Chicago Electric 95424 - Manual (Page 20)

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Page 20 SKU 95424, 95629
OpERAtInG InstRUCtIOns
bEfORE yOU bEGIn WELDInG
Good welding requires a high degree of skill and experience. You should practice
a few sample welds on scrap metal before you begin welding your first project. Ad-
ditional practice periods are recommended whenever you weld a different thickness
of material, wire, or weld a different type of connection.
UnDERstAnDInG DUty CyCLE (DURAtIOn Of UsE)
CAUtIOn! Avoid damage to the Welder by not leaving the unit on for more than
the prescribed duty cycle time.
100% Duration of use
at 125 Amp setting
Continuous
use
30% Duration of use
at 250 Amp setting
3 minutes in use
followed by
at least
7 minutes Off
in a single 10 minute period
Other settings fall between these two ranges.
fIGURE H
The duty cycle defines the number of minutes, within a 10 minute period, during
which a given Welder can safely produce a particular welding current. for example,
this Welder, with a 30% duty cycle at 250 Amps must be allowed to rest for at
least 7 minutes after every 3 minutes of continuous weld at 250 Amps. (see
figure H.)
Failure to carefully observe duty cycle limitations can easily over-stress a Welder’s
power generation system, contributing to premature Welder failure.
This Welder is equipped with an internal thermal protection system to help prevent
over stressing the unit. When the unit overheats, it automatically shuts down, then
automatically returns to service when it cools down.
note: Once the unit returns to service, follow a more conservative duty cycle routine to
help prevent excess wear to the Welder. (see figure H.)
1.
2.
3.
4.