Rato RTAXQ1-190 Owner's Manual page 13

CONTROL
8. Auto Throttle
The solenoid valve will operate and engine keep idele speed when the
switch turn ON and electric welder set is no load.For engine operating,
switch ON the load and solenoid valve disconnect.
9. Oil Alert System
The oil alert system is especially designed to prevent welder from
damaging caused by an insufficient amount of oil in the crankcase.
When the oil level in the crankcase fall down below a safe limit, the
oil alert system will automatically shut down the welder (though the
welder switch still remains in "ON" position), so that the welder can't be
damaged resulting from the insufficient amount of the oil.
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