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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 transducer 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 experimentation stand is a mobile unit. Measuring devices can be housed in the built-under cabinet unit.
The clearly structured and comprehensive instructional material provides a step-by-step guide through the experiments. |
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Learning Objectives / Experiments |
- Familiarisation with the mode of operation of a hydraulic position control loop with adjustable load conditions
- 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 accuracy
- Influence of the amplifier constants on the stability of the closed control loop
- Recording the frequency response
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Features
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* Complete model of a hydraulic servo control loop1
* Position control with adjustable load conditions1
* Differential hydraulic cylinder with directly mounted control valve1
* Vibration-damped mounting1
* Electronic servo amplifier with built-in line recorder |
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Alternative products
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RT 060 -- Training System: Position Control, HSI
RT 700 -- Training System: Fundamentals of Hydraulics
TM 900 -- Mechanical Control System
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| Specification |
[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 differential 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 3-channel line recorder
[5] All control variables available as voltage signals 0...10V
[6] Potentiometric displacement transducer
[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
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| 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
Differential cylinder
- piston diameter: d=40mm
- stroke: 150mm
- mass moved: 50kg
Control valve NG6
- nominal flow rate: 24L/min
- activation: +/-10V
Potentiometric position transducer
- measuring range: 150mm
- output: 0 …10V |
| Dimensions and Weight |
l x w x h : 1450 x 660 x 1650 mm
Weight : approx. 200 kg |
| Connections |
Hydraulics: 400V, 50Hz, 3 phase
Servo amplifier: 230V, 50Hz, 1 phase |
| Scope of Delivery |
1 hydraulic servo system, complete
1 set of instructional material |
| Order Details |
080.71000 RT 710 Hydraulic Servo System
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