TECNA
S.p.A.
ITEM
TE700 Instruction
Manual
CHAPTER 3 –
SEAM WELD OPERATING MODE
FEATURES TE700
START 1-2NC OFF
BIC 1-2 NC OFF
>SEAM WELD MODE ON
If the seam weld mode is active on setting the mode, the AUTORETAIN function will be
automatically deactivated at the START inputs. If the operator does not accept the
deactivation of the AUTORETAIN function it will not be possible to activate the seam weld
mode.
This function allows the operator to adapt the control unit to the requirements of a seam
welder. Consequently, welding current is supplied either continuously or via parameter COLD
2 in pulse mode.
On keeping the cycle-start command active, the control unit keeps repeating the time set in
the WELD parameter to prevent the control unit from completing a long weld. time on cutting
off the cycle-start command. We suggest using short weld times.
The welding current is measured indifferently through pulse cycle, WELD and COLD T. 2 time
combination, or through continuous cycle, WELD time only.
In the seam weld mode, the EV3 output is used as a roller-start command instead of being
used for the forging.
On enabling the programming of the WELD 2 parameter, the operator may set not only the
CURRENT parameter but also the CURRENT 2 parameter. During the welding operation it is
possible to commutate between one set current value and the other using the WELD 2 input
present on the INVERTER unit. If the COLD T. 2 parameter is other than zero, each time the
two foregoing current values commutate, the COLD T. 2 is carried out. the COLD T. 2
parameter is equal to zero, the passage between two set current values will take place
instantly.
If Rogowsky was set in the
FEATURES INVERTER
menu as current sensor for the
adjustment loop, the continuous weld cannot be carried out but only a pulsed weld with a
COLD T. 2 greater than or equal to 8mS.
If TA was set as current sensor for the adjustment loop, it will be possible to carry out even a
continuous weld with COLD T. 2 equal to zero.
According to the type of current adjustment loop, the available weld modes differ as outlined
in the tables below.
During the welding in the SEAM WELD mode, the value of the welding current and the
conduction percentage of the power semiconductors are displayed in real time on the control
unit. Said information is updated every 0.5 seconds both during the hot times and the cold
times.
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