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Optical Interface Boards
7000 "A" Frame
The Optical Interface (OIB) 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 4.41 – 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. This is enough capacity to handle the highest rated drive that we
currently produce. 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.
Component Definition and Maintenance
7000A-UM151E-EN-P - October 2018
4-53
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