3. Operation and Display
EM-GU User’s Manual
14
3.3 Fault Diagnosis and Solution
The soft start writes the protection condition into the program when it is detected and it may trip. The soft start
response depends on the protection level.
Some of these protection responses cannot be adjusted by the user. These trips are usually caused by external
events (e.g. phase loss) or may be caused by internal soft start faults. There are no parameters associated with
these trips and they cannot be set to ignored.
If the soft start trips, you will need to identify and clear the conditions that triggered the trip and reset the soft start
before it can be restarted. To reset the starter, press the (stop/reset) key on the keypad or activate the "stop/reset
remote input".
The following table shows the protection mechanisms and possible causes of tripping of the soft start. Some of the
settings can be adjusted using the protection level, while others are built-in system protections and cannot be set
or adjusted.
Fault Name
Possible causes and solutions
Input phase loss
1. When the start command is issued, soft starter one phase or multiple phases are not
powered. Check whether the main circuit is powered or whether the SCR or
thyristor
is
damaged and whether the signal cable has poor contact.
2. Main board is faulty.
Related parameters: No parameter adjustment.
Output phase loss
1. Check whether the SCR or
thyristor
is damaged.
2. Motor cable has one phase or multiple phases open circuit. Please check whether the
motor cable is open circuit.
3. Main board is faulty.
。
Related parameters: No parameter adjustment.
Running OL
1.The load is too heavy. Please replace the soft start with a more powerful one.
2. The parameters are not set correctly. Please adjust the parameters.
Related parameters: F19, F39
Under Load
1.The load is too small.
2. The parameters are not set correctly. Please adjust the parameters.
Related parameters: F30, F31, F45
Over Heat
1. Please check whether the temperature switch is faulty.
2. Fan not turning, please check whether the fan is working properly.
3. The soft start has been working for too long, stop the machine and let the soft start cool
down.
Related parameters: F46
Over Volt
1. Input voltage is too high, please check the power supply voltage.
2. The parameters are not set correctly. Please adjust the parameters.
Related parameters: F24
，
F25
，
F42
Over Load
1. Input voltage is too low, please check the power supply voltage.
2. The parameters are not set correctly. Please adjust the parameters.
Related parameters: F26
，
F27
，
F43
Running OC
1.The load is too heavy. Please replace the soft start with a more powerful one.
2. The parameters are not set correctly. Please adjust the parameters.
Related parameters: F22
，
F23
，
F41
Starting OC
1.The load is too heavy. Please replace the soft start with a more powerful one.
