For det – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual
Page 86
86
Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3
Component Definition and Maintenance
Replacing SCR and SCR Self-Powered Gate Driver Boards (SPGDB)
Replacing the SCR is similar to replacing the SGCT, except that you can replace
the SCR and circuit board independently of one another.
1.
Isolate and lock out all power to the drive.
2.
Note the position of the fiber optic cables for reassembly.
3.
To remove the SCR and SCR SPGDB, first 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.
4.
Remove the load on the clamp head assembly as described under
.
5.
Loosen the 2 captive screws with a long Phillips screwdriver until the
circuit board is free. If necessary, adjust the position of the heat sinks to
allow free movement of the SCR.
6.
Slide the SCR and SCR SPGDB straight out.
7.
While grounded, unplug the Gate-Cathode connector from the SCR
SPGD board.
To replace the SCR, follow steps 8-11 and 15-18.
To replace the SCR SPGDB, follow steps 12-18.
ATTENTION: To prevent electrical shock, disconnect the main power 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.
ATTENTION: You may damage the fiber optic cables if you strike or bend them
sharply. The minimum bend radius is 50 mm (2 in.). The connector has a locking
feature that requires pinching the tab and gently pulling straight out. Hold the
component on the printed circuit board to prevent damage.
ATTENTION: Static charges can destroy or damage the SCR and SCR SPGD
board. Properly ground yourself before removing the replacement SCR and SCR
SPGD board from the protective anti-static bag. Using damaged circuit boards
may also damage related components. Use a grounding wrist strap for handling
sensitive circuit boards.
IMPORTANT
Never adjust the orientation of the SCR using the Gate and Cathode Leads.
These connections are sensitive; adjust the device orientation by turning the
device itself.