1MAC050144-MB C
Section 6
Supervision functions
615 series ANSI
461
Technical Manual
Figure 245:
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. In this mode, the startup condition is detected by monitoring the TRMS
currents. In the “IIt & stall” mode, the function also checks for motor stalling by
monitoring the speed switch.
In the “IIt & stall, CB” mode, the function calculates the thermal stresses of the motor
during the startup condition. The startup condition is monitored in addition to the circuit
breaker status. In the “IIt & stall, CB” mode, the function also checks for motor stalling by
monitoring the speed switch.
When the measured current value is used for startup supervision in the “IIt” and “IIt &
stall” modes, the module initially recognizes the de-energized condition of the motor when
the values of all three phase currents are less than
Motor standstill A
for longer than 100
milliseconds. If any of the phase currents of the de-energized condition rises to a value
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