CHAPTER 6: USER MAINTENANCE
UB25 LINEAR DC RESISTANCE WELDING CONTROL
6-2
990-665
Hard
The problem is embedded in the system and some form of repair will be needed. For example, repair
might include replacing a broken weld head flexure.
In either case, you may telephone the AMADA WELD TECH Applications Laboratory for assistance
by calling the telephone number listed in the Foreword and asking for the Applications Laboratory.
Alarm Messages
Built-in automatic self-test and self-calibration routines will bring up alarm messages on the display
screens. These messages will usually let you know what action is required of you to correct the reason
for the alarm. For a complete listing of the alarm messages, what they mean, and what to do about them,
please refer to
Appendix E, LCD Display Messages.
Troubleshooting
The following Troubleshooting Chart is a comprehensive listing of system and equipment problems, and
their probable cause.
Troubleshooting Chart
PROBLEM
CAUSE (In Order of Probability)
Air-operated weld head will not close.
Air valve driver cable not connected. (Check that the Power Supply switches
to STANDBY state when footswitch is activated.)
Blown fuse located on the Rear Panel.
(Valve Driver Fuse: 3 A, 125 V, Slow-Blow)
Check that the air supply is properly connected to the weld head.
Electrode Damage
Excessive current/energy set at the Power Supply
Excessive or insufficient weld head force
Wrong electrode tip shape
Misaligned parts
Excessive weld time set at the Power Supply
Contaminated weld piece surface/ plating
Wrong electrode material
Contaminated electrode surface
