Kendro Multifuge 3 S-R, Multifuge 3 L-R, Legend RT User manual

Multifuge

3 S-R/3 L-R, Legend® RT

120V 50/60 Hz

SERVICE MANUAL P/N 12004376

TABLE OF CONTENTS

Section Title Doc.- No. Page 1 OPERATING INSTRUCTIONS

2 SERVICE

2.1 Servicing Schedule 2-1/2

2.2 Trouble Shooting 2-3

2.3 Error Code 2-4/7

2.4 Test Points 2-8

2.5 Imbalance Behavior 2-9

2.6 Cleaning of Instrument Parts 2-9

2.7 Electrical Safety Check 2-10

3 FUNCTIONAL DESCRIPTION

3.1 Block Functions 3-1

3.2 Main Board Functions 3-1/2

3.3 Key and Indication Board - Easycontrol 3-3 Key and Indication Board - Quickcontrol 3-4

3.4 Speed Detection Board 3-5

3.5 Rotor Indication 3-5

3.6 Imbalance Detection 3-5

3.7 Lid Lock System 3-5

3.8 Cooling Plant 3-5

4 DIAGRAMS

4.1 Block Diagram 4-1

4.2 Wiring Diagrams 4-2/3

4.3 Wiring Connection Diagrams 4-4/6

4.4 Main Board, Component Plan 4-7/14

4.5

4.6 Speed detection, Component Plan 4-17

4.7 Sensor Board, Component Plan 4-18

4.8 Rotor Detection Board, Component Plan 4-19/20

4.9 Cooling Plant 4-21

5 DISASSEMBLY OF INSTRUMENT PARTS

5.1 Housing / Casing Parts 5-1/2

5.2 Electrical Components 5-2/3

5.3 Drive Components 5-3/4

5.4 Cooling Plant 5-4

6 SPARE PART FIGURES AND LISTS

6.1 Spare Part Figures 6-1/9

6.2 Spare Part Lists

7 TECHNICAL BULLETINS

Display Board, “Easycontrol” Keypad version, Component Plan Display Board, “Quickcontrol” Rotary switch version, Component Plan

4-15 4-16

8 Preventive maintenance checklist

Calibration Certificate

Edition: 03 TABLE OF CONTENTS

22.11.01 AH Page: 0 - 2

Legend RT

Multifuge 3S-R / 3L-R

Service

2.1 Servicing Schedule (yearly procedure recommended)

2.1.1 Maintenance Routine without Dismantling the Centrifuge

2.1.1.1 Electrical Installation and Safety

• Switch OFF the centrifuge and disconnect the unit from power, check voltage supply and mains fusing (16 Amps, slow blow characteristic)

• Check condition of plug and wall socket - replace defective parts (customer’s responsibility)

• Check cord condition and fixing / connection - replace or refit it

• Check condition of instrument socket and replace it in case of bad contacts

2.1.1.2 Location and Mechanical Inst allati on

• Check the base (ground, table, lorry with lockable wheels etc.) for resonance-free and stable conditions

• Check for a well ventilated place and sufficient distances to walls or adjacent equipment, without exposition to direct sunlight

• Check the leveling of the centrifuge drive with use of a spirit level

2.1.1.3 Lid Tumbler Mechanism and Safety Device

• Connect the centrifuge to power and switch ON

• Check for correct automatic lid closing and self-acting lid opening - if in disorder, readjust lid,

swivel hinges, and/or locking devices

• Check the rubber gasket for lid’s and bolt’s sealing and replace, if damaged

• For checking the electronically safety circuit: start the centrifuge, let it shortly run and stop it, the

lid must not be unlocked by the microprocessor as long as the speed is more than 60 rpm - if safety circuit is out of function, replace main board

2.1.1.4 Cleanliness of Spin Chamber and Motor Casing

• Open the lid and remove the rotor (for loosening turn the T-handle Allen key (5mm) in arrow direction - see rim of rotor chamber)

• Clean the spin chamber with a dry and absorbent cloth (remove all dust and moisture - see also section for Cleaning)

• Check the cleanliness of the motor flange and take care of the annular slot around the motor shaft: penetrating fluids can damage the upper spindle bearing or electronics, remove fluids with an injector and/or absorbent paper

2.1.1.5 Rotor and Accessories Condition and Sealing, bellows

• Check the condition of rotors and accessory parts (especially all supporting or stressed partitions): the rotor and/or accessory parts must not be used any longer, if there are visible traces of mechanical damage or rust

• Check the condition of rotor and/or accessory sealing and replace them in case of malfunction

• Bellows of gas lid stays have to be greased upside down with glycerin (part no. 70902649) once a

year.

