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Products  |  Mechatronics  |  Automation  |  RT 710
RT 710 Hydraulic Servo System Show data sheet (pdf file) Print page
Technical Description

  Servo systems are closed-loop control systems. In many industrial applications it is often required to convert small mechanical motions into a different motions with increased force. Hydraulic systems are particularly suitable for applications where large actuation forces are required. The RT 710 unit allows the operation of a hydraulic servo system to be investigated in detail. A carriage with a mass of 50kg is moved by a hydraulic cylinder. Additional springs and an adjustable hydraulic damper permit static and dynamic loads to be simulated. The displacement of the carriage is established using a potentiometric position sensor and compared against the reference variable. The control deviation is processed in a separate servo amplifier. Depending on the direction of the deviation, a control valve is activated in forward or reverse direction, which in turn produces a corresponding movement of the hydraulic cylinder and the carriage.


  All variables can also be tapped as voltage signals, so that in dynamic processes, for example, the displacement signal can be represented on an oscilloscope. The reference variable can also be applied to the system in the form of a voltage. This implies that, with an additional frequency generator, dynamic tests can be performed and the frequency response recorded.

  The trainer is a mobile unit. Measuring devices can be housed in the built-under cabinet unit.


  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- Familiarisation with the mode of operation of a

  hydraulic position control loop with adjustable load

- Reading and understanding circuit diagrams
- Replacing springs and adjusting the damper
The following exercises require an oscilloscope, FFT spectrum analyser, noise generator and voltmeter (items not supplied)
- Influence of load and system pressure on control

- Influence of the amplifier constants on the stability

  of the closed control loop
- Recording the frequency response


* Complete model of a hydraulic servo control loop1
* Position control with adjustable load conditions1
* Hydraulic cylinder with directly mounted

  control valve1
* Vibration-damped mounting1
* Electronic servo amplifier with built-in recorder

Alternative products
RT 060 -- Training System: Position Control, HSI
RT 700 -- Training System: Fundamentals of Hydraulics

[1] Self-contained training system of a complete hydraulic position control loop with adjustable loading conditions
[2] Oil circuit with hydraulic unit, hydraulic accumulator, 2 manometers, control valve and hydraulic cylinder to move a weighted carriage
[3] Operation of the electromagnetic control valve for position control by proportional amplifier
[4] Proportional amplifier with adjustable
gain and recorder
[5] All control variables available as voltage signals 0...10V
[6] Potentiometric displacement sensor
[7] Adjustable load conditions on carriage using two springs with hand wheel and adjustable damping
[8] Low-friction ball bearing-mounted carriage
[9] Mobile steel profile trolley with built-under unit

Technical Data

Hydraulic unit
- power output: 1,1kW
- flow rate: 3,8L/min
- head: 1500m
- tank capacity: 10L
Hydraulic accumulator capacity: 2L
Accumulator charging valve: max. 40L/min
Hydraulic cylinder
- piston diameter: d=40mm
- stroke: 150mm
- mass moved: 50kg
Control valve NG6
- nominal flow rate: 24L/min
- activation: +/-10V
Potentiometric position sensor
- measuring range: 150mm
- output: 0 10V


Dimensions and Weight
LxWxH: 1600x700x1700mm
Weight: approx. 414kg
Required for Operation
Hydraulics: 400V, 50Hz, 3 phase
Servo amplifier: 230V, 50Hz, 1 phase
Scope of Delivery

1 hydraulic servo system, complete
1 CF card reader + software for recorder

1 set of instructional material

Order Details
080.71000  RT 710  Hydraulic Servo System
© 2005 G.U.N.T. Gerätebau GmbH