An electrocompressor unit is equipped with a three-phase two-stroke rotor drive asynchronous motor, Y1 is powered for co

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An electrocompressor unit is equipped with a three-phase two-stroke rotor drive asynchronous motor, Y1 is powered for cooling while compressed air is released (escapes) into the atmosphere with Y2 until the end of the start of the drive motor. This group is protected by fuses and thermal relay.
At the end of the start, Y1 closes and air is sent into the tank. P1 stops the machine in case of drop or excess pressure in the tank.
• If the pressure in the tank has reached the desired value, P1 cuts off the engine power;
• P2 cuts off the engine power supply when the pressure decreases in the compressor
• S2 shuts down the engine when the temperature value is off.
• P3 stops the engine when the water pressure is insufficient in the circuit of
Drop in temperature
It is requested to propose the diagrams of the power and control circuits.
Calculate the protection of the installation (size equipment).
Propose the neutral speed and justify your choice by giving the advantages of the chosen speed Engine characteristics: 7 Kw; 50 Hz; 380 V; η = 0.85 and cos φ = 0.75