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A programmed alarm must be set to "ON" to function properly (general
activation or deactivation of alarms is generated in the alarm mode).
Modifying one or several characteristics of an alarm set to "ON", auto-
matically switches it to "OFF".
Hysteresis Percentage (1, 2, 5 or 10%). A hysteresis value is set to prevent
multiple recordings of an event that goes above the threshold and a certain
percentage below it at times. Example: Alarm threshold is 100 Volts or higher,
hysteresis is 1%. When voltage goes up to 100V, the alarm condition starts,
when it next goes back down to 99V, the alarm condition stops.
Alarm activation (ON or OFF)
Alarm number (1 to 10)
There are 24 parameters to choose from for alarm triggering. They are: Vrms,
Urms, Arms, Vpst, Vcf, Ucf, Acf, Vumb, Aumb, Hz, Akf, Vthd, Uthd, Athd, W,
VAR, VA, DPF, PF, Tan, Vh, Uh, Ah and VAh.
Threshold value for triggering an alarm
Minimum duration from beginning threshold detection to store the alarm
(from 0.01 seconds to 99 minutes)
Less than "<" or greater than ">"
Capture - 3L: capture all phases (1, 2, or 3 depending on hookup selection)
- N: neutral capture
- Σ: total power capture
- Σ/3: average value of 3-phase capture (Σ/2 for 2-phase)
- 0-50 harmonic order available for harmonic event capture
Alarm Programming
Choose the parameters associated with an alarm from the available parame-
ters (phases survey, threshold value and minimum duration filtering can be pro-
grammed).
The programmed hysteresis is common to all alarms.
• Highlight Alarm with the
• Select the modifiable field using the
• Activate or adjust the threshold values using the
modified is shown in bold.)
• Press the
When the alarm is "OFF", the parameters previously used are stored in
memory and reappear if the alarm is selected again.
38
buttons, then press the
button when you have finished setting all the alarm parameters.
button.
buttons.
buttons. (The field to be
Power Quality Analyzer Model 3945-B
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