TIMER DEVICE FOR DIFFERENT FREQUENCY COMMERCIAL POWER SUPPLY

PURPOSE:To make the quantity of shift almost equal to a district having a commercial power supply of different frequency by giving a prescribed count number at each plural seconds and obtaining a desired time limit while using the said plural seconds as the unit time. CONSTITUTION:When a timer set switch 16 is turned on and the level of an input terminal 22 goes to a high level, a microcomputer 14 enters the timer operation, a power rising waveform pulse to an input terminal 23 is detected and the counter is counted up for 2sec. When the counter is counted by 109 number of times, the 2-sec counter is cleared and a 1-hour counter in which a desired time, in this case, 1 hour, is set is counted up by using 2-sec as the unit. Then 1800 times of count-up are waited, the counter is counted by 1800 number of times, the time is over and the timer operation is finished. The level of an output terminal l20 goes to Lo, a driver IC25 is turned off, a relay 3b is deenergized, a contact 3a is opened to stop a fan motor 2.