Functional Description 1-21
7000-TD002A-EN-P – September 2007
Diagnostic
feedback high
Diagnostic
feedback low
Voltage across a thyristor when medium voltage is applied
Diagnostic feedback
for a healthy SCR
Diagnostic feedback
for a shorted SCR
No Light
+5V
0
+5V
0
Figure 1.9 – Voltage across a thyristor when MV is applied
y
ical S
ating
att
Healthy Diagnostic Feedback
Gate Cathode shorted or PS problem
+5V
0
+5V
+5V
+5V
+5V
0
0
0
0
No gating received
No diagnostic feedback
NO LIGHT
(Device Off)
LIGHT
(Device On)
LIGHT NO LIGHT
NO LIGHT LIGHT
LIGHT
NO LIGHT
Figure 1.10 – SGCT diagnostics
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