Low Limit For Measuring Current Undershot - Siemens Simatic ET 200SP Manual

The following table shows the parameter assignment for the example:
Table 14- 15 Parameter assignment
Parameter
Diagnostics overload
Nominal value current
Current transformer primary current
Current transformer secondary current
Tolerance factor overcurrent
Tolerance time overcurrent
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.
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Manual, 07/2018, A5E42674880-AA
Enable
2000 A
5000 A
5 A
20%
40000 ms
Interrupts/diagnostic alarms
14.4 Diagnostics response
125