Hettich EBA 20 Repair Instructions
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Hettich EBA 20 Repair Instructions

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EBA 20
EBA 20 C
Repair instructions
08.08
Andreas Hettich GmbH & Co. KG
AR2002EN

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Summary of Contents for Hettich EBA 20

  • Page 1 EBA 20 EBA 20 C Repair instructions 08.08 Andreas Hettich GmbH & Co. KG AR2002EN...
  • Page 2 (07461) 705-0 (07461) 705-125 info@hettichlab.com, service@hettichlab.com www.hettichlab.com © 2007 by Andreas Hettich GmbH & Co. KG All rights reserved. No part of this publication may be reproduced without the prior written permission of the copyright owner. Modifications reserved! AR2002EN / 08.08...

  • Page 3: Table Of Contents

    Control panel A3 ....................7 Power board A1 ....................7 Motor M1......................7 Lid lock Y1 ......................8 Imbalance switch S2 (only with EBA 20 C) ............8 Troubleshooting procedures..................8 Error messages......................9 MAINS RESET....................9 Brief description ....................9 Description and elimination of errors...............
  • Page 4 Technical documents ..................24 11.1 Connecting diagrams..................24 11.1.1 Abbreviations of the cable colours............24 11.1.2 Connecting diagram EBA 20 / EBA 20 C..........25 11.2 Signals and measurements ................26 11.2.1 Motor M1 ....................26 11.2.2 Speedsensor B3 (speedometer).............. 26 11.2.3...

  • Page 5: Introduction

    In such an event any guarantee claim or liability claim against the Andreas Hettich GmbH & Co. KG company expire. • Only original spare parts and original accessories licensed by the Andreas Hettich GmbH & Co. KG company are allowed to be utilised.

  • Page 6: Description Of The Centrifuge

    Description of the centrifuge The EBA 20 / EBA 20 C is a microprocessor-controlled centrifuge which is comprised of the following electrical components: • Control panel • Power board • Motor with speed sensor (speedometer) • Lid lock system • Imbalance switch (only with EBA 20 C)

  • Page 7: Control Panel A3

    • Monitoring of the motor current. • Braking of the motor with brake resistor • Plugging station of the imbalance switch (only with EBA 20 C) • Evaluation of the imbalance switch (only with EBA 20 C) • Plugging station of the lid lock •...

  • Page 8: Lid Lock Y1

    (open/closed) and report it to the power board. Imbalance switch S2 (only with EBA 20 C) • A microswitch (break contact) detects any imbalance. • Imbalance can only be detected in running mode (starting, centrifuging and braking).

  • Page 9: Error Messages

    Error messages The error message will be indicated in the speed display of the front panel e.g. : START RPM x 100 STOP MAINS RESET • Switch off the mains switch. • Wait at least for 10 seconds and then switch on the mains switch again. Brief description Display.

  • Page 10: Description And Elimination Of Errors

    • Weight difference in rotor components. • Imbalance switch is defective or not connected. • Imbalance switch is disadjusted (Adjustment see section "Imbalance switch-off (only with EBA 20 C)"). • Loose contact in cable or plug ST6. • Power board (A1) is defective.
  • Page 11 Measurement Imbalance switch, plug ST6 pin 1 to Pin 4. Switch is an opener. See also section 11.2.4. Error code reset Open the lid after standstill – 4 – Communication Error Communication error between control board (A3) and power board (A1). Error Drive switches off and rotor runs down unbraked.

  • Page 12: Defects Without Error Indications

    Proceed as the followings: 1. Set the correct machine version with the keys beneath the time indicator. EBA 20 EBA 20 C 2. Press the key in order to store STOP the set machine version. 3. Perform an MAINS RESET.
  • Page 13 The lid can not be opened Error The lid can not be opened. The rotation display shows (lid open). • Microswitch at lid lock is defective Error cause • Loosen contact on plug ST4 / pin 5 and pin 6 •...

  • Page 14: Settings And Enquiries

    Control panels supplied as spare part are set to machine version 4 (ROTOFIX 32). After installing the control panel the EBA 20 must be set to machine version 1 and the EBA 20 C to machine version 5. If another machine version than 1 or 5 is set in the control panel, the set machine version will appear in the display after switching on the centrifuge.

  • Page 15: Enquiry The Machine Version

    EBA 20: START START RPM x 100 RPM x 100 STOP STOP EBA 20 C: START START RPM x 100 RPM x 100 STOP STOP If the machine version and brake step are not displayed, press the key under the speed indicator until they are displayed.

  • Page 16: Enquiry The Programme Versions

    EBA 20: START START RPM x 100 RPM x 100 STOP STOP EBA 20 C: START START RPM x 100 RPM x 100 STOP STOP 4. Press the key beneath the speed indicator so often until the programme version of the control panel (e.g.

  • Page 17: Setting The Brake Step

    EBA 20: START START RPM x 100 RPM x 100 STOP STOP EBA 20 C: START START RPM x 100 RPM x 100 STOP STOP If the machine version and brake step are not displayed, press the key under the speed indicator until they are displayed.

