P.I.T. PMI140-C, Руководство по эксплуатации

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Inverter Welding Machine
7
Trouble shooting and fault fi nding
Notes: The following operations must be performed by quali fi ed electricians with valid certi fi ca-
tions. Before maintenance,please contact with us for professional suggestion.
Fault symptom Remedy
Power indicator is not lit, fan is not working, no
welding output.
A. Make sure power switch is close.
B. Make sure the electric wire net connecting to
input cable is working alright
C. Heat-sense resistance(4 pieces) is broken.
(24V relay has problem)
D. Power source board(Bottom board has prob-
lem, no DC310V output voltage):
Silicon bridge circuit is broken, cable is loos-
en.
Part of board is burnt.
Check cable between air switch and the pow-
er source board, power board between MOS
board.
E: Subsidiary power source on the control
board has problem. (Contact with dealer or
manufacturer.)
Fan is working and abnormal indicator is lit, no
welding output.
A. Check if components are poor connects.
B. Check if connector of output terminal is
break circuit and poor connect.
C. Inverter circuit may go wrong;
Please disconnect the power supply plug of the
main transformer on MOS board (near fan VH-
07),then restart the machine.
1) If abnormal indicator is still lit, that means
some fi eldistors on MOS board are damaged.
check and replace it.
2) If abnormal indicator is o :
a. Maybe transformer of middle board- is
damaged, measure primary inductance vol-
ume and Q volume of main transformer by
inductance bridge.
Primary value is parallel circuit, L=1.2-
2.0mH, Q>40
If inductance value and Q value is low, re-
place it.
b. Maybe some of secondary recti fi er tube of
transformer is broken, check an d replace
recti
fi er tube.
D. Maybe feedback circuit is open.