Hettich EBA 270 Setup guide

2011 Andreas Hettich GmbH & Co. KG AR2300EN
EBA 270
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
© 2011 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!
AR2300EN / 2011

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Contents
1Introduction.....................................................................................................................5
2Symbol meanings ...........................................................................................................5
3Description of the centrifuge...........................................................................................6
3.1 Control panel (A2) ...................................................................................................6
3.2 Electronics (A1).......................................................................................................7
3.3 Motor (M1)...............................................................................................................7
3.4 Speed sensor (B1)...................................................................................................7
3.5 Lid lock (A4).............................................................................................................8
3.6 Imbalance switch (S1).............................................................................................8
4Troubleshooting procedures...........................................................................................8
5Error messages...............................................................................................................9
5.1 Perform a MAINS RESET .......................................................................................9
5.2 Brief description.......................................................................................................9
5.3 Description and elimination of errors.....................................................................10
5.4 Defects without Error indications...........................................................................14
6Settings and enquiries ..................................................................................................16
6.1 Setting the machine version..................................................................................16
6.2 Enquiry the machine version.................................................................................16
6.3 Enquiry the programme versions ..........................................................................17
6.4 Setting the brake step............................................................................................17
6.5 Imbalance switch-off..............................................................................................18
7Functional check after a repair......................................................................................19
8General arrangement of the components.....................................................................20
9Assembling and disassembling components................................................................22
9.1 Removing the centrifuge chamber ........................................................................22
9.2 Removing the upper part of the centrifuge housing..............................................22
9.3 Motor (M1) / Rubber-metal bearings / Speed sensor (B1)....................................23
9.4 Lid lock (A4)...........................................................................................................23
9.5 Electronics (A1).....................................................................................................24
9.6 Control panel (A2) .................................................................................................24
9.7 Flat ribbon cable (W1)...........................................................................................24
9.8 Appliance plug (A3)...............................................................................................24
9.9 Imbalance switch (S1)...........................................................................................25
9.10 Leg spring..............................................................................................................25

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10 Technical documents.................................................................................................26
10.1 Block diagram of the control..................................................................................26
10.2 Connecting diagrams.............................................................................................27
10.2.1 Abbreviations of the cable colours.................................................................27
10.2.2 Connecting diagram EBA 270........................................................................28
10.3 Technical specifications.........................................................................................29

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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 device:
Attention, general hazard area.
Before using the device, make sure you read the operating instructions and
observe the safety information!
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
This microprocessor controlled centrifuge mainly consists of the following components:
• Control panel (A2)
• Electronics (A1)
• Motor (M1) with speed sensor (B1)
• Lid lock system (A4)
• Imbalance switch (S1)
All electronic components are on mains, due to the DC-coupling.
3.1 Control panel (A2)
The control panel (A2) have only restricted control tasks, it disposes of the following
characteristics:
• Keys for input of the operation parameters
• Indication elements
• Transmission of the signals to the electronics (A1) via the interface.
• Storing the machine version and the brake setting.
By means of the machine version the electronics (A1) is informed which kind of
centrifuge has to be controlled. Then the electronics (A1) takes the corresponding
values from the ROM.
e.g. Max. Speed
Acceleration and deceleration ramps
• Communication with the electronics (A1) via TTL interface
The power supply for the control panel (A2) is transmitted from the electronics (A1) via
the flat ribbon cable:
Pin 1 GND
Pin 4 +5V

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3.2 Electronics (A1)
The electronics (A1) is a combination of:
• Control panel
• Voltage supply
• Frequency converter
The electronics (A1) carries out the following tasks:
• Power supply 15 V, DC for imbalance switch (S1) and speed sensor (B1)
• Power supply 5 V, DC for control panel (A2)
• 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 the motor (M1) with integrated overtemperature switches
• Monitoring the motor current
• Evaluating the overtemperature switches in the motor (M1)
• Slot for imbalance switch (S1)
• Evaluating the imbalance switch (S1)
• Slot for speed sensor (B1)
• Evaluating the speed sensor pulses (1 pulse per revolution)
• Slot for lid lock (A4)
• Evaluating the message line lid lock open/closed
• Communication with the control panel (A2) via TTL interface
• Error evaluation
• Status indication with a green LED:
Standby, centrifugation run: The green LED lights up
Case of error: The green LED flashes with specific errors
3.3 Motor (M1)
• The motor is a 2-pole three-phase asynchronous motor (1 pair of poles).
• The motor is protected against overheating by three overtemperature switches.
• The electronics (A1) evaluates the overtemperature switches.
• The motor is controlled by the electronics (A1) with a three-phase current with
variable frequency and voltage.
3.4 Speed sensor (B1)
• The speed sensor (B1, speedometer) is screwed to the bottom of the motor. The
speed signal (1 pulse per revolution) will be triggered by a magnet located in the
motor axle.
• The speed of the rotor is monitored and controlled by the electronics (A1).