2.1.1.6 Rotor Fixing and Drive Spindle

• Check the perfect condition of the collet chuck and replace it in case of malfunction (thread is worn out, horizontal grooves etc. )

• Check the condition of the drive cone: the centrifuge must not be used any longer, if the drive cone is damaged (e.g. bend or it’s bearings are worn out)

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Legend RT

Multifuge 3S-R/3L-R

Service

2.1.1.7 Temperature Level (not at every unit)

• Check the wire gauze (behind the air inlet slots) left and right side for free ventilation, insufficient air flow will lead to an inadmissible temperature rise of compressor, motor and electronic parts

2.1.1.8 Imbalance Behavior

• Install available and empty rotors and check the imbalance behaviour with rotor dependant cut off and run through weights (see 2.5) and replace worn out motor rubber mounts, faulty main board or sensor board

2.1.2 Maintenance Routine after Dismantling the Centrifuge Casing

2.1.2.1 Motor Supporting Elements

• Check the supporting and damping elements of the drive motor and replace them in case of increased rubber abrasion or abundance of imbalance but at least every 3 years

2.1.2.2 Braking Circuit

• Check the function of the braking circuit (warming up of brake resistor, even and noiseless brake effect) and replace defective parts in case of malfunction

2.1.2.3 Lead and Screwing Connections

• Check the terminal and plug connections of all leads and on all boards and electrical components, tighten all loosen screwing connections, refit or replace defective parts

• Check the wedged connections of the board, mechanical and electrical components and re-tighten them if necessary (use screw locking lacquer for motor mounts and lid lock assembly)

2.1.2.4 Protection Earth Core and Groundi ng Con necti ons

• Check the protection earth core for continuity and all grounding plug connectors (see also 2.7 Electrical Safety Check)

• Check isolation resistance and accessible current (see 2.7)

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Legend RT

Multifuge 3S-R/3L-R

2.2 Trouble Shooting

Error

Indication

Error Cause

Service

Possible Error

Source

Mains switch with integrated fuse or

fuses on main board

Corrective Procedure

Switch on again, disconnect electric.

components success., search for other

faults

Displays

remain

dark

All display

Elements

are shortly

illuminated

Constant

No mains

voltage supply

No low voltage

supply for

indication board

Interrupted

program

CPU program

reset may be

caused by EMI

Interruption Parameter NV-RAM No or defective NV-RAM

Mains fuse or circuit

breaker failed

Faulty mains cord or

instrument socket

Faulty connection

from CPU to

indication board

Faulty indication or

CPU board

NV-RAM out of

socket or not

correctly placed

Reduced voltage

supply (<10%)

Bad or missing

ground connection

Check fuse or circuit breaker and replace o

switch on again

Check instrument cord and socket, replace

defective parts

heck connections on CPU, indication board

and connecting leads, replace defective

parts

Replace main board completely

Insert the valid NV-RAM and push it

correctly into socket

Remedy the failure if the voltage drops

often, use a voltage stabilizer

Check all ground connections and the

ground connection of all boards

Drive

makes

noises -no

good

separation

result

Lid cannot be opened

by key at

standstill

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Mechanics

Electrical

Locking drive is

not supplied

with voltage

Latch motor Faulty motor winding Replace complete motor

Lid is not

correctly locked

wear out of motor

rubber mount

Defective terminal

connection, faulty

lead or motor winding

Faulty power electr. Replace main board

24V supply

faulty relay K2

faulty driving circuit

Lid bolt is jamming

Lid is deformed Re-adjust the lid centrally

Replace motor rubber mounts (at least

winding resistances -see test points on

Push lid centrally into lock and press the

every three years)

