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Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control User Manual

Page 330

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6-26

Component Definition and Maintenance

7000A-UM150F-EN-P –June 2013

7000 “A” Frame


The method for replacing the Silicon Controlled Rectifier (SCR) is almost
identical to that of the SGCT. The one exception is that the SCR and
circuit board can be replaced independently of one another.


1. Ensure there is no power to the equipment.

A T T E N T I O N

A T T E N T I O N

To prevent electrical shock, ensure the main
power has been disconnected before working on
the drive. Verify that all circuits are voltage free
using a hot stick or appropriate voltage-measuring
device. Failure to do so may result in injury or
death.

2. Note the position of the Fiber Optic Cables for reassembly.

3. To Remove the SCR and SCR SPGD Board, it is necessary to remove

the Gate Driver Power Supply connector (from snubber circuit), the
fiber optic cable, and the SCR gate-cathode connection. Exceeding
the minimum bend radius (50 mm/2 in.) of the fiber optic cables may
result in damage.

A T T E N T I O N

A T T E N T I O N

The fiber optic cables can be damaged if struck
or bent sharply. The minimum bend radius is 50
mm (2 inches). The connector has a locking
feature that requires pinching the tab and gently
pulling straight out. The component on the
printed circuit board should be held to prevent
damage.


4. Remove the load on the clamp head assembly as described on page

6-19.


5. Loosen the 2 captive screws with a long Phillips screwdriver until the

circuit board is free. It may be necessary to adjust the position of the
heatsinks to allow free movement of the SCR.


6. Slide the SCR and SCR SPGD Board straight out.


7. While grounded, unplug the Gate-Cathode phoenix connector from

the SCR SPGD Board.

Silicon Controlled Rectifier

and SCR Self-Powered Gate

Driver Board Replacement