MOSA Weld TS 400 YS, Use And Maintenance Manual

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29/01/18 M40-1 (TS)_EN
ENGLISH
ENGLISH
M
40.1.2
TroubleshooTing
REV
.1-01/18
Problem Possible cause Solution
GENERATION
P1 - Absence of output
voltage
1) Main switch in OFF position
2) Differential protection device tripped
(Differential switch, differential relay)
3) Protection tripped due to overload
4) Defective electric protections
5) Defective condenser
6)Alternator defective
1) Check and switch ON
2) Check on the entire installation: cables,
connections, utilities connected have no de-
fective sheathing which may cause incorrect
currents to ground
3) Check the load and diminish
4) Replace
5) With engine OFF, discharge the capacitor
box, disconnect the wires to the capacitor box
and measure the capacity value
6) 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 Ask for intervention of Ser-
vice Department
P2 - No-load voltage too low
or too high
1) Incorrect motor running speed
2) Defective condenser
3) Alternator defective
1) Regulate speed to its nominal no-load
value
2) See previous point P1
3) See previous point P1
P3 - Corrected no-load
voltage too low with load
1) Incorrect motor running speed due to
overload
2) Load with cos φ less than 0.8
3) Defective condenser
4) Alternator defective
1) Check the load connected and diminish
2) Reduce or rephase load
3) See previous point P1
4) See previous point P1
P4 - Unstable tension 1) Contatti incerti
2) Irregolarità di rotazione del motore
3) Defective condenser
4) Alternator defective
1) Check electrical connections and tighten
2) Ask for intervention of Service Department
3) See previous point P1
4) See previous point P1