What are some common causes of soft starter failure?
Common faults of soft starter
Common faults of soft starters include:
Phase loss fault is reported when starting. The fault light is on but the motor does not respond. The reason may be that the starting method is wrong (the main power supply should be sent first, then the control power supply), the power supply is missing a phase or the output end is not connected to a load.
The bypass contactor is not adsorbed. After starting, the bypass contactor does not close. The reason may be that the protection device setting is too small, the parameter settings are unreasonable, or the control circuit is in poor contact.
Jump air switch. Occasionally, the air switch may trip. The reason may be that the long delay setting value of the air switch is too small, the selection does not match, or the starting voltage parameter is set too high.
The display screen has no display or garbled characters. Soft starter not working. The reason may be that external vibration causes internal wiring to loosen or the control board fails.
The thyristor is short-circuited or the filter board is broken down and short-circuited. The soft starter doesn't work and the motor doesn't respond. The reason may be abnormal motor or grid voltage.
Start timeout. The soft starter stopped working. The reason may be unreasonable parameter setting or starting at full load.
Solving these faults usually requires checking the power supply, adjusting parameters, checking control circuits, replacing damaged parts or resetting parameters.