... c).screw feeder: 4kw motor frequency conversion speed adjusting.d).accumulator pre-pressurization: 5Mpae).allowable max. ... feeder: Composed of charger with 4kw frequency conversion speed adjusting motor, taper helix, agitator knife, taper charger ... control cabinet: Composed of electrical control box, frequency conversion speed adjusting controller, ammeter, voltmeter, instruction light, button, voltage ...