Troubleshooting and repair, Retest after repair – Lincoln Electric INVERTEC SVM158-A User Manual
Page 146
TROUBLESHOOTING AND REPAIR
RETEST AFTER REPAIR
F-96
F-96
V350-PRO
Required Action
Expected Results
Rt. display
Lft.display
Test
Steps
46
47
48
dcon
GAS
GAS
14-pIn roCP
On
OFF
This will only appear if a potentiometer is still connect-
ed to the 14-pin amphenol connector. If this message
appears, disconnect the potentiometer from the 14-pin
amphenol connector.
Test steps 21-24 verify the functionality of the gas sole-
noid. If an oscilloscope is available, verify that the cur-
rent flowing through the gas solenoid is zero before the
solenoid is energized, increases to approximately
700mA (pull in current), remains at 700 mA for approxi-
mately 150 msec, and decreases to approximately
200mA (hold current). Press the local/remote pushbut-
ton to turn the gas solenoid on.
< - 150msec - >
700mA
200mA
0mA- - - - +
Or, the signal can be verified by measuring 12.3 VDC
+/- .5V from lead 553A to 554A (Lead 553A should be
positive)
Press the local/remote pushbutton again to turn the gas
solenoid off.
+------------------------+
+-----....------+
+-------------
After completing all of the above tests, the following will appear on the display.
PASS
DIAg
Verify this message appears for approximately 3 sec-
onds