in units, in a variety of depths and card thicknesses.

SINGLE PART GUIDES
Type 1 PCB For Eurocards of 1,6mm thickness, either 100mm, 160mm or 220mm long. Compatible with grounding clip & bolt-down screw.
Type 2 PCB For Eurocards of 2,4mm thickness, either 160mm or 220mm long. Not compatible with grounding clip or bolt-down screw.
Type 3 PIU For standard plug-in units (111.76 or 245.1mm height), 1.6mm thickness, 160mm or 220mm long. Not compatible with grounding clip, compatible with bolt down screw.
Type 4 PCB For Eurocards of 1,6mm thickness, 220mm long, this guide will fit over intermediate extrusions, permitting mixing of pcb depths. Compatible with grounding clip & bolt-down screw.

THREE PART GUIDES
For Eurocard PCB or PIU depths of 280mm, 340mm & 400mm, the below three part guides should be used. Comprising a centre aluminium section (with plastic insert) and two guide feet, they can easily be cut to suit other custom lengths. (Note that the centre extrusion should be cut 76mm short of the desired eurocard length, e.g. a 400mm guide would have a 324mm long extrusion).

PCB Grounding Clip

This grounding clip can be inserted into the front or rear of 1,6mm pcb guides in
KM6 subracks.
Features
 Electrostatic Protection
 Occupies ‘unused’ area of Eurocard
 No screws required
Contacts on the clip provide electrical continuity between a suitably equipped Eurocard and, via a spring under the clip to standard front extrusions. Pcb’s can, therefore, be grounded before the engagement of connectors. The clip, which is supplied in packs of 10, fits into a ‘pocket’ in the guide and requires no screw fixings to maintain contact.
The modification required to the pcb takes the form of a conductive strip along the edge of the board, either on the left or right side (see illustration). The clip has been tested to IEC 950: 1986 section 2.5.11. In testing, the clip reached a steady temperature of 76 degrees C at 15A, with a resistance path of 7mΩ. A typical electrostatic discharge would be 12A for a period of 1 microsecond. It should be noted that the clip is designed to provide a ground path for electrostatic charges, not for a power short circuit or as a ground rail.

Positive Guide Retention – Tapped Strips

All KM6-II guides, with the exception of the 2,4mm slot version, can be bolted down to a tapped strip in the front extrusion to give shock and vibration resistance. Tapped strips (supplied singly) should be selected by subrack width. The screw used is M2,5 x 5mm cheesehead, supplied in a packet of 100.

PCB Retainers

Card retainers are available in two types, normal and security. The normal retainer is positioned directly in front of the guide moulding and is operated by finger pressure as illustrated to release the PCB. The security retainer is designed for extra security in vibrative environments and is operated by a unique screw arrangement.
Once clipped in position in front of a PCB guide, complete security is achieved by 3 turns anti-clockwise of the retaining screw with a screw driver.

PCB Injector/Ejector

PCB’s fitted with multiple DIN connectors can require very high insertion and withdrawal forces. These injector/ejectors comprise levers which fit to the PCB and saddles which are retained in front of the guide.It is recommended that guides are screwed down where insertion forces are excessive.

PCB Guide Nose

 Assists location of PCBs
 Extends existing KM6 PCB guide
The guide nose fits to standard 1,6 PCB guides, extending their length to within 5mm of the inside face of a front panel. The increased length is especially useful for locating circuit boards in subracks which are above or below eye level. It also provides a purchase point for the operation of certain types of card ejector.

KM6-II 6U Divider Kits

KM6-II, front divider kits can be fitted after assembly of the subracks.
For use with 6U subracks, these divider kits provide a useful way to mix 3U and 6U board heights within a unit. The divider section is available in different widths, from 21HP to 84HP, and divides the subrack from either the left hand or right hand side.
The design of the kit is such that there is no loss of front panel space. It should be noted, however, that the divider plate restricts the use of ‘C’ type connectors to plug-in units of 4 HP width, or greater, at the position immediately to the left of the plate.

KM6-II 9U Front Divider Plate

This plate will divide a 9U subrack into 3U and 6U sections.
It should be ordered in conjunction with 6U front divider kits.
(The 6U plate is discarded.)

KM6-II Left and Right Hand Divider Kit

Rear Divider Kits

Rear dividers shorten the depth of the subrack by 60mm locally at the rear, and are employed when it is necessary to use mixed depth PCBs or modules within a 3U or 6U subrack. Example: where 160mm PCBs are required in a frame where the rear extrusions are set for 220mm deep PCBs.Rear dividers can be supplied as listed below (as a 6U kit), or can be configured by using 3U and 6U dividers together with rear tie bars and Retapped strips which are available separately.

Rear Divider Plates

Rear dividers shorten the depth of the subrack by 60mm locally at the rear, and are employed when it is necessary to use mixed depth PCBs or modules within a 3U or 6U subrack. Example: where 160mm PCBs are required in a frame where the rear extrusions are set for 220mm deep PCBs.Rear dividers can be supplied as listed below (as a 6U kit), or can be configured by using 3U and 6U dividers together with rear tie bars and tapped strips which are available separately.