| 摘要 |
<p>The vapour lamp circuit has three wires (P1, P2, P3) of which one is a common wire. A neutral wire (N) is also provided, and means for generation of a constant voltage reserve. The generator consists of a controller in series with the common wire, so that it always carries a voltage higher than normal voltagE. This reserve is smaller than or equal to 50V. The generator has contacts or brushes which may be controlled by a servomotor. It includes also a winding with output terminals for high load and for low load and with two contact members. The latter are time controlled by a timing relay or by a programming unit.</p> |
