Hettich EBA 20S Setup guide

03.08 Andreas Hettich GmbH & Co. KG AR2080EN
EBA 20S
Repair instructions

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Andreas Hettich GmbH & Co. KG
Föhrenstraße 12, D-78532 Tuttlingen / Germany
Phone [phone]
Fax [phone]
[email protected], [email protected]
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.
Änderungen vorbehalten!
AR2080EN / 03.08

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Contents
1Introduction ..............................................................................................................5
2Symbol meanings.....................................................................................................5
3Description of the centrifuge.....................................................................................6
3.1 Control panel A3 ...............................................................................................7
3.2 Power board A1 ................................................................................................7
3.3 Motor M1...........................................................................................................8
3.4 Speed sensor B3...............................................................................................8
3.5 Brake resistor R1 and Overtemperature fuse F3...............................................8
3.6 Lid lock Y1 ........................................................................................................8
3.7 Imbalance switch S 2........................................................................................8
4Troubleshooting procedures.....................................................................................9
5Error messages......................................................................................................10
5.1 MAINS RESET................................................................................................10
5.2 Brief description ..............................................................................................10
5.3 Description and elimination of errors...............................................................11
5.4 Defects without Error indications.....................................................................16
6Settings and enquiries............................................................................................18
6.1 Setting the machine version............................................................................18
6.2 Enquiry the machine version...........................................................................19
6.3 Enquiry the programme versions ....................................................................20
6.4 Brake adjustment............................................................................................20
6.5 Lid lock control................................................................................................21
6.6 Imbalance switch-off .......................................................................................21
7Change mains input fuse........................................................................................22
8Functional check after a repair...............................................................................22
9Assembling and disassembling components..........................................................23
9.1 Motor M1 / speed sensor B3 / Rubber-metal bearing......................................24
9.2 Power board A1 ..............................................................................................24
9.3 Control panel A3 ............................................................................................24
9.4 Brake resistor R1 ............................................................................................25
9.5 Overtemperature fuse F3................................................................................25
9.6 Flat ribbon cable..............................................................................................25
9.7 Appliance plug with mains switch....................................................................25
9.8 Imbalance switch S2.......................................................................................25
9.9 Lid lock Y1 ......................................................................................................25

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10 Circuit diagrams ................................................................................................. 26
10.1 Circuit diagram and plug assignment..............................................................27
10.2 Signals and test results................................................................................... 28
10.2.1 Speed sensor B3 (Tacho)........................................................................ 28
10.2.2 Motor ....................................................................................................... 28
10.2.3 Brake resistor R1 and overtemperature fuse F3...................................... 29
10.2.4 Lid lock Y1...............................................................................................29
10.2.5 Imbalance switch..................................................................................... 30
10.2.6 Intermediate voltage on power board A1................................................. 30
11 Technical specification....................................................................................... 31
12 Skeleton construction of EBA 20S...................................................................... 32
13 Index ..................................................................................................................33

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1 Introduction
• Repairs must only be carried out by personnel authorised to do so by the
manufacturer.
Interventions and modifications at centrifuges, which have been conducted
by persons not authorized by the Andreas Hettich GmbH & Co. KG
company, are at their own risk and entail the loss off all guarantee and
liability claims. 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.
If no original spare parts or no original accessories are used, any guarantee
claim or liability claim against the Andreas Hettich GmbH & Co. KG
company ceases to exist.
• Information about the operation of the centrifuge please see operating instructions.
• We reserve all rights for these technical documents.
2 Symbol meanings
Symbol on the machine:
Attention, general hazard area.
Before using the centrifuge implicitly read the operating instructions and pay
attention to the safety relevant references!
Symbol in this document:
Attention, general hazard area.
This symbol refers to safety relevant warnings and indicates possibly
dangerous situations.
The non-adherence to these warnings can lead to material damage and injury
to personal.
Symbol in this document:
Warning! Danger for human lives by electric shock.
Symbol in this document:
This symbol refers to important circumstances.
Symbol on the machine and in this document:
Symbol for the separate collection of electric and electronic devices according
to the guideline 2002/96/EG (WEEE). The device belongs to Group 8 (medical
devices).
Applies in the countries of the European Union, as well as in Norway and
Switzerland.

