Troubleshooting & repair, Warning – Lincoln Electric IDEALARC R3R-500 User Manual
Page 74
TROUBLESHOOTING & REPAIR
F-40
F-40
IDEALARC R3R
INPUT CONTACTOR (CR1) CLEANING/REPLACEMENT (continued)
FIGURE F.25 – INPUT CONTACTOR CLEANING AND REMOVAL
CLEANING PROCEDURE
1.
Remove the main input supply power to the
machine.
2.
Locate and get access to the input contac-
tor (CR1) in the input box. See Figure F.25.
3.
Remove the input contactor cover plate
using a phillips head screwdriver.
Do not apply input power to
the machine with the input
contactor cover plate re-
moved.
4.
Blow out any dirt or dust in or around the
contacts with a low pressure air stream.
5.
Inspect the contacts for signs of excessive
wear, pitting, or contacts fused (stuck)
together.
a.
If any of these conditions are present,
replace the input contactor assembly.
6.
Replace the input contactor cover plate.
CONTACTOR REPLACEMENT
PROCEDURE
1. Disconnect main input supply power to the
machine.
2. Locate and get access to the input contac-
tor (CR1) in the input box. See Figure F.25.
3. Disconnect the main input supply power
leads L1, L2, and L3 to the input contactor.
Remove the control transformer primary
leads H1, H2 or H3 (dependent on input volt-
age) from L1 and L3 terminals on the input
side of the contactor.
4. Disconnect the output leads T1, T2, and T3
from the input contactor.
5. Identify and label the leads connected to the
input contactor coil. See the Wiring
Diagram.
6. Disconnect the leads from the input contac-
tor coil (leads X1, #232 and #233). See the
Wiring Diagram.
7. Remove the three self-tapping mounting
screws using a 5/16” socket wrench. See
Figure F.25.
8. Remove the input contactor.
9. Insert the replacement input contactor and
install it following the procedures in reverse
order.
NOTE: Be sure to reconnect all leads cor-
rectly.
WARNING
1. INPUT SUPPLY LINE
2. INPUT CONTACTOR CR1
3. RECONNECT PANEL