OWNER’S MANUAL
- 9 -
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.
Mini 160 fault symptom and solutions:
Fault symptom
Solutions
Indicator of power switch is not
lit, fan is not working and there
is not welding output.
A.
Make sure power switch is close.
B.
Make sure electrify wire net (which is connected to input cable) is in work.
Power indicator is lit, fan does
not work and there is no welding
output.
A.
Maybe be connected wrong to 380V power cause machine is in protection
circuit, connect to 220V power and restart the machine.
B.
220V power is not stabilizing (input cable is too slender) or input cable is
connected to electrify wire net cause machine is in protection circuit. Increase
the section of input cable and tighten input connector firmly. Close machine 2-3
minutes then restart it.
C.
Open and close power switch continuously cause protection circuit is working.
Close machine and restart it after 2-3 minutes.
D.
Cables are relaxed between power switch and power source board, tighten
them again.
Fan is working, welding current
is not stabilizing or out of
potential control, current is
sometimes low and sometimes
high.
A.
Quality of 1K potential is bad, replace it.
B.
Terminal of output is broken circuit or poor connect.
Fan is working and abnormal
indicator is not lit, there is no
welding output.
A.
Check if components are poor connects.
B.
Check if connector of output terminal is break circuit and poor connect.
C.
Check voltage between power source board and MOS board (VH-07) is about
DC 308v.
D.
If green indicator is not lit in assistant power of MOS board, please connect with
seller or our company and replace it.
E.
If there is some question in control circuit, please connect with seller or our
company and replace it.
Fan is working and abnormal
indicator is lit, but there is no
welding output.
B.
Maybe over-current protection is working, please close machine and waiting.
Restart it after abnormal indicator is off.
C.
Maybe overheated protection is working, wait for 2-3 minutes.
D.
Maybe inverter circuit is in fault; please pull up the power plug of main
transformer (near VH-07 fan), which is on MOS board, then restart the machine.
(1) If abnormal indicator is still lit, some of MOS board is damaged, check and
replace it.
(2) If abnormal indicator is not lit:
i.
Maybe transformer of middle board is damaged, measure primary
inductance volume and Q value of main transformer by inductance
bridge.
ii.
Primary value is parallel circuit, L=1.2-2.0Mh, Q>40, If inductance
value and Q value is low, replace it.
iii.
Maybe some of secondary rectifier tube of transformer is broken, check
and replace rectifier tube.
E.
Maybe feedback circuit is in fault.