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Symmetrical Gate
Commutated Thyristor
Replacement
7000 "A" Frame
The Symmetrical Gate Commutated Thyristor (SGCT or device) with
attached circuit board is located within the PowerCage assembly.
SGCTs must be replaced in matched sets:
• 3300V and 4160V systems use sets of 2
• 6600V systems use sets of 3
The SGCT and associated control board are a single component. There
will never be a time when the device or the circuit board will be changed
individually. There are 4 LEDs on the SGCT, and the following table
describes their functions:
LED 4
Green
LED 3
Green
LED 2
Yellow
LED 1
Red
SGCT captive screws
Inside nut used for loosening
and applying load to assembly
Figure 4.13 – Replacing the SGCT
Component Definition and Maintenance
Solid Green indicates that the Power Supply to the Card is
OK
Solid Green indicates that the Gate-Cathode resistance is
OK
LED ON indicates the gate is ON, and Flashes alternately
with LED 1 while gating
LED ON indicates the gate is OFF, and Flashes alternately
with LED 2 while gating
4-15
Do not adjust outside nut.
7000A-UM151E-EN-P - October 2018
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