Check voltage on motor terminal and

main board

Check voltage for drive motor

Check switch. after power ON

Replace the main board

No or defective NV-RAM

key again

Legend RT

Multifuge 3S-R/3L-R

2.3 Error code

Error

Indication

„rotor“ in

speed

display

Error Cause

Wrong selection

of detected rotor

Service

Possible Error

Source

Inadmissible speed

or rcf value was pre-

selected

Corrective Procedure

Press start again (within 15s), else wait for

rotor standstill, lid OPEN/CLOSE, set value,

start

“bAL“

message

appears in

speed

display

“Lid“

appears in

speed

display

Imbalance run

Lid was opened manually during

run

Protection circuit

(20V) interrupted

during run

Rotor not symmetri-

cally loaded

Base is not sturdy

enough and comes

into vibrations

Centrifuge drive is

not correctly leveled

Rotor itself has

imbalance

Drive shaft or rotor

fixing is damaged

Imbalance sensor Replace sensor board

Circuits of main

board

Forbidden

intervention

emergency opening

device must only be

used at standstill

Defective micro

switch or leads or

connectors to micro

switch are interrupted

Open lid, check rotor loading, close lid again

and restart

Change or reinforce the base (table, lorry with

lockable wheels, etc.)

Level the drive correctly by means of unit’s

feet

Rotor must no longer be used, send back to

Kendro

Replace collet chuck or motor

Replace the main board

Close lid immediately, turn power OFF/ON,

press lid down for locking, press start key,

press stop to finish run

Check leads and connectors to micro switch, in case of a faulty micro switch, replace them

Loose plug

„OPEn“

appears in

speed

display by

supposedly

closed lid

“S-LID”

appears in

display

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20V supply for

protection circuit

is interrupted at

standstill

Sensor signal not

clear

connectors

Interrupted leads to

micro switch

Defective micro

switch

Latch not in valid

position during power

Check plug X20

Check leads to micro switch for continuity

Replace micro switch

Switch unit “off” and “on” again

Legend RT

Multifuge 3S-R/3L-R

Error

Indication

Error Cause

Service

Error Code

Possible Error

Source

Corrective Procedure

„E-01“

message

„E-02“

message

„E-03“

message

„E-04“

message

“E-05”

message

“E-06”

message

“E-07”

message

“E-08”

message

“E-09”

message

“E-10”

message

“E-11”

message

“E-12”

message

“E-13”

message

„E-14“

message

System clock

pulse not stable

program

sequence was

disturbed

Stack overflow

Stack underflow

Reset by HW

watchdog timer

Data lines to key

board disturbed

Display board

doesn’t match to

main board

cooled/non-

cooled

Check sum error

E-PROM

Check sum error

NV RAM

NV RAM not

initialized

NV RAM doesn’t

match E-PROM

Check sum error

NV RAM

Check sum error

NV RAM

chamber over

temperature:

display >50°C

Hardware fault on

main board

Internal Software

problem

Internal Software

problem

Internal Software

problem

Software problem No action in the field possible

Wiring display board Check wiring and connectors

Check software Replace NV RAM and CPU

E-PROM failed Replace E-PROM

NV RAM failed Replace NV RAM

Initializing of NV-RAM

is not valid

Check versions of NV

RAM and E-PROM

NV RAM failed Replace NV RAM

Compressor didn’t

work

Faulty cooling cycle Exp. valve, refrigerant loss

Change CPU, replace main board

check NV-RAM and socket, insert the correct

Check leads, terminals, start relay, capacitor,

Change main board

No action in the field possible

NV-RAM

Replace NV RAM and E-PROM

compressor

„E-15“

message

„E-16“

message

„E-17“

message

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18.04.02/he/AH Page: 2 - 5

Open temp.

sensor

Short cut temp.

