Tranformer 220 to 12 V gives power to the watering computer and to the windscreen wipers motor.Bridge rectifier 25 a. 2 capacitors 6800 μF - 25 V.
4 limit switches. 1 fuse 220 V 10 A. 1fuse 12 V 20 A after the bridge before the relays.1 thermal fuse to the motor 20 A.
The first order at 6 o clock IN THE FIRST ST.(start time) in the A program for 3 min. All the other stations of A PR. 0 min. The second order at 21 o clock in the b program(SECOND STATION) for three minutes.All the other stations of B PR. 0 min.
The duration from top to the bottom is about 1.5 min.
The first up and down limit switches stop the order.(1st order to the 1st station and then to the 1st relay -second order to the second station and then to the second relay).(relays 12 V ac to the coil - conducts 20-25 A).The second up and second down limit switches connected in serrie cut the power to the computer if there is short circuit to the first limit switches.(to not have serious damage).
Connect the bridge with the 2 relays and drive them with opposite polarity to the motor. The 2 orders never come together so we don΄ t have short circuit.
In the winter we change the program.The system works at 12.3 V at 90-110 W.
Thank you for watching my construction.
YOU CAN SEE THE CONSTUCTION HERE.