D-Link DSL-G684T Bedienungsanleitung PDF herunterladen (Seite 7)

designed to take position angle between 0 and 180 degrees. Most mechanisms have

limiters that do not allow a greater swing of the shaft. In fact, servos are mainly used in

positioning systems such as cameras, electronic equipment equipped with mechanical

positioning, aircraft models to set primaries. Those applications put pressure on accuracy,

ease of operation and low power consumption instead of full rotation. Wherever full

rotation is needed stepper motors or DC motors are used.

The servomotor is connected with control system with three wires: positive supply,

ground and control signal. These wires are color coded. The red wire is the DC supply and

must be connected to a DC voltage supply in range of 4.8V to 6V. The black wire is to

provide ground and third one which occurs in variety of colors to provide control signal.

Unlike DC motors it is important not to revers ground and supply connections due to

possibility of damaging servo.

Moving shaft to a desired angular position is obtain via a control line by pulse-

width modulation (PWM). The location of the shaft is set to an appropriate length of the

pulse on this line. Servo has a built-in 50Hz generator. It means that in every 20ms control

line signal of appropriate length should be given to maintain control. The standard for most

Figure 2. Pulse servo control

[source: http://www.engineersgarage.com/articles/servo-motor]

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D-Link DSL-G684T Bedienungsanleitung Seite 7