6.2.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of current circuit supervision can be described by using a module
diagram. All the modules in the diagram are explained in the next sections.
GUID-A4F2DBEE-938F-4961-9DAD-977151DDBA13 V1 EN
Figure 313: Functional module diagram
Differential current monitoring
Differential current monitoring supervises the difference between the summed
phase currents I_A, I_B and I_C and the reference current I_REF.
The current operating characteristics can be selected with the Start value setting.
When the highest phase current is less than 1.0 xIn, the differential current limit is
defined with Start value. When the highest phase current is more than 1.0 xIn, the
differential current limit is calculated with the formula:
MAX I A I B I C Startvalue( _ , _ , _ ) ×
GUID-A0C500CA-4A1A-44AA-AC14-4540676DD8CB V2 EN (Equation 77)
The differential current is limited to 1.0 xIn.
1YHT530004D05 D Section 6
Supervision functions
615 series 581
Technical Manual
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