Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 400)

6-96 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” Frame
Fiber Optic Interface Boards
The Fiber Optic Interface (FOI) Boards are the interface between the
Drive Control Boards and the Gate Driver circuitry. The drive control
decides which device to fire, and sends an electrical signal to the FOI
boards. The FOI board converts that electrical signal to an optical signal,
which is transmitted via fiber optics to the gate driver cards. Typically,
the Transmit ports are Black and the Receive ports are Blue. The gate
driver accepts that signal and turns the device on and off accordingly.
The diagnostic fiber optic signals work the same way, but the source is the
gate driver boards and the destination is the drive control boards.
Figure 6.73 – Fiber Optic Interface Board
The FOI boards are mounted directly on the DCBs using two parallel 14-
pin connectors for the electrical connection, and plastic clips to provide
the mechanical strength. Each FOI board can handle the Firing and
Diagnostic duplex fiber optic connector for 6 devices, whether they are
SCRs or SGCTs. Physically, on the Drive Control Boards, there is
provision for 18 devices for the inverter and the rectifier. This is enough
capacity to handle the highest rated drive that we currently produce. The
top FOI board on the DCB is for the „A‟ devices, the middle FOI board on
the DCB is for the „B‟ devices, and the bottom FOI board on the DCB is
for the „C‟ devices.