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A Continental European receptacle (220V Schuko
type) is located on the rear panel for supplying
220VAC to a water cooler. A 2 amp circuit breaker
which is also located on the rear panel protects this
circuit from excessive overloads or short circuits.
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The power source is thermostatically protected with
proximity thermostats against overload or insufficient
cooling. One thermostat is located on the nose of the
center bottom primary coil and a second thermostat is
attached to the lead connecting the secondaries. Both
thermostats are connected in series with 2-4 circuit. If
the machine is overloaded, the primary thermostat will
open, the output will be zero, the amber thermal pro-
tection light will be on and the fan will continue to run.
The secondary thermostat will open either with an
excessive overload or insufficient cooling. The output
will be zero, the amber protection light will be on and
the fan will continue to run. When the thermostats
reset the protection light will be off.
The power source is also protected against overloads
on the SCR bridge assembly through the solid state
fault protection circuit. This circuit senses an overload
on the power source and limits the output to approxi-
mately 550 amps by phasing back the SCR’s.
Protection is provided to protect the circuitry from
accidental grounds. If leads 75, 76, or 77 are acciden-
tally “grounded” to the positive output lead, the output
will be reduced to a low value, thus preventing any
damage to the machine. If the ground occurs between
75, 76, 77 and the negative output lead, one of the PC
board electronic “self-restoring” fuses will blow, pre-
venting any machine damage. After the ground is
cleared, the fuses automatically reset within a few
seconds.
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• Have an electrician install and service
this equipment.
• Turn the input power off at the fuse
box before working on equipment.
• Do not touch electrically hot parts.
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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. Blow out
the machine at regular intervals.
3. In extremely dusty locations, dirt may accumulate
on the remote control terminal strip. Wipe or blow
this terminal strip off at regular intervals. This is
particularly important in damp locations.