Interrupts/diagnostic alarms
14.4 Diagnostics response
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
116 Manual, 07/2018, A5E42674880-AA
Voltage swell of the voltage half-wave value
Introduction
Voltage swells are short-term increases in the line voltage which can occur, for example,
when switching off large consumers.
With the parameter "Number of cycles for analysis" you define how many measuring cycles
the voltage swell must apply at until the module reports the voltage swell. The module
reports the diagnostics "Power quality". The module also sets the qualifier bit 6 for the
respective phase in data record DS 160 (Page 259). If the voltage lies below the limit for
voltage swell again, the module sets the diagnostics "Power quality" again and resets the
qualifier bit 6 again.
The AI Energy Meter HF returns the maximum value and the duration of the voltage swell,
e.g. in data record 160. The duration is determined exactly to ± 2 cycles.
In the event of voltage swell again, only the diagnostics "Power quality" is reported again and
the duration, and if applicable, the maximum voltage swell value is updated.
Calculation of voltage swell limit value
The Voltage swell limit value is the value from which level of voltage the AI Energy Meter HF
recognizes a voltage swell.
The "Voltage swell limit value" is calculated by the following formula:
Voltage swell limit = "Nominal value voltage" + ("Voltage swell limit [%]" × "Nominal value
voltage")
The "Nominal value voltage" is the primary voltage at the operating point.
The following table shows the necessary parameters:
Table 14- 8 Parameter assignment
Power quality analysis functions
Number of cycles for analysis
Diagnostics power quality
Determination of voltage swell and dip Enable
Voltage swell limit 1 ... 1000%
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