15
Fault Symptoms
Rectification
4. While this
welding
equipment
is operated,
fault indicator
is off, HF
electricity
releasing is
available, and
welding current
output is
unavailable.
1. Possible disconnection of welding torch cable.
2. Possible disconnection of earth cable, or unavailability of
connection of the earth cable and work piece.
3. The connection between positive output terminal or the
gas or electricity output terminal and this welding
equipment is possibly unavailable. Reconnect them if
necessary.
5. While is this
welding
equipment is
operated, the
fault indicator
is off, no
electricity
releasing, and
the arc starting
available.
1. The cable connection between the transformer of arc
starting and power PCB is possibly unavailable. Check
and reconnect it.
2. Possible oxidization of electricity releasing parts occurs.
Or the distance is larger than the maximum distance
available. Remove the oxidization of the electricity
releasing parts and adjust the distance of the electricity
releasing parts to range of 1mm.
3. Possible damage to MMA/TIG switch. Replace them if
necessary.
4. Components of HF arc starting circuit are possibly
damaged. Check and replace them if necessary.
6. While this
welding
equipment is
operated, fault
indicator is on,
and there is no
output.
1. It is possible of over-current protection status. Switch
off the power supply, wait till the fault indicator is off,
and restart this welding equipment.
2. It is possible of over-heating protection status. Wait till
the fault indicator is off, and the welding operation will
be available.
3. Possible fault with Inverter circuit. Disconnect the power
supply plug (VH-07) of transformer of MOS PCB. And
restart this welding equipment.
3.1 If the fault indicator is still on. Turn off the power
supply of this welding equipment. Disconnect the
power supply plug (VH-03) of HF arc starting.
3.1.1 If the fault indicator is on, MOFESTS of top PCB is
possibly defective. Replace it, if necessary.
3.1.2 Possible damage of transformer of center PCB.
Replace it if necessary.
3.2 If the fault indicator is off.
3.2.1 Possible damage of transformer of center PCB.
Replace it if necessary. Measure the inductance
value and Q value. L=0.9-1 .6mH Q>35. If both
of the inductance value and Q value are
comparatively low, replace them.
3.2.2 Possible damage of secondary rectifier of
transformer. Replace it if necessary.
4. Possible damage of feed back circuit. Replace it if
necessary.
