Schneider Electric HRB1684301-01 Manual De Usuario

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HRB1684301-01

Chapter 10—Alarms

PowerLogic™ PM5500 series user manual

Digital alarms monitor the ON or OFF state of the meter’s digital inputs (S1 to S4).

To prevent false triggers from erratic signals, you can set up a time delay for the digital 
alarm.

NOTE: To prevent filling the alarm log with nuisance alarm trips, the digital alarm is 
automatically disabled if the digital input changes state more than 4 times in one 
second or more than 10 times in ten seconds. See “Digital input setup” on page 72 to 
adjust the Debounce setting for the digital inputs.

Standard (1-Sec) alarms have a detection rate equal to the 50/60 meter cycle, which is 
nominally 1 second if the meter’s frequency setting is configured to match the system 
frequency (50 or 60 Hz). These setpoint-driven alarms monitor certain behaviors, 
events or unwanted conditions in your electrical system.

Many of the standard alarms are three-phase alarms. Alarm setpoints are evaluated for 
each of the three phases individually, but the alarm is reported as a single alarm. The 
alarm pickup occurs when the first phase exceeds the alarm pickup magnitude for the 
pickup time delay. The alarm is active as long as any phase remains in an alarm state. 
The alarm dropout occurs when the last phase drops below the dropout magnitude for 
the dropout time delay. 

Digital Alarm S1

Digital input 1

Digital Alarm S2

Digital input 2

Digital Alarm S3

Digital input 3

Digital Alarm S4

Digital input 4

A

Pickup setpoint (1 = ON)

∆T2

Dropout time delay (in seconds)

B

Dropout setpoint (0 = OFF)

EV2

End of alarm condition

∆T1

Pickup time delay (in seconds)

∆T3

Alarm duration (in seconds)

EV1

Start of alarm condition

EV1

EV2

0

1

ΔT1

ΔT

2

ΔT3

Over Phase Current

Over Current, Ph

0.000 to 99999.000

0 to 99999

A

Under Phase Current

Under Current, Ph

0.000 to 99999.000

0 to 99999

A

Over Neutral Current

Over Current, N

0.000 to 99999.000

0 to 99999

A