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3 Description of the centrifuge
The EBA 20S is a microprocessor-controlled centrifuge which is comprised of the
following electrical components:
• Control panel
• Power board
• Motor
• Speed sensor (Tacho)
• Brake resistor with overtemperature fuse
• Lid lock system
• Imbalance switch
All electronic components are on mains, due to the DC-coupling
Netz / Mains
Verschluß / Lid lock
Deckelschalter
Lid switch
Uwuchtschalter
Imbalance switch
Bremswiderstand
Brake resistor
Leistungsteil
Power board
mit Mikroprozessorsteuerung
und Frequenzumrichterteil
With Micoprocessor control
and frequency control
Steuerteil LED / Control panel LED
EEPROMSchnittstelle / Interface
Motor
Drehzahlsensor (Tacho)
Speed sensor (tacho)

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3.1 Control panel A3
The control panel have only restricted control tasks, it disposes of the following
characteristics:
• Input panel for operation parameters
• Indication elements
• Transmission of the signals to the power board via the interface.
• Storing of centrifuge version
• Storing the machine version and the brake setting.
By means of the machine version the power board is informed which kind of
centrifuge has to be controlled. Then the power board takes the corresponding
values from the ROM.
e.g. Max. Speed
Acceleration and deceleration ramps
• Communication with the power board via TTL interface.
The power supply for the control panel is transmitted via the flat ribbon cable:
Pin 1 GND
Pin 4 +5V
3.2 Power board A1
The power board is an combination of:
• Control panel
• Voltage supply
• Frequency converter
The power board carries out the following tasks:
• Power supply 15 V, DC for imbalance switch
• Power supply 5 V, DC for control panel
• Generating the motor power supply.
(three-phase current with variable frequency and voltage)
Functional description: The mains supply is rectified, smoothened and chopped
into a pulse width pattern in three bridge elements with a
microprocessor.
• Slot for motor with integrated overtemperature switch
• Monitoring the motor current
• Evaluating the overtemperature switch in the motor
• Slot for imbalance switch
• Evaluating the imbalance switch
• Slot for brake resistor
• Triggering the brake resistor
• Slot for speed sensor
• Evaluating the speed sensor pulses (2 pulses per revolution)
• Slot for lid lock
• Triggering the lid lock magnet at standstill of the rotor
• Evaluating the message line lid lock open/closed
• Communication with the control panel via TTL interface
• Error evaluation

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3.3 Motor M1
• The motor is a three- phase asynchronous motor with two pairs of poles.
• The motor is protected against overheating by an overtemperature switch.
• The power board evaluates the overtemperature switch.
• The motor is controlled by the power board with a three-phase current with variable
frequency and voltage.
3.4 Speed sensor B3
• The speed sensor (speedometer) is located at the bottom of the motor.
• The speed signal (2 pulses per revolution) will be triggered by two magnets fixed at
the motor axle.
• The speed of the rotor is monitored and controlled by the power board.
3.5 Brake resistor R1 and Overtemperature fuse F3
• The braking copper which is integrated on the power board transfers the electrical
energy produced during braking, from a voltage of 380 V with the 230 V version and
203 V with the 120 V version, to the brake resistor in a controlled manner.
• An overtemperature fuse protects the brake resistor against overheating. When the
overtemperature fuse (F3) blows, the power board will be separated from the power
supply.
3.6 Lid lock Y1
• Opening of the lid lock is prevented by a latch. The lid lock can only be opened when
the relay REL 602 on the power board is energised. This occurs when the rotor is at
standstill, mains power is applied and the key is pressed. The solenoid is ener-
gized for three seconds and releases the latch.
• The centrifuge can only be started when the lid is closed. A microswitch on the lid
lock detects the position of the lid lock (open/closed) and report it to the power
board.
3.7 Imbalance switch S 2
• A switch detects any imbalance.
• Imbalance can only be detected in running mode (starting, centrifuging and braking).
• If any imbalance is detected, the drive is changed over to braking.

