Hettich UNIVERSAL 320 R Setup guide

06.08 Andreas Hettich GmbH & Co. KG AR1401EN

Repair instructions

UNIVERSAL 320

UNIVERSAL 320 R

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Andreas Hettich GmbH & Co. KG

Föhrenstraße 12, D-78532 Tuttlingen / Germany

Phone (07461) 705-0

Fax (07461) 705-125

[email protected], [email protected]

www.hettichlab.com

written permission of the copyright owner.

Modifications reserved!

AR1401EN / 06.08

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Contents

1Introduction ..............................................................................................................5

2Symbol meanings.....................................................................................................5

3Description of the centrifuge.....................................................................................6

3.1 Operating panel (A2).........................................................................................6

3.2 Electronics U320 resp. U320R (A1) ..................................................................6

3.3 Special features ................................................................................................7

3.4 Brake resistor (R1) ............................................................................................ 7

3.5 Motor (M1) / tacho system (B4, B2.1) ...............................................................7

3.6 Imbalance sensor (B2.2) ...................................................................................8

3.7 Motor-driven lid lock (A3) ..................................................................................8

3.8 Cooling system..................................................................................................8

3.9 Safety devices................................................................................................... 9

4Troubleshooting procedures.....................................................................................9

5Error messages......................................................................................................10

5.1 MAINS RESET................................................................................................10

5.2 Brief description ..............................................................................................10

5.3 Description and elimination of errors...............................................................12

6Settings and interrogations.....................................................................................23

6.1 Summary of the possible settings and interrogations...................................... 23

6.2 Acoustic signal ................................................................................................24

6.3 Operating hours ..............................................................................................25

6.4 Blank the machine type in the display .............................................................26

6.5 Automatic repetition of the centrifugation run..................................................27

6.6 Function test ...................................................................................................28

6.7 Logging the occurred faults............................................................................. 32

6.8 Checking the motor slippage........................................................................... 34

6.9 Parameter interrogation .................................................................................. 35

6.10 Display of the frequency converter temperature and the measured speeds ... 36

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6.11 Imbalance values............................................................................................ 37

6.11.1 Setting the imbalance switch-off .............................................................. 37

6.11.2 Imbalance values of the last centrifugation run........................................ 39

6.11.3 Imbalance values during centrifugation run ............................................. 40

6.12 Cooling parameters ........................................................................................ 41

6.12.1 Switch-on delay of the Standby cooling................................................... 41

6.12.2 Pre-cooling speed.................................................................................... 42

6.12.3 Temperature values during standstill....................................................... 43

6.12.4 Temperature values during centrifugation run ......................................... 44

6.12.5 Compensate the temperature sensors .................................................... 45

6.13 Initialise and read out the EEPROM ............................................................... 47

6.14 Activate the functions for the operation with an external

refrigerating/heating circulator in the programme ........................................... 49

6.15 Setting the display contrast............................................................................. 50

7Functional check after a repair............................................................................... 51

8General arrangement of the components .............................................................. 52

9Technical documents............................................................................................. 57

9.1 Tachometer code configuration of the rotors .................................................. 57

9.2 Cooling diagram.............................................................................................. 58

9.3 Connecting diagram........................................................................................ 59

9.3.1 Abbreviations of the cable colours........................................................... 59

9.3.2 Connecting diagram UNIVERSAL 320 / 320 R........................................ 60

9.3.3 Connecting diagram UNIVERSAL 320 R Heating/cooling ....................... 62

9.4 Technical specifications.................................................................................. 64

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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 the repair instructions:

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 the repair instructions:

This symbol refers to important circumstances.

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3 Description of the centrifuge

These microprocessor controlled centrifuges mainly consist of the following electrical

components:

• Operating panel (A2)

• Electronics U320 (A1) resp. Electronics U320R (A1)

• Motor with 2 speed sensors (B2.1, B4) and imbalance sensor (B2.2)

• Brake resistor (R1)

• Motor-driven lid lock (A3)

• Cooling system

3.1 Operating panel (A2)

The buttons, the LCD display, the status LEDs and the acoustic beeper are located on

the operating panel.

The operating panel is connected with the Electronics U320 (A1) via a 16-pole flat

ribbon cable.

3.2 Electronics U320 resp. U320R (A1)

There are 2 microprocessors on the Electronics U320 . Both processors (control- and

drive-processor) are communicating internal via a serial interface.

The control-processor carries out the following tasks:

• Reading in the buttons and controlling the LCD display and the LEDs.

• Saving of 9 run programs.

• Evaluating the errors recognized by the frequency converter.

• Voltage supply and evaluation of both speed sensors (tacho).

• Voltage supply and evaluation of the imbalance sensor.

• Controlling the motor-driven lid lock.

• Voltage supply 15 V DC and 5 V DC for the operating panel.

• Evaluating the temperature sensors and controlling the cooling.

• Evaluating the overtemperature switch in the centrifuge chamber.

• Status indication with an orange respectively a red LED:

All functions are all right: the yellow LED lights up

Case of error: the yellow LED flashes

Control-processor does not clock: the yellow LED does not light up

The frequency converter carries out the following tasks:

• Generating the motor current supply

(three-phase current with variable frequency and voltage)

Functional description: The supply voltage is rectified, smoothened and

chopped into a pulse width pattern in three bridge

elements with a microprocessor.

• Monitoring the motor current.

• Evaluating the overtemperature switch in the motor.

