PowerLogic™ PM5500 / PM5600 / PM5700 series – User manual PDF
HRB1684301-18

Power factor (PF) alarms

You can set up a Leading PF or Lagging PF alarm to monitor when the circuit’s power factor goes above or below the threshold you specify.

The Leading PF and Lagging PF alarms use the power factor quadrants as the values on the y-axis, with quadrant II on the lowest end of the scale, followed by quadrant III, quadrant I, and finally quadrant IV on the highest end of the scale.

Quadrant

PF values

Lead/Lag

II

0 to -1

Leading (capacitive)

III

-1 to 0

Lagging (inductive)

I

0 to 1

Lagging (inductive)

IV

1 to 0

Leading (capacitive)

Leading PF alarm

The Leading PF alarm monitors an over setpoint condition.

The image illustrates the behavior of a Leading Power Factor (PF) alarm over time, showing how the alarm is triggered and cleared based on signal thresholds and time delays. The x-axis represents time, while the y-axis reflects monitored signal levels. Key points include the pickup setpoint (A) and dropout setpoint (B), which define the thresholds for activating and deactivating the alarm. Event markers EV1 and EV2 indicate the start and end of the alarm condition, respectively. Time intervals are labeled as ΔT1 for pickup delay, ΔT2 for dropout delay, and ΔT3 for total alarm duration.
A Pickup setpoint ΔT2 Dropout time delay (in seconds)
B Dropout setpoint EV2 End of alarm condition
ΔT1 Pickup delay period (in seconds) ΔT3 Alarm duration (in seconds)
EV1 Start of alarm condition    

Lagging PF alarm

The Lagging PF alarm monitors an under setpoint condition.

The image illustrates the behavior of a Lagging Power Factor (PF) alarm over time, which monitors an under setpoint condition. The x-axis represents time, while the y-axis reflects the monitored signal level. Key thresholds include the pickup setpoint (A) and dropout setpoint (B), which define when the alarm is activated and deactivated. Event markers EV1 and EV2 indicate the start and end of the alarm condition, respectively. Time intervals are labeled as ΔT1 for the pickup delay, ΔT2 for the dropout delay, and ΔT3 for the total alarm duration.
A Pickup setpoint ΔT2 Dropout time delay (in seconds)
B Dropout setpoint EV2 End of alarm condition
ΔT1 Pickup delay period (in seconds) ΔT3 Alarm duration (in seconds)
EV1 Start of alarm condition    

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