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92 HRB1684301-01
Chapter 10—Alarms PowerLogic™ PM5500 series user manual
Leading PF
The Leading PF alarm monitors an over setpoint condition.
Lagging PF
The Lagging PF alarm monitors an under setpoint condition.
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.
A Pickup setpoint ∆T2 Dropout time delay (in seconds)
B Dropout setpoint EV2 End of alarm condition
∆T1 Pickup delay period (in seconds) ∆T3 Alarm duration (in seconds)
EV1 Start of alarm condition
A Pickup setpoint ∆T2 Dropout time delay (in seconds)
B Dropout setpoint EV2 End of alarm condition
∆T1 Pickup delay period (in seconds) ∆T3 Alarm duration (in seconds)
EV1 Start of alarm condition
ΔT3
ΔT2
ΔT1
EV1
EV2
II
IV
I
III
0
-1
0
+1
0
II
IV
ΔT3
ΔT2
ΔT1
EV1
EV2
I
III
0
-1
0
+1
0