Taurus MIG-250TD, Operation Manual, Page: 28 / 32

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1. Inspection Before Overhaul
1.1. Check if the line voltage on the three-phase power supply is within the range
of 340V-420V and, all phases are intact. In case of a single-phase supply,
check if the line voltage is within the range of 200V – 240V
1.2. Check if the power cable as well as the earth wire is firmly connected.
1.3. Check whether the wiring connections are correct and firmly connected.
2. Common Machine Problems and Troubleshooting
No. Problem Root cause What to do
1
Machine is
switched on,
no digital
display, fan not
operational, no
open-circuit
voltage.
Power switch malfunction or
damaged.
Repair or replace switch.
Power phase down.
Check power supply
phases and rectify.
No power supply from the
grid.
Check the power grid.
Filter capacitor and/or
rectifier bridge damaged.
Replace filter capacitor
and/or bridge rectifier.
Transformer damaged. Replace the transformer.
Control board damaged. Replace the control board.
2
Welding
current not
adjustable.
Broken wire feeder control
cable or controller.
Replace wire-feeder control
cable or the controller.
Control board damaged. Replace the control board.
Wire at both ends of the
diverter inside the machine
is broken.
Reconnect or replace the
broken wire.
3
Unstable arc
and excessive
spatter
Welding parameters do not
match or irregular operation.
Readjust parameters or
improve operation.
Badly worn contact tip. Replace contact tip.