BUG-O Systems BGW-5000 - Manual (Page 17)

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3.6.2 Vacuum degree adjustment device
Undo the butterfly bolt, and turn the outside sleeve to adjust the vacuum degree in the flux hopper
.
3.7 Electrical Cabinet & Power Source Storage
The electrical cabinet of the Girth welder is inside the power source
storage, it consists of a main circuit breaker at the left to receive the
local 3 phase input (380V / 3ph/ 60Hz as standard) and distribute
it to the power supply and the step down transformer, which in turn
steps down the voltage to 220VAC single phase to the secondary
circuit breaker.
Single phase 220VAC is required by the master control and all electrical accessories supported by the Girth welder.