| 摘要 |
<p>Door drive consists of electro engine and gearing, with emergency drive device which can be connected to it using an emergency current device. Emergency drive device consists of extra-low voltage engine, coupling and switch device to switch off the electro-engine intended for normal drive and to connect and switch on the extra-low voltage engine. In addition, the extra-low voltage engine has gearing to create a rotational speed slower than normal. An emergency current accumulator is present which can supply the coupling and the extra-low voltage engine by a simple switch connection.</p> |
