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TE500 enables to set some control limits on the welding current. The purpose is that of monitoring the
stability of the welding current so to improve a constant welding quality.
The control unit enables to select two different control modes:
Welding current limits
To activate this control mode, set parameter CONTROL MODE to CUR.
Two new parameters will be displayed:
CURR MIN minimum current limit
CURR MAX maximum current limit
These two parameters enable to set the welding current limit-values.
Conduction angle limits
To activate this control mode, set parameter CONTROL MODE on DEG.
Two new parameters will be displayed:
ANGLE MIN minimum conduction angle limit
ANGLE MAX maximum conduction angle limit
These two parameters enable to set the welding current conduction angle limit-values.
When working, if the measured value of the welding current, or its conduction angle, is beyond the set
limits, the welding spot is considered as "out-of-limits".
If consecutive "out-of-limits" welding spots occur, it is possible to stop the welder. The number of the
consecutive "out-of-limits" welding spots after which the control unit blocks, can be adjusted by means
of the BLOCK SPOTS parameter placed in the set-up menu (see the relevant paragraph for the
programming operations). This value can be included between 0 and 15. By setting it to 0, this function
is deactivated, so that the welding process is not blocked in case of "out-of-limits" welding spots.
Bear in mind that in order to be effectively considered and counted, the "out-of-limits" welding
spots must follow each other.
When the set error condition takes place, the control unit locks and the displays show an error
message. The error message refers to the last welding spot. When working with the current control
mode (CONTROL MODE=CUR), if the last welding spot current is either lower or higher than the limits
set in the above stated parameters, the display will show one of the following messages:
When working with conduction angle control mode (CONTROL MODE=DEG), if the last welding spot
conduction angle is either lower or higher than the limits set in the above stated parameters, the display
will show one of the following messages:
WELDING CURRENT AND CONDUCTION ANGLE LIMITS
STOP LIMIT
MINIMUM CURRENT
STOP LIMIT
MAXIMUM CURRENT
STOP LIMIT
MIN. CONDUCTION
STOP LIMIT
MAX. CONDUCTION
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