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2. MINl160/ARC 140/160/200/160T/200T
Fault symptom
Power indicator is not lit,
A.
Make sure power switch is close.
fan is not working, no
B.
Make sure the electric wire net connecting to input cable is working
welding output.
alright
A.
Input cable is possibly connected to 380V power, which causes over
voltage protection circuit is starting. Connect input cable to 220V
power, then restart the machine.
B.
Erratic 220V power supply (input cable is too thin and long) or input
Power indicator is lit, fan
cable is connected to electricity network would start overload voltage
doesn't work, no welding
protection circuit. Increase section of input cable or tighten input
output.
contact. Turn off machine for 2-3 min and restart it.
C. Turn on and off power switch continuously would start overload
voltage protection circuit. Tum off machine for 2-3 min and restart it.
D. Cables are loosed between power switch and power source board,
tighten them again.
Erratic welding output
A.
1 K potentiometer is damaged, replace it.
current or out of control
B. Terminal of output is broken circuit or poor connect.
of potentiometer.
A. Check if components are poor connects.
B. Check if connector of output terminal is break circuit and poor
connect.
Fan is working and
C. Check voltage between power source board and MOS board (VH-07)
abnormal indicator is not
is about DC 308V
lit, no welding output.
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.
A. Overload current protection may start, please turn off machine first,
then restart it after abnormal indicator is off.
B.
Overheat protection may start, it will become normal in 2-3min
C. Inverter circuit rnay go wrong. Please disconnect the power supply
plug of the main transformer on MOS board (near fan VH-07), then
restart the machine.
a) If abnormal indicator is still lit, that means some fieldistors on
Fan is working and
abnormal indicator is lit,
b) If abnormal indicator is off:
no welding output.
D.
Maybe feedback circuit is in fault.
Remedy
MOS board are damaged. check and replace it.
1)
Maybe transformer of middle board is damaged, measure
primary inductance value and Q value of main transfonner
by inductance bridge .
2)
Primary value is parallel circuit, L=1.2-2.0mH, 0>40
If inductance value and Q value is low, replace it.
3)
Maybe some of secondary rectifier tube of transformer is
broken, check and replace rectifier tube.
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