Download Compressed Air Manual - Atlas Copco by T Rogert PDF

By T Rogert

Compressed air

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When the time elapses, the compressor stops and does not start again until the pressure has dropped to the minimum value. This is the traditional tried and trusted control method. The disadvantage is that it gives slow regulation. 2:46 Pressure band, min–max, within which the compressor works. "Min" = load, "Max" = off-load. A further development of this traditional system is to replace the pressure switch with an analogue pressure transducer and a fast electronic regulation system. The analogue transducer can, together with the regulation system, sense how quickly the pressure in the system changes.

On the motor plate it can, for example, state 690/400 V. This means the star connection is intended for the higher voltage and the delta connection for the lower. The current, which can also be stated on the plate, shows the lower value for the star connected motor and the higher for the delta connected motor. 1:27 D 30 The mains supply is connected to a three-phase motor’s terminals marked U, V and W. The phase sequence is L1, L2 and L3. This means the motor will rotate clockwise seen from “D” the drive end.

E. mechanical energy. The stator is connected to the mains supply’s three phases. The current in the stator windings give rise to a rotating magnetic force field, which induces currents in the rotor and gives rise to a magnetic field there too. The interaction between the stator’s and the rotor’s magnetic fields creates turning torque, which makes the rotor shaft rotate. 1 Rotation speed If the motor shaft should rotate at the same speed as the magnetic field, the induced current in the rotor would at the same time be zero.

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