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.
The minimum and maximum value where we can guarantee full function is -15% to +10% of the rated value.
It is possible with all types of ABB softstarters as long as the curve is sinusoidal.
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.
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
No, this is not possible since there will be no current going through the softstarter and some types will also indicate loss of load.
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.
Main contactor: always use AC-3.
By-pass contactor: it is possible to use AC-1.
Reduction of power loss
Pumps and conveyor belts loaded with fragile products are the two main applications suitable for soft stop.