Chapter 6—Alarms 63230-300-212
Alarm Conditions and Alar m Numbers April 2001
©20 01 Schneider Electric All Rights Reser ved
98
054 LeadingPower Factor
Theleading power factoralarm will occur when the test registervalue becomes more leadingthan
thepickup setpoint (closerto 0.010) and remains moreleading long enough tosatisfy the pickup
delay period. When the value be comes equal to or less leading th an the dropout setpoint, that is
1.000,and remainsless leading forthe dropout delayperiod, the alarm will dropout.Boththe pickup
setpointand the dropoutsetpoint must be positivevalues representingleading power factor.Enter
setpoints as integer valu es representing power factor in tho usandths. For example, to define a
dropout setpoint o f 0.5, enter 500. Del ays are in hundreds of mi lliseconds.
055 LaggingPower Factor
Thelagging power factoralarm will occur when the test registervalue becomes more laggingthan
thepickup setpoint (closerto –0.010) and remainsmore lagging long enoughto satisfy the pickup
delay period. When the value be comes equal to or less lagging th an the dropout setpoint, that is.
1.000and remains lesslagging for the dropoutdelay period,the alarm will dropout. Boththe pickup
setpointand the dropoutsetpoint must be positivevalues representinglagging power factor.Enter
setpoints as integer valu es representing power factor in tho usandths. For example, to define a
dropout setpoint o f –0.5, enter 500. Delays are in hu ndreds of milliseconds.
Disturbance
080 Voltage/Current Swell
The voltage and current swe ll alarms will occur whe never the continuous rms c alculation is above
thepickupsetpoint and remainsabove the pickupsetpoint forthe specified numberof cycles. When
the continuous rms calc ulations fall below the dropout set point and remain below the setpoin t for
the specified number of cy cles, the alarm will dropout .Pi ckup and dropout setpoints ar ep ositive
anddelays are in cycles.
090 Voltage/Current Sag
The voltage and current sag ala rms will occur whenever the conti nuous rms calculation is below
thepickup setpointand remains belowthe pickup setpointfor the specifiednumber of cycles.When
thecontinuous rms calculationsrise above thedropout setpoint andremain above the setpointfor
thespecified number of cycles,the alarm will dropout. Pickup and dropoutsetpoints are positive
anddelays are in cycles.
Digital
060 DigitalInput On
The digital input transiti on alarms will occur whe nevert he digital input changes fr om off to on. The
alarmwill dropout when the digitalinput changes backto off from on. The pickupand dropout
setpointsand delays do notapply.
061 DigitalInput Off
Thedigital input transitionalarms will occur wheneverthe digital inputchanges from on to off.The
alarmwill dropout when the digitalinput changes backto on from off. Thepickup and dropout
setpointsand delays do notapply.
070 Unary T his is a internal signa l from the circuit moni tor and can be used, for examp le, to alarm at the end
ofan interval or when the circuitmonitor is reset. Thepickup and dropout delaysdo not apply.
Boolean
100
Logic AND The AND alarm will occur when
all
ofthecombinedenabledalarmsaretrue(upto4).Thealarm
willdropout when
any
oft heenabled alarms drops out.
101
Logic NAND TheNAND alarm will occurwhen

any,butnot all,

or

none

oft he combined enabled alar ms are true.
Thealarm will dropout when
all
ofthe enabled alarms drop out, or
all
are
true
.
102
Logic OR The OR a larm will occur when
any
ofthe combined enabled alarmsare true (up to 4). The alarm
willdropout when
all
of theenabled alarms are

false

.
103
Logic NOR The NOR alarm w ill occur when

none

oft he combined enable d alarms are t rue (up to 4). T he alarm
willdropout when
any
oft heenabled alarms are
true
.
104
Logic XOR The XOR alarm will occurwhen

only one

of the combined enabled alar ms is true (up to 4). The
alarmwill dropout when

theenabled alarm drops out

or when more than one al arm becomes
true
.
Table 6 –4: Alarm Types
Type Description Operation