Customer has a shop on the same single phase, 50kVA POCO transformer as his house.
The shop does tire repair with an autoclave. This requires a large cu. ft. of compressed air to 85psi.
An Ingersoll Rand SSR-EP25SE 25HP Rotary Screw Air Compressor served by an Add-A-Phase, provides part of the air requirement.
The POCO three phase line extension was quoted $40K+. A rotary phase converter would also be expensive.
The LRA on the screw is 540A @ 3P, 240V.
I believe this starting current is the root of all his power quality complaints over the last five years.
I thought the automatic unloader might be an issue and asked him to start @ 0psi. He reported this was not going to work for his operation.
There are a lot of different things that could be done, but all are expensive.
Can a soft start be used on this compressor, that is served by the Add-A-Phase? If the Add-A-Phase was not functioning correctly, what would the symptoms be?
The POCO is willing to increase the transformer to a 75kVA.
The shop does tire repair with an autoclave. This requires a large cu. ft. of compressed air to 85psi.
An Ingersoll Rand SSR-EP25SE 25HP Rotary Screw Air Compressor served by an Add-A-Phase, provides part of the air requirement.
The POCO three phase line extension was quoted $40K+. A rotary phase converter would also be expensive.
The LRA on the screw is 540A @ 3P, 240V.
I believe this starting current is the root of all his power quality complaints over the last five years.
I thought the automatic unloader might be an issue and asked him to start @ 0psi. He reported this was not going to work for his operation.
There are a lot of different things that could be done, but all are expensive.
Can a soft start be used on this compressor, that is served by the Add-A-Phase? If the Add-A-Phase was not functioning correctly, what would the symptoms be?
The POCO is willing to increase the transformer to a 75kVA.
