... to avoid drop of the panel.B,Vacuum system(1) Maximum vacuum is less than 100Pa, It takes ... Pressure of the air sac of the upper chamber is adjustable in 0~1 pressure atmosphere(5) ... Lower chamber exhaust can be separate in 3 section. Upper chamber Air inflation speed is ... Electrical or air pressure over load, Air supply, Vacuum, Oil level,Over heat, shot circuit, pressure etc ...