(Form5) Maintenance form
Faults phenomena
Faults cause/ measures
The current indicator light is off. The
fan does not rotate and the digital
multimeter does not display.
Whether the power switch closed or not
Check whether the input cable and the connecting power
network have electric or not
Check whether the input cable has open circuit point or not
The protection indicator light is on.
Long-time overload situation, thermal protection circuit starts,
decease the welding current and improve the working environment.
Too strong welding current, too long and thin output cable. Decease
the welding current, and shorten the input cable or increase its cross
sectional area.
The output current is not steady or
controlled by the potentiometer, and
the current intensity frequently
changes.
The potentiometer is damaged and shall be changed, the output
cable joint is loosening, and the input three-phase cable line has a
bad contact.
The switch of power cannot be
closed.
IGBT module burns out, and the input three-phase rectifier is
damaged.
The volume of welding current is
nonadjustable.
Current rockwork is damaged or cast off wire, and the main control
board is damaged.
The current indicator light is on and
the fan no rotate
The fan does not work, the input power is normal or not, and the
connecting wire of fan is split or not.
Sodium hydroxide electrode has big
spattering.
The polarity is mistakenly connected, and exchanges the polarities
of grounding line and handing wire.
Note: 1. People other than maintenance personnel of professional electricians of our
company shall not open the shell.
3. Turn off the powers of the welding machine and the distributing box.