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3.5 Lid lock (A4)
• The lid can be opened only if the electronics (A1) has detected rotor standstill.
• After pressing the key
OPEN
the magnet at the lid lock is energized for a short time
and the lid opens.
• The centrifugation run 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
electronics (A1).
3.6 Imbalance switch (S1)
• A switch (break contact) detects any imbalance.
• Imbalance can only be detected in running mode (starting, centrifuging and braking).
• If impermissible imbalance is detected, the drive switches off and the rotor slows
down braked until it stops.
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 connecting diagram):
− Connecting cable
− Appliance plug/mains switch
− Electronics (A1), plug S102L and S102N
• 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 messages will be indicated in the speed display of the control panel.
e.g. :
RPM x 100 t
PULSE START
STOPOPEN
5.1 Perform a MAINS RESET
• Switch off the mains switch (switch position "0").
• Wait at least 10 seconds and then switch on the mains switch again (switch
position "Ι").
5.2 Brief description
Display. Fault Brief description Page
- 1 - Tacho error Tacho pulses break down during the run 10
- 2 - Mains interrupt Mains interrupt 10
- 3 - Imbalance Imbalance on the motor axle 11
- 4 - Communication Communication error 11
- 5 - Overload Fault in the motor or the motor control 11
- 6 - Overvoltage Mains is out of the tolerance 12
- 7 - Overspeed Overspeed detected 12
- 8 - Undervoltage Mains is out of the tolerance 12
- 9 - Overtemperature Overtemperature in the motor 13
Versions Error No speed indication
False machine version adjusted 14
- b - Speed error Speed too low 13
- c - Controller-Watchdog Fault in electronics (A1) 13
- d - Lid lock error Fault in lid lock system 14
- E - Short circuit Short circuit in electronics (A1) 14

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5.3 Description and elimination of errors
– 1 – Tacho error
Speedometer pulses break down during the centrifugation run.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Wait 2 minutes until the safety time is passed and the rotation
indicator has stopped to turn. Then perform a MAINS RESET.
• Speed sensor (B1) is defective or has loose contact on plug.
Measure supply voltage on plug S602 / Electronics (A1)
pin 1 – pin 3 (+15 VDC).
Measure speedometer pulses on plug S602 / Electronics (A1) pin
1 – pin 2 (signal, 1 pulse per revolution).
• Electronics (A1) is defective.
– 2 – Mains interrupt Mains interrupt during the centrifugation run.
During the interruption of the mains supply the rotor slows down
without braking until it stops.
After the interruption of the mains supply the rotor slows down
braked until it stops.
After the rotor is at standstill the lid can be opened.
No further user operation possible.
• Reset error code:
Open the lid and press the
START
key or perform a MAINS
RESET.
• Power failure.
• Loose contact in the mains cable or in the appliance plug
(A3) or in the internal electrical wiring.
• Electronics (A1) is defective.

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– 3 – Imbalance Imbalance on the motor axle.
The rotor slows down braked until it stops.
After the rotor is at standstill the lid can be opened.
• Reset error code:
Open the lid or perform a MAINS RESET.
• Weight difference in rotor components.
• Imbalance switch (S1) disadjusted (Adjustment see chapter 6.5,
pg. 18).
• Imbalance switch (S1) is defective or not connected.
Remove plug S603 and measure between pin 1 and pin 4 (switch
is a break contact).
Switch closed: ≈0 Ω
Switch opened: ∞Ω
• Electronics (A1) is defective.
– 4 – Communication
Communication error between control panel (A2) and electronics (A1).
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Loose contact in flat ribbon cable (W1).
• Control board (A2) is defective.
• Electronics (A1) is defective.
– 5 – Overload Electronics detects overload.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Motor is defective (Ball bearings of the motor defective or
resistance of the motor coils too low).
Check the ball bearings of the motor for easy movement.
Remove plug S101 and check at the plug pin1, pin 2, pin 3 the
resistance (≈35,2 Ω) of the motor coils.
• Electronics (A1) is defective.

