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The simple momentary make and break switch works ok but does not make allowances for human error, ie:- if the switch lever is not pushed fully to its limit the contact can stay made, keeping the current flowing to the solenoid and making it overheat, resulting in permanent damage. If a capacitor is discharged into the coil then only a short burst of energy is released making a quick clean movement of the turnout with no buzzing or burning of the solenoid. The relay can be switched using a toggle switch or other device such as a computer interface etc. One of these relay units is installed near each turnout, it,s more electric than electronic but it works, providing only a short burst of power to the coils and avoiding burnouts. Apart from common 24v supply cables, only one control wire per turnout is needed for basic operation. |
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Constant 24v supply on pos and neg. control off = c1 discharge to left coil. control on = c2 discharge to right coil. R1 protects relay contacts. D1 and C3 keep K1 closed just longer than discharge time for C1 when 24v power is lost with fault conditions. This keeps points in set position between switch off and switch on. Switch S1 is part of the coil assy and is used for sending a red signal voltage to the logic bits for the signals
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