Hettich ROTOFIX 32 Setup guide

02.06 AR087GB
Andreas Hettich GmbH & Co. KG •Föhrenstraße 12 •D-78532 Tuttlingen •Germany
Phone: [phone] •Fax: [phone] •Internet: www.hettichlab.com •e-mail: [email protected], [email protected]
Repair instructions
ROTOFIX 32

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No part of this publication may be reproduced without the written prior permission of the
copyright owner.
© 1999 by Andreas Hettich GmbH & Co. KG,D-78532 Tuttlingen / Germany.
Technical alterations reserved!

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Contents
1. Introduction ..............................................................................................................5
2. Description of the centrifuge.....................................................................................6
2.1 Control panel A3 ...............................................................................................7
2.2 Power board A1 ................................................................................................7
2.3 Motor M1...........................................................................................................8
2.4 Speed sensor B3...............................................................................................8
2.5 Brake resistor (R1) and overtemperature fuse (F3)...........................................8
2.6 Lid lock Y1 ........................................................................................................8
2.7 Imbalance switch S 2 ........................................................................................8
3. Troubleshooting procedures.....................................................................................9
4. Error messages......................................................................................................10
4.1 MAINS RESET................................................................................................10
4.2 Brief description ..............................................................................................10
4.3 Description and elimination of errors...............................................................11
4.4 Defects without Error indications.....................................................................16
5. Settings and enquiries............................................................................................18
5.1 Setting the machine version............................................................................18
5.2 Enquiry the machine version...........................................................................18
5.3 Enquiry the programme versions ....................................................................19
5.4 Brake setting ...................................................................................................19
5.5 Lid lock control ................................................................................................20
5.6 Imbalance switch-off .......................................................................................20
6. Functional check after a repair ...............................................................................21
7. Speedometer-code-position of the rotor.................................................................22
8. Assembling and disassembling components..........................................................23
8.1 Speed sensor (Tacho) B3 ...............................................................................24
8.2 Motor M1 / Rubber-metal bearing ...................................................................24
8.3 Power board A1 ..............................................................................................24
8.4 Control panel (A3)........................................................................................... 24
8.5 Brake resistor (BR) R1 .................................................................................... 24
8.6 Overtemperature fuse F3 ................................................................................25
8.7 Flat ribbon cable..............................................................................................25
8.8 Appliance plug with mains switch....................................................................25
8.9 Exchange mains fuse......................................................................................25
8.10 Imbalance switch (S2).....................................................................................25
8.11 Lid lock Y1 ......................................................................................................25

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9. Circuit diagrams..................................................................................................... 26
9.1 Circuit diagram and plug assignment.............................................................. 27
9.2 Signals and test results................................................................................... 28
9.2.1 Speed sensor (Tacho) B3........................................................................ 28
9.2.2 Motor ....................................................................................................... 28
9.2.3 Brake resistor R1 and overtemperature fuse F3...................................... 29
9.2.4 Lid lock Y1............................................................................................... 29
9.2.5 Imbalance switch ..................................................................................... 30
9.2.6 Intermediate voltage on power board A1................................................. 30
10. Technical data.................................................................................................... 31
11. Skeleton construction of ROTOFIX 32 ............................................................... 32
12. Index .................................................................................................................. 33

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1 Introduction
• This repair instruction is only intended for specialized staff authorized by HETTICH.
Interventions and modifications at centrifuges, which have been conducted
by persons not authorized by HETTICH, 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 HETTICH expire.
• The aim of these repair instructions is to enable any errors to be located and
eliminated quickly.
There should be no interventions at, or replacement of components on the
individual electronics boards. Experience shows that if an intervention is not
performed in accordance with regulations, or if a component is installed
whose specification is not identical to that of the original component, then the
error (defect) which has occurred will be compounded by further damage. In
such an event any guarantee claim or liability claim against the HETTICH
ceases to exist.
Any electronics boards which are not repaired in accordance with the
regulations cannot be acknowledged as being replacement spare parts.
• Information about the operation of the centrifuge please see operating instructions.
• We reserve all rights for these technical documents.
• Technical alterations reserved.