sensor

wrong or faulty

rotor detection

Check sensor, control

circuits

Check sensor, control

circuits

a wrong rotor was

installed

Mains voltage failure press stop key, wait for standstill and restart

Faulty detection

circuit

wait for standstill, open the lid and install a

Replace sensor or main board

correct rotor

replace the main board

Legend RT

Multifuge 3S-R/3L-R

Error

Indication

„E-18“

message

„E-19“

message

Error Cause

Bucket code

not valid for this

rotor

Rotor code not

programmed

Service

Error Code

Possible Error

Source

Corrective Procedure

Not valid

Wrong rotor installed Check rotor

Interference during

recognition

Check rotor recognition board and wiring

„E-20“

message

„E-21“

message

„E-22“

message

„E-23“

message

„E-24“

message

„E-25“

message

„E-26“

message

„E-27“

message

„E-28“

message

rotor code not

valid

Recognition disturbance

Speed signal

disturbance

Speed control

measuring

disturbance

Latch not in top

position

Time out latch

open

Time out latch

Signal given by

latch not valid

Wrong sense of

rotation

See E-19

wiring Check wiring

check was done

by rotor recognition

Check speed detection board

system

Micro switch failed,

Check micro switch adjustment, if necessary

de-adjusted, latch

Hall sensor signal not

applied

Hall sensor signal not

applied

Check latch motor and PCB

Wrong identified

signal after power

“on”

After replacement of

the motor- wires

mixed

replace it

Check hall sensors

Check wiring at terminal

„E-29“

message

„E-30“

message

„E-31“

message

„E-32“

message

„E-33“

message

Motor doesn’t

turn

Control-voltage

interruption

over-

temperature

motor >150°C

Over-

temperature

Electronic

High-pressure

Cooling system

PCB faulty, see E-21,

E-22

PCB failed Replace PCB

Hot motor, no air

circulation

Faulty main board Replace main board

Faulty high pressure

switch, blocked

system

Edition: 04 Servicing Schedule

18.04.02/he/AH Page: 2 - 6

Change PCB, rotor recognition, speed

detection, fasten motor wiring at terminal

Check motor, check grill for dust

Inspect cooling system

Legend RT

Multifuge 3S-R/3L-R

Error

Indication

Error Cause

Service

Error Code

Possible Error

Source

Corrective Procedure

„E-34“

message

„E-35“

message

„E-36“

message

„E-37“

message

„E-38“

message

„E-39“

message

„E-40“

message

„E-41“

message

Over-voltage

Over-current Main board Replace main board

NMI

interruption

Over-current

continuously

Current

measurement

disturbed

Speed control

check >n max. Acceleration of

the unit is too

slow

Offset voltage

from the

imbalance

sensor is in a

inadmissible

area

Brake resistor,

main board

Over voltage or over-

current

Main board Replace main board

Analog signal >

hardware over current

Speed > calculated

speed

Big imbalance

Motor or main board

faulty

Imbalance sensor

faulty Wiring from the speed detection board to the

main board is broken

Check brake resistors, replace main board

Replace main board

Check speed detection board, replace the

main board

Check rotor loading, motor and main board

Replace speed detection board

Check / replace the wiring

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Legend RT

Multifuge 3S-R/3L-R

Service

2.4 Test Points

Test Points Unit Value Conditions

Mains terminal

Board resistance

Motor over-temp.

terminal

X20/B3,B4*

Over-press switch

terminal X20/P

Fans cooling plant

terminal XK

Compressor

terminal XG

terminal box

–insulation value

Speed detection

plug XW

(1 to 4) (3 to 4)

speed

Imbalance sensor

plug XW

(1→4) (2→4)

120V

50Ω

20V DC

100 Ω

82 Ω

6,5 A 1,6 Ω 4,8 Ω

> 10MΩ

5V DC

4,4V

n=f*30

12V DC

a(t)

All given values are related on 120 V (+/- 10%) mains voltage for

board supply

Voltage drop by one disconnected lead (error case) and linked

terminal XR

Voltage drop by one disconnected lead (error case) and linked

terminal XO

Switch OFF unit, fan resistance temperature 20°C

wire black to blue

wire brown to blue

Switch OFF unit, compressor temp. 20°C

Resistance of main coil + (starting relay 0.1Ω)

Resistance of auxiliary coil (joints 13 -> 14)

Resistance inter phase and motor casing

Board with active filter circuit

Low voltage supply Light barrier is passed through (slot position) Light barrier is out (turn cone a little by hand)

When centrifuge is running

Low voltage supply of sensor board

Amplitude of lateral acceleration is rotor and speed dependent,

analyzed for n > 250 rpm

Motor current I

cable (U,V,W)

