| 摘要 |
Substantial circuitry measures are needed to meet the safety regulations governing goods lifts, requiring a large number of electrical components and a complex electrical protective circuit. Besides two levelling switches (F1 and F2), there are only two monitoring switches (KS1 and KS2) located on the cage (1). The levelling switches (F1, F2) are connected in series with two bistable levelling relays and the monitoring switches (KS1, KS2) in series with two bistable door-zone relays; a protective circuit consists of a group of contacts of these relays connected in series and in parallel. The field of application is simplified goods lifts of all kinds. <IMAGE>
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