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Table 21 - Reactive Power Control - PF
Symptom
Power Factor not at PF setpoint
Power Factor unstable/erratic
Table 22 - Reactive Power Control - VAR
Symptom
VARs not at VAR setpoint
VARs unstable/erratic
Most Likely Cause
PF not enabled
Gain misadjusted
Diode failure
Excitation limiting active
Gain misadjusted
Wiring Error
Most Likely Cause
VAR not enabled
Gain misadjusted
Diode failure
Excitation limiting active
Gain misadjusted
Wiring Error
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Diagnostic Action
Check input tag PF_Ened
Observe response of PF to changes
in PF setpoint
Use diode monitor if previously
configured or measure/check diodes
Check UEL/OEL active input
Observe response of PF to changes
in PF setpoint
Check stability in other control mode
such as Droop
Diagnostic Action
Check input tag VAR_Ened
Observe response of VAR to
changes in VAR setpoint
Use diode monitor if previously
configured or measure/check diodes
Check UEL/OEL active input
Observe response of VAR to
changes in VAR setpoint
Check stability in other control mode
such as Droop
Troubleshooting
Chapter 7
Corrective Action
If not enabled, select appropriate
modes of operation to enable PF
mode
If a response is slow, increase gain
Replace as required
Correct UEL/OEL configuration or
change operating point
Adjust until a stable response is
observed
If stable in other mode, see above.
Otherwise, check field output wiring
and VT/CT input wiring
Corrective Action
If not enabled, select appropriate
modes of operation to enable VAR
mode
If a response is slow, increase gain
Replace as required
Correct UEL/OEL configuration or
change operating point
Adjust until a stable response is
observed
If stable in other mode, see above.
Otherwise, check field output wiring
and VT/CT input wiring
167
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