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• The braking chopper transfers the electrical energy produced during braking, in the

230 V version from a voltage of approx. 400 Volt and in the 115 V version from a

voltage of approx. 209 Volt, to the brake resistor in a controlled manner.

• Status indication with a green LED:

Standby: the green LED lights up

Centrifugation run: the green LED lights up

Case of error: the green LED flashes

If the drive processor detects an error, it switches off the motor.

3.3 Special features

• Multiprocessor concept:

The control- and the drive-processor monitoring one another. If one processor stops

working, the other processor switches off the drive.

• Interface concept:

The information transmission is monitored with an additional check sum.

• Hardware concept:

All safety related switches are break contacts. This also ensures that loose contacts

and cable rupture can be detected.

3.4 Brake resistor (R1)

• An overtemperature fuse protects the brake resistor against fire. If the braking

chopper has a short circuit, the brake resistor becomes hot due to the high current,

and the overtemperature fuse (F1) disconnects the supply voltage of the centrifuge.

3.5 Motor (M1) / tacho system (B4, B2.1)

• The motor is a three-phase asynchronous motor with two pairs of poles.

• A speed sensor (B4, 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.

• An additional speed sensor (B2.1, speedometer) is together with the imbalance

sensor (B2.2) in one housing. This housing is screwed to the bottom of the motor.

The speed signal (1 pulse per revolution) will be triggered by a magnet fixed at the

motor axle. This signal is used for the release of the motor-driven lid lock.

• The Electronics U320 (A1) monitors and regulates the speed.

− Double safety: The drive-processor has been programmed in such a way that it

switches off the drive when the speed is higher than the permis-

sible rotor speed. Then error message "FU/CCI-ERROR 84" will

be displayed.

• The Electronics U320 (A1) monitors the rotor standstill.

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3.6 Imbalance sensor (B2.2)

• An electronic sensor monitors the imbalance.

• The imbalance sensor and the speed sensor (B2.1) are together in one housing,

screwed to the bottom of the motor.

• Imbalance is detected only 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.

3.7 Motor-driven lid lock (A3)

• The lid can be opened only if the Electronics U320 (A1) has detected rotor standstill.

• By pressing the key

STOP / OPEN

the lid opens motor-driven.

• The motor locks the lid only if both lid brackets have actuated both switches in the lid

lock and the rotor has standstill.

• The centrifuge can only be started when the lid is closed.

3.8 Cooling system

The cooling system is a hermetical system.

The cooling system consists of the following components:

• Compressor

• Cooling tubes around the centrifuge chamber (evaporator)

• Condenser

• Dryer

• Fan

• Temperature sensor T1 (B1) and overtemperature switch in the centrifuge chamber

• Temperature sensor T3 (B3) on the condenser

In the housing of the temperature sensor T1 also the overtemperature switch is

included. With centrifuges with cooling the drive switches off, when the temperature is

> 60°C.

The refrigerant will be cooled down with a fan. The speed of the fan is controlled

dependent to the temperature at the condenser.

When opening the lid of the centrifuge, the cooling system switches off. The cooling

system is controlled dependent to the speed of the rotor.

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3.9 Safety devices

Mains switch ⇒with thermal overload protection

Over voltage protection and

radio interference suppression

filter

⇒on Electronics U320 (A1)

Additional radio interference

suppression filter

⇒in mains input circuit (only with 120 V model)

Frequency converter ⇒on Electronics U320 (A1), electrically protected

Motor ⇒Overtemperature switch (> 140 °C)

Centrifuge chamber ⇒Overtemperature switch (> 60 °C)

4 Troubleshooting procedures

• Fuses in installation in which centrifuge is installed are intact.

• Supply voltage present at (see circuit diagram):

− Connecting cable

− Appliance plug

− Mains switch

− Electronics U320 (A1), plug S100

• 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

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

Error designation No. Brief description Page

TACHO-ERROR 1 Speed sensor on top of the motor: Speedometer

pulses break down during rotation

TACHO-ERROR 2 No speedometer pulses after start command 12

IMBALANCE (3)* Imbalance on motor axle 13

CONTROL-ERROR 4 Lid lock error: lid opened without recognizing

rotor is at standstill

N > MAX 5 Excessive speed error, 250 RPM above n-max of

rotor

CONTROL-ERROR 6 Lid lock error 14

CONTROL-ERROR 8 Lid lock error 14

ROTORCODE 10.1 No start code recognized 14

ROTORCODE 10.2 Invalid rotor code 14

ROTORCODE 10.3 Error during reading the rotor code 15

MAINS INTERRUPT (11)* Mains interruption 15

N < MIN 13 Speed error: slippage is too high 15

CONTROL-ERROR 21 Faulty speed measurement 16

CONTROL-ERROR 22 Electronics U320 (A1): I2C bus 16

CONTROL-ERROR 23 Operating panel: Display-Timeout 16

CONTROL-ERROR 25 Electronics U320 (A1): EEPROM 16

CONTROL-ERROR 27 Electronics U320 (A1): EPROM 16

CONTROL-ERROR 29 Electronics U320 (A1): RAM 16

SER I/O-ERROR 30 Interface - error: Software protocol 16

SER I/O-ERROR 31 Interface - error: Timeout 16

SER I/O-ERROR 33 Interface - error: Software protocol parity bit 16

SER I/O-ERROR 36 Interface - error: NAK 16

* Error number will not be displayed

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