GE Mark VIeS - Total Current Feedback Unhealthy; Internal Reference Current Unhealthy; Individual Current too High Relative to Total Current

46-47
Description Output [ ] total current feedback unhealthy
Possible Cause
• Commanded output is beyond the range of the output.
• Field wiring problem
• Field device problem
• Open loop or too much resistance in the loop.
Solution
• Verify that the commanded output is within the range of the output.
• Confirm the correct I/O pack 28 V input power.
• Check the field wiring and the component.
• Replace the I/O pack.
48-49
Description Output [ ] Internal reference current unhealthy
Possible Cause I/O pack failure
Solution
• Confirm the correct I/O pack 28 V input power.
• Replace the I/O pack.
66-67
Description Output [ ] Individual current too high relative to total current
Possible Cause In a TMR setup, the individual current feedback is greater than ½ the total current feedback + TMR_
SuicLimit.
• The TMR_SuicLimit is set too low.
• Hardware failure causing one I/O pack to drive too much output current
Solution
• Verify that the value of TMR_SuicLimit is set correctly.
• Replace the I/O pack.
102 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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