Motor winding

resistance 20°C –

insulation value

Brake resistor

terminal XD

Rotor detection

plug XR

Temp. measuring

plug XU

3 * 7A

3 * 5,2A 3 * 3,0A

3x2,5Ω

> 10MΩ

60Ω

5V DC 0V DC

Switch OFF unit, 2 resistors parallel connected, resistance at

pulse pause lengths, this pulse mode is generated by 4 alternately

Split core transformer with Flukemeter

maximum during acceleration

Rotor #6441, set speed = 3750min

Switch OFF unit, pull off motor plugs, measure inter

U -> V, V -> W, W -> U

Resistance inter each phase and motor casing

Per rotor revolution 2 different long

pulses are separated from 2 different

Chamber temperature 20°C (PT100: Chamber temperature -10°C (PT100: Chamber temperature 40°C (PT100:

Edition: 04 Servicing Schedule

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20°C

polarized magnets

-1

, 560W

≈

108Ω)

96Ω)

≈ ≈

116Ω)

Legend RT

Multifuge 3S-R/3L-R

Service

2.5 Imbalance Behaviour

• Install in table available rotor(s) in unloaded condition

Rotor/Bucket Run through

weight

75006445/75006441 20 grams 30 – 40 grams

• Insert rotor dependent cut-off weights and position them at angles of 90° to each other, the centrifuge must stop 4 tim es indicating “bAL“ message - in case of false behaviour see trouble shooting: no “bAL“ indicatio n.

• Insert the admissible imbalance weights in the same manner, the centrifuge must run through 4 times to maximum rotor speed.

2.6 Cleaning of Instrument Parts ATTENTION - WARNING!

The electrical and electronic components must not be cleaned with moist detergents!

For Cleaning the centrifuge housing or its accessories see Operating Instructions section 1 (maintenance and care).

• Electronic components

Clean dusty components carefully with a dry and soft brush and remove loose dust with a vacuum cleaner.

• Fans Scratch off car efully with a knife or similar tool the cr usted dirt from the fans ’ blades. Resulting grooves or marks must be removed subsequently with a fine abrasive cloth. Loose dirt is to remove with an absorbent cloth or vacuum cleaner.

• Vent holes Remove dirt from the vent grid behind the front panel by using a brush and vacuum cleaner.

• Condensers of cooling plant (if available) The louvers between the c ondensers’ heat air deflect ors have to be vacuum c leaned. In case of persistent dirt the unit must be carried to an appropriate place where the condensers can be cleaned with compressed air from inside to outside. Bended heat air deflectors have to be realigned correctly.

Cut off weight

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Legend RT

Multifuge 3S-R/3L-R

Service

2.7 Electrical Safety Check

ATTENTION!

A final electrical safety check must be performed after each maintenance and/or repair!

• Resistance check of protective conductor The measuring value of the resistance between the mains plug's grounding pin and the grounding conductors of the motor, electronic chassis and the casing must not exceed 200 mΩ.

• Insulation resistance Check Check also the insulation resistance between the poles of the mains plug and the grounding conductor; the resistance value must be more than 2 MΩ.

• Accessible current measured to EN 61 010 The accessible current must not exceed 3.5 mAmps in single fault condition (interrupted protection earth wire)! In accordance with the EN61010, IEC1010 and UL3101 such a fault condition can be reproduced by the following measuring circuit.

Steckergehäus e / plug-in casing

L (N) N (L) PE

500

±1%

Ω

0,22µF

±5%

Ω

Körperstrom:

accessible current:

U = 1750mV I = 3,5mA

10k

±5%

0,022µF

±5%

I [mA] = U [mV] / 500 :

max max

≡

Spezifaktionen für Meßgerät

- TRMS, DC - 5kHz oder mehr

- Eingangswiderstan d > 1M

- Toleranz 5% oder besser

- Crest Faktor 5 oder besser

Specifaction for the meter

- TRMS, DC - 5kHz or more

- Input resistance > 1M

- Tolerance 5% or better

- Crest Factor 5 or better

Ω

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Legend RT

Multifuge 3S-R/3L-R

3 Functional Description

3.1 Block Functions

The Multifuge 3L-R/3S-R, Legend RT is a refrigerated microprocessor controlled laboratory tabletop centrifuge with noise reduced induction drive motor incorporating automatic rotor and imbalance detection and self-closing door locking systems.

