Allen-Bradley 1407-CGCM, User Manual, Page: 157 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
Troubleshooting #HAPTER
4ABLE2EACTIVE0OWER#ONTROL0&
3YMPTOM -OST,IKELY#AUSE $IAGNOSTIC!CTION #ORRECTIVE!CTION
Power Factor not at PF setpoint PF not enabled Check input tag
0&?%NED
If not enabled, select appropriate
modes of operation to enable PF
mode
Gain misadjusted Observe response of PF to changes
in PF setpoint If a response is slow, increase gain
Diode failure Use diode monitor if previously
configured or measure/check diodes Replace as required
Excitation limiting active Check UEL/OEL active input Correct UEL/OEL configuration or
change operating point
Power Factor unstable/erratic Gain misadjusted Observe response of PF to changes
in PF setpoint Adjust until a stable response is
observed
Wiring Error Check stability in other control mode
such as Droop If stable in other mode, see above.
Otherwise, check field output wiring
and VT/CT input wiring
4ABLE2EACTIVE0OWER#ONTROL6!2
3YMPTOM -OST,IKELY#AUSE $IAGNOSTIC!CTION #ORRECTIVE!CTION
VARs not at VAR setpoint VAR not enabled Check input tag 6!2?%NED If not enabled, select appropriate
modes of operation to enable VAR
mode
Gain misadjusted Observe response of VAR to
changes in VAR setpoint If a response is slow, increase gain
Diode failure Use diode monitor if previously
configured or measure/check diodes Replace as required
Excitation limiting active Check UEL/OEL active input Correct UEL/OEL configuration or
change operating point
VARs unstable/erratic Gain misadjusted Observe response of VAR to
changes in VAR setpoint Adjust until a stable response is
observed
Wiring Error Check stability in other control mode
such as Droop If stable in other mode, see above.
Otherwise, check field output wiring
and VT/CT input wiring