Examples Of Operations For Voltage Sag Detection - Omron KE1 User Manual

 Examples of operations for voltage sag detection
The following diagrams ① to ③ show the examples of operations available when the voltage
between R and S is subject to monitoring of voltage sag in 3-phase 3-wire system.
① The voltage (Vrs) between R and S in the 3-phase 3-wire system is lower than the voltage
sag detection voltage (170 V). A voltage sag is determined when the voltage sag duration
(0.02 s) is exceeded.
② A voltage sag alarm is output within 5 ms after the determination.
③ With voltage sag backup in the off state, if the power supply voltage becomes lower than 50
V, alarm output may be turned off less than 1 s.
[Setting items]
Voltage sag backup :
Voltage sag detection function:
Voltage sag detection voltage:
Voltage sag duration:
220 V
170 V
50 V
0 V
RMS value (64 pieces of each waveform)
RMS value (120 pieces of average of 10 waveforms)
50 Hz: Intervals of about 200 ms (24 s)
3-3 Voltage sag (instantaneous voltage drop) detection function
ON or OFF
Vrs
170 V
0.02 s
①
0.02 s
5 ms
②
5 ms
Before voltage sag
150.1 V
150.3 V
：
：
150.0 V
150.2 V
：
：
60 Hz: Intervals of about 166 ms (20 s)
150.0 V
150.1 V
：
：
1 s
③
After voltage sag
149.7V
149.5V
：
：
RMS value (64 pieces of each waveform)
149.9 V
149.7 V
：
：
*1. Backup power supply available
*2. Backup power supply unavailable
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