Siemens SIMATIC ET 200SP - Low Limit for Measuring Current Undershot

Interrupts/diagnostic alarms
14.4 Diagnostics response
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Manual, 07/2018, A5E42674880-AA
125
The following table shows the parameter assignment for the example:
Table 14- 15 Parameter assignment
Parameter
Diagnostics overload
Enable
Nominal value current 2000 A
Current transformer primary current
5000 A
Current transformer secondary current
5 A
Tolerance factor overcurrent
20%
Tolerance time overcurrent
40000 ms
If the maximum measured current for the module (12000 A primary current) is exceeded, the
module reports the diagnostics "Overload" as long as the maximum measured current is
exceeded.
After the "Tolerance time overcurrent" of 40000 ms has expired, the module reports the
diagnostics "Overload" as long as the configured "Tolerance value measured current" is
exceeded.
14.4.2.2
Low limit for measuring current undershot
Introduction
With the function "Low limit for measuring current undershot" the AI Energy Meter HF
monitors the low limit of the effective value of the current per phase.
If the low limit for measuring current is undershot, the module sets the current value to 0.
Information as to which current measured values are set to 0 can be found under Basics for
reading measured values (Page 41).
You activate the function by setting the parameter "Low limit for measuring current" > 0%.
Calculation of low limit for measuring current
The low limit for measuring current is calculated with the following formula:
Low limit measured current = "Nominal value current" × "Low limit for measuring current [%]"
The "Nominal value current" is the primary current at the operating point.