Hettich MIKRO 22 Guida all'installazione

Andreas Hettich GmbH & Co. KG •Gartenstraße 100 •D-78532 Tuttlingen •Germany

Phone: (07461) 705-0 •Fax: (07461) 705-125 •Internet: www.hettichlab.com •e-mail: [email protected], [email protected]

Repair instructions

MIKRO 22 / 22 R

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TABLE OF CONTENTS

1. INTRODUCTION...................................................................................................... 6

2. DESCRIPTION OF THE NEW HETTICH CENTRIFUGES ...................................... 7

2.1. Functional structure of the Mikro 22 / 22 R ...................................................... 7

2.2. Control panel (CP) ........................................................................................... 7

2.3. Supply board (SB) A1 ...................................................................................... 8

2.4. Frequency converter (FC) A2 .......................................................................... 8

2.5. Special features ............................................................................................... 9

2.6. Motor / Tacho system ...................................................................................... 9

2.7. Imbalance switch ........................................................................................... 10

2.8. Interlocking .................................................................................................... 10

2.9. Cooling........................................................................................................... 10

2.9.1. Temperature sensor B1 in the centrifuge chamber ................................. 10

2.9.2. Function of the cooling board (CB) A3 .................................................... 10

2.10. Fan................................................................................................................. 10

2.11. Offset calibration............................................................................................ 11

2.12. Protection....................................................................................................... 11

3. REQUIREMENTS FOR ERROR IDENTIFICATION .............................................. 12

3.1. Correct power supply..................................................................................... 12

3.2. Functional check............................................................................................ 12

3.3. Procedure for diagnosing errors .................................................................... 12

4. ERROR MESSAGES ............................................................................................. 13

4.1. Brief description ............................................................................................. 13

4.2. Description and elimination of errors.............................................................. 15

5. FACTORY SETTING ............................................................................................. 23

5.1. Control panel ................................................................................................. 23

5.2. Procedure for initialisation.............................................................................. 23

5.3. Imbalance Mode ............................................................................................ 24

5.4. OFFSET alignment ........................................................................................ 24

5.4.1. OFFSET value ........................................................................................ 25

5.4.2. Procedure for performing an OFFSET alignment.................................... 25

5.4.3. Note for temperature sensor in centrifuge chamber................................ 25

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6. FUNCTION RETRIEVALS / SETTINGS................................................................. 26

6.1. Acoustic signal ............................................................................................... 26

6.2. Hours of operation.......................................................................................... 26

6.3. Slippage of the drive ...................................................................................... 27

6.4. Setting display contrast on control panel........................................................ 27

7. FUNCTIONAL CHECK........................................................................................... 28

7.1. Functional check at factory............................................................................. 28

8. FUNCTIONAL TEST .............................................................................................. 30

8.1. Checking the proper working order ................................................................ 30

8.2. Proper working order after repairs.................................................................. 30

9. ASSEMBLING AND DISASSEMBLING COMPONENTS...................................... 30

9.1. Speed sensor B3 (speedometer) ................................................................... 33

9.2. Motor M1 / Vibration damper.......................................................................... 33

9.3. FC (frequency converter) ............................................................................... 33

9.4. SB (supply board) A1 ..................................................................................... 33

9.5. CB A3 (cooling board) only MIKRO 22 R ....................................................... 33

9.6. CP (control panel) A4..................................................................................... 34

9.7. EPROM at CP................................................................................................ 34

9.8. CC (control cables) ........................................................................................ 34

9.9. LL (Y1) (lid locking) ........................................................................................ 34

9.10. BR R1 (brake resistor) ................................................................................... 34

9.11. Radio interference suppression filter Z1......................................................... 34

9.12. Mains choke coil (L1) ..................................................................................... 34

9.12.1. Assembly and disassembly ..................................................................... 34

9.12.2. Short the mains choke coil ...................................................................... 35

9.13. Mains switch Q1............................................................................................. 35

9.14. Appliance plug B4, overvoltage protection F1 ................................................ 36

9.15. Imbalance switch S1 ...................................................................................... 36

9.16. Temperature sensor B1 in centrifuge chamber .............................................. 36

9.17. Temperature sensor B2 at condenser............................................................ 36

9.18. Fan M3........................................................................................................... 36

9.19. Compressor M2.............................................................................................. 36

9.20. Lid spring........................................................................................................ 37

9.21. Hinge block .................................................................................................... 37

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10. SPEEDOMETER-CODE-POSITION OF THE ROTORS .................................... 38

