TECNA
S.p.A.
ITEM
TE700 Instruction
Manual
45/128
IDENT
At the end of the passage of the welding current and before the execution of
the HOLD TIME, the electrodes penetration into the material (that took place during the
welding operation), is measured. In order to identify the correct penetration values
according to the type of material to be welded, consult the specific welding tables. The
minimum and maximum limits may be set in the measurement carried out.
TH+ID
Both measurements are carried out before and after the welding and the
minimum and maximum limits may be set in both.
ZERO
In this mode the welder switches automatically to NO WELD mode. As such, the
operator may carry out a welding cycle without any material in between the electrodes.
During this cycle the control unit calculates the zero coordinate used as a reference for
the thickness and penetration measurements. The zero procedure is required every
time the machine is turned on, when the welder's secondary geometry changes or
when maintenance is performed to the electrodes.
This control mode may be activated only if the specific position sensor is properly installed on
the spot welder and is activated through the
SETUP MENU
.
QUALITY-R
This parameter allows the operator to select if and which controls are to be carried out on the
electrical qualities of the welded material. The activation of the parameter introduces an initial
weld (into the main welding cycle), with reduced current and time as compared to that set in
the WELDING block, capable of measuring the initial resistance of the material placed in
between the electrodes without altering it from a mechanical point of view. Moreover, a final
weld is introduced having the same time and current values as the initial one so as to
measure the final resistance of the welded material.
OFF
The resistance of the material in between the electrodes is not measured.
PRE
The initial resistance of the material to be welded is measured. The operator may
set the minimum and maximum limits on the measured value.
POST
The final resistance of the material to be welded is measured. The operator may
set the minimum and maximum limits on the measured value.
PRE+POST
Both the initial and the final resistances are measured and the operator
may set the minimum and maximum limits on both measured values.
ZERO
When this mode is selected on the welder, the unit carries out a welding cycle
with reduced current and time as compared to that set in the WELDING block. The
procedure is intended to compensate the resistance of the arms so as to read the
actual resistance of the material in between the electrodes. The zero procedure must
be carried out each time the machine is turned on, when the welder's secondary
geometry changes or when maintenance is performed to the electrodes.
The activation of this control mode depends on the configuration mode of the control unit and
is activated through the
SETUP MENU
.
SQUEEZE 1
The SQUEEZE 1 time determines the time needed by the electrode to move down.
If a simple pneumatic circuit is present, such time represents the interval of time that elapses
from the beginning of the head descent to the welding process beginning. The set value must
be long enough to allow the electrodes to achieve the proper clamping force, before the
welding process begins.
In a pneumatic circuit with low-pressure squeeze, the SQUEEZE 1 time is combined with the
SQUEEZE time where the SQUEEZE 1 time is the one determining the duration of the low
force squeeze, that is to say the interval of time that elapses from the beginning of the head
descent to the application of the welding pressure. The set value must be long enough to
allow the electrodes to reach the work piece to be welded. During the SQUEEZE 1 time, it is
possible to end the cycle by disabling the start cycle signal.
