Upgraded Safety Protection Lid? Open-Cover-Stop type grain grinder will automatically stop working when its lid is opened, largely enhancing use security. There are two induction switches in the buckles on the both sides, which make the mill get started only when the lid is closed completely. So if the grinder cannot turn on the first time, please adjust the lid like steps in image 5. OVERLOAD PROTECTOR? When grain grinder is in an overloaded/overheat state, the overloaded protector will work automatically to stop the operation. It’s easy to solve by replacing the carbon brushes on the both sides and then pressing the overload protector again, then the grinder could work well. High Power & High Speed? Capacity: 700g, Power: 2400W, Speed: 28000r/min, Working Time: no more than 3min. NOTE: Material ground one time must cover the long blade in the middle and NO MORE THAN 2/3 of the tank. 1/2 of the tank is the best. The whole process of high-speed grinding is carried out in the closed tank, which will generate heat. So It is normal for the machine to be slightly heat. Our grinder can only be turned on after the lid is fully buckled. Please follow the steps of How to Close Lid on manual, video or listing image 5; 2. The materials ready for grinding must be DRY enough; 3. Rest the machine for 5-10 minutes after every 3 minutes operation.