Lincoln Electric LN-25 PRO DUAL POWER Service Manual page 66

F-16
CONTROL BOX
ASSEMBLY
PROCEDURE
1. Remove power from the LN-25™ PRO DUAL
POWER wire drive unit.
2. Perform Case Cover And Control Box
Removal Procedure.
3. Using a 5/16" nutdriver remove the four screws
securing the control box cover. Locate the two
motor leads and 3 tach leads. See Wiring
Diagram.
4. Apply the correct input voltage (15-110VDC) to
the unit.
5. With the trigger activated and the motor run-
ning, check the motor armature current.
Normal armature current is less then 3 amps.
TROUBLESHOOTING AND REPAIR
MOTOR OVERLOAD TEST (continued)
FIGURE F.4 – CONTROL BOX ASSEMBLY
LN-25™ PRO DUAL POWER
6. If the amperage exceeds 3.2 amps for more
than 8 seconds the motor will be disabled.
7. If the motor armature current is normal and the
motor still shuts down, the control board may be
faulty.
8. If the current is high, check for restrictions in the
feed system. They can be caused by a clogged
liner, spindle tightness, drive rolls to tight, fault
drive motor or a faulty gearbox.
9. After testing, replace faulty parts and reassem-
ble the feeder in reverse order of disassembly.
F-16
CASE COVER