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4 Troubleshooting procedures
• Fuses in installation in which centrifuge is installed are intact.
• Mains input fuses of centrifuge are intact.
• Supply voltage present at (see circuit diagram):
− Connecting cable
− Appliance plug
− Mains switch
− Power board A1, plug S402L and S402N
• Look for the displayed error code in the chapter "Error messages".
• Remedy the error according to the instructions.
• Carry out a functional check after every repair and whenever a component is
replaced, see chapter "Functional check after a repair".

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5 Error messages
The error message will be indicated in the speed display of the front panel
e.g. :
RPM x 100
t
START
STOP
5.1 MAINS RESET
• Switch off the mains switch.
• Wait at least for 10 seconds and then switch on the mains switch again.
5.2 Brief description
Display. Fault Brief description Page
- 1 - Tacho error Tacho pulses break down during the run 11
- 2 - System reset Mains interrupt 11
- 3 - Imbalance Imbalance on the motor axis 11
- 4 - Communication Communication error 12
- 5 - Overload Fault in the motor or the motor control 12
- 6 - Overvoltage Mains is out of the tolerance 13
- 7 - Overspeed Overspeed detected 13
- 8 - Undervoltage Mains is out of the tolerance 13
- 9 - Overtemperature Overtemperature switch in the motor release 14
Versions Error No indication in the speed display
Wrong machine version setting 16
- c - Controller-Watchdog Fault in power board 14
- d - Lid lock error Fault in lid lock system 15
- E - Short circuit Short circuit in power board 15
- F - No Rotor code Wrong machine version 15

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5.3 Description and elimination of errors
– 1 – Tacho error
Error Tacho pulses break down during the run.
Error
consequence Drive switch off and brakes with the adjusted brake level.
Error cause • Speed sensor (tacho) defective
• Power board (A1) defective
• Loosen contact in plug S502
Measurement 1. A1 / S502 pin 2 (GND) to pin 3 (+UB)
2. Speed sensor plug S502 , pin 4 – pin 2 GND (2 pulses per
revolution). See also section 10.2
Error code reset Wait for a time duration of 120 sec. and after this perform a MAINS
RESET.
– 2 – System reset
Error Mains interrupt during a run
Error
consequence Drive switch off and brakes with the adjusted brake level.
Error cause • Power supply has failed
• Loosen contact in electrical connections
Error code reset 1. Wait for rotor standstill
2. Open the lid and press key
START
or
perform a MAINS RESET

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– 3 – Imbalance
Error Imbalance on motor axle
Error
consequence Drive switch off and brakes with the adjusted brake level
Error cause • Weight difference in rotor components.
• Imbalance switch is defective or not connected.
• Imbalance switch disadjusted (Adjustment see chapter
"Imbalance switch-off").
• Loose contact in cable or plug S503
• Power board (A1) is defective.
Measurement Plug of imbalance switch S503 Pin 1 to Pin 4
Switch is a opener. See also chapter 10.2.5.
Error code reset Open the lid after standstill
– 4 – Communication
Error Communication error between control board and power board
Error
consequence Drive switch off . No brake effective
Error cause • Loose contact in flat ribbon cable
• Control board (A3) defective
• Power board (A1) defective
Error code reset MAINS RESET after standstill.
If the MAINS RESET performed before standstill, the target speed
will be indicated in the display until standstill.
– 5 – Overload
Error Power board detects overload
Error
consequence Drive switches off. No brake effective
Error cause • Power board (A1) defective
• Motor defective (to low impedance or motor bearings are
defective)
Measurement Motor coil, see section 10.2.2.
Error code reset Perform a MAINS RESET after standstill

