7
machine cools and the output current will again be
available.
The CV405-I is also electronically protected against
overloads and accidental short-circuits. The overload
protection circuit automatically reduces the output
current to a safe value when an overload is detected. If
the circuitry senses a short circuit, it will shut off the
CV405-I output current. The short-circuit protection
circuit can be reset by turning the CV405-I power switch.
Remove the short before turning the power switch ON
again.
Maintenance
Procedures for replacing PC Boards
Before replacing a PC board which is suspected of being
defective, visually inspect the PC board in question for
any electrical or mechanical damage to any of its
components and conductors.
1) If there is no visible damage to the PC board, install
a new one and see if this remedies the problem. If
the problem is remedied, reinstall the old PC board
to see if the problem still exists. If it does no longer
exist with the old PC board :
a) Check the PC board harness connector pins for
corrosion, contamination or looseness.
b) Check leads in the plug harness for loose or
intermittent connection.
2) If PC board is visibly damaged electrically, before
possibly subjecting the new PC board to the same
cause of failure, check for possible shorts, opens or
grounds caused by :
a) Frayed or pinched lead insulation.
b) Poor lead termination such as poor contact or a
short to adjacent connection or surface.
c) Shorten or open motor leads.
d) Foreign matter or interference behind the PC
boards.
3) If PC board is visibly damaged mechanically,
inspect for cause, then remedy before installing a
replacement one.
PC Board troubleshooting procedures
Control PC boards
The control PC board controls all machine functions
including the thermal protection indicator light. Most
problems, if not caused by faulty wiring or machine
misuse, will come from a faulty control PC board.
Perform the following diagnostic procedure before
replacing the control PC board :
1) Turn off the input power at the fuse box.
2) Check for loose connections in the PC board plugs
(particularly J3).
3) Disconnect the J3 plug from the control PC board.
Measure the resistance between wires 200 and 201
and between wires 202 and 203. Both resistances
should be less than 1 ohm. If they are not less than
1 ohm, check the wiring back to the main
transformer. If they are less than 1 ohm, refer to
"Procedure for replacing PC boards".
Checking Snubber Circuit
In case of an SCR malfunction or failure, the snubber
assembly should be checked. Disconnect the input
power to the CV405-I at the fuse box and remove the
right side of the machine. Visually inspect the snubber
PC board assembly (located below the control PC
board) for overheated components or damaged
components.
Electromagnetic Compatibility (EMC)
02/02
This machine has been designed in accordance with all relative directives and norms. However, it may still generate
electromagnetic disturbances that can affect other systems like telecommunications (telephone, radio, and television) or
other safety systems. These disturbances can cause safety problems in the affected systems. Read and understand
this section to eliminate or reduce the amount of electromagnetic disturbance generated by this machine.
This machine has been designed to operate in an industrial area. To operate in a domestic area it is
necessary to observe particular precautions to eliminate possible electromagnetic disturbances. The
operator must install and operate this equipment as described in this manual. If any electromagnetic
disturbances are detected the operator must put in place corrective actions to eliminate these disturbances
with, if necessary, assistance from Lincoln Electric.
Before installing the machine, the operator must check the work area for any devices that may malfunction because of
electromagnetic disturbances. Consider the following.
•
Input and output cables, control cables, and telephone cables that are in or adjacent to the work area and the
machine.
•
Radio and/or television transmitters and receivers. Computers or computer controlled equipment.
•
Safety and control equipment for industrial processes. Equipment for calibration and measurement.
•
Personal medical devices like pacemakers and hearing aids.
•
Check the electromagnetic immunity for equipment operating in or near the work area. The operator must be sure
that all equipment in the area is compatible. This may require additional protection measures.
•
The dimensions of the work area to consider will depend on the construction of the area and other activities that are
taking place.
Consider the following guidelines to reduce electromagnetic emissions from the machine.
•
Connect the machine to the input supply according to this manual. If disturbances occur if may be necessary to take
