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.
Yes, it is possible but not for all types of softstarters.
Pumps and conveyor belts loaded with fragile products are the two main applications suitable for soft stop
The softstarter can normally be operated at a higher ambient temperature during operation if the rated current for the unit is derated according to the manufacturer's recommendation
nxï¿½ <5ï¿½ï¿½ your Ntï¿½ ie5ï¿½ï¿½ nal 8 and and use the Positive as a signal to the Stop/Start terminals
The softstarter does not require a main contactor but ABB recommends the use of one for emergency stop and/or trip of the overload relay. In some applications an MCCB can be used instead of the main contactor