Locked Rotor
Description
The locked rotor protection function protects the motor during the start of the motor. The locked rotor condition occurs mainly due to excessive load or due to improper connection between the rotor and the shaft. The locked rotor protection function is active only during the start time of the motor.
The locked rotor protection function generates the following signals:
-
Alarm: Any of the three-phase currents of the motor goes above the alarm level during the start of the motor.
-
Trip: Any of the three-phase currents of the motor goes above the pickup level for the specified time delay during the start of the motor.
Parameter Setting
The locked rotor protection function has the following configurable settings:
|
Parameter |
Setting range |
Default value |
|---|---|---|
|
Function |
|
Trip |
|
Pickup |
150–1000% of IFLC in step of 1% |
200% of IFLC |
|
Time Delay |
0.1–6000.0 s in step of 0.1 s |
10 s |
|
Alarm :Level |
150–1000% of IFLC in step of 1% |
200% of IFLC |
|
Reset Mode |
|
DI + Reset Key |
|
Auto-Reset Delay (applicable only if Reset mode is Auto) |
0.0–6000.0 s in step of 0.1 s |
0 s |