Grizzly H8155 - Manual (Page 11)

H8155 MIG Welder
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SECTION 4: OPERATIONS
NOTICE
If you have never used this type of machine
or equipment before, WE STRONGLY REC-
OMMEND that you read books, trade maga-
zines, or get formal training before begin-
ning any projects. Regardless of the con-
tent in this section, Grizzly Industrial will
not be held liable for accidents caused by
lack of training.
Operation Safety
Damage to your eyes and lungs could result
from using this machine without proper
protective gear. Always wear safety glasses,
welder's helmet, and a respirator when oper-
ating this welder.
Welder Duty Cycle
As the welder produces the desired power output
for the welding operation, power is converted to
heat. In order to protect the welder components
from over-heating, each welder has an estab-
lished duty cycle, which varies depending on the
amperage output being used.
A duty cycle is the number of minutes out of 10
minutes that the welder can safely operate at the
current amperage output without over-heating.
For instance, the Model H8155 has a duty cycle
of 45% at 50A output. This means that the welder
can operate continuously for 4.5
minutes at 50A
output, then the arc must be stopped to allow the
welder, using the cooling fan, to cool off for at
least 5.5 minutes before starting the arc again.
The Model H8155 has a cooling fan and an inter-
nal thermostat that will shut the welder down if
the duty cycle is exceeded. This will be evident by
the loss of welding circuit and the orange warn-
ing light on the face of the welder will illuminate.
When the welder has cooled sufficiently, the inter-
nal thermostat will re-establish the welding circuit
and the orange warning light will go out.
Always treat the welding components as if
they carry live welding current, even when
the welder reaches the duty cycle limit and
shuts down. When the welder re-establishes
the welding current, the electrode and work
lead will immediately carry live welding cur-
rent. Ignoring this warning could result in
serious personal injury or death.