Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control User Manual
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Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
Chapter 5
Component Definition and Maintenance
7.
While grounded, remove the SGCT from the anti-static bag it is supplied
in.
8.
Assemble the brace angle from the old SGCT to the new SGCT.
9.
Apply a thin layer of Electrical Joint Compound (Alcoa EJC No. 2 or
approved equivalent) to the contact faces of the new SGCTs to be
installed. The recommended procedure is to apply the compound to the
pole faces using a small brush, and then gently wipe the pole face with an
industrial wipe so that a thin film remains. Examine the pole face before
proceeding to ensure that no brush bristles remain.
10.
Slide the SGCT into place until the mounting brackets contact the surface
of the chill block. Do not force SGCT when inserting into place. Make
sure it slides in with little resistance
. Use a Phillips screwdriver to tighten
the captive screws to the cathode side of the chill block.
11.
Readjust the clamping load as described in
.
12.
Connect the control power cable and fiber optic cables (ensure the bend
radius is not exceeded).
Silicon Controlled Rectifier
and SCR Self-Powered Gate
Driver Board Replacement
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.
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.
IMPORTANT
Too much joint compound may result in contamination of other
surfaces leading to system damage.
ATTENTION: 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.