Mac Afric MMA 315G, User Manual

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19
TROUBLESHOOTING AND FAULT FINDING
Notes: The following operations must be performed by qualified electricians with valid certifications.
Before maintenance,please contact with us for professional suggestion.
Fault symptom and solution.
Fault symptom Solution
Meter doesn’t display, fan
doesn’t work, no welding
output.
1. Make sure power switch is off.
2. Make sure the power source connecting to input cable is working
alright.
3. Make sure the input voltage is 3 phase.
Meter is normal, fan is
working, no welding output.
1. Check if all kinds of components of machine are poor contact.
2. Check if connector of output terminal is broken or damaged.
3. Check if the control board is damaged (contact with the supplier
or manufacturer).
Abnormal indicator is on, fan
is working, meter is normal
1. IGBT is damaged.
2. Rectifier of quick recovery is damaged.
3. Control board is broken.
4. The feedback circuit is in fault. Please contact with the supplier or
manufacturer.
Too much spatter during
MMA welding Output terminal polarity connection is wrong. So please change the
polarity.
Erratic welding output
current or out of control of
potentiometer.
1. The potentiometer is damaged.
2. All kinds of connectors are poor contact, especially plugs. Check
them.
Power switch doesn’t work
1. Power switch is broken.
2. Three phase rectifier bridge is broken, replace it.
3. Check if there is any short circuit of inner-machine.
If the welding machine doesn’t work after the above examination and repair, please contact the local
dealer or after-sales service department of our company.