Jasic ARC140 Operator's Manual

Also see for Arc 140: Operating instructions

Contents

Jasic ARC140 Operator's Manual Manual pdf 21 page image

155. TROUBLESHOOTINGTable 5-1: Troubleshooting for ARC200 104(Z )Malfunction Phenomena Cause and SolutionThe power indicator/meterdisplay does not illuminate;the fan does not work; nowelding output.The power indicator/meterdisplay illuminates;the fan does not work;no welding output.The fan works; the outputcurrent is unstable or cannotbe controlled by potentiometerwhen welding.no welding output.The fan works;the abnormity indicatorilluminates;no welding output.The electrode holder becomesvery hot.Excessive spatter in MMAwelding.5. TROUBLESHOOTINGThe fan works; the powerindicator and meter displayare normal;b. The power switch is continuously switched on and off in a short time, which leads toovervoltage protection. Shut down the machine and restart it after 5~10 minutes, andthen it will recover.d. The 24V relay on the power PCB is damaged or not closed. Check the 24V powersupply and the relay. Replace the relay if necessary.a. Make sure that the mains voltage is normal.b. Check if the connecting wires on the control PCB are reliably connected.c. Check if the current adjustment potentiometer is damaged, and replace it if necessary.d. Replace the control module on the top PCB.c. Check if the driving MOSFET Z24/9Z24 for VT7-VT10 on the top PCB is damaged,and replace it if necessary.d. The control circuit fails. Please contact your distributor or JASIC.( )a. The rated current of the electrode holder is smaller than its actual working current.Replace it with a bigger rated current.b. Check if the screw or wire of the electrode holder is reliably connected.The output polarity connection is incorrect. Exchange the polarity.e. Power it on, and switch the digital multimeter to DC 1000V. Check if there is 310V DC at bothterminals of the DC bus CON4 on the top PCB. If there is, replace the top PCB. Otherwise,replace the bottom PCB.a. Make sure that the mains voltage is normal.b. Make sure that the input cable is reliably connected to the power switch, and that thepower switch can be switched on or off normally.c. Check whether any of the silicon bridge, MOS tube or rectifier diode are damaged,and whether the gate resistor is burned out. Replace them if necessary.d. Check whether the connecting wires on PCBs are reliably connected.a. The 220V input power is unstable (the input cable is too thin and too long), which leadsto overvoltage protection. Replace the input cable with a larger diameter and tighten thejoint. Shut down the machine and restart it after 5~10 minutes, and then it will recover.c. The wire connecting the power switch with the power PCB breaks is loosely connected. Tighten it.a. Open circuit or poor contact problems exit at the joints of output terminals.b. There is about DC 310V from the power PCB to CON4 (VH-07) on the top PCB. Checkif the silicon bridge breaks or is not well connected. 2) Check if any of the 5 big electrolyticcapacitors (470uF/400V) have leakage problem, and replace them if necessary.b. Overheating protection occurs. It will recover automatically after 5~10 minutes.d. The feedback circuit (wire) fails.c. The inverter circuit fails. Pull out the power supply socket (near the fan VH-07) forthe main transformer on the top PCB, and restart the machine.1) If the abnormity indicator still illuminates, some of the MOSFETs on the top PCBis damaged. Replace it if necessary.Some of the secondary rectifier diodes of the transformer may be damaged. Replaceit if necessary.2) If the abnormity indicator does not illuminate:The transformer on the center PCB may be damaged. Check the inductance andQ value of the primary of the main transformer. The primary of the transformer isparalleled. For a single main transformer, L=1.5~2.4mH, Q>40. Replace the maintransformer when the inductance and Q value is small.a. Overcurrent protection occurs. Shut down the machine, and restart it after theabnormity indicator does not illuminate, and then it will recover .

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