11. CIRCUIT DIAGRAMS......................................................................................... 40

11.1. Mains supply with supply board (SB) 230 V................................................... 40

11.2. Mains supply with supply board (SB) 115 V................................................... 41

11.3. Circuit diagram supply board (SB) ................................................................. 42

11.4. Connecting diagram and component layout supply board (SB) ..................... 43

11.5. Signals at control cable (between CP-SB) ..................................................... 45

11.6. Block diagram control panel (CP) .................................................................. 46

11.7. Connecting diagram Control board (CP)........................................................ 47

11.8. Block diagram and signals at frequency converter (FC) ................................ 48

11.9. Connecting diagram frequency converter (FC) .............................................. 51

11.10. Circuit diagram cooling board..................................................................... 52

11.11. Connecting diagram and component layout cooling board......................... 54

12. TECHNICAL SPECIFICATIONS ........................................................................ 57

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Abbreviations

CP Control panel

FC Frequency converter

SB Supply board

CB Cooling board

CC Control cable

LL Lid locking

BC Braking chopper

BR Brake resistor

MR Mains reset

Mains switch OFF - ON

EC Error cause

ES Error consequence

ER Error remedy

M Measurement

ECR Error-code reset

6/51

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.

CP : control panel, FC : frequency converter, SB : supply board, CB : cooling board, CC : control cable, LL : lid locking, BC : braking chopper,

BR : brake resistor, MR : mains reset, EC : error cause, ES : error consequence, ER : error remedy, M : measurements, ECR : error-code reset

7/51

2. Description of the new Hettich centrifuges

2.1. Functional structure of the Mikro 22 / 22 R

These microprocessor-controlled centrifuges are comprised of the following electrical

components:

• Control panel (CP), microprocessor-controlled

• Supply board (SB)

• Frequency converter (FC, motor control), microprocessor-controlled

• Motor with speed sensor (speedometer)

• Braking chopper (BC) with brake resistor (BR)

• Lid locking (LL)

• Cooling board (CB), only Mikro 22 R

2.2. Control panel (CP)

The CP is the ”brain” or ”master” of the centrifuge.

Via a serial data bus system, the MASTER controls its SLAVE, the component:

− frequency converter (FC)

The individual tasks of the CP are:

• Management of operator inputs and control of LCD display

• Storage of 3 run programs

• Control of components:

− FC via the enabling circuit and via the serial interface

− cooling and fan

• Evaluation of the speed sensor (speedometer)

• Evaluation of the imbalance switch.

• Evaluation of the FC fault alarm circuit

• Evaluation of the LL open/closed signalling circuit

• Control of the relay for the LL solenoid at rotor standstill

• Temperature measurement and sensor evaluation of the temperature sensor in

centrifuge chamber (only refrigerated centrifuge).

• Routine for input, storage and transfer of temperature offset values

• Format of the serial interface:

5 Volt interface with 3 conductors

(16-pole control cable, pole 6, 8 and 11)

• The CP is powered from the SB via the control cable:

+ 10...15 Volt pole 1,2

GND pole 15,16

CP : control panel, FC : frequency converter, SB : supply board, CB : cooling board, CC : control cable, LL : lid locking, BC : braking chopper,

BR : brake resistor, MR : mains reset, EC : error cause, ES : error consequence, ER : error remedy, M : measurements, ECR : error-code reset

8/51

2.3. Supply board (SB) A1

The SB performs the following individual functions:

• 12 V DC and 5 V DC supply for the SB.

• 12 V DC supply for the CP.

• 12 V DC supply for the CB (only Mikro 22 R).

• Plugging station X5 for mains power supply, LL magnet and transmission of the

signalling circuit for LL switch (open/closed over opto-coupler to the CP).

• Power supply for speed sensor (speedometer).

• Plugging station X4 for speed sensor cable and transmission to the CP and FC.

• Control of the relay for the LL solenoid at rotor standstill

• Plugging station X3 for the imbalance switch and direct transmission of the imbalance

signal to the CP.

• The 5 Volt interface with 3 conductors is converted to an RS 485 interface with 2

conductors:

Interface to FC: RS 485-interface via 2 conductors -

• Transfer of primary enabling (=Hardware STOP) CP ⇒FC

• Transfer of fault circuit (=FC-ERROR) FC ⇒CP

2.4. Frequency converter (FC) A2

The FC performs the following individual functions:

• Generation of the motor power supply

(3-phase AC current of variable frequency and voltage)

Mode of operation: The mains supply is rectified, smoothed and chopped in three

bridge elements to give a pulse-duration modulated supply.

