Thermal Overload
The Thermal Overload protection function is based on a thermal model which calculates the used thermal capacity of the motor.
If enabled, this function performs the following:
-
Signals a Thermal Overload Alarm when the motor thermal capacity used exceeds the Overload Alarm Level
-
Triggers a Thermal Overload Trip when the motor thermal capacity used exceeds 100%
The Thermal Reset Threshold parameter sets the percentage below which the motor thermal capacity used must fall, before a thermal overload trip reset is allowed.
Thermal Overload Protection Trip and Alarm
|
I1 |
Phase 1 Current |
I2 |
Phase 2 Current |
|
I3 |
Phase 3 Current |
A |
Motor Thermal Model |
|
B |
Motor Thermal Capacity Used ≥ 100% |
C |
Motor Thermal Capacity Used ≥ Thermal Overload Alarm Level |
|
D |
Thermal Overload Trip |
E |
Thermal Overload Alarm |