Rockwell Automation 7703E Medium Voltage SMC OEM Components - 10-15 kV - Manual (Page 23)

Rockwell Automation Publication 7703E-IN001E-EN-P - July 2014 23
PowerBrick™ Installation Chapter 3
Current Loop Gate Drive
Power Assembly (CLGD) The CLGD power assembly is provided as a loose component with the
PowerBricks. It should be mounted adjacent to the PowerBrick in a manner that
allows the secondary cable assembly to be correctly installed (see below).
The CLGD power assembly consists of three parts:
1. Power supply (transformer with secondary terminal blocks and sensing
CT)
2. Current Transformer (CT) assembly (plastic tubing with two current
transformers per PowerBrick)
3. Loop Cable (white, silicone insulated, 50 kV DC, #6 AWG)
The CT assembly is mounted with hardware to the left side of the PowerBrick
stack, and can be pivoted to the left by loosening the mounting hardware to allow
removal of individual PowerBricks without removing the CT assembly. The
current transformer secondary leads plug into the gate driver board directly
behind each CT, and must all be unplugged to pivot the assembly.
Figure 9 - PowerBrick Current Loop Gate Drive Cable Assembly and Power Supply
ATTENTION: Check that all CT leads are plugged into each gate driver board
before putting the SMC into service. Failure to do so may result in erratic
operation and/or equipment damage during option stop maneuvers.