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– 6 – Overvoltage
Error Overvoltage in intermediate circuit.
This error normally only occur when the drive is being braked
Error
consequence Drive switches off. No brake effective
Error cause • Power board (A1) defective
• Brake resistor defective
Measurement Measure intermediate voltage, see section 0
Error code reset Perform a MAINS RESET after standstill.
– 7 – Overspeed
Error Overspeed. The speed measured by the speed sensor B3 is
250 RPM higher than the maximum speed of the rotor.
Error
consequence Drive switches off. No brake effective
Error cause • Speed sensor (B3) defective
• Power board (A1) defective
Measurement Check the speed sensor, see section 10.2.1
Error code reset Perform a MAINS RESET after standstill.
– 8 – Undervoltage
Error Mains voltage less than 20% as nominal voltage.
Error
consequence Drive switches off. No brake effective
Error cause • Mains voltage too less
• Power board (A1) defective
Measurement Check the mains voltage
Measure intermediate voltage, see chapter 0
Error code reset Perform a MAINS RESET after standstill.

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– 9 – Overtemperature
Error Overtemperature in the motor indicated.
Error
consequence Drive switches off. No brake effective
Error cause • Motor defective
• Power board (A1) defective
• Overtemperature switch in motor defective
• Loosen contact in plug S401 Pin 4 or 5
Measurement Remove plug S405 and measure between Pin 4 and 5 :
Switch open : ≈0 ΩOK
Switch closed: ∞Ωdefective
See also section 10.2.
Error code reset Perform a MAINS RESET after standstill.
– c – Controller-Watchdog
Error Watchdog in power board
Discrepancy in program procedure
Error
consequence Drive switches off. No brake effective
Error cause • Power board (A1) defective
Error code reset Perform a MAINS RESET after standstill.

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– d – Lid lock error
Error Lid lock is open during centrifugation.
Error
consequence Drive switches off. No brake effective
Error cause • Micro switch is defective.
• Power board (A1) defective.
• Loosen contact in Plug S404 Pin 5 and 6.
• Mechanical defect at the lid lock
• Emergency release active during run.
Measurement Remove plug S404 and measure between Pin 5 and 6 :
Lid closed: ≈0 Ω
Lid open: ∞Ω
See also section 10.2.
Error code reset Perform a MAINS RESET after standstill.
– E – Short circuit
Error Power board detects short circuit
Current consumption too high
Error
consequence Drive switches off. No brake effective
Error cause • Power board (A1) defective
Error code reset Perform a MAINS RESET after standstill.
– F – Rotor code
Error Wrong machine version is set.
Error
consequence Drive switches off after 15 sec. No brake effective
Error cause • Wrong machine version is set.
Error code reset Set the correct machine version, see chapter 6.1

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5.4 Defects without Error indications
No speed indication / Machine-Version-Error
Error After switching on the centrifuge the speed indicator extinguish and
in the time indicator appears the set machine version.
Error cause • Wrong machine version adjusted
Example for indication:
RPM x 100 t
START
STOP
Proceed as the following: 1. Set the machine version 3 (EBA 20S)
by using the and keys beneath
the time indicator.
2. Press the key
STOP
in order to store
the set machine version.
3. Perform a MAINS RESET.
The lid can not be opened
Error The lid can not be opened.
The rotation display indicates "Lid opened", but the lid is closed.
Error cause • Micro switch at lid lock is defective
• Loosen contact on plug S404 / Pin 5 and 6
• Power board A1 defective
• Jumper for lid lock control is not set on power board (A1), see
chapter 0
Measurement Remove plug S404 and measure between Pin 5 and 6:
Switch closed: ≈0 Ω
Switch opened: ∞Ω
See section 10.2.4.
Opening the lid Release the lid by using the emergency release.

