Troubleshooting & repair, Torch continuity and solenoid test (continued) – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 67
TROUBLESHOOTING & REPAIR
F-30
F-30
PRO-CUT 55
TORCH CONTINUITY AND SOLENOID TEST (continued)
4. If any of the resistance checks are not cor-
rect, the torch assembly may be faulty.
Repair or replace.
5. Carefully apply the 12 VDC supply to the
electrode solenoid. (positive to Pin 2 and
negative to Pin 3). The electrode solenoid
should activate. Listen for the solenoid
action in the torch handle. If the solenoid
does not activate, it may be faulty. Replace.
TABLE F.5 - TORCH ASSEMBLY RESISTANCES
TEST
CIRCUIT(S) BEING
EXPECTED
TEST
POINTS
TESTED
RESISTANCE
CONDITIONS
Pin 7 to Pin 8
Parallel pilot arc
1.5 ohms maximum
None
leads
Pin 7 to Torch
One pilot arc lead to
1.0 ohm maximum
Torch consumables
Nozzle
nozzle
in place
Pin 8 to Torch
One pilot arc lead to
1.0 ohm maximum
Torch consumables
Nozzle
nozzle
in place
Pin 1 to Pin 9
Torch trigger circuit
100K ohms minimum
Torch trigger NOT
pulled (not activated)
Pin 1 to Pin 9
Torch trigger circuit
1.0 ohm maximum
Torch trigger pulled
(activated)
Pin 2 to Pin 3
Electrode Solenoid
45 to 55 ohms
None
Pin 7 to Torch
Pilot and Electrode
1.0 ohm maximum
Torch consumables
Electrode at machine
circuit
in place
end of torch
Pin 8 to Torch
Pilot and Electrode
1.0 ohm maximum
Torch consumables
Electrode at machine
circuit
in place
end of torch
Pin 7 To
Electrical Isolation
Open
Torch
Pin 1
of Circuits
(very high)
Consumables
Pin 2
Removed
Pin 3
Pin 9
Pin 8 To
Electrical Isolation
Open
Torch
Pin 1
of Circuits
(very high)
Consumables
Pin 2
Removed
Pin 3
Pin 9
Pins 1 & 9 to
Electrical Isolation
Open
None
all other pins
of Torch Trigger
(very high)
Circuit
Pins 2 & 3 to
Electrical Isolation
Open
None
all other pins
of Torch Solenoid
(very high)
Circuit