Model-based proportional pressure regulation
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With the Motion App „Model-based proportional pressure regulation“ there are two pressure regulators per valve slice at the two valve outlets, which you can use to generate pressures regulated independently of each other. The integrated sensors precisely monitor the pressure. Along with the internal pressure sensors (connections 1, 2, 3, 4) a status controller/observer structure is used. The volume and the hose are taken into account based on the model.
As a user, you need to specify the volume, the tube diameter and the tube length. This way, you do not need an externally attached sensor – which is particularly interesting for clean design. Additionally, with model-based pressure regulation, differential pressures can be compensated for, which come about as a result of different tube lengths and diameters. This way, even with long tubing lines, you can achieve precise and dynamic pressure regulation.
The pressure regulator is also suitable for vacuum applications. For vacuum applications, a vacuum is attached to channel 3. On channel 1, you can connect up the pressure at the same time, for example, for an ejector pulse. The possible area of application covers pressure control for volume, power control for the known effective area, the activation of process valves, vacuum control with regulated ejector pulse and special, highly dynamic pressure regulation profiles (pressure sequence control).
When being used at the same time, you need to order exactly the right number of separately available Motion Apps you use on the Festo Motion Terminal VTEM.
Characteristic pressure curve of simple pressure regulators
| Nominal pressure | Pressure at the valve | Pressure in the system | |
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Slow pressure rise in the system |
Pressure curve of motion terminal with „Model-based proportional pressure regulation“
| Nominal pressure | Pressure at the valve | Pressure in the system | |
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Fast rise in pressure in the system due to intermittently increased pressure at the valve. |
- Pressure:
- -0.9 … +8 bar
- Minimum volume:
- 50 ml
- Maximum volume:
- 2 l (larger volumes can also be regulated, however the valve does restrict the flow rate)
- Specifications in the Motion App and via PLC control:
- Nominal pressure at channel 2
- Nominal pressure at channel 4
- Return to controls:
- Actual pressure at channel 2
- Actual pressure at channel 4
- Recommended tube lengths and volumes:
- 1 m … 5 m
- Currently, just one tube length of greater than one meter is supported (>1 m)
- Only for volumes with minor changes ±10%
- Notice:
- A filter must be installed upstream of valves operated in vacuum mode. This prevents any foreign matter in the intake air getting into the valve, e.g. when operating a suction cup.
- When using an internal pilot air supply, the necessary minimum pressure (3 bar) in channel 1 is to be maintained.
- The sensors are structurally protected against contamination.
- Both the supply pressure at port 1 and the ventilation pressure at port 3 are detected. If a vacuum is connected to port 3, the current low pressure value will be determined.
- When using hoses PUN4, the rule characteristic C1 should be selected.
- Zero volume (contaminated value output): best with CS setting, with control characteristic C1 a stable control behavior with overshoot can be achieved.
- If the pressure-setpoint specification for valve output is greater than the internally determined supply pressure, the internal pressure nominal value will be restricted to the internally determined supply pressure.
- If the pressure setpoint specification for a valve outlet is less than the ventilation pressure of +0.1 bar, this outlet will be exhausted fully with regulation.
- Static characteristic values (corresponds to FN 942030) valid from -0.9 … 7 bar:
- Linearity error in range 5% ... 95% setpoint value under nominal conditions, relevant to ideal characteristic curve: 170 mbar
- Repetition accuracy in range 5% ... 95% setpoint value under nominal conditions: 80 mbar
- Max. hysteresis in range 5% ... 95% setpoint value under nominal conditions: 80 mbar
- Overall accuracy in range 5% ... 95% setpoint value under nominal conditions: 210 mbar
- Response sensitivity in range 5% ... 95% setpoint value under nominal conditions: 80 mbar
- Max. temperature error in entire T-range in addition to the overall accuracy: ± 50 mbar
- Zero point suppression:
- Setpoint value less than 100 mbar over ventilation pressure--> exhaust
- Nominal value 120 mbar or more over ventilation pressure--> control active
- Dynamic characteristic values (corresponds to FN 942030) valid from 0 … 7 bar:
- Recovery time (hose PUN 8, 2 m, volume 0.1 l Setpoint value jump 25% 75% 25%):
- <0.5 s
- Permitted overshoot with suddenly changing setpoint values (volume 0.1 l):
- <5 % FS