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– 6 – Overvoltage
Overvoltage
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Mains voltage is too high. Admissible mains voltage see chapter
10.3, pg. 29.
• Electronics (A1) is defective.
– 7 – Overspeed Overspeed. The speed measured by the speed sensor (B1) is
250 RPM higher than the maximum speed of the rotor.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Speed sensor (B1) defective.
Measure supply voltage on plug S602 / Electronics (A1)
pin 1 – pin 3 (+15 VDC).
Measure speedometer pulses on plug S602 / Electronics (A1) pin 1
– pin 2 (signal, 1 pulse per revolution).
• Electronics (A1) is defective.
– 8 – Undervoltage
Undervoltage
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Mains voltage is too less. Admissible mains voltage see chapter
10.3, pg. 29.
• Electronics (A1) is defective.

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– 9 – Overtemperature
Overtemperature in the motor. Temperature > 125°C / 257°F.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Motor is defective.
Temperature in the motor is higher than 125°C / 257°F.
• Overtemperature switches in the motor are defective.
Remove plug S101 and measure at the plug pin 7 – pin 9 :
Switch closed: ≈0 Ω
Switch open: ∞Ω
• Electronics (A1) is defective.
– b – Speed error
The set speed is not reached.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Speed sensor (B1) is defective or has loose contact on plug.
Measure supply voltage on plug S602 / Electronics (A1)
pin 1 – pin 3 (+15 VDC).
Measure speedometer pulses on plug S602 / Electronics (A1) pin
1 – pin 2 (signal, 1 pulse per revolution).
• Motor is defective (Ball bearings of the motor defective or
resistance of the motor coils too low).
Check the ball bearings of the motor for easy movement.
Remove plug S101 and check at the plug pin1, pin 2, pin 3 the
resistance (≈35,2 Ω) of the motor coils.
• Electronics (A1) is defective.
– c – Controller-Watchdog
Watchdog in electronics.
Discrepancy in program procedure.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Electronics (A1) is defective.

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– d – Lid lock error
The microswitch at the lid lock has opened during the centrifugation
run.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• An emergency unlocking was performed during the centrifugation
run.
• Microswitch at the lid lock (A4) is defective or has loose contact on
plug.
Remove plug S104 and measure at the plug pin 7 – pin 14:
Lid closed: ≈0 Ω
Lid open: ∞Ω
• Mechanical defect at the lid lock.
• Electronics (A1) is defective.
– E – Short circuit
Current consumption of the motor is too high.
The rotor slows down without braking until it stops.
No further user operation possible.
• Reset error code:
Perform a MAINS RESET.
• Electronics (A1) is defective.
5.4 Defects without Error indications
No speed indication / Machine-Version-Error
Wrong machine version adjusted.
After switching on the centrifuge the speed indicator extinguish and in
the time indicator appears the set machine version.
• Set the machine version C as described in chapter 6.1, pg. 16.

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The lid can not be opened
The lid can not be opened.
With the closed lid the symbol " " (lid open) illuminates in the rotation
indicator .
• Open the lid by using the emergency release.
• Microswitch at the lid lock (A4) is defective or has loose contact on
plug.
Remove plug S104 and measure at the plug pin 7 – pin 14:
Lid closed: ≈0 Ω
Lid open: ∞Ω
• Electronics (A1) is defective.
The lid can not be opened
The lid can not be opened.
With the closed lid the symbol " " (lid closed) illuminates in the
rotation indicator
• Open the lid by using the emergency release.
• Magnet at the lid lock (A4) is defective or has loose contact.
Remove plug S104 and measure at the plug pin 8 – pin 10:
Magnet faultless: ≈1 KΩ.
• Electronics (A1) is defective.
No display No mains supply on control panel.
No operation possible.
• No mains supply. Check the mains supply.
• Mains input fuses F1, F2 are defective. Check the mains
input fuses.
• Electronics (A1) is defective.
Measure the mains voltage on electronics (A1), plug S102L –
S102N.
If the green LED on the electronics (A1) lights up, the supply
voltage for the control panel at plug S601 / Electronics (A1)
pin 1 (GND) – pin 4 (+5V) will be present.
• Control panel (A2) is defective.
• Flat ribbon cable to control panel (A2) is defective.