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2 Description of the centrifuge
The ROTOFIX 32 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
Deckelschalter
Lid switch
Uwuchtschalter
Imbalance switch
Bremswiderstand
Brake resistor
Leistungteil
Power board
mit Mikroprozessorsteuerung
und Frequenzumrichterteil
W
ith Micoprocessor control
and frequency control
Steuerteil LED / Control panel LED
EEPROM
Schnittstelle / Interface
Motor
Drehzahlsensor (Tacho)
Speed sensor (tacho)

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2.1 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 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
2.2 Power board A1
The power board is a combination of:
• Control panel
• Voltage supply
• Frequency converter
The power board carries out the following tasks:
• Power supply 15 V, DC for imbalance switch and speed sensor
• 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 (6 per revolution)
• Evaluating the rotor code information
• Slot for lid lock
• Triggering the lid lock magnet at stand still 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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2.3 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.
2.4 Speed sensor B3
• The speed sensor (speedometer) which is screwed onto the motor receives
− the rotor code information and
− the speed information (6 pulses per revolution)
from the magnets of the tacho ring attached to the rotor.
• The speed of the rotor is monitored and controlled by the power board
2.5 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.
2.6 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 and mains power is applied. The solenoid is energized 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.
2.7 Imbalance switch S 2
• A switch (break contact) 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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3 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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4 Error messages
The error message will be indicated in the speed display of the front panel.
e.g. :
RPM x 100
START
STOP
t
Fehlermeldung / Error indication
4.1 MAINS RESET
• Switch off the mains switch.
• Wait at least for 10 seconds and then switch on the mains switch again.
4.2 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 toleranc 12
- 8 - Undervoltage Mains is out of the toleranz 13
- 9 - overtemperature Overtemperature switch in the motor release 13
Versions Error No indication in the speed display
Machine version misadjusted.
16
- c - Controller-Watchdog Fault in power board 14
- d - Lid lock error Fault in lid lock system 14
- E - Short circuit Short circuit in power board 14
- F - Rotor code No rotor code signals 15
rot… New rotor identified New rotor was installed 15

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4.3 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 (pulses: 0V, 15V,
0V, 15V etc. / 6 pulses per revolution). See also section 9.2
Error code reset Wait for a time duration of 120 sec. 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 stand still
2. Open the lid and press key
START
or
perform a MAINS RESET
– 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.
• Supporting lugs not greased.
• 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 S503 Pin 1 to Pin 4 of imbalance switch
Switch is a opener. See also chapter "9.2.5".
Error code reset Open the lid after standstill

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– 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 stand still.
If the MAINS RESET performed before stand still, 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 Measure motor coil, see chapter 9.2.
Error code reset Perform a MAINS RESET after standstill
– 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 chapter 9.2.6
Error code reset Perform a MAINS RESET after standstill.

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– 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 9.2.6
Error code reset Perform a MAINS RESET after standstill.
– 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 S401 and measure between Pin 4 and 5 :
Switch closed: ≈0 ΩOK
Switch open: ∞Ωdefective
See also chapter 9.2.
Error code reset Perform a MAINS RESET after standstill.

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– 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.
– d – Lid lock error
Error Lid lock is open during centrifugation.
Error
consequence
Drive switches off. No brake effective
Error cause • Micro switch on lid lock 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 9.2.
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.

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- F - Rotor code
Error No rotor code after start-up.
Error
consequence
Drive switches off after 15 sec. No brake effective
Error cause • Start-up took place without the rotor.
• Motor is defective.
• Power board (A1) defective Speed sensor (speedometer)
defective, or loose contact on plug.
Measurement 1. A1 / S502 pin 2 (GND) to pin 3 (+UB)
2. Speed sensor plug S502 , pin 4 – pin 2 GND (pulses: 0V, 15V,
0V, 15V etc. / 6 pulses per revolution). See also section 9.2
Error code reset Perform a MAINS RESET after standstill.
rot... – New rotor identified
Each time a centrifuging run is started, the centrifuge recognises the rotor code of the
installed rotor with the help of a sensor. This means that the nominal speed of the
installed rotor cannot be exceeded.
After the identification of a newly installed rotor the drive will cut off and its rotor code
"rot ..." will be displayed. Example: rot 3 = rotor code 3.
Press the
START
key.
If the speed rating of the newly installed rotor is lower than the last speed entered, the
speed rating of the newly installed rotor will be displayed.
If the speed rating of the newly installed rotor is higher than the last speed entered, the
last speed entered will be displayed.
Press the
START
key to start the centrifugation run.

