Rockwell Automation 7000L PowerFlex 7000 Medium Voltage AC Drive C Frame - Marine - Manual (Page 288)

4-112 Component Definition and Maintenance
7000L-UM302B-EN-P – June 2013 7000 ―C‖ Frame - Marine
Optical Interface Boards (OIB)
The Optical Interface Boards are the interface between the DPM and
the Gate Driver circuitry. The drive control decides which device to
fire, and sends an electrical signal to the OIB boards. The OIB 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 Grey 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.
Each OIB contains one extra fiber optic receiver (RX7), which is
used for temperature measurement.
Figure 4.78 – Optical Interface Board
The OIB boards are mounted directly on the Optical Interface Base
Board (OIBB) using two parallel 14-pin connectors for the electrical
connection, and plastic clips to provide the mechanical strength.
There is one OIBB for the inverter, and one OIBB for the rectifier
device. The OIBBs are interfaced to the DPM using two ribbon
cables to connect to J11 and J12.
Each OIB board can handle the Firing and Diagnostic duplex fiber
optic connector for 6 devices, whether they are SCRs or SGCTs.
Physically, on the OIBBs, there is provision for 18 devices for the
inverter and the rectifier. The top OIB board on the OIBB is for the
‗A‘ devices, the middle OIB board on the OIBB is for the ‗B‘
devices, and the bottom OIB board on the OIBB is for the ‗C‘
devices. Test points for the OIB gating diagnostic and temperature
feedback signals are on the OIBB.