Lincoln Electric IM669 RED-D-ARC DC-600 - Manual (Page 28)

DC-600 RED-D-ARC
D-1 MAINTENANCE D-1
SAFETY PRECAUTIONS
ELECTRIC SHOCK CAN KILL.
• Only qualified personnel
should perform this mainte-
nance.
• Turn the input power OFF at
the disconnect switch or fuse
box before working on this
equipment.
Do not touch electrically hot parts.
------------------------------------------------------------------------
ROUTINE AND PERIODIC
MAINTENANCE
1. Disconnect input AC power supply lines to the
machine before performing periodic maintenance,
tightening, cleaning, or replacing parts.
Perform the following daily:
1. Check that no combustible materials are in the
welding or cutting area or around the machine.
2. Remove any debris, dust, dirt, or materials that
could block the air flow to the machine for cooling.
3. Inspect the electrode cables for any slits or
punctures in the cable jacket, or any condition that
would affect the proper operation of the machine.
Perform Periodically:
Clean the inside of the machine with low pressure air
stream. Clean the following parts. When using air, be
careful to adequately protect your eyes.
• Main transformer and choke.
• Electrode and work cable connections.
• SCR rectifier bridge and heat sink fins.
• Control board.
• Firing board.
• Fan Assembly.
NOTE: The fan motor has sealed bearings which
require no maintenance.
WARNING
TESTING THE GFCI RECEPTACLE
1. Turn the welder ON. Press the reset button fully.
Plug a lamp or radio into the GFCI (and leave it
plugged in) to verify that the power is ON. If there is
no power, go to Troubleshooting Section.
2. Press the TEST button in order to trip the device.
This should stop the flow of electricity, making the
lamp or radio shut OFF. Note that the REST button
will pop out. If the power stays on, go to
Troubleshooting Section. If the power goes OFF,
the GFCI receptacle is working properly. To restore
power, press the RESET button.
3. Press the TEST button (then RESET button) every
month to assure proper operation.
NOTE:
The GFCI receptacle is in a 115v circuit where the
neutral is floating with respect to ground.
Consequently if a GFCI tester is plugged into the
GFCI receptacle, the tester will show that there is an
“open ground”. The indication of an”open ground” is
normal and the GFCI will function properly in the
event of a ground fault current as the GFCI is
designed to do.