The unit is equipped with following boards and components (block diagram 4-1):

• Instrument socket for mains cable at the back

• Two poles mains switch

• Main board with microprocessor part and power electronics

• Key and indication board (program: EASYCONTROL II with temp. Display or QUICK-CONTROL

with adjusting knob)

• Sensor board with rotor detection sensors

• 3 phase induction motor with integrated thermal over-temperature switch (C. O. 150°C)

• Speed detection and imbalance board with filter attached to the motor’s bottom by screws

• self-closing door locking system (mechanical bolt keeper, motor dis-locking)

• 2 parallel brake resistors mounted on safety chamber (one with overtemp.sensor)

• axial-flow fan for power electronics, motor and chamber

3.2 Main Board Functions

The Main board is mounted at the housing behind the front panel. The components on main board are arranged in following function blocks (see wiring diagram page 4-2 and 4-3).

• Noise filter in accordance with EN 55011 for motor and triac circuits

• Power pack for low voltage supply of microprocessor part and power electronics

• Triac driving circuits for compressor cut-in relay, for 2 independent fan wiring terminals and for

connection of a heater (special use)

• DC intermediate circuit for supply of frequency converter equipped with automatic loading and voltage (brake) controlling circuits

• Power part inclusive physically separated driving stages

• Microprocessor part with CPU, E-PROM and NV RAM

• Driving component for self-closing lid lock device

• Interface component for serial RS232 (option)

• Exchangeable NV-Ram and E-PROM containing specific data of the unit

3.2.1 Power Pack

The power pack consists of 2 transformers, 2 rectifiers (single diode) and 2 voltage regulators, which generates the following low voltage levels:

• U1 = 5V: by switched-mode regulator LM2575T-5.0, VDD, VCC

supplies all processors and its electronic components on main and indication board

• U2 = 24V: unregulated

is used for the driving of lid lock motor and relays K2, K3; the reference potential is GND, VSS

• U3 = 20V: by 2nd transformer, rectifier diodes and fix voltage regulator 7820

serves for supply of driving of the power electronics via the protection circuit by closed lid switches reference potential: 0V CAUTION - MAINS POTENTIAL!

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Legend RT

Multifuge 3S-R/3L-R

Main Board Functions

3.2.2 Intermediate Circuit

The DC intermediate circuit serves as an energy store between the AC power input and the transmitted motor performance. The intermediate circuit consists of a heat-sink-cooled bridge rectifier and several reservoir capacitors which are softly charged across a power resistor R76 when ever the unit is switched on. After the loading time (CPU initialization time) the power resistor is linked by the relay contacts of K3. When switching the unit off, the DC voltage of the intermediate circuit is discharged across a path of resistor R1, R2.

3.2.3 Brake Path

Electrical power is fed back into the intermediate circuit during motor deceleration (motor acts as generator). This braking power is transformed into heat by two parallel connected resistors so that the intermediate circuit voltage does not rise to an excessive level. The brake resistors are switched into the intermediate circuit by a fast switching transistor (pulse-width modulation, synchronized by the double mains frequency). This transistor is voltage dependent controlled by a self-acting stage (closed loop).

3.2.4 Frequency Converter

The motor is 3-phased, provided with chopped direct voltage blocks (chopped frequency approx. 5kHz, amplitude is height of DC intermediate voltage). These blocks are variable in frequency and pulse-width modulation, 120° out of phase. These 3 phases are controlled during acceleration, running at set speed and deceleration (e.g. for small speed: low frequency and small pulse-width length will be affected). The FC is protected against over current, over temperature and over-voltage.

3.2.5 Microcontroller (Central Processing Unit) Part

The software identification No's of the CPU and data storage’s (NV-RAM) ST24C32 are sequentially displayed in speed and time fields:

Press program place no 2 during switch on

• CPU Operating panel: 526 P05

• Firmware: 528 200

• NV-RAM: 4468 105

The actually indicated version No.'s are displayed in the time field and will be upgraded if program or data changes are necessary. The control program (ROM) is integrated in the controller component. The most important operating parameters (e.g. the maximum data for all rotors, the last operator settings, the basic values for speed and temperature controlling, data of acceleration and deceleration curves as well as 4 data sets of program places are stored in the non volatile (NV)-RAM. When calling this routine the actual value of all centrifugation cycles (“CYL“) is also shown in the display (as fourth No.) before the check routine for all program places puts an end to the initialization time (approx. 18s). The CPU co-operates with the E-PROM component via the 16 bit data bus and some control lines. The CPU is an integrated circuit, generating all required output signals, monitoring and analyzing all input signals.

