MOSA Weld TS 400 YS, Use And Maintenance Manual

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29/01/18 M40-1 (TS)_EN
ENGLISH
ENGLISH
M
40.1.1
TroubleshooTing
REV
.1-01/18
Problem Possible cause Solution
WELDING
P1 - No welding current but
auxiliary output is OK
1) Potentiometer defect in welding current
control
2) Welding current signal interrupter
3) Current sensor faulty
4) Defect in card
5) Defect in diode bridge
1) Replace potentiometer
2) Check that cables from current sensor to
card are in perfect state
3) Replace current sensor
4) Replace card
5) Replace diode bridge
P2 - There is welding but
non penetration
1) Defective welding arc control potentiome-
ter
2) Defective welding current signal
3) Current sensor faulty
4) Defect in card
5) Defect in diode bridge
1) Replace potentiometer
2) Check the continuity of the welding poten-
tiometer and relative connections
3) Replace current sensor
4) Replace card
5) Replace diode bridge
P3 - Defect in welding, high
and discontinued sparks
1) Defective welding current signal
2) Defect in diode bridge
3) Defect in card
1) Replace current sensor
Check that cables from current sensor to card
are in perfect state
2) Replace diode bridge
3) Replace card
P4 - No welding output and
no auxiliary power output
1) Short circuit in wiring
2) Defective condenser
3) Defective stator
4) Short circuited diode bridge
1) Check the wiring inside the welder for a
short circuit between cables or to ground
2) With engine OFF, discharge the capacitor
box, disconnect the wires to the capacitor box
and measure the capacity value
3) If the condenser box is OK, disconnect all
leads from the stator except for those going
to the condenser box and check the output
from the alternator. If there is no output from
the welding winding and the auxiliary winding,
replace the stator
4) If there is output from all windings recon-
nect the diode bridge and check if there is
welding current. If not the diode bridge is de-
fective, replace