Lincoln Electric COMMANDER 400 SVM133-B Service Manual page 125

F-71
TEST PROCEDURE
14. Connect the test leads J50 and J51 to the stator
winding under test. Close S1 and read the volt-
ages at V1 and V2, then open S1 IMMEDIATELY.
Damage can occur to the stator winding under
test if S1 is left in the "on" position for too long.
CAUTION: The 1 ohm resistor will also become
hot very quickly and can burn to the touch.
Leaving the circuit on for too long can also cause
the winding to heat up causing errors in mea-
surements.
Stator Winding Under Test
W1 - W2
W3 - W4
W5 - W6
T1 - T2
T2 - T3
T3 -T1
E1 - E2 (J2 Plug)
NOTE: The resistances in the above table are to be
measured with the windings at an approxi-
mate temperature of 25 degrees Celsius
(room temp.). Measuring after the windings
are heated up can cause errors in the above
table.
17. If any of the continuity checks fail in steps 7 thru
16, then the stator is bad. Replace.
TROUBLESHOOTING AND REPAIR
STATOR RESISTANCE TEST (continued)
Table F.3
COMMANDER 400
15. Use the following equation to determine the
winding resistance:
V2/V1 = winding resistance in ohms.
16. Disconnect J50 and J51 from the stator winding
under test. Check the resistance of all the stator
windings by repeating steps 13 & 14 and using
Table F.3 below.
Resistance
.009 ohms +/- 20%
.009 ohms +/- 20%
.009 ohms +/- 20%
.130 ohms +/- 20%
.130 ohms +/- 20%
.130 ohms +/- 20%
.170 ohms +/- 20%
18. If the test is complete, reconnect the 3 bolted
connections for the T1, T2, & T3 leads from the
stator and exciter module, and capacitor leads.
Make sure that the T1, T2, & T3 stator leads are
matched to the T1, T2, & T3 leads from the
exciter module respectively.
leads will cause the "---" or "CRS" to be stuck on
the display at power up, and no weld output.
Cover each bolted connection with sleeving after
reconnection. Replace Plug J2. Reinstall the left
side engine and stator cover panels and the front
shroud per the "Case Cover Removal" section.
F-71
Mismatching the