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4.5. Servo types
Even if they look the same, technically different servos are availab-
le on the market. It is important that you configure the SwitchPilot
3 servo appropriately to avoid problems.
4.5.1. Analog servos
With a classic servo, the motor is only energized when a pulse
signal is present. Without a signal, it follows the mechanical forces
on the lever. If these servos „hum” in the rest position, you can
ensure silence by switching off the pulse. However, it is possible
that the servos “twitch” when the pulse is switched on again.
For analog servos set the impulse configuration in CV 43 to 3.
4.5.2. Digital servos
With the digital servo, a microcontroller inside the servo ensures
that the motor is readjusted even if there is no external impulse.
These servos also tend to „hum” when not in use, because the
external actuating forces are through the motor should be com-
pensated. A digital servo only comes to rest when the voltage is
interrupted from the outside. The disadvantage of this method,
however, is that the servo can twitch in an uncontrolled manner
when the voltage is reapplied.
Set the impulse configuration CV 43 to 4 for digital servos.
4.5.3. ESU servo drive
With the servo drives (51804 with plastic gears, 51805 with metal
gears), ESU offers particularly small drives that have been specially
optimized for use in model railways. Both are equipped with a
microcontroller whose special programming reliably prevents hum
in the end position.
In addition, the drive is supplied with all the accessories necessary
for the point control and saves you the hassle of searching for
small parts.
Servo Types
