Bridgeport Series 2 Interact 2 Transformer

[rrossey]

I purchased a pre used Bridgeport Series 2 Interact 2 CNC milling Machine.

It requires 460 volt power supply. My workshop has 600 volt supply, so I have to install a Transformer.

I am located in Montreal and looking for Canadian made Marcus Transformer of 11 KVA.

One of the dealer’s representatives advised not to go for an Auto transformer for CNC machine and recommended a double wound, isolating transformer.

Another dealer suggested to go for a Drive Isolation transformer.

One of my friends told me that he is using an Auto transformer for his CNC machine.

The approximate price quoted for an Auto transformer is US$ 450
Isolating transformer US$ 600
Drive Isolating Transformer US$ 750

I request you to suggest the proper selection of transformer.

Thanks,

R Rossey

[UKRobotics]

I *think* the reason they are advising against the autotransformer is because it provides no isolation which could cause a lot of problems if it were to fail. But, if you are using this just to step down between your supply and the existing bridgeport transformer you might be ok as the existing bridgeport transformer will provide the necessary isolation.

I'm not entirely sure on this so you might want to double check with someone else.

Certainly if you were intending to replace the existing bridgeport transformer with a new one I wouldnt use an autotransformer.

[cp8071]

You could also look into adding just one 600:120 transformer, then connect it's output "backwards" in series with the bridgeports 460 transformer. This would be like a build-it-yourself voltage-bucking-transformer. This 600:120 would probably be smaller and cheaper.

600-120=480 (should be close enough to 460)

CP

[Al_The_Man]

First confirm what is actually running at 460, if you have motors etc running at 460/480 then they are most certainly going to be across the incoming supply so an autotransformer will make no difference as to isolation, I doubt the servo's are running on 460, if not then there will be an internal transformer to isolate them. also there will be a control isolation transformer down to 110v etc.
So these will not matter as far as auto trans. as they will be isolated.
The auto-transformer is acts the same as a buck/boost transformer.
Al.

[machintek]

Check all your transformers. I believe you can reconfigure them to 230VAC. I believe most of them are auto-transformers. The spindle motor also is easy to convert. The only buggers will be the main fuses and spindle motor overload. The current at 230 will be double of what it draws at 460.

George

[rrossey]

Thank you all for the information.

Tomorrow I will check the transformers in the main panel and get back.

R Rossey

[Al_The_Man]

Originally Posted by rrossey Tomorrow I will check the transformers in the main panel and get back.

That may only be worth it if you have 3ph 110/220, rather than 240/120 1ph for lighting, otherwise it would pay to stick to the 600v 3ph with auto trans.
Also the wiring for the main feed from the disconnect and the spindle wiring may need increasing, if going with the 220 3ph.
Al.

[rrossey]

Thanks for the information.

I checked the electric panel, there are two isolation transformers inside, one for the servos and one for the controller.
So I purchased an auto transformer and connected the machine.

Now the next problem:

The machine parameters are lost as the batteries were exhausted.
I replaced the cells.
There are no machine parameters available along with the machine.
I downloaded the parameters from ETSU web site for Heidenhan TNC 155

Are these machine parameters specific to a particular machine or common for Heidenhain TNC 155 Controller?

The CRT display is in German. Can this be changed to English?

Thanks,

R Rossey

[machintek]

Maybe I have a generic set for this machine without going to the office. The parameters configure the control to the machine. Most are generic to a specific machine, but some are machine specific, such as backlash comp and machine travel to each side of the home switch. Yes, one parameter converts it to a english display so you do not have to learn German.

George

[machintek]

BTW, need your email address.

George

[rrossey]

My email addres:

rrossey45@yahoo.com

What is BTW?

R Rossey

[machintek]

BTW: BY THE WAY.
FYI: FOR YOUR INFORMATION

ETC

George