70 Rockwell Automation Publication 7000-UM202H-EN-P - November 2023
Chapter 2 Power Component Definition and Maintenance
1. Isolate and lock out all power to the drive.
2. Note the position of the fiber optic cables for assembly.
3. To remove the SGCT, remove the gate driver power cable and fiber optic
cables. Exceeding the minimum bend radius (50 mm [2 in.]) of the fiber
optic cables may result in damage.
Remove the SPS snubber connector (J1 on the SPS board) and remove the
SPS mounting bracket with the SPS board, if installed.
4. Remove the load on the clamp head assembly as described under
Checking Clamping Pressure
on page 88.
5. Two brackets secure the board to the heatsink. Loosen the captive screws
to free the circuit board. If necessary, adjust the position of the heatsinks
to move the SGCT freely.
6. Slide the circuit board straight out.
7. While grounded, remove the SGCT from its anti-static bag.
8. Clean the heatsink with a soft cloth and rubbing alcohol.
9. Apply a thin layer of electrical joint compound (Alcoa EJC No. 2 or
approved equivalent) to the contact faces of the new SGCTs. 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 heatsink and tighten the captive screws located in the
brackets.
11. Follow procedure Uniform Clamping Pressure
on page 87 to clamp the
heatsinks to a uniform pressure.
If equipped, re-install the SPS board and mounting bracket, and
reconnect the snubber connection to J1 of the SPS board.
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.
IMPORTANT Nylon screws are installed on the 6600V heatpipe model only; these must
be removed when replacing the SGCTs. The purpose of these screws is
for additional support while in transit and they are not required once the
drive is installed on site. They must not be used again when the SGCTs
are replaced.
ATTENTION: Static charges can damage or destroy the SGCT. Properly
ground yourself before removing the replacement SGCT 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 SGCTs come in matched sets in systems with more than one device per
leg. When replacing the device, you must replace all SGCTs in the set even
if only one has failed. Arrange the devices from left to right in sets (that
is, set 1+2, 3+4, 5+6).
IMPORTANT Too much joint compound may result in contamination of other surfaces
leading to system damage.
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