Softstarter FAQ's

Answer:

When using semi-conductor fuses a type 2 co-ordination can be achieved. It is possible to use an MCCB or MMS instead but then with a type 1 co-ordination.

Answer:

The minimum and maximum value where we can guarantee full function is -15% to +10% of the rated value.

Answer:

It is possible with all types of ABB softstarters as long as the curve is sinusoidal.

Answer:

If the current transformers of the softstarter can be installed so that the measuring can be performed when by-passed a separate relay is not required; otherwise yes.

Answer:

Possible reasons can be one of these or in a combination:
-too low current limit
-too long ramp time
-too low initial voltage
-wrong tripping class on the overload
-wrong setting on the overload

Answer:

No, this is not possible since there will be no current going through the softstarter and some types will also indicate loss of load.

Answer:

If the main contactor is closed too late the softstarter will indicate this as a phase loss fault. Delay the start signal to the softstarter by approx. 0.5 sec. to solve this phenomenon.

Answer:

 Main contactor: always use AC-3.
By-pass contactor: it is possible to use AC-1.

Answer:

Reduction of power loss

Answer:

Pumps and conveyor belts loaded with fragile products are the two main applications suitable for soft stop.