Long Start
The Long Start function detects when a motor remains in the Start state for an excessive period of time.
If enabled, this protection function triggers a Long Start trip when the motor is in the Start state, and one of the following conditions occur during the specified Long Start Trip Delay:
-
Average current too low: the average current remains below the specified Long Start Trip Level
-
Average current too high: the average current rises above the specified Long Start Trip Level but does not fall below it again.
Long Start Trip
|
I1 |
Phase 1 Current |
I2 |
Phase 2 Current |
|
I3 |
Phase 3 Current |
T |
Long Start Trip Delay |
|
A |
Iavg |
B |
Iavg ≥ 30% |
|
C |
Iavg ≤ Long Start Trip Level |
D |
Iavg ≥ Long Start Trip Level |
|
E |
# of Crossings = 1 |
F |
Long Start Trip |
Average Current Continuously Exceeds the Long Start Trip Level (1 Crossing)
|
G |
Long Start Trip Level |
H |
Long Start Trip Delay (in Start State) |
|
I |
Current |
Ir |
Rated Current |
|
t |
Time |
Average Current Does Not Reach the Long Start Trip Level
|
G |
Long Start Trip Level |
H |
Long Start Trip Delay (in Start State) |
|
I |
Current |
Ir |
Rated Current |
|
J |
Run State |
t |
Time |