Help needed: Old welding supply

[m***@gmail.com]

Hello,

Sorry if I am off-topic in this thread, Norwegian language is terra
incognita for me. ;)

Here in sunny Croatia my friend got ancient welding supply for his
hobby.
It is a big orange box of undetermined age ('70--'80s), with nameplate
saying:

UNITOR A/S Oslo
type TR 220
input: 160V 50Hz
output: 30-220A 60/78V

For what it is, it is not (probably) worth the trouble of twiddling
around.
But friend is determined to make it work ;). As I can see, windings
are
in good condition.
The problem is obvious, supply voltage of 160V. (That is why it was a
gift to him ;) )
Was it sometimes in past a standard voltage in NO?

Onto optimistic side of story:
Input side terminal has two rows of six bolts for voltage selection,
but the terminal is only number coded, 1-12.

Could someone please help me (us) with some experience, pointer,
manual or suggestion on wiring scheme.

Thanks.
J.

[Mr Grab]

Post by m***@gmail.com
For what it is, it is not (probably) worth the trouble of twiddling
around.
But friend is determined to make it work ;). As I can see, windings
are
in good condition.
The problem is obvious, supply voltage of 160V. (That is why it was a
gift to him ;) )
Was it sometimes in past a standard voltage in NO?

No. Have never been. It is and have as far I know always been 220V.

[Arne Hamre]

Post by Mr Grab

Post by m***@gmail.com
For what it is, it is not (probably) worth the trouble of twiddling
around.
But friend is determined to make it work ;). As I can see, windings
are
in good condition.
The problem is obvious, supply voltage of 160V. (That is why it was a
gift to him ;) )
Was it sometimes in past a standard voltage in NO?

No. Have never been. It is and have as far I know always been 220V.

Actually 230V +/- 10%. Not that it would make any difference if you need
160V. :(

[Tor Halle]

Post by m***@gmail.com
Hello,
Sorry if I am off-topic in this thread, Norwegian language is terra
incognita for me. ;)
Here in sunny Croatia my friend got ancient welding supply for his
hobby.
It is a big orange box of undetermined age ('70--'80s), with nameplate
UNITOR A/S Oslo
type TR 220
input: 160V 50Hz
output: 30-220A 60/78V
For what it is, it is not (probably) worth the trouble of twiddling
around.
But friend is determined to make it work ;). As I can see, windings
are
in good condition.
The problem is obvious, supply voltage of 160V. (That is why it was a
gift to him ;) )
Was it sometimes in past a standard voltage in NO?
Input side terminal has two rows of six bolts for voltage selection,
but the terminal is only number coded, 1-12.
Could someone please help me (us) with some experience, pointer,
manual or suggestion on wiring scheme.

This is normally a straight transformer.
You could use a variac on the socondary winding (output) and applying the
60/78 (lets say 70 V?) Volts and thereafter measure the voltage on the input
terminals to see what the combination must be to get 230V. You dont need a
big variac to do this.

These old transformers are far to good to throw away as they are normally
designed for a 100% intermittence, meaning they can weld continously.
Newer, more "modern" transformer for the commercial market may be as bad as
10% intermittence. Real crap imho.

It could also be that 160 is a minimum rated supply voltage. Cords can be
real long with a significant voltage drop in workshops, shipyard aso.


Tor