Lincoln Electric POWER WAVE C300 Service Manual page 87

F-68
WIRE DRIVE MOTOR TEST PROCEDURE (continued)
PROCEDURE
1. Disconnect the input power to the POWER
WAVE® C300 machine.
2. To gain access to the Wire Drive Motor test
points first perform the Case Cover and DC
Link Capacitor Discharge Procedure.
3. Locate the Wire Drive Motor and Plug P11.
See Figure F.23.
4. Disconnect Plug P11.
have to be removed to gain access to Plug
P11.
5. Using the Ohmmeter check the armature resis-
tance from the black lead to the white lead on
the motor. The normal resistance is approxi-
mately 1.5 ohms. Also check the armature
resistance to the case of the motor.
This resistance should be very high. In the mil-
lions of ohms. If either of these resistance
measurements is not correct the motor may be
defective.
TROUBLESHOOTING AND REPAIR
FIGURE F.23 – WIRE DRIVE MOTOR LOCATION
Some wire ties may
POWER WAVE® C300
6. If the resistance measurements are correct in
Step 5 then using the variable DC Power
Supply apply a low voltage DC (8-10 volts) to
the motor armature leads. White Lead (+) and
Black Lead (-). The motor should run. As the
armature voltage is increased the motor should
increase in speed. If the motor does not func-
tion correctly the wire drive motor may be
defective. Make certain there are no physical
restrictions preventing the motor from running.
7. Reconnect Plug P11 and replace any wire ties
previously removed.
8. Replace the case covers.
F-68
PLUG P11
WIRE DRIVE
MOTOR