2. MINl160/ARC 140/160/200/160T/200T
Fault symptom
Power indicator is not lit,
fan is not working, no
welding output.
Power indicator is lit, fan
doesn't work, no welding
output.
Erratic welding output
current or out of control
of potentiometer.
Fan is working and
abnormal indicator is not
lit, no welding output.
Fan is working and
abnormal indicator is lit,
no welding output.
Remedy
A. Make sure power switch is close.
B. Make sure the electric wire net connecting to input cable is working
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
cable is connected to electricity network would start overload voltage
protection circuit. Increase section of input cable or tighten input
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.
A. 1 K potentiometer is damaged, replace it.
B. Terminal of output is broken circuit or poor connect.
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.
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
MOS board are damaged. check and replace it.
b) If abnormal indicator is off:
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.
D. Maybe feedback circuit is in fault.
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Summary of Contents for POWER TOOLS MAG-140A
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Page 20: ...MAG MMA140 LISTA DE PE AS 19...
Page 21: ...MANUAL DEL UT LIZADOR MAG 140A 20...
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Page 40: ...MAG MMA140 LISTA DE PIEZAS 39...
Page 41: ...OWNER S MANUAL MAG 140A 40...
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Page 60: ...MAG MMA140 SPARE PARTS LIST 59...
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