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The lid can not be opened
Error The lid can not be opened
The rotation display indicates "Lid closed" and the lid is closed.
Error cause • Solenoid on lid lock is defective
• Loosen contact on plug S404 / Pin 1 and 3
• Power board A1 defective
• Jumper for lid lock control is set on power board (A1), see
chapter 0
Measurement Remove plug S404 and measure between Pin 1 and 3 :
Solenoid ok: ≈5.7 kΩ
Solenoid defective: ∞Ω
See also section 10.2.4.
Opening the lid Release the lid by using the emergency release.
No display
Error No power supply on control board, no display
Error
consequence No operation possible
Error cause • No mains supply
• Power board (A1) defective
• Control panel (A3) defective
• Flat ribbon cable to control panel (A3) defective
• Overtemperature fuse F3 defective
Measurement 1. Mains supply power board A1 S402L to S402N
2. Power board A1 S501 Pin 1 (GND) to S501 Pin 4 (+5V)
3. Control panel A3 S502 Pin 1 (GND) to S502 Pin 4 (+5V)
4. Overtemperature fuse F3. Remove plug S405 and measure
directly at both flat connections of the overtemperature fuse:
Fuse OK : ≈0 Ω
Fuse defective: ∞Ω. See also section 10.2.3.

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6 Settings and enquiries
RPM x 100 t
START
STOP
6.1 Setting the machine version
The machine version stored in the control panel must correspond to the centrifuge
model. Control panels supplied as spare part are set to machine version 4 (ROTOFIX
32).
After installing the control panel the machine version 3 (EBA 20S) must be set.
If a false machine version is set in the control panel so either after switching on the
centrifuge the set machine version will be displayed or after start of the centrifugation
run the error message " F –" will be displayed (see chapter "Error messages").
The machine version 3 (EBA 20S) must be set as follows:
All electronic components are on mains, due to the DC-coupling
1. Switch off the mains switch and disconnect the centrifuge from the mains
supply.
2. Remove the rotor.
3. Remove the fastening screws of the upper part of the centrifuge housing and
place the upper part carefully beside the centrifuge.
4. Short the two throughplatings on the rear side of the control panel with the short
circuit plug E1754 :
Short circuit plug
E1754
Short the two through-
platings with the short
circuit plug or a suitable
tool

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5. Put on carefully the upper centrifuge housing.
6. Connect the centrifuge to the mains and switch the centrifuge on.
7. Switch on the mains switch (position "I").
The set machine version will be
displayed, e.g.:
RPM x 100 t
START
STOP
8. Adjust the machine version 3 by using the and keys beneath the time
indicator.
9. Press the key
STOP
in order to store the set machine version.
10.Switch off the mains switch (position "0").
11.Disconnect the centrifuge from mains and remove the short circuit plug.
12.Put on the upper part of the centrifuge housing and fix it.
13.Switch on the mains switch (position "I").
6.2 Enquiry the machine version
1. Switch off the mains switch.
2. Keep the key beneath the speed indicator and the key pressed simultaneously.
3. Switch on the mains switch and release the keys again.
The speed indicator shows the machine version and the time indicator shows the set
brake step: e.g.:
RPM x 100 t
START
STOP
RPM x 100 t
START
STOP
If the machine version and brake step are not displayed, press the key under the
speed indicator until they are displayed.
4. To exit the machine version display press the key
STOP
or perform a MAINS-
RESET.

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6.3 Enquiry the programme versions
1. Switch off the mains switch.
2. Keep the key beneath the speed indicator and the key pressed simultaneously.
3. Switch on the mains switch and release the keys again.
4. Press the key beneath the speed indicator so often until the programme version of
the control panel (e.g. b1.12) is displayed.
RPM x 100 t
START
STOP
5. Press the key beneath the speed indicator again.
The programme version of the power board (e.g. F1.03) is displayed.
RPM x 100 t
START
STOP
6. To exit the machine version display press the key
STOP
or perform a MAINS-
RESET.
6.4 Brake adjustment
1. Switch off the mains switch.
2. Keep the key beneath the speed indicator and the key pressed simultaneously.
3. Switch on the mains switch and release the keys again.
The speed indicator shows the machine version and the time indicator shows the set
brake step: e.g.:
RPM x 100 t
START
STOP
RPM x 100 t
START
STOP
If the machine version and brake step are not displayed, press the key under the
speed indicator until they are displayed.
4. Set the desired brake step with the keys beneath the time indicator.
Step 1 = short run-down time, Step 0 = long run-down time.
For run-down times, see chapter "Anhang/Appendix, Rotor und Zubehör/Rotor and
accessories" in the operating instructions.
5. Press the key
STOP
to save the setting.