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6 Settings and enquiries
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 not yet set to machine version C (EBA
270).
It is important to set the machine version C.
The machine version C (EBA 270) must be set as follows:
1. Set the machine version C by
using the and keys beneath
the time indicator.
RPM x 100 t
PULSE START
STOPOPEN
2. Press the key
STOP
in order to store the set machine version.
3. Switch off the mains switch. Wait at least 10 seconds and then switch on the
mains switch again.
6.2 Enquiry the machine version
1. Switch off the mains switch.
2. Keep the key beneath the speed indicator and the key
PULSE
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 RPM x 100t t
PULSE PULSESTART START
STOP STOPOPEN OPEN
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
.

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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
PULSE
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. b1.41) is displayed.
RPM x 100 t
PULSE START
STOPOPEN
5. Press the key beneath the speed indicator again.
The programme version of the electronics (e.g. E1.01) is displayed.
RPM x 100 t
PULSE START
STOPOPEN
6. To exit the machine version display press the key
STOP
.
6.4 Setting the brake step
1. Switch off the mains switch.
2. Keep the key beneath the speed indicator and the key
PULSE
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 RPM x 100t t
PULSE PULSESTART START
STOP STOPOPEN OPEN
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, Rotoren und Zubehör/Rotors
and accessories".
5. Press the key
STOP
to save the setting.

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6.5 Imbalance switch-off
The imbalance switch-off is specified by the indication of the difference in weight of
opposite rotor positions.
When having a difference in weight within the range of 4 g to 6 g during run-up, the
drive has to switch off before reaching a speed of 2000 RPM.
The imbalance switch-off is adjusted by changing the distance of the imbalance switch.
By a test run with empty rotor, and the specified weight in one rotor place the imbalance
switch-off is checked.
Adjusting the imbalance switch:
a
Fig. 1
• Loosen both screws (Fig. 1, a) at the angle bracket of
the imbalance switch on the rear side of the device until
you can shift the angle bracket.
• Set the permissible imbalance by shifting the angle
bracket.
Shift the angle bracket downwards: Switch-off takes
place at a higher weight.
Shift the angle bracket upwards: Switch-off takes place
at a lower weight.
• Tighten both screws (Fig. 1, a) at the angle bracket of
the imbalance switch again.
• Check the imbalance switch-off with a test run.

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7 Functional check after a repair
After a repair a functional check of the unit must be carried out. For functional check a
test run with the loaded rotor must be performed.
During the test run the followings must be checked:
• Function of the keys and the display.
• Run-up and slow-down time, max. speed of the rotor. Values see operating
instructions chapter "Anhang/Appendix, Rotoren und Zubehör/Rotors and
accessories".
• Sample temperature. Values see operating instructions chapter "Anhang/Appendix,
Rotoren und Zubehör/Rotors and accessories".
• Imbalance switch-off. Values see chapter "Imbalance switch-off".
• Current consumption. Values see chapter "Technical specification".
After the test run a safety test must be carried out. Check the following values:
• Insulation resistance > 2 MΩ
• Protective conductor resistance < 0.2 Ω
• Leakage current < 3.5 mA *
* limit according to EN 61010-1
A laboratory centrifuge do not belong to those medical appliances which may be tested
according to the regulation IEC 60601-1 or corresponding national medical electronic
standards. Laboratory centrifuges are classified as laboratory equipment.
The regulations applying to laboratory equipment are IEC 61010-1 or European
standard EN 61010-1.

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8 General arrangement of the components
Item Designation
1 Lid
2 Housing
3 Leg spring
4 Sealing ring
5 Centrifuge chamber
6 Motor cover
7 Motor
8 Speed sensor
9 Rubber-metal bearing
10 Upper anti-twist device
11 Lower anti-twist device
12 Imbalance switch
13 Lid lock complete
14 Appliance plug (without fuse holder)
15 Fuse holder
16 Fuse
17 Electronics (230V version)
18 Electronics (120V version)
19 Control panel
20 Flat ribbon cable (4-pole)
21 Cover foil
22 Rubber foot