Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 93)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 93
Component Definition and Maintenance Chapter 3
Fiber Optic Cabling The equipment is provided with fiber optic cabling as a means of interfacing the
low voltage control to the medium voltage circuits. The user of the equipment
should never need to change the routing of the fiber optic cables.
Each end of a fiber optic cable is provided with a connector that plugs and latches
into its respective location on a circuit board. To disconnect a fiber optic cable,
depress the ridged plastic tab at the end connector and pull. To install a fiber
optic cable insert the fiber optic port of the circuit board so that the plastic tab
latches into place.
If the user finds it necessary to replace fiber optic cables, great care must be taken
to prevent the cables from becoming strained or crimped as a resulting loss in
light transmission will result in loss in performance.
The minimum bend radius permitted for the fiber optic cables is 50 mm (2.0 in.).
When installing the fiber optic cable, the color of the connector at the end of the
cable must match the color of the connector socket on the circuit board.
Lengths of fiber optic cables used in the product include:
There is one duplex fiber optic for each thyristor, which manages gating and
diagnostic functions. The healthy status of the thyristor is determined by the
circuitry on the respective driver boards. This information is then sent to the
main processor via a fail-safe light signal in the fiber optic. The firing command
for the thyristor is initiated by the main processor and transmitted to the
appropriate gate driver board via the gating fiber optic.
The color codes of the connectors are:
• BLACK or GREY – is the transmitting end of the fiber optic.
• BLUE – is the receiving end of the fiber optic.
Duplex Simplex
5.0 m 5.0 m
5.5 m 6.0 m
6.0 m 10.0 m
6.5 m
7.0 m