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D-1
MAINTENANCE
D-1
SAFETY PRECAUTIONS
GENERAL MAINTENANCE
1. The fan motor has sealed bearings which require
no service.
2. In extremely dusty locations, dirt may clog the air
channels causing the welder to run hot with prema-
ture tripping of thermal protection. Blow out the
welder with low pressure air at regular intervals to
eliminate excessive dirt and dust build-up on inter-
nal parts.
MACHINE AND CIRCUIT PROTECTION
The CV-300 Control PC Board has built-in diagnostic
routines to alert the operator when trouble exists.
When a trouble condition occurs, the CV-300 meter
will display an error code, in the form "EXX", where
"XX" refers to a specific error. See TROU-
BLESHOOTING section for an explanation of the error
codes.
The power source is thermostatically protected
against overload or insufficient cooling. If the machine
is overloaded, the thermostat will open, thermal pro-
tection indicator light will turn on, and the output will
be zero. The fan will continue to run and auxiliary
power will still be available. The thermostat will
remain open until the machine cools, at which time it
will close and the output will again be available.
The CV-300 is electronically protected against over-
loads and accidental short circuits. The overload pro-
tection 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 CV-
300 output. The short circuit protection circuit can be
reset by turning the CV-300 Power switch OFF for at
least 10 seconds. Remove the short before turning
the Power switch ON again.
CV-300
ELECTRIC SHOCK can kill.
• Only qualified personnel should
perform this maintenance.
• Turn the input power OFF at the
disconnect switch or fuse box
before working on this
equipment.
• Do not touch electrically hot
parts.
WARNING