Hi everyone,
I am new to this subject so am hoping someone can enlighten me.
I have been entrusted by a friend to work out if he can use a very old ARO D12a Spot Welder on a single phase supply. Looking at the unit I am puzzled by several points.
The Name Plate says V380/420 which obviously are 3-phase supply values - yet internally the incoming supply wiring (4 HD wires) seems to route as follows............
Earth wire > Chassis (as expected)
Two wires > terminate directly on two poles of the contactor/relay (and also appear to supply the units electrical bits like the Timer etc).
Remaining wire > seems to terminate on one side of an indicating lamp. Maybe it is there just to confirm that 3-wires are connected but it surely doesn't supply any real power.
I conclude from the above that in effect the Power to welding head (via the contactor) and to the unit's electrics run from just two of the Phases.
If that is the case then my question is....Is the whole arrangement likely to work with just the single phase 230v across the Two wires?
I feel it might since the Table of welding times versus metal thickness etc printed on the unit are shown for "220V" and for "380V".
I appreciate that this must appear as so much gobbledygook, but I'm just hoping someone out there knows exactly what I mean!
Thanks if anyone can help.
Norman
I am new to this subject so am hoping someone can enlighten me.
I have been entrusted by a friend to work out if he can use a very old ARO D12a Spot Welder on a single phase supply. Looking at the unit I am puzzled by several points.
The Name Plate says V380/420 which obviously are 3-phase supply values - yet internally the incoming supply wiring (4 HD wires) seems to route as follows............
Earth wire > Chassis (as expected)
Two wires > terminate directly on two poles of the contactor/relay (and also appear to supply the units electrical bits like the Timer etc).
Remaining wire > seems to terminate on one side of an indicating lamp. Maybe it is there just to confirm that 3-wires are connected but it surely doesn't supply any real power.
I conclude from the above that in effect the Power to welding head (via the contactor) and to the unit's electrics run from just two of the Phases.
If that is the case then my question is....Is the whole arrangement likely to work with just the single phase 230v across the Two wires?
I feel it might since the Table of welding times versus metal thickness etc printed on the unit are shown for "220V" and for "380V".
I appreciate that this must appear as so much gobbledygook, but I'm just hoping someone out there knows exactly what I mean!
Thanks if anyone can help.
Norman
