4.8.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of the motor startup supervision function can be described with a
module diagram. All the modules in the diagram are explained in the next sections.
GUID-35DD1223-14B2-48BF-ADF4-4A1DF6930314 V1 EN
Figure 273: Functional module diagram
Startup supervisor
This module detects the starting of the motor. The starting and stalling motor
conditions are detected in four different modes of operation. This is done through
the Operation mode setting.
When the Operation mode setting is operated in the "IIt" mode, the function
calculates the value of the thermal stress of the motor during the startup condition.
In this mode, the startup condition is detected by monitoring the TRMS currents.
The Operation mode setting in the "IIt, CB" mode enables the function to calculate
the value of the thermal stress when a startup is monitored in addition to the
CB_CLOSED input.
In the "IIt & stall" mode, the function calculates the thermal stress of the motor
during the startup condition. The startup condition is detected by monitoring the
TRMS currents.
In the "IIt & stall, CB" mode, the function calculates the thermal stress of the
motor during the startup condition but the startup condition is detected by
monitoring the TRMS current as well as circuit breaker status.
In both the "IIt & stall" and "IIt & stall, CB" mode, the function also checks for
motor stalling by monitoring the speed switch.
Section 4 1YHT530004D05 D
Protection functions
522 615 series
Technical Manual
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