Replacing the sgct – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual
Page 69
Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
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Component Definition and Maintenance
Chapter 3
Replacing the SGCT
The SGCT (“device”) with attached circuit board is located within the
PowerCage assembly. You must replace SGCTs in matched sets (2 sets for 4160V,
3 sets for 6600V).
The SGCT and associated control board are a single component. Never change
the device or the circuit board individually. There are four LEDs on the SGCT,
and the following table describes their functions.
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
.
5.
Two brackets secure the board to the heat sink. Loosen the captive screws
to free the circuit board. If necessary, adjust the position of the heat sinks
to move the SGCT freely.
LED 4
Green
Solid Green indicates that the Power Supply to the Card is OK
LED 3
Green
Solid Green indicates that the Gate-Cathode resistance is OK
LED 2
Yellow
LED ON indicates the gate is ON, and Flashes alternately with LED 1 while gating
LED 1
Red
LED ON indicates the gate is OFF, and Flashes alternately with LED 2 while gating
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 heat pipe 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.