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Legend RT

Multifuge 3S-R/3L-R

3.3 Key and Indication Board - Easycontrol

The key and indication board is mounted behind the operating panel. The connection to the main board is done by a 4 pole cable by which the serial data transfer as well as the low voltage supply of 5V is verified. The 7-segment displays, the control LED’s and the operating keys are managed by an own controller unit (first identification No. 591) in multiplex processing. For the programming serves EASYCONTROL II (see Operating Instructions).

Functions of keys elements (Easycontrol)

Keys Designation Function(s)

S1 – S4

S5 Arrow up Acceleration profile 1 to 9 S6 Arrow down Deceleration profile 1 to 9 S7 Speed arrow down Decrement the value of the set speed S8 Speed arrow up Increment the value of the set speed

S9 Bucket Setting of the rotor / bucket number S10 At the same time Switching between rpm and rcf display S11 Time arrow down Decrement the value of the set time S12 Time arrow down Increment the value of the set time S13 Temp. Arrow down Decrement the value of the set temperature S14 Temp. Arrow up Increment the value of the set temperature S15 Frost Pre cooling S16 Double arrow Quick run – hold button pushed S17 Lid symbol Open the lid S18 Arrow right Normal start of the centrifugation S19 Red square

Program

place 1 to 4

Store or recall programs

Manual stop of a run

Functions of Indicating Elements (Easycontrol)

Indicat. Designation Function(s)

H1 Buzzer Audio signal H2 Accel. curve digit Display defined acceleration curves 1 to 9 H3 Decel. curve digit Display defined deceleration curves 1 to 9

Speed in rpm (rounded to full 10 rpms)

Rotor not yet detected (xxx „.“)

H4-H7,

H12

H13-H15 Time range

H16,H17 Temperature range

H18 Allocation LED For speed indication H22 Allocation LED For rcf indication

H19,20,

24,25

Speed range

Rotation Rotor spinning

rcf-value (xg) or not yet possible to calculate „-----“

Identifications no.’s of controller and NV-RAMs,

Lid open condition („OPEn")

Centrifuge run is terminated („End")

Error messages („Lid“, „E-xx“, „bAL“, „rotor“)

Centrifugal time in h.min (count down process)

Count up process (hld) in h.min (count up process)

Actual version number („xx“)

Sample temperature in °C± 2K when pre-cooling or

pre-heating process is terminated

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Legend RT

Multifuge 3S-R/3L-R

Key and Indication Board - Quickcontrol

Functions of keys elements (Quickcontrol)

Keys Designation Function(s)

S1 Adjusting knob Set point temperature

S2 Adjusting knob Set point time

S3 Adjusting knob Set point speed

S6 Arrow up Deceleration profile 1 to 3

S9 Bucket Setting of the rotor / bucket number S10 At the same time Switching between rpm and rcf display S16 Double arrow Quick run – hold button pushed S17 Lid symbol Open the lid S18 Arrow right Normal start of the centrifugation S19 Red square

Functions of Indicating Elements (Quickcontrol)

Manual stop of a run

Indicat. Designation Function(s)

H1 Buzzer Audio signal H3 Decel. curve digit Display defined deceleration curves 1 to 3

Speed in rpm (rounded to full 10 rpms)

Rotor not yet detected (xxx „.“)

H4-H7,

H12

H13-H15 Time range

H16,H17 Temperature range

H18 Allocation LED For speed indication H22 Allocation LED For rcf indication

Speed range

rcf-value (xg) or not yet possible to calculate „-----“

Identifications no.’s of controller and NV-RAMs,

Lid open condition („OPEn")

Centrifuge run is terminated („End")

Error messages („Lid“, „E-xx“, „bAL“, „rotor“)

Centrifugal time in h.min (count down process)

Count up process (hld) in h.min (count up process)

Actual version number („xx“)

Sample temperature in °C± 2K when pre-cooling or

pre-heating process is terminated

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13.03.01/he Page: 3 - 4

Legend RT

Multifuge 3S-R/3L-R

3.4 Speed Detection Board

On a small board, which is attached underneath the motor, the circuits for speed detection and signal shaping are arranged. The motor speed is optically detected by an infra-red light barrier. The motor axle has a hole at the same level as the light barrier. This effects that the light beam will be interrupted twice during one motor revolution. A following pulse shaping stage on board forms square-topped pulses which are led via XW1 to the main board. The speed pulses are counted by the CPU to display the exact motor speed.

