The NSW-based company claims the welder offers safety features never before provided for maintenance personnel working on location or in areas difficult to access.
“Minarc 110 and 140 models are high performance inverter based machines running a Single Phase 240V manual metal arc system and weigh just 4.2kg,” Kemmpi said.
“Thus they are suitable for any location work, in workshops, where portability is paramount, and in situations where the power supply source is beyond the control of the welder.”
Welding machines serving this market sector are typically not well protected against voltage surges and other volatile AC input voltages.
Minarc has an over-voltage protection circuit guarding against voltages that rise too high and damage semi-conductors. The limit is about 280V rms, and when exceeded the protection circuit blocks the PWM-controller giving pulses to IGBTs, whereupon the power source goes off state.
If the mains voltage rises further - up to 480V peak value which is about 340V rms - a passive over-voltage circuit is activated and the DC-link voltage is maintained at a safe level.
Minarc 110 and 140 are designed to be generator safe, which to date has been a common weakness in portable welding machines.
While portable welding units are not normally recommended for use with generators, Minarc 140, for instance, requires a 6kVA generator to work properly even with a 50m extension lead from the generator.
If the only generator available was 3.5kVA, Minarc 110 and 140 would still work with 65A output. Primary critical voltage requirements range between 185V - 270V. Anywhere inside this range the Minarc machine performs perfectly.
Minarc 110 and 140 will weld with all known MMA electrode types, including cellulose electrodes (coated ones normally used in carbon steel pipes etc). The Minarc machines are also capable of scratch start DC TIG welding, with the addition of a TTM15V TIG torch.
