Omron K7DD User Manual page 76

4 K7DD Function
 Feature Values to Be Selected
The feature values to be selected for monitoring by the simplified threshold setting function are the
following 5 types among the 9 types displayed at the Monitoring Level.
• R.M.S. Voltage
• Voltage Fundamental Amplitude
• R.M.S. Current
• Current Fundamental Amplitude
• Active Power
Among them, the feature values selected to be necessary for monitoring by the teaching function
are called "monitored features". The threshold of the feature not selected is set to the maximum
value*1. In addition, the thresholds of features other than these 5 types are also set to the maximum
value.
*1. The maximum value for each feature is "32761". The decimal point position changes depending on the
setting range.
 Critical/Warning Threshold Calculation and Alarm Threshold Calculation
Sensitivity
The thresholds for the monitored and selected feature values are calculated and set according to the
alarm threshold calculation sensitivity.
The default value for the alarm threshold calculation sensitivity is 80%. The value is set to 80% so
that the alarm output is issued at a slightly earlier timing, compared to the condition where the
maximum abnormal value has been taught.
Feature
value
Normal data
 Adjustment of Critical/Warning Thresholds
Upon completion of teaching, the critical and warning thresholds are calculated to the same value.
If the device is still operational when the alarm is issued in actual operation, increase the critical
threshold accordingly. On the other hand, if you want to issue an alarm at an earlier timing, decrease
the warning threshold. In either case, it is advisable to make adjustments so that the alarm can be
notified at two different timings.
4 - 8
Alarm threshold calculation sensitivity (%)
Abnormal data
100%
80%
The critical/warming threshold is
calculated at the teaching end.
150%
Critical/Warning
threshold
Power Line Data Generator User's Manual (N233)