Lincoln SA250 problems

By GLorenzen Date 01-27-2005 21:21

Check your brushes and related wires on the exciter (rotor) slip rings, also make sure that your sliprings are clean and in good shape.

By SA-200

Date 02-06-2005 15:19

There is no slip rings or rotor here... You need to check the 2 brushes and commutator on the exciter armature. You should put a dc Volt meter on the 2 brush leads to see if there is voltage there when the machine doesnt weld. Let us know what u find out...

By GLorenzen Date 02-09-2005 20:17

True the SA-200 has a DC exciter. However the SA-250 has an AC exciter that is flashed by the main generator through a blocking diode on the 5:00 brush holder. When the field is built up and power generated in the exciter, power is provided to the aux. outlets and to a fuse protected bridge rectifier located behind the main panel. From that rectifier bridge comes the DC power to sustain the exciter rotor field and to supply the main generator shunt field coils via the rehostat (blue & brown wires).

By supermechanic (**)

Date 02-10-2005 01:03

GLORENZEN, P M me please, You seem to know Lincoln, Ihave some tech questions. Thanks Ed

By SA-200

Date 02-10-2005 13:18

Well it depends if ur sa-250 has 1 or multiple 110v outlets. If it has 1- 110v outlet, its like a sa-200 with 110vdc power with a dc exciter. If it has several 110v outlets, it has a rotor and slip rings with 110vac power.

By GLorenzen Date 02-10-2005 23:53

You are right about that, however only about half a dozen or so old code numbers are applicable to those units. By a overwhelming majority they are of the alternator type. Which makes a good point always provide your code number in any correspondence.