ZERMA GSH 600-800 screen change

The heavy duty granulators of the GSH 600 and 700 series offer a wide array of different rotor designs with widths ranging from 800 mm to 1000 mm with a diameter of 600 and 700 mm. The completely welded heavy steel construction is designed to withstand the most demanding and universal applications. Rotor bearings, knife mounts and rotor shaft are oversized. The standard V-cut creates a high quality regrind with a very low percentage of fines in the output material.
Lumps and purgings
Film waste
Bumpers, door liners and fuel tanks
E-waste
Bottle and bread crates

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What about before this step? What has to be enabled or disabled on the control panel? I fear our control panel is missing a keyed switch. And the Operation Manual isn't that helpful. Help.