Festo PDAD Series Application Note
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Festo PDAD Series Application Note

Energy management function at adsorption dryer
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Application note
Energy management function at
adsorption dryer PDAD
Application note for use of the energy management function at
PDAD-...-...
adsorption dryer PDAD. Explanation, use and layout of purge air
regulation for reducing air consumption.
100152

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Summary of Contents for Festo PDAD Series

  • Page 1 Application note Energy management function at adsorption dryer PDAD Application note for use of the energy management function at PDAD-…-… adsorption dryer PDAD. Explanation, use and layout of purge air regulation for reducing air consumption. 100152...
  • Page 2 Festo AG & Co. KG. Festo AG & Co KG reserves the right to make modifications to this document in whole or in part. All brand names and product names are trademarks or registered trademarks of their respective owners.

  • Page 3: Table Of Contents

    Table of contents Table of contents Utilised components, documentation......................4 Utilised components............................ 4 Documentation ............................4 Description and purpose of the application note ..................5 Introduction to the subject matter ....................... 5 PDAD functions............................6 Reasonably foreseeable misuse ........................7 Environment used in ............................

  • Page 4: Utilised Components, Documentation

    Animation: https://www.festo.com/net/en-gb_gb/SupportPortal/Flash/378325/376353/en/index.htm --> Further documents and publications regarding this subject can be found at the Support Portal operated by Festo AG & Co. KG. Application Note – Energy management function at adsorption dryer PDAD – 1.10 Page 4 of 17...

  • Page 5: Description And Purpose Of The Application Note

    Description and purpose of the application note Description and purpose of the application note Introduction to the subject matter The adsorption dryer PDAD is used to reduce the pressure dew point to -70° C for corresponding use, e.g. handling powders, in climatised rooms and in the pharmaceuticals and chemicals industries. Brief explanation: Adsorption (from the Latin adsorpio, from adsorbere (“draw in”) is the designation for the enrichment of substances from gases or liquids at the surface of a solid, generally at the interface (matter) between two phases.

  • Page 6: Pdad Functions

    These functions are integrated, but they’re not described in the operating instructions. The software is neither provided by Festo nor is it available, because the device can be damaged in the event of incorrect settings. The PDAD is also equipped with an alarm connection which is described in the operating instructions. A visual or acoustic remote alarm system can be connected outside of the dryer via this connection (type C DIN plug).

  • Page 7: Reasonably Foreseeable Misuse

    User groups • Specialists in the field of pneumatics • Specialists in field of electrical engineering • Sales engineers at Festo AG & Co. KG Application note – Energy management function at adsorption dryer PDAD – 1.10 Page 7 of 17...

  • Page 8: Layout Of Purge Air Regulation For Reducing Air Consumption

    Layout of purge air regulation for reducing air consumption 2 Layout of purge air regulation for reducing air consumption Nature of the task Regenerative dryers have to eject a portion of the process air in order to remove the moisture which accumulates inside them.

  • Page 9: Use Of A Manual Switch For Purge Regulation

    Layout of purge air regulation for reducing air consumption Use of a manual switch for purge regulation This is the simplest setup. When air is not used downstream from the dryer, the purge function is shut down by means of a manual switch. This layout is frequently used in systems which act upon the point of consumption (point-of-use or POU systems).

  • Page 10: User Of A Dew Point Transmitter And A Process Regulator For Purge Regulation

    Layout of purge air regulation for reducing air consumption User of a dew point transmitter and a process regulator for purge regulation The best alternative for purge regulation when the degree of dryness (pressure dew point) of the air from the dryer is critical.

  • Page 11: Use Of A Simple Pressure Switch For Purge Regulation

    Layout of purge air regulation for reducing air consumption Use of a simple pressure switch for purge regulation Many compressors are furnished with pressure switches which include additional contacts, by means of which the dryer’s purge function can be shut down when the compressor is in the discharged state. Unfortunately, many of these switches have considerable dead zones or a large hysteresis (difference or reset point between the charge (on) and discharge (off) settings, which in most cases cannot be changed).
  • Page 12 Layout of purge air regulation for reducing air consumption Dryer regulator Pin 1 (reads out +5 V DC signal) Pin 2 Pressure switch (installed in the field) Current- free when open Current- free Signal output when closed * Return signal * Current-free when closed –...

  • Page 13: Use Of A Pressure Sensor For Purge Regulation

    Layout of purge air regulation for reducing air consumption Use of a pressure sensor for purge regulation If a pressure sensor is used, it’s best to use a programmable variant. In the final analysis, this type of pressure sensor is a pressure transmitter and a process regulator in a single component. Although a programmable pressure sensor is a bit more expensive than a simple mechanical pressure switch, it can be much more favourably configured.

  • Page 14: Establishing A Connection Between Switching Device And The Energy Management Contact At The Pdad

    Layout of purge air regulation for reducing air consumption Establishing a connection between switching device and the energy management contact at the PDAD The adsorption dryer is shipped with activated purge air function as a default setting, i.e. purge air is also active at times when little or no purge air is required.
  • Page 15 Layout of purge air regulation for reducing air consumption The jumper must be removed in order to use the EM function. Terminals 1 and 2 at the EM socket are then connected to the NC contact of the corresponding switching device (manual switch, directly to a pressure switch or a relay).
  • Page 16 Layout of purge air regulation for reducing air consumption 4. Connect external switching logic (NC contact of the manual switch, the pressure switch or on the relay) to terminals 1 and 2 in the plug insert of the DIN plug. Make sure that the wires and cables are correctly stripped and that good insulation is assured through the cable gland! 5.

  • Page 17: Safety

    11 of these operating instructions. Any other use of the device is deemed use for other than the intended purpose. Festo is not liable for damages which result from use for other than the intended purpose.

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