8
should have to keep.
The nominal position will be set by a pulse line (orange on
Graupner ® servos, otherwise white). A constant voltage (4.8 V
- 6V) completes the interface.
On the pulse line the servo expects in a time interval of 20 –
25ms a positive impulse with a length between 1.0ms and 2.0ms.
The length of the pulse is directly proportional to the desired
target position.
If the servo does not receive a signal, the motor gets no power,
so it follows the mechanical forces on the lever.
Servos are available in various designs and sizes. They differ also
in the gear box and actuator angle. There are, for example, servos
to make wind sail adjustment, which makes several revolutions.
ESU offers with the servo motor (51803) a very small servo drive.
This includes all the necessary parts for the switches or turnouts
and you don’t need to search for all these small parts.
Never try to turn the actuator of a servo by hand. The gears
of the servo can be destroyed.
5.2.4. Relay outputs
SwitchPilot Extension
Outputs 1 through 4 each offer a relay output A and B which are
switched together (DPDT, bi-stable). Each relay output
corresponds with the transistor output of the SwitchPilot or the
servo output of the SwitchPilot Servo: If output A is active (or
servo setting A is reached) the terminals I and Com of the relay
output are connected. Is output B on the SwitchPilot active (or
servo setting B is reached) the terminals II and Com are connected.
5.2.5. Feedback inputs
SwitchPilot
Through RailCom® the SwitchPilot can send the current turnout
position back to the digital control unit. For this the turnout needs
to have the corresponding feedback contacts which must be
connected to feedback contact input FB A and/or FB A. (see Figure
7.7 for details)
5.2.6. Push Button Inputs
SwitchPilot Servo
The SwitchPilot Servo can also be used without a digital system.
The setting of servos 1 through 4 can be set with external push
buttons. These could be toggle switches or push buttons known
from the famous analog switch boards. (See Figure 13 for more
details)
6. Connection to the digital system
We recommend setting all parameters of the SwitchPilot prior
to installing the unit on your layout.
6.1. Connecting elements of the SwitchPilot
Figure 1 on the right shows the SwitchPilot and SwitchPilot Extension.
Figure 1 shows the SwitchPilot together with the optional
SwitchPilot Extension module.
a) Wire turnouts, signals, un-couplers or similar devices to the
terminals of the (transistor) outputs 1 to 4. The terminals FB A
and FB B are used for status feedback of the device.
b) This multi-pin connector serves to wire two commercially
available RC-Servos (e. g.: Graupner®, Futaba® or ESU) and
represents the outputs 5 and 6 of the SwitchPilot.
Relay outputs