• Monitoring of the motor current

• Evaluation of the overtemperature switch in the motor (only version 115V, AC)

• Slave behaviour (handling of interrogations and commands from the CP via the serial

interface):

RS 485-interface with 2 conductors

(10-pole control cable, pole 3 and 5)

• Evaluation of the primary enabling (=Hardware STOP) for the FC

(10-pole control cable, pole 7)

• Evaluation of potential faults and monitoring of the fault circuit (=FC-Error)

(10-pole control cable, pole 4)

• The electrical power, which resulted from braking, will be conducted to the BR. The

braking chopper switches at a voltage:

- from approximately 390V (230V series)

- from approximately 200V (115V series)

• The BR is protected by an overtemperature switch. At a short circuit on the BC,

which is located on the FC, the BR overheats because of high current. The

overtemperature switch cuts off the voltage supply from the FC. After cooling down at

the BR the voltage supply is switched on again.

CP : control panel, FC : frequency converter, SB : supply board, CB : cooling board, CC : control cable, LL : lid locking, BC : braking chopper,

BR : brake resistor, MR : mains reset, EC : error cause, ES : error consequence, ER : error remedy, M : measurements, ECR : error-code reset

9/51

• The CP issues the following via the serial interface:

− Speed

− Starting and braking levels

− Control commands START, BRAKE, STOP

• State display by LED´s: In standby mode the green LED is on

In running mode the green LED is on

In fault mode the green LED flashes

If the FC processor detects a fault, it shuts down itself automatically and triggers the

fault circuit (FC-ERROR). The CP then interrogates the type of fault via the serial

interface.

2.5. Special features

• Multiprocessor concept:

Although one microprocessor will fail, the other one will continue to monitor its

assigned area.

If the CP fails, the drive will be shut down automatically by the FC when no inter-

rogations have been received via the interface for more than 30 seconds.

• Interface concept:

Transmission of data is monitored by an extra check sum.

• Hardware concept:

All switches with a safety relevant function are of the NC-contact type, which

means that loose contacts and open-circuit faults can also be detected.

2.6. Motor / Tacho system

• The motor is a 3 phase asynchronous motor with 2 pairs of poles.

• A speed sensor (speedometer) attached to the motor receives the following from the

transmitter attached to the rotor,

− rotor code information (see section 10) and

− speed data (6 pulses per revolution)

• The ACTUAL speed is monitored and controlled via the CP

− Double safety: The FC is also programmed that no value of speed

in excess of the maximum permitted rotor speed

can be selected. The FC monitors the speed and

switches off at excess speed with error code

“ERROR 84”.

• Rotor standstill is monitored via the CP.

− The lid can only be opened when the CP has detected standstill.

CP : control panel, FC : frequency converter, SB : supply board, CB : cooling board, CC : control cable, LL : lid locking, BC : braking chopper,

BR : brake resistor, MR : mains reset, EC : error cause, ES : error consequence, ER : error remedy, M : measurements, ECR : error-code reset

10/51

2.7. Imbalance switch

• 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.

2.8. Interlocking

• Opening of the LL is prevented by a latch. The LL can only be opened when the relay

on the SB is energized by the CP. This occurs when the rotor is at standstill and

mains power is applied. A solenoid is energized and releases the latch.

• The centrifuge can only be started when the lid is closed. A microswitch on the LL

detects the position of the LL.

2.9. Cooling

• Temperature behaviour:

− When rotor is at standstill and the lid is locked, the cooling is operating.

− When rotor is at standstill and the lid is unlocked, there is no cooling.

2.9.1. Temperature sensor B1 in the centrifuge chamber

• This temperature is processed in the CP.

• The housing of the temperature sensor B1 also contains an overtemperature switch.

In refrigerated centrifuges this switch cuts off the drive at > 60°C.

2.9.2. Function of the cooling board (CB) A3

• Plugging station (X3) for the temperature sensor and the overtemperature switch in

the centrifuge chamber.

• The voltage of the temperature sensor in the centrifuge chamber plug X4 being

transmitted over a 10-pole CC to the CP plug X101.

• The signal of the overtemperature switch in the centrifuge chamber plug X4 being

onward transmitted over a 10-pole CC to the CP plug X101.

• Plugging station (X2) for the overheating protection B2 at the condenser.

• Relay circuit for the compressor and the fan. The overheating protection B2 at the

condenser is series connected to the relay voltage.

• Plugging station (X1) for the compressor and the fan.

2.10. Fan

• The fan cools down the refrigerant flowing through the condenser.

• The fan is parallel-connected to the compressor.

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