Excessive Start Time
Description
The excessive start time protection is necessary when the motor takes more time to start than the preset time. The motor draws high current at the starting time (five to six times of Full Load Current). If the motor continues to draw higher current even after the starting time, it causes insulation loss and burning of the windings.
RUN state of the motor is detected by RUN threshold parameter of the excessive start time settings.
If the excessive start time function is enabled, LTMT main unit triggers the trip, if motor state is START and the predefined time delay is elapsed.
If the Excessive Start Time function is disabled, LTMT main unit detects the motor state as RUN, after the predefined time delay has elapsed.
Parameter Setting
The excessive start time function has the following configurable settings:
|
Parameter |
Setting range |
Default Value |
|---|---|---|
|
Function |
|
Disable |
|
Time Delay |
0.1–6000.0 s in step of 0.1 s |
10 s |
|
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 |
|
Run Threshold |
80 to 300% of IFLC in step of 1% |
100% of IFLC |