PZS-1 - Tams

Function of the five inputs
English
Input "BREMS": An earth impulse at this input initiates the braking
phase for station 1 or 2, depending on the direction of travel. The
braking phase can only start after normal speed of at least 2 seconds.
Input "STOP": An earth impulse at this input immediately ends the
braking phase and the train stops. This function can only be performed
during the braking phase!
Input "LANGSAM": An earth impulse at this input gradually reduces the
speed of the train, e.g. to pass a set of points or a building-site with
reduced speed. After the length of time set at the trim-pot, the speed
gradually increases to normal speed. The reduced speed level
automatically finishes at the beginning of the braking phase and does
not work in acceleration and braking phases.
Input "HEIMAT": As long as the contact is open, the train shuttles
between the two terminus stations. When the contact is connected to
earth, the train stops on reaching the home station. When the contact
is opened again, the shuttle-train service starts again.
Input "BLINK": An earth impulse at this input initiates a double
flashlight (e.g. for a level crossing). After at least 2 seconds the double
flashlight can be switched off by a second earth impulse or by starting
the braking phase. After 2 more seconds it can be switched on by a
new earth impulse. The double flashlight cannot be activated during the
acceleration, braking, or during reduced speed level.
Function of the circuit
The following information is for experienced electronics users and is not
required for the safe and correct assembly and fitting of the module.
A program saved on to the micro-controller controls the different
phases of the shuttle-train service. Accelerating and braking generate a
PWM (pulse-width modulation), which is converted into a direct voltage
by the RC-combinations R2/C5 and R1/C6. When accelerating or
braking the change in the PWM generates a gradually rising or falling
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