Troubleshooting & repair, Air/gas solenoid test (continued), Test procedure – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 70
TROUBLESHOOTING & REPAIR
F-33
F-33
PRO-CUT 55
AIR/GAS SOLENOID TEST (continued)
TEST PROCEDURE
1. Remove input power to the machine.
2. Perform the Input Capacitor Discharge
Procedure detailed earlier in this section.
3. Locate the air solenoid and leads. See Figure
F.6.
4. Carefully remove plug J31 from the output
power board. See Figure F.7.
5. Check the coil resistance of the solenoid at
plug J31 pin-6 to J31 pin-5. Normal resis-
tance is approximately 20 ohms. If the resis-
tance is abnormal, check the continuity (zero
or very low resistance) of leads #366 and
#361 between the solenoid and plug J31.
See the Wiring Diagram. If the leads are
good, the solenoid coil may be faulty.
6. Carefully apply the 12 VDC supply to the
solenoid leads at plug J31 (positive to J31
pin-6 lead #366 and negative to J31 pin-5
lead #361).
With proper air pressure applied, the sole-
noid should activate and air should flow.
If the solenoid activates but air does not
flow, check for a restriction in the air line.
7. Install plug J31 back into the output power
board.
FIGURE F.6 – AIR SOLENOID
AIR SOLENOID
G3326 - [ ] PRO-CUT 55 OUTPIUT
x40
J33
X4
(B11)
X2
(B12)
R5
Test
Point
B21
J32
x20
J31
B1
B2
R5
FIGURE F.7 – PLUG J31 LOCATION