Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control User Manual
Page 329
Functional Description 5-21
7000 “C” Frame
7000L-UM300I-EN-P – June 2013
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
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
Figure 5.9 – Voltage across a thyristor when MV is applied
Typical SGCT Gating pattern
Healthy Diagnostic Feedback
Gate Cathode shorted or PS problem
1
0
0
0
0
0
LIGHT
NO LIGHT
NO LIGHT
LIGHT
LIGHT
NO LIGHT
LIGHT
NO LIGHT
No gating received
No diagnostic feedback
1
1
1
1
Typical SGCT Gating pattern
Healthy Diagnostic Feedback
Gate Cathode shorted or PS problem
1
0
0
0
0
0
LIGHT
NO LIGHT
NO LIGHT
LIGHT
LIGHT
NO LIGHT
LIGHT
NO LIGHT
No gating received
No diagnostic feedback
1
1
1
1
Figure 5.10 – SGCT diagnostics
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