Eight-way electric heater sequence delay switch control produced by 89C2051

Published:2011/4/22 19:17:00 Author:Nicole | Keyword: electric heater, switch control | From:SeekIC

After energizing, 89C2051 resets, and P1.0 ~ P1.7 all the indicator lights off. P3.0 and P3.1are set to high level, to test whether there is start-up singal input in P3.0 port. When S1 is pressed, the start-up singal inputs P3.0 port, after avoiding flutter deal and confirmed by the program, the P1.0 port is set to low level immediately, LED8 lights, OPT08, Q8, J8 turn on, J8 normally open contact is closed, to turn on and control the AC contactor power supply of the first load electric water heater, the first load electric water heater starts working; after 10 seconds delay, the P1.1 port is set to low level, LED7 lights, OPT07, Q7, J7 turn on, J7 normally open contact is closed, to turn on and control the AC contactor power supply of the second load electric water heater, the second load electric water heater starts working; sothe power supply of the eighth load electric water heater is openedat last, thus, the electric water heaters from the first load to the eighth load are all in working condition.



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