Training Board Servo

The SERVO training board contains a DC motor that is coupled to a potentiometer via a gear. The potentiometer is used for analog position detection.

To protect the potentiometer, its slider is decoupled via an amplifier. The signal at the output is inverted.

The motor of the SERVO training board can be controlled digitally in both directions of rotation via TTL inputs and a downstream logic.

This also allows digital control of the SERVO training board. trigger is led. To adjust the input signal from -10 V... +10 V to the motor voltage of 12 V by means of an amplifier connected in series. The device has a digital encoder, which among other things consists of an encoder disk on which two encoder tracks with different resolution are applied for digital acquisition and further processing of the speed, the angle of rotation and the direction of rotation.

A photoelectric reflex switch is plugged in, whose output signal is fed via a Schmitt trigger.

To investigate different resolutions, the reflex light barrier can be plugged in two positions.

In order to digitally detect the direction of rotation, the encoder has a plug-in field for an additional reflex light barrier, whose output signal has a phase shift of 90°.

If the encoder disk rotates clockwise, the left-hand photoelectric reflex switch always switches first compared to the right-hand one, because it is the first to be reached by a marker (U1 before U2). If the encoder disk rotates counterclockwise, the process is reversed (U2 before U1).

A digital logic evaluates the temporally different signals and makes them available as TTL signals at U1 and U2. The states are additionally indicated optically by LEDs.

A disturbance variable can also be added to the controlled system. This is the mechanical play of the drive (dead time), which is realized electronically with the SERVO training board.

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• Parameters of the speed control system
• Characteristics of the temperature and light control system
• The motor with current or torque control
• Speed control
• Voltage control with a machine generator
• Speed control with subordinate current control
• DC motor on the uncontrolled and controlled single-phase half-wave rectifier
• Four-quadrant operation of a DC motor with a thyristor converter
• Four quadrant operation with one H-bridge
• Electronic load
• Temperature control with P- and PI-controller
• Temperature control with a two-point controller
• Temperature control with PID controller and pulse group control
• Brightness control with P, PI and PID controller
• Bode diagram, locus curve and controllability of a P-T3 system
• Adjustment and smoothing of actual values
• Parameters and operating behavior of the servo control system
• Position control
• Position control with influencing variables

Network connection

Mains voltage: 230 V AC / 115 V AC (110 V AC) mains frequency: 50 - 60 Hz Power consumption: approx. 20 VA

Engine

Nominal voltage: 12 V Power consumption: max. 0.4 A

Encoder disk

Speed: 125 min-1 Resolution 1: 24 lines / 15° turn Resolution 2: 48 lines / 7.5° turn

DC amplifier

Input voltage: 0 ... +/-10 V Gain factor: V = 1.2 Output current: max. 0.5 A

Engine control logic

Entrance above: TTL level; log. 1 ≙ Clockwise rotation Lower entrance: TTL level; log. 1 ≙ Left rotation

Disturbance (switchable)

Simulation of a mechanical play in the drive (electronically realized)

Actual value acquisition (via potentiometer)

Resistance: 5 k (+/-20%) mechanical rotation range: 320° (+/-1.5%), without stop Linearity tolerance: 2%.

Actual value output Decoupled and inverted via amplifier to protect the motor potentiometer

Output voltage: 0 - 10 V Output resistance: 200

2 outputs (U1/U2) The output signals are incremental and only available with plugged reflex light barriers (on request).

Output voltage: TTL, 90° offset to each other, decoupled via TTL module

Evaluation logic Display via two LEDs for clockwise and counterclockwise rotation. The logical 1 or 0 states are additionally available via 2 mm sockets; TTL signal; decoupled via TTL module. The signals are present when both photoelectric reflex switches (Type 5131.5) are plugged in.

Dimensions: 266 x 297 x 90 mm (W x H x D)

Weights: approx. 2.1 kg

Mechanical data The front panel of the BOARD is made of 5 mm thick laminate, color matt blue, and is engraved with white switching symbols corresponding to the built-in function groups. A sturdy plastic hood protects the rear of the unit and its shape allows the unit to be placed at an ergonomically favourable angle on the table.

Adapter panel Serves both for the transition from 4 mm to 2 mm plug connections and for plugging in two adapters (BNC socket two 4 mm plugs)

2 plug fields (4 mm sockets) For inserting the retro-reflective light barriers over the encoder disk. Two plug-in positions are possible for detecting the different resolutions.

Reflection light barrier Plug-in modules with built-in LED photo Darlington transistor

Dimensions: 37 x 56 x 35 mm (W x D x H), without plug Weight: approx. 50 g

The reflective light barriers are included in the scope of delivery.

• Training board SERVO
• 2 x reflex light barrier