Electromechanical Timer Replacement - 320Volt

Electromechanical Timer ReplacementHARDWAREThe schematic diagram is shown in Figure 2.FIGURE 2:SCHEMATIC DIAGRAMC1C2BatteryD1D2D3D4D5D6D1D2D3D4D5D6R2C3D13R3C4S4Line InNeutral InNeutral OutS1S2S31 U1VDD 57 GP2GP0PIC12C5086GP1 2GP54GP3 GP43Vss8R1ClockDataOpto-RelayDisplayLine OutNote 1: GND symbol is circuit common; it is not tied to AC ground.2: In case of DC input voltage, C4 should be replaced with a resistor to limit current flow through the LEDs(R3 may be removed).3: If the input voltage is 36V or less, the opto-transformer may be removed.4: DISPLAY means AY0438 IC with LCD panel added.5: A FUSE is required in-Line In-circuit.The Timer Parts ListCapacitors:C1, C3 = 47 µF electrolyticC2C4Diodes:D1 – D6D7 – D12D13Resistors:R1= 0.1 µF ceramic= 1 µF (depends on the current flowlimits through LEDs)= Any type IR photo diodes= Any type IR light emitting diodes= 1N4001 general purpose 1A rectifier= Depends on the type of opto-relay:VOVLEDILED= PICmicro output low voltage(0.6V max)= Input opto-relay IR LEDvoltage (0.8V typical)= LED current (10 mA typical)3 – VLED – VoR1 = ----------------------------------- = 160ΩILEDR2R3Miscellaneous:= 100Ω (depends on the current flowlimits through transformer LEDs andoutput voltage of photo diodes batteryto provide minimal charge current forthe battery)= 1 MΩ, used to discharge capacitor C4Battery = 3V AccumulatorOpto-relay = Any opto-relay or opto-triac matchingabove specified requirementsS1 – S3 = Normally open push button switchesS4 = Two position switchU1 = PIC12C508 programmed withMyTimer codeMICROCHIP TOOLS USEDAssembler/Compiler Version:MPASM version 1.40DS40160A/1_002-page 2© 1997 Microchip Technology Inc.