CHAPTER 6: USER MAINTENANCE
UB25 LINEAR DC RESISTANCE WELDING CONTROL
6-4
990-665
Troubleshooting Chart
PROBLEM
CAUSE (In Order of Probability)
LCD Display is blank, fans are still
operational.
Blown fuse located on internal Bias Power Supply. Contact AMADA WELD
TECH for support.
LCD is operational, the Power Supply
will attempt to fire, but no energy is
provided to the weld and the graphs in the
RUN
screen will not fill in.
Possible open circuit in the secondary circuit. Electrodes did not close
properly.
Possible blown fuse located on internal Capacitor Charging Power Supply.
Contact AMADA WELD TECH for support.
Metal Expulsion
Excessive current/energy set at the Power Supply
Insufficient weld head force
Misaligned parts
Slow weld head follow-up
Incompatible weld piece projection design
Contaminated weld piece surface/ plating
Incompatible weld piece materials
Contaminated electrode surface.
Wrong electrode tip shape
No cover gas on weld piece
Excessive weld time set at the Power Supply
Misaligned parts
Weld Piece Discoloration
Excessive weld time set at the Power Supply
No cover gas on weld piece
Excessive current/energy set at the Power Supply
Insufficient weld head force
Contaminated weld piece surface/ plating
Wrong electrode material/tip shape
Contaminated electrode surface
Weld Piece Over-heating
Excessive weld time set at the Power Supply
Excessive current/energy set at the Power Supply
Misaligned parts
Insufficient weld head force
Incompatible weld piece materials
Wrong electrode material/tip shape
Contaminated electrode surface
