Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 277)

Component Definition and Maintenance 5-35
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
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 inches).
When installing the fiber optic cable, the colour of the connector at the
end of the cable must match the colour of the connector socket on the
circuit board.
Lengths of fiber optic cables used in the product include:
Duplex Simplex
5.0 meter 5.0 meter
5.5 meter 6.0 meter
6.0 meter 10.0 meter
6.5 meter
7.0 meter
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.