Undercurrent
The Undercurrent function detects unexpected low current consumption during the Run state. This condition is typically associated with motors running free, without a load—for instance, if a drive belt or shaft has broken.
If enabled, this protection function performs the following:
-
Signals an Undercurrent Alarm when the average phase current remains below the specified Undercurrent Alarm Level
-
If the motor is in the Run state, triggers an Undercurrent Trip when the average phase current remains below the specified Undercurrent Trip Level, for a time longer than the specified Undercurrent Trip Delay
Undercurrent Trip and Alarm
|
I1 |
Phase 1 Current |
I2 |
Phase 2 Current |
|
I3 |
Phase 3 Current |
A |
Iavg |
|
B |
Iavg ≤ Undercurrent Alarm Level |
C |
Iavg ≤ Undercurrent Trip Level |
|
D |
Run State |
E |
Undercurrent Alarm |
|
F |
Undercurrent Trip |
T |
Undercurrent Trip Delay |