  • Page 18: Locking The Input Of The Speed, Time And Brake Step And Locking The Key (Only With Eba 20 C)

    Locking of the key and locking of the input of the speed, time and brake step is only possible with machines with machine version 5 (EBA 20 C) and a programme version of the control panel from b1.40. The activation and deactivation of the lock is only possible if the rotor is at standstill.

  • Page 19: Imbalance Switch-Off (Only With Eba 20 C)

    Imbalance switch-off (only with EBA 20 C) The permissible imbalance is specified for rotor E1824 by the indication of the difference in weight of opposite rotor positions. When having a difference in weight within the range of 6g to 12g during run-up, the drive has to switch off before reaching 1500 RPM.

  • Page 20: Functional Check After A Repair

    • Sample temperature. Values see operating instructions chapter "Anhang/Appendix, Rotoren und Zubehör/Rotors and accessories". • Imbalance switch-off (only with EBA 20 C). Values see chapter "Imbalance switch- off (only with EBA 20 C)". • Current consumption. Values see chapter "Technical specification".

  • Page 21: General Arrangement Of The Components

    Housing upper part Cover foil Control panel Lid lock Motor Rubber-metal- bearing Power board Appliance plug 10 Housing lower part 11 Rubber foot 12 Friction rubber 13 Hinge bolt Imbalance switch is not displayed (only with EBA 20 C) 21/31...

  • Page 22: 10 Assembling And Disassembling Components

    Mains switch 10.6 Appliance plug 10.6 Imbalance switch (only with EBA 20 C) 10.7 Before assembling or disassembling components, the following working processes must first be carried out to reach the components. Make a note of the plug numbers ! The components are assembled in reverse order ! •...

  • Page 23: Power Board A1

    • Remove the plugs and the earth connection. • Exchange the appliance plug. 10.7 Imbalance switch S2 (only with EBA 20 C) • Pull off plug ST6 from the power board A1. • Remove the fastening screws of the imbalance switch S2 from the sheet metal holder.

  • Page 24: 11 Technical Documents

    11 Technical documents 11.1 Connecting diagrams 11.1.1 Abbreviations of the cable colours Abbreviation Colour black brown blue gold green GNYE green-yellow grey orange pink silver turquoise Transp. transparent violet white yellow 24/31...

  • Page 25: Connecting Diagram Eba 20 / Eba 20 C

    11.1.2 Connecting diagram EBA 20 / EBA 20 C ST1.2 BU (BK) BN (WH) Leistungsteil A1 ST1.1 power board A1 ST3.2 ST3.1 Drehzahl- Motor Deckelverriegelung Unwuchtschalter Gerätestecker sensor (Tacho) motor lid lock (nur in EBA 20 C) mit Netzschalter speed sensor...

  • Page 26: Signals And Measurements

    11.2 Signals and measurements 11.2.1 Motor M1 Field coil Pull off plug ST1 and measure at the plug between pin 2 and pin 3: 230 V version: ≈ 110 Ω 115 V version: ≈ 28 Ω Armature coil Pull off plug ST1 and measure at the plug between pin 1 and pin 2: 230 V version: ≈...

  • Page 27: Lid Lock Y1

    230 V version: ≈ 2.25 KΩ ≈ 400 Ω 115 V version: 11.2.4 Imbalance switch S2 (only with EBA 20 C) Remove plug ST4 and measure at the plug between pin 1 and pin 4: ≈ 0 Ω Switch closed: ∞...

  • Page 28: Technical Specifications

    11.3 Technical specifications Andreas Hettich GmbH & Co. KG Manufacturer D-78532 Tuttlingen Model EBA 20 Type 2002 2002-01, 2002-91 Mains voltage (± 10%) 208 - 240 V 1∼ 100 - 127 V 1∼ Mains frequency 50 - 60 Hz 50 - 60 Hz...
  • Page 29 Andreas Hettich GmbH & Co. KG Manufacturer D-78532 Tuttlingen Model EBA 20 C Type 2002-C 2002-01C Mains voltage (± 10%) 208 - 240 V 1∼ 100 - 120 V 1∼ Mains frequency 50 - 60 Hz 50 - 60 Hz...

  • Page 30: 12 Index

    12 Index – 1 – Tacho error ......................10 – 2 – System reset ......................10 – 3 – Imbalance ......................10 – 4 – Communication ....................11 – 5 – Overload ......................11 – 7 – Overspeed ......................11 –...
  • Page 31 No display........................13 No speed indication....................... 12 Permissible imbalance ....................19 Power board ......................7, 23 Programme versions enquiry..................16 Settings ......................... 14 Signals .......................... 26 Speed input locking ....................... 18 Speedometer......................... 26 Speedsensor ......................... 26 Tachosignal ........................26 The lid can not be opened ..................... 13 Time input locking ......................

This manual is also suitable for:

Eba 20 c

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