Control unit for skylight motor, comprises a microprocessor, thyristor or transistor type switching, a phase sequence detector, mechanically driven limit switches and an asynchronous three phase motor
摘要
<p>The skylight (1) is located in the roof (2) of a greenhouse and has a hinged window (3) which is driven by an electric motor. The motor has a shaft (6) and pinion (7) which engages with a curved rack (8) to raise/lower the window. Electronic switches control the motor to directions by a microprocessor which receives phase sequence information from a phase detector and end of travel information from limit switches</p>
