| 摘要 |
<p>The release circuit has at least one release relay (K5) in the main current supply, held in the off position in the rest condition. An auxiliary voltage source (T2,V2,C2) is coupled to the control input (A2) of the relay via a switch (S1,S2,S3,S4), to energise the relay and close the main supply source for the bed adjustment control setting motors (M). The auxiliary voltage source uses a transformer (T2), with a residual current of less than 10mA, with two zener diodes (ZD1,ZD2) connected in-series with its primary winding and providing a rectified voltage for a relay energising capacitor (C2) at its secondary. Pref. the electrolytic capacitor has a capacitance of 2200 microfarad.</p> |