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4.4 Defects without Error indications
No speed indication / Machine-Version-Error
Error The centrifuge stops after few seconds and the speed display
extinguished and in the time display appears the set machine
version.
Error cause • Wrong machine version adjusted
Example for indication:
RPM x 100 t
Maschinenversion / Machine version
START
STOP
Proceed as the following: 1. Adjust the correct machine version by
using the and arrow keys in the
time area.
ROTOFIX 32 = 4
MIKRO 20 = 2
EBA 20 = 1
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 set on power board (A1), see
chapter 5.5
Measurement Remove plug S404 and measure between Pin 5 and 6:
Switch closed: ≈0 Ω
Switch opened: ∞Ω
See also section 9.2.4.
Error code reset 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 5.5
Measurement Remove Plug S404 and measure between Pin 1 and 3:
Solenoid ok: ≈5.7 kΩ
Solenoid defective: ∞Ω
See also section 9.2.4.
Error code reset 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 9.2.3.

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5 Settings and enquiries
Rotation area
RPM x 100
START
STOP
t
Speed area Time area Keypad
5.1 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 already set to machine version 4
(ROTOFIX 32).
If another machine version than 4 is set in the control panel, the set machine version will
appear in the display after switching on the centrifuge ROTOFIX 32.
The machine version 4 must be set as follows:
1. Adjust the machine version 4 by
using the and arrow keys in
the time area.
RPM x 100 t
Maschinenversion / Machine version
START
STOP
2. Press the key
STOP
in order to store the set machine version.
5.2 Enquiry the machine version
1. Switch off the mains switch.
2. Simultaneously press the pulse key and the arrow key in the speed area.
Switch on the mains switch and release the keys again.
3. If necessary press the key so often until the machine version appears in the
speed area and the brake setting appears in the time area.
RPM x 100
START
STOP
t
Speed area Time area
RPM x 100
START
STOP
t
Speed area Time area
4. To exit the machine version display press the key
STOP
or perform a MAINS-
RESET.

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5.3 Enquiry the programme versions
1. Switch off the mains switch.
2. Simultaneously press the pulse key and the arrow key in the speed area.
Switch on the mains switch and release the keys again.
3. Press the key in the speed area so often until the programme version of the
control panel (e.g. b1.12) is displayed.
RPM x 100
START
STOP
t
Speed area Time area
4. Press the key in the speed area again.
The programme version of the power board (e.g. F1.03) is displayed.
RPM x 100
START
STOP
t
Speed area Time area
5. To exit the machine version display press the key
STOP
or perform a MAINS-
RESET.
5.4 Brake setting
With this centrifuge, the braking effect can be set to normal or low.
This can be set before a run, as follows:
1. Switch off the mains switch.
2. Simultaneously press the pulse key and the arrow key in the speed area.
Switch on the mains switch and release the keys again.
3. If necessary press the key so often until the machine version appears in the
speed area and the brake setting appears in the time area.
RPM x 100
START
STOP
t
Speed area Time area
RPM x 100
START
STOP
t
Speed area Time area
Normal braking effect “1” Low braking effect “0”
4. Set the required value, “1” or “0”, in the time area with the and arrow keys.
For brake times see operating instructions chapter " Anhang/Appendix, Rotoren und
Zubehör/Rotors and accessories ".
5. Confirm the set value with the
STOP
key.

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5.5 Lid lock control
With the centrifuge ROTOFIX 32 the solenoid of the lid lock is energized automatically
when the rotor is at standstill.
After the lid is opened the solenoid will drop out again.
With this kind of lid lock control, the jumper for the lid lock control on the power board
(see below) may not be plugged.
Jumper für Verschlußansteuerung
Jum
p
er for lid lock control
Leistungsteil
Power board
Unwuchtschalter
Imbalance switch
Deckelverriegelun
g
Lid lock
Motor Übertemp. -schalter
Overtemp. switch
Übertemp.-sicherung
Overtemp. fuse
Bremswiderstand
Brake resistor
Tach o
Speedometer
S402L
S402N
L1
N
S402P
A 1
S404
S503
S501
2341
S405
12 34
S502
S401
UR US UT
12345
5.6 Imbalance switch-off
The permissible imbalance is specified for rotor 1628 by the indication of the difference
in weight of opposite rotor positions.
When having a difference in weight within the range of 4g to 8g during run-up, the drive
has to switch off before reaching 1400 RPM.
The imbalance switch-off is adjusted by changing the distance of the imbalance switch.
With a test run with the indicated differences in weight the imbalance switch-off will be
checked.
Adjusting the imbalance switch:
• Loosen both screws at the angle bracket of the imbalance switch on the outer part of
the housing floor until you can shift it.
• Set the permissible imbalance by shifting the angle bracket.
• Tighten both screws at the angle bracket of the imbalance switch again.
• Check the imbalance switch-off with a test run.