US 4,542,443 A · Termination frame assembly with protection from EMI from field wiring and rack for same

Abstract

A termination frame assembly mounts signal conditioner circuit boards for a data acquisition system individually on a frame with an electromagnetic interference (EMI) barrier extending along the front edge and bending back over the circuit board and then out to form an integral trough through which the field wiring is routed to field terminals on terminal strips in the front face of the barrier. The circuit board is installed from the rear with a guide block, keyed to accept only a selected one of a family of boards, lifting the center of the leading edge to align edge connectors with connectors on the rear of the terminal strips. A plurality of the termination frame assemblies are stacked between, and secured to the front and rear legs of, confronting U-shaped channel members with the field wiring routed vertically along the front legs to the horizontal troughs and with power supply and test signal busses routed along one rear leg and connected by leads to plugs on the termination frame assemblies which engage terminations on the leading edge of the circuit board as it is installed. Additional leads on these plugs are connected to complete a series circuit only when all circuit boards are installed. The stacked termination frame assemblies are mounted in a cabinet with the field terminals and the field wiring in the recessed troughs accessible through a rear door and with the circuit boards which are connected to other equipment in the cabinet by connectors on their trailing edges accessible through the front door.

Claims23

Dependent claims

A termination frame assembly for supporting a generally planar electronic circuit board and for isolating said board from electromagnetic interference from a bundle of field wiring which supplies signals to said board, said assembly comprising:

a substantially rectangular frame member having a front edge and a rear edge;
an electrically conductive barrier member extending inwardly from one face of said rectangular frame member generally in a direction perpendicular thereto and substantially across said one face with at least one portion of said barrier member spaced from the front edge of said frame member;
means for mounting said electronic circuit board on said frame member on one side of said barrier member between said barrier member and the rear edge of the frame member;
and
terminal strip means secured to one of said frame member and said barrier member on a second side of said barrier member and having a plurality of terminals on said second side of the barrier member to which said field wiring is connected, said terminal strip extending through said barrier member and having connector means on the one side of said barrier for making electrical connection between said terminals and circuits on said electronic circuit board, said barrier member extending a sufficient distance from said one face of said frame member and having said at least one portion spaced a sufficient distance from said front edge of the frame member to form a recess in which said bundle of field wiring can be routed from one side of said assembly across said frame member on the second side of said barrier member to the terminal strip means substantially without extending beyond the front edge of the assembly or beyond said barrier member in a direction perpendicular to said one face of the rectangular frame member.

2 more elements

Apparatus for mounting a plurality of signal conditioner circuit boards and for isolating them from electromagnetic interference from the field wiring which provides electrical signals to them, comprising:

a pair of horizontally spaced vertically extending elongated supports;
a plurality of termination frame assemblies each comprising:
a substantially rectangular frame member having a front and a rear;
an electrically conductive barrier member having a first portion extending substantially vertically upward along the front of the rectangular frame member, a second portion extending rearward, substantially horizontally from the top of said first portion and terminating in a rear edge, and a third portion extending substantially vertically upward from the rear edge of said second portion;
means for installing a signal conditioner circuit board on said substantially rectangular frame member between the first portion of said barrier member and the rear of said frame member from the rear of said frame member with a leading edge of the signal conditioner circuit board substantially parallel to the front of the frame member;
terminal strip means mounted to and extending through said first portion of the barrier member and having field terminals on a first side of said first portion of the barrier member facing the front of the frame member to which the field wiring is connected and having connector means on a second side of the first portion of the barrier member facing the rear of the frame member to which circuits on said signal conditioning circuit board are connected;
and
means on each side of each termination frame assembly for securing the same between said vertically extending elongated supports in substantial vertical alignment one on top of another and with the second and third portions of each barrier member and the frame assembly above forming a substantially horizontal trough accessible from the front extending across each termination frame assembly;
and
means for securing bundles of the field wiring along the elongated vertical supports with the field wiring for each signal conditioner circuit board being routed horizontally through said trough formed in the front of the associated termination frame assembly to the terminals on the front thereof.

7 more elements

Dependencies are inferred from the claim text.

Termination frame assembly with protection from EMI from field wiring and rack for same

Life of this patent

Termination frame assembly with protection from EMI from field wiring and rack for same

Life of this patent

Abstract

Claims23