12. CAUTION
Check whether:
-- The power source is connected with earth cable
-- All the connections are available. Particular attention should be drawn to the connection
between the earth clamp and workpiece
-- The output terminal of electrode holder and earth cable is not short-circuited;
-- The polarity of output terminals is correct
12.1 Working Environment
A. Welding should be carried out in a relatively dry environment with a humidity of 90%
or less.
B. The temperature of the working environment should be within -10C to 40C.
C. Avoid welding in the open air unless sheltered from sunlight and rain, and never let
rain or water go into the machine.
D. Avoid welding in a dusty area or environment with corrosive chemical gas.
E. Avoid gas shielded arc welding in an environment with strong airflow.
12.2 Good Ventilation
This welding machine has such a great welding current when working that natural
ventilation may not meet the cooling demand, while the inner fan enables the machine to
work steadily by its effective cooling. Operator should make sure the louvres are
uncovered and unblocked. The minimum distance between the machine and nearby
objects should be 30cm. Good ventilation is of critical importance to the typical
performance and service life of the machine.
12.3 Over-voltage is forbidden
The power supply voltage has been shown in the main parameter table. Generally
speaking, the voltage in the welding machine will automatically compensate the circuit to
ensure the welding current is in the acceptable range. If the voltage exceeds the
acceptable limit, you will damage the device. The users should understand this situation
and take the corresponding measures. So, pay attention to voltages changes. Once over-
voltage occurs, stop welding and switch off the power.
12.4 Over-load is forbidden
The users should check the max permitted load current at any time (relatively the fixed
duty cycle). The welding current cannot exceed the max allowed load current. Over-
loading the current will cut the welding machine use life remarkably and maybe burn the
welding machine.
12.5 Over-heating Protection
Over-heating protection appears while the machine is overloaded because of continuous
welding for a long time, and a sudden halt of welding occurs. In this case, it is unnecessary
to restart the machine but just wait for the over-heating LED to go out, and welding can be
recovered.
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