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ELECTRONIC PNEUMATIC POSITION CONTROL EPPC™

EPPC™ real-time level control achieves an optimum production accuracy of +/- 10 µm and a significant reduction of the deflection and settling times in response to dynamic load changes Intelligent browser-based user interface for setting, diagnostics and monitoring.

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General PRODUCT DESCRIPTION

  • The Electronic Pneumatic Position Control EPPC™ offers optimum vibration isolation and leveling for highly dynamic and vibrationsensitive machines and instruments.
  • The EPPC™ can be combined with three or six BiAir® membrane air spring control groups to control up to six degrees of freedom. Bilz offer a wide range of different size air springs for system design.

The powerful electronics, consisting of a 14bit AD converter and 16bit signal processor, are integrated into the pressure control valves and thus ensure almost noise-free control. Losses (pressure drops) within the hose connections are minimised by directly connecting the pressure control valves to the respective air springs. The use of CAN bus technology means that the control unit can be installed up to 20 m away. The EPPC™ is consequently suitable for use in sensitive environments such as clean rooms or laboratories.

TECHNICAL DATA

System Installation

  • Optimum positional accuracy (+/-10 µm)
  • Individually adjustable system parameters (such as damping)
  • Short deflection and settling times in response to load changes
  • One high-performance servo valve and one displacement sensor per degree of freedom
  • Optimised connecting system using CAN bus technology
  • Intelligent browser-based user interface for setting, diagnostics and monitoring, connection via Ethernet, remote maintenance possible
  • Operator status display (e.g. ready, working position, motion complete, error)
  • Digital I/O interfaces for external control and monitoring
  • Noise-free control due to high-resolution signal processing and servo-valve technology
  • Robust and proven air spring technology, can be combined with Bilz BiAir® membrane air springs
  • No disturbing heat generation, magnetic field fluctuations or high power consumption as in electromagnetic actuators

Information About Graphic

Theoretical vibration curve of a mechanical-pneumatic level control system (MPN) compared to the EPPC™.
At a deflection of -80 μm, the MPN reaches a stable position within +/−15 μm after approx. 0.75 seconds. With the EPPC™, the deflection time is reduced by approx. 45 % to 0.4 seconds.

TECHNICAL DATA OVERVIEW

Typical system load* 800 kg – 120.000 kg
Vertical natural frequencies* 1.2 – 2.5 Hz
Horizontal natural frequencies* 2,2 – 2,8 Hz
Type of control Servo-pneumatic
Clean room suitable yes
Communication interfaces Ethernet, Digital I/O

SENSOR RESOLUTION

Displacement measuring system 0.76 µm
Pressure sensor 0,36 mbar
Sampling rate sensor signal 1 kHz (after oversampling)

* Customised modifications possible

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