- Synchronous drive, single or three phase, for silicon controlled rectifiers with phase cut off current regulation or via field bus.
- Regulation speed within 2 cycles for the first welding spot and then within 1 cycle.
- Automatic line frequency recognition, 50/60 Hz, with periodic control of synchronism.
- Four independent auto calibrations of machine’s secondary circuits or with manual setting.
- User selectable current measurement on primary or on secondary with possible reading of both.
- The current loop gain is user adjustable.
- Six different modes of current regulation are available:

• Duty fixed pro thousand D‰
• Duty pro thousand with compensation of power line voltage fluctuation, V‰
• Constant Current IK
• Constant Power PK
• Constant Energy EK
• Adaptive AD

- The weld current can be set by external voltage reference 0-10V or via field bus.
- User selectable set, management and parametrization of the cycle for spot weld machines or for seam weld machines and spot weld machines and for seam weld machines .
- Time management in periods or in half cycle.
- Galvanic insulation of input and output sections.
- Setup and run of 128 (256*) programs, callable by external input, internal, sequential or associated with the start cycle IC1 or IC2 and via field bus if installed.
- Communication line USB or Ethernet* for the connection to Personal computer or TFT terminal.
- Communication expansion Field Bus*: Profibus -Profinet I/O -Device Net -CANopen -Modbus/ RTU -Modbus/TCP -EtherNet/IP -EtherCat.
- Start cycle with concomitance: (dual pushbutton inputs) or pedals.
- Monitoring (for quality control) of the limits of the welding current in spot-weld and in seam weld mode.
- Programmable function of continuous self-increase or decrease of the weld current to compensate the electrodes wear under variable curve for up to four pairs of electrodes
(four transformers) or for tungsten electrodes (Decrease); (Auto-Step).
- DRESS Electrodes counter with signaling and reset suitable for four electrodes pair.
- Weld counter up to 999999, with alarm and lock function.
- Four solenoid valves flexibly associated to pre-squeeze and squeeze.
- Proportional valve drive circuit, galvanic insulated, with % setting Pressure(bar) or Force(dN), voltage output or 4 ÷ 20 mA.
- Proportional valve full-scale setting (99%) from five to 10V.
- Forging solenoid valve output.
- Output for pre-stroke solenoid valve with pre-stroke function.
- Association of pressure in Pre-squeeze, Squeeze, Preheat, Welding, Forging and Rest, by mean of the proportional valve (pressure cycle) in %, Pressure(bar), Force(dN).
- Possibility of external power supply 24 V. DC to support the field bus activities in case of power line failure.
- Transformer power diodes temperature monitoring.
- Cool water Flow monitoring.
- Automatic check with eventual error signaling for open Rogowski coil
- Check and possible signaling of weld start while the electrodes are still opened.
- Resistance check (Test) for:

• Opened electrodes.
• Closed electrodes (wait for resistance of start).
• Pre-heat resistance.
• Weld resistance 1.
• Weld resistance 2.
• Post heat resistance.
• Final resistance of weld spot.

- Management, via CAN BUS of four wait inlets and of four additional drive outlet, before the pre-squeeze time and after the hold time*.
- Concatenated programs run.
- Graphic plot on the terminal of the weld magnitudes.
- Test functions of inlets and outlets.
- Error and weld log windows with time date and weld number records, stored in baked up memory.
- Automatic duplication of weld program in more additional programs.
- Management via CAN BUS of the linear displacement of the electrodes with or without wear recovery. Pressure or force management by mean
of proportional valve or load cell with feedback.*
- Enable or disable, by mean of flags, of the display and use of the weld cycle parameters.
- In seam weld mode: set of start, slope, end slope currents
- In seam weld mode: three remote or via fieldbus recallable currents*.
- In seam weld mode: independent check function for each current.
- In seam weld mode: independent management of each current, of the weld pressure in %, Pressure(bar) or Force(dN)
- In seam weld mode: Management of four rotation speeds.
- A special cycle for the weld of lead/acid batteries is available.
- Possibility of choice among five languages on the programming unit display. Additional languages upon request.