screw compressor for air ???

ksor

ksor

Active User
Registered
Joined
Jan 4, 2012
Messages
108
(why is ENTER or RETURN not working on this site ????)
I'm working on getting this monster going for my little
workshop - look it here: http://kelds.weebly.com/skruekompressor.html (you can translate by choosing language to the right under the menu line !)

I plan to mount it with a small tank - about 50 liters - and
I have tried it for testing the configuration !

When it starts it fills up the tank very fast and then stops - it's OK - I beleave.

When I starts to use some of the air, a sort of "humming" is comming up and
the motor run very slowly, while filling up then tank again OR keep up with my
using/spending of air.

Is that "normal" behavior or way of using such a compressor ?
Can it be damaged in any way because I'm NOT using all it's capacity ?
 
ksor said:
When it starts it fills up the tank very fast and then stops - it's OK - I beleave.

When I starts to use some of the air, a sort of "humming" is comming up and
the motor run very slowly, while filling up then tank again OR keep up with my
using/spending of air.

Is that "normal" behavior or way of using such a compressor ?
Can it be damaged in any way because I'm NOT using all it's capacity ?
Click to expand...

Your motor continues to run all the time right? That's how all the ones I've seen are.
Some have a setting to let the motor shut down after "X" minutes of inactivity.

When the pressure drops, it diverts air into the tank (from bypass mode), so you'll hear the motor lug down under load.
When you first fire it up, there won't be pressure, so no load against the motor.

Hook up an amp-clamp to the input power, and make sure you're only drawing the rated amount (loaded, unloaded, etc).
Watch for inrush current at start up.

I told a guy this who had a screw compressor on his truck. Couldn't figure out why his generator kept stalling. Just wouldn't believe me that there was SO much current at start up that it was nearly frying the gen set! I was working for Onan at the time. Made note on his file to void any future warranty. ;)
 
Dr.Fiero said:
Your motor continues to run all the time right? That's how all the ones I've seen are.
Some have a setting to let the motor shut down after "X" minutes of inactivity.

When the pressure drops, it diverts air into the tank (from bypass mode), so you'll hear the motor lug down under load.
When you first fire it up, there won't be pressure, so no load against the motor.

Hook up an amp-clamp to the input power, and make sure you're only drawing the rated amount (loaded, unloaded, etc).
Watch for inrush current at start up.

I told a guy this who had a screw compressor on his truck. Couldn't figure out why his generator kept stalling. Just wouldn't believe me that there was SO much current at start up that it was nearly frying the gen set! I was working for Onan at the time. Made note on his file to void any future warranty. ;)
Click to expand...

Yeah, the motor run continuesly but very slowly - I've not seen it shut down in my short test runs.

About the current at start up I can say that the compressor is rated to connect to a 400V 32A outlet, but I only have 400V 16A :nuts:, so I programmed it to start slowly :thinking: and it DO run my test runs - AND I will never ever be able to use its huge capacity so I think it wil do the job for me.

Today I'm gonna mount it with tank pipes and outlets - so I'm very excited how it will run. :))
 
Hello Ksor
Congratulations on acquiring a fine air compressor.
The Worthington screw compressors are widely used in industrial situations today - often with two or more ganged together for capacity control. Screw compressors are smooth, relatively quiet, efficient, and long-lived if properly maintained.
The Rollair 1500 is rated at 102 m^3/hr at 8 bar. Should easily keep up to you plasma cutter - in fact it might keep up with two or three plasma cutters.
The 1500V which you have, has a variable speed control on the motor - a 15 HP VFD is suspect.
I have not seen the V version before. If you don't have the operating and maintenance manual, you may want to get a copy. I see that representative in Denmark is:
Steven Kjell

Business Manager
Nordic Customer Center
http://www.biab-tryckluft.se

  • contact_mobile_tcm1049-633148.gif+46 70 318 70 07

They should be able to help you with questions on the starting and low speed operating modes.

A couple of general notes on rotary screw compressors:
  1. Clean inlet air is required so as not to contaminate the oil - the 1500 has a built-in inlet filter. Be sure to check it from time to time and replace when needed
  2. The oil will have to be changed depending on usage and age - I am not sure how often with this machine, see the maintenance manual
  3. I don't believe your model has an integral air dryer (I think that would be a model with a "T"). For the plasma cutter, perhaps just a line mounted "water separator" is all that you need
  4. The 1500 has an integral oil separator and filter - but there will still be trace amounts of oil in the delivered air. I don't think this is an issue for the plasma cutter, but don't use it for breathing air in one of those air-purge welding helmets. Also, I think there is an oil drain on the final filter that needs to be drained from time to time (see manual).
  5. As you know, there is a separate fan for the oil and the air cooing coils. There should be a filter for this airstream to keep the finned coils clean. I believe this filter can be cleaned with a Shop Vac from time to time to keep good air flow through the coils.

Best Regads,
Terry S.
 
twstoerzinger said:
Hello Ksor
Congratulations on acquiring a fine air compressor.
The Worthington screw compressors are widely used in industrial situations today - often with two or more ganged together for capacity control. Screw compressors are smooth, relatively quiet, efficient, and long-lived if properly maintained.
The Rollair 1500 is rated at 102 m^3/hr at 8 bar. Should easily keep up to you plasma cutter - in fact it might keep up with two or three plasma cutters.
The 1500V which you have, has a variable speed control on the motor - a 15 HP VFD is suspect.
I have not seen the V version before. If you don't have the operating and maintenance manual, you may want to get a copy. I see that representative in Denmark is:
Steven Kjell

Business Manager
Nordic Customer Center
http://www.biab-tryckluft.se

  • contact_mobile_tcm1049-633148.gif+46 70 318 70 07

They should be able to help you with questions on the starting and low speed operating modes.

A couple of general notes on rotary screw compressors:
  1. Clean inlet air is required so as not to contaminate the oil - the 1500 has a built-in inlet filter. Be sure to check it from time to time and replace when needed
  2. The oil will have to be changed depending on usage and age - I am not sure how often with this machine, see the maintenance manual
  3. I don't believe your model has an integral air dryer (I think that would be a model with a "T"). For the plasma cutter, perhaps just a line mounted "water separator" is all that you need
  4. The 1500 has an integral oil separator and filter - but there will still be trace amounts of oil in the delivered air. I don't think this is an issue for the plasma cutter, but don't use it for breathing air in one of those air-purge welding helmets. Also, I think there is an oil drain on the final filter that needs to be drained from time to time (see manual).
  5. As you know, there is a separate fan for the oil and the air cooing coils. There should be a filter for this airstream to keep the finned coils clean. I believe this filter can be cleaned with a Shop Vac from time to time to keep good air flow through the coils.

Best Regads,
Terry S.
Click to expand...

Hi twstoerzinger

In fact I got the manuals from this company in Sweden and I know tha capacity is way beyond what I need ... but I should pay MORE for a new much smaller one, so I prefere this choice.

Tomorrow I'll screw the pipes together and then try to start it up and see how it reacts to my "use" of air
 
You must log in or register to reply here.
Back
Top