ESAB MEK 4, Руководство по обслуживанию

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Phase 2
Phase 2 starts when phase 1 finishes. The wire feed unit further reduces the wire
speed to 84% of the value during phase 1. Optocoupler IC10 turns off, giving the
power unit a signal further to reduce the voltage. Phase 2 continues also for a
maximum of 1.27 seconds.
Phases 3 and 4
Phases 3 and 4 are repeats of phases 1 and 2. After phase 4, during which wire feed
speed is 50 % of the original value, welding concludes with the preset burn--back
time.
If, when in 4--stroke control mode, the welding gun trigger switch is released while
crater filling is in progress, crater filling will be interrupted.
Wire feed speed and welding voltage during crater filling