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.
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| 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.
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|
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| 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 | ||