Electrex X3M, Руководство пользователя

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5.1.2.5 Alarm Configuration
The Instrument is equipped with two alarms that are triggered by a programmable threshold on anyone of
the measured parameters.
The types of alarm available are: maximum, minimum and 1-of-3.
A minimum alarm is triggered when the selected parameter is lower than the alarm threshold.
A maximum alarm is triggered when the selected parameter exceeds the alarm threshold.
A 1-of-3 alarm is triggered when anyone of the phase readings, whichever the phase involved, trespasses
the alarm threshold – this alarm can be either maximum or minimum. On a 1-of-3 current alarm, the
threshold is expressed as percentage (rather than a value) that stands for the unbalance between the
phases. The alarm therefore triggers when the percent difference between two of the three phases exceeds
the threshold; it is calculated as 100 x (I
max
– I
min
)/I
max
.
All alarms allow also the setting of an hysteresys and a delay time.
The
hysteresys
(in percent) sets the difference between the triggering threshold and the end threshold (this
prevents repeated alarm triggering when the reading oscillates around the trigger value). Example: a 5%
hysteresys on a threshold of 100, triggers the alarm when the reading exceeds 100 but it will switch off the
alarm when the reading becomes lower than 95.
The
delay time
sets a time delay for triggering on the alarm after its actual occurrence (or triggering off after
its actual end).
The alarm setup procedure is activated from the output configuration screen or at the end of page
configuration using the button or the
button.
The fields meaning of Alarm 1 is as follows:
(A) Alarm No. identification (
AL1
= alarm 1 that may be associated to output 1)
(1)Parameter type applying to Alarm 1. The possible choices are:
-- Disabled
U Voltage
f Frequency
I Current
P Active
Power
Q Reactive Power
S Apparent Power
λ
(PF) Power Factor
THD
U
Total Harmonic Distortion (voltage)
THD
I
Total Harmonic Distortion (current)
(2) Quantity definition: The possible definitions are:
Average star value (voltage, current and THD only).
Average system voltage (voltage and voltage THD only)
Neutral value (current only)
Three phase power (only on active, reactive, apparent power)