Schneider Electric HRB1684301-01 user manual Logic alarms, Phase loss, Leading PF, Lagging PF

Chapter 10—Alarms PowerLogic™ PM5500 series user manual

Leading PF

The Leading PF alarm monitors an over setpoint condition.

0

IV

-1

I

0

III

+1

II

0

ΔT1

ΔT2

ΔT3

EV1

APickup setpoint

BDropout setpoint

∆T1 Pickup delay period (in seconds)

EV1 Start of alarm condition

EV2

∆T2 Dropout time delay (in seconds)

EV2 End of alarm condition

∆T3 Alarm duration (in seconds)

Lagging PF

The Lagging PF alarm monitors an under setpoint condition.

0

IV

-1

I

0

III

+1

II

0

ΔT3

ΔT2

ΔT1

EV1 EV2

APickup setpoint

BDropout setpoint

∆T1 Pickup delay period (in seconds)

EV1 Start of alarm condition

∆T2 Dropout time delay (in seconds)

EV2 End of alarm condition

∆T3 Alarm duration (in seconds)

Phase loss

The phase loss alarm is an under setpoint alarm. It monitors the voltages on a 3-phase system and triggers the alarm when one or two phases fall below the pickup setpoint setting and remains there long enough to satisfy the pickup time delay period. When all of the phases rises above the dropout setpoint setting and remains there long enough to satisfy the dropout time delay period, the alarm condition is set to OFF.

Logic alarms

The meter supports up to 10 logic alarms (Logic Alarm 1 to 10). A logic alarm is used to monitor up to four different inputs or parameters. The logic alarm is tripped when the individual states of all the inputs (A, B, C, D) cause the output (Y) of a logic operation to be true.

The logic alarm inputs can only be linked using software.

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