Questions & Answers

Q6 THE MOTOR DOES NOT ACCELERATE PROPERLY

Start- current control
Has the correct value of Current limit been set?	No	In order for a motor to accelerate successfully on *soft start control* it will need to draw at least 200 to 350% of FLC, depending on the load. Ensure that the current limit is not set too low.
Start- voltage control
Has the pedestal and ramp times been set correctly?	Yes	If the ramp-up is set to VOLTAGE then the user must input the correct values in order to achieve a smooth acceleration to full speed. Pedestal should be 35-40% ramp-up 10-30secs, target 90 to 100%. Other values are possible but may lead to problems.
Yes
Is the motor overloaded?	Yes	If the motor is overloaded the soft starter will attempt to overcome the load problems but the motor may not allow the acceleration to proceed smoothly.
No
Is the power supply weak?	Yes	If the mains power supply is poor the acceleration current may cause the voltage to 'dip' and consequently the soft starter will lose control of the ramp-up.
No
CONTACT YOUR SUPPLIER