Festo VABF-S4-1-V2B1-C-VH-20 Vacuum Generator

The Festo VABF-S4-1-V2B1-C-VH-20 (order number 571425) is a highly efficient vacuum block designed for industrial automation applications requiring reliable vacuum generation. This unit integrates an air-saving function with an adjustable ejector pulse, enabling precise control over vacuum levels while minimizing compressed air consumption. The vacuum block is engineered to work seamlessly with Festo VTSA and VTSA-F valve terminals.

Vacuum Generation Specifications

The VABF-S4-1-V2B1-C-VH-20 features a Laval nozzle with a nominal width of 2 mm, generating high vacuum levels suitable for demanding gripping and handling tasks. The ejector characteristics support both high vacuum and standard vacuum modes, with the muffler construction type open for efficient exhaust. Operating pressure range is 4 to 8 bar, with a nominal operating pressure of 6 bar. The vacuum generator achieves a maximum vacuum of -0.999 bar and includes a built-in vacuum switch with threshold value compare capability. Noise level is rated at 78 dB(A) during operation.

Integrated Functions

This vacuum block incorporates multiple advanced functions: an ejector pulse valve for controlled vacuum release, an electric flow control shut-off valve, an electrical air-saving function that automatically deactivates the generator when set vacuum is reached, and a non-return valve to maintain vacuum without continuous air supply. The integrated vacuum switch provides real-time pressure monitoring with piezo-resistive measurement and threshold value hysteresis adjustment from -0.9 bar to 0 bar. Short-circuit protection and overload protection are included for all electrical connections.

Electrical Specifications

The vacuum block operates on 24V DC with a permissible voltage range of 21.6V to 26.4V. Coil power consumption is 1.3 W with a duty cycle of 100%. The valve function is 5/3-way pressurized configuration with normally open contact switching. Maximum output current is 50 mA with a voltage drop of 1.5V. Idle current ranges from 50 mA to 150 mA. Reverse polarity protection is provided for all electrical connections, and inductive protective circuits are adapted for MZ, MY, and ME coils.

Construction and Materials

The housing is manufactured from wrought aluminum alloy with galvanized steel screws, ensuring durability in industrial environments. Seals are made of NBR material, while the plug housing uses die-cast zinc with nickel plating. Pin contacts are brass with gold-plated surfaces for reliable electrical connectivity. The inspection window is made of PA material, and the keypad uses TPE-U. The product weight is 1120 grams.

Environmental Conditions

The vacuum block is rated IP65 for protection against dust ingress and low-pressure water jets. Operating and ambient temperature range is 0°C to +50°C, with medium temperature also between 0°C and 50°C. The operating medium is compressed air conforming to ISO 8573-1:2010 [7:4:4] quality standards; oil lubrication is not possible. Corrosion resistance class is 0, indicating no corrosion stress under normal conditions. LABS conformity meets VDMA24364 zone III specifications.

Mounting and Connectivity

The vacuum block mounts on a sub-base with size 26 mm as per ISO 15407-2. Pneumatic connections (ports 1 and 3) are also via the sub-base. The electrical connection uses a 4-pin plug-in connector compliant with ISO 15407-2. A built-in LED provides visual signal status indication. The structural design is non-modular, and the mounting position can be any orientation. The manual override features detenting, non-detenting, and covered options. A green LED indicates presence of compressed air when the system is operating with adequate pressure.

Compatibility with Valve Terminals

This vacuum block is specifically designed for use with Festo VTSA and VTSA-F valve terminals, providing galvanic isolation between the valve terminal and the vacuum block to ensure safe operation and prevent electrical interference. It also works with 5/3-way pressurized normally open valves.

Applications

The VABF-S4-1-V2B1-C-VH-20 is ideal for pick-and-place systems, packaging machinery, material handling, and automated assembly lines. Its air-saving function significantly reduces energy consumption, making it suitable for continuous operation where vacuum efficiency is critical.

Conclusion

The Festo VABF-S4-1-V2B1-C-VH-20 vacuum generator combines advanced ejector technology with energy-saving features, offering reliable vacuum generation in a compact, rugged package. Its integration with VTSA valve terminals, IP65 protection, and comprehensive diagnostics make it a versatile choice for industrial vacuum applications.