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OPERATORS’ MANUAL · TIG SERIES R160A SC-A5
16
Malfunction Phenomena Cause and Solution
Turn on the machine, the
protection LED is on, and
there is no welding output.
1. Overcurrent protection: Shut down the machine, and restart it when the
protection LED is off.
2. Overheating protection: Wait for 2~3 minutes without shutting down the
machine, and it will recover automatically.
3. The inverter or arc ignition board fails. For double-inverter machine, pull
out the power supply plug (near -07 of the panel) of one inverter, and
restart the machine. If the protection LED is off, it indicates that this
inverter fails. Otherwise, the other inverter fails. Follow the below steps to
eliminate this problem for both single-inverter machine and
double-inverter machine.
1) If the protection LED is still on, shut down the machine, pull out the
power supply plug (near VH-03 of the fan) of the arc ignition power
supply, and restart the machine.
A. If the protection LED is still on, check if some of the MOSFET
on the MOS board are damaged, and replace them if
necessary.
B. If the protection LED is off, check the arc ignition board and
transformer booster for damage, and replace the transformer
booster if necessary.
2) Connect the power supply of the failed inverter, and restart the
machine with the power cord of the main transformer unconnected.
A. If the protection LED is off, check if the transformer on the
center PCB is damaged, and replace it if necessary.
B. Check if some rectifier diode on the center PCB is damaged,
and replace it if necessary
4. The feedback circuit opens.
The output current is not
high enough and cannot be
controlled by potentiometer
when welding.
1. The secondary cable is overly long or thin. Shorten the secondary cable
or replace with one of bigger cross section.
2. Check if the machine is in remote control mode.
3. Check if the current potentiometer is damaged.