Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 154)

154 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Optical Interface Boards 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 122 - 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 six devices. 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.