FIELD: electricity.
SUBSTANCE: invention is related to safety circuit (200) in lift unit (100). The invention comprises at least one series circuit (43) out of contacts (20a-20d, 26) essential for safety. The contacts are closed at uninterrupted operation of the lift unit (100). When disconnected at least one contact (20a-20d, 26) in certain operating conditions is disconnected by means of semiconductor switches (36a, 36b). The semiconductor switches are controlled by at least one processor (34c, 34d) and monitored for short-circuiting state by at least one control switching circuit (37a, 37b). At least one electromechanical circuit (42a) of the relay with contacts (31c, 31d) is closed by in series contacts (20a-20d, 26) of the in series circuit (43). The relay circuit (42a) is controlled by at least one processor (34c, 34d). In case of short-circuiting the closed in series circuit (43) is interrupted by contacts (31c, 31d) of the relay semiconductor switches (36a, 36b).
EFFECT: development of safety circuit for the lift unit, which allows increase in the lift unit safety.
15 cl, 3 dwg
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