tecn@
WELDERS ITEM 8201N ÷ 8214N
EDITION: MAY 2008 PAGE 7 OF 32
2.7 MAIN WELDER FEATURES
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Cylinder with chrome plated stem for heavy duty works and long life; adjustable anti-rotation
device.
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Lubrication free pneumatic components.
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Electrodes descent without pressure for set up and service.
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Built-in compressed air filter unit and tank.
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Silencers for compressed air discharge.
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Two stage electric foot control for clamping and welding pieces only if correctly positioned.
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Pre-setting for additional double stage electric foot connection for the direct recalling of
welding program no.2.
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Water-cooled transformer, plates, electrode-holders and electrodes; transformer with epoxy
resin coated windings.
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Synchronous SCR contactor insulated from cooling water circuit with protection thermostat.
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Two-hand safety control with timer for maximum safety, and removable key selector, standard
on all models.
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Emergency push-button to stop the machine immediately.
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Constant current control unit.
OPTIONS:
8230 - Valve to stop the flow of the water-cooling when the machine is off and flow switch, which
makes the welder stop if the cooling water does not circulate.
8232 - Rotary selector for recalling the welding programs.
8234 - Double stroke control device with pneumatic foot instead of key one. To be used only for
spot welding when the work necessarily requires it.
8235 - Cylinder 1242 daN (
∅
125 double stage) total stroke 100 mm.
8236 - Adjustable double stroke for cylinder 736 daN.
8237 - Adjustable double stroke for cylinder 1242 daN (option 8235).
8238 - Low pressure squeeze for cylinder 736 daN.
8239 - Low pressure squeeze for cylinder 1242 daN (option 8235).
8240 - Proportional valve. Allows to adjust the working pressure directly from the control unit and
to combine a proper pressure value to each program.
8241 - Constant energy operating mode.
2.8 WELDING CONTROL TE550 DESCRIPTION
The TE550 is a microprocessor-based welding control unit for resistance welders. The task of the
welding control unit is to manage the welder components, in particular the controlled diodes that
carry out the welding current adjustment.
The TE550 is a particularly versatile welding control unit as it may be adjusted to different types
of welders; it may be installed not only on spot and projection welders but on seam welders too. It
may work with power adjustment: both in constant current and in constant energy (optional). The
number of inputs and outputs may be increased so to better adjust the welding control unit to
automatic machines.
It is possible to store up to 250 different welding programs, 31 of which are recalled directly from
an external device. Each program comprises several programmable parameters that describe the
work cycle. In addition to the plain 4-stage welding cycle, the control unit allows the running of
welding processes with pre-welding current, post-welding current, slope and pulses.
