Theory of operation, Protection devices and circuits – Lincoln Electric IDEALARC CV-300 User Manual
Page 36
E-3
THEORY OF OPERATION
E-3
IDEALARC CV-300
A thermostat protects the CV-300 from excessive oper-
ating temperatures. Excessive operating temperatures
may be caused by a lack of cooling air or operating the
machine beyond the duty cycle and output rating. If
excessive operating temperature should occur, the
thermostat will open and deactivate the machine’s out-
put. The thermal protection light will light (on earlier
codes the pilot light will flash) and the fan will continue
to run. The thermostat will remain open until the
machine cools, at which time the machine will resume
normal operation. If the fan does not turn or the air
intake louvers are obstructed, then the input power
must be removed and the fan problem or air obstruc-
tion be corrected.
The CV-300 is also protected against high current
overloads. If this electronic protection circuit senses a
current overload the machine’s output will be disabled.
The electronic protection circuit can be reset either by
turning the line switch off for ten seconds or by open-
ing the trigger circuit (leads #2 and #4) for five sec-
onds.
PROTECTION DEVICES AND CIRCUITS