3.5 Rotor Indication

In the rotor’s bottom 4 magnets are forced, being alternately arranged in polarity and positioned to each other to different distances on a constant circular ring (segment steps of 20°). A Hall sensor is exactly fixed below to the sensor board. The magnets are switching a flip-flop stage by which different pulse lengths and pulse intermissions are generated during one rotor rotation. By this signal the CPU is able to detect up to 65 different rotors and the correct direction of rotation, too.

3.6 Imbalance Detection

On the speed detection board a piezoelectric acceleration detector is additional fixed. Dependent of the rotor imbalance this sensor generates an analogous voltage signal which is led via a following band-pass filter to plug connection XW1/2 to main board, where it is analysed by CPU. When the CPU) has identified the installed rotor type, the speed dependent imbalance limitation curve from EPROM The analogue imbalance signal is filtered, converted into digital form and continuously comperated with this specific limitation curve. If the actual imbalance signal will rise at any speed beyond the limit, the error signal for imbalance load “bAL“ will be displayed and the unit slows down.

3.7 Lid lock system

The latch is directly controlled by CPU via a PWM motor driver. If all necessary signals are existing which allow an opening the motor is fired with a pulsed voltage of 24 VDC. For additional safety the relay K2 will be activated if the speed is below 120 rpm controlled by triggered mono-flops.

3.8 Cooling plant

The Multifuge 3SR/LR, Legend RT is equipped with a high-grade cooling plant, to meet it’s requirements of driving power and compact design. The CFC free refrigerant R404A evaporates at low temperatures (≤ -20°C) and absorbers through this the frictional heat from chamber produced by the fast spinning rotor. 5 fans serve for even air flow through condenser so that the refrigerant’s condensing temperature is kept on a low level (lateral front fans are only switched on, if n > 0 rpm). A specially designed coaxial heat exchanger serves for essential undercooling of the condensed refrigerant to ensure an optimum evaporation and a perfect operation of the expansion valve. To maintain low evaporation and resultant condensation temperatures on one hand and to support the starting procedure of the compressor on other hand, a thermostatic expansion valve with 3.0bara MOP is used. The minimum achievable sample temperatures are depending on speed, rotor type and a little on ambient temperature. After a compensating time, given by the pre-cooling or pre-heating program as optimal result, the rotor has reached the selected set temperature within a tolerance of ± 2K. To reduce the power consumption of the unit the compressor will not be activated during accelerating of the motor. When reaching the selected speed the compressor will be activated if a low temperature had been selected.

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13.03.01/he Page: 3 - 5

Legend RT

Multifuge 3S-R/3L-R

Unit's Plug

SCHEMATIC DIAGRAMS

132

0 0

SORVALL

Mains Switch with Over-current Release

16A

P/L/PE

XD1

LEGEND

X13

+/-

rpm

x g

KEY AND INDICATION BOARD

MAIN BOARD

X20

X122 1/2/3

X11

XW1

Temp. Sensor

100

X12

Sensors for Lid Lock

X12

X17

X14

Rotor Detection

XXX

XR1

X20

Overtemp.

Edition: 04

04.07.02 AH

F3F4 F5

R2 R3

Lid Lock SwitchBrake ResistorBrake Resistor

Overtemp. SwitchLid Lock

Motor

Speed Detection

2 Pulses/revolution

Imbalance Sensor

a(t)

Block Diagram

4-1

Resistor for Speed Limit

Compressor

Fan

Fan for

Compressor

Pressure Switch

Multifuge 3S-R / 3L-R / Legend RT

16A

Mains

NPE

120V

SCHEMATIC DIAGRAMS

4R7 11W

DC Intermediate Circuit

noise filter

+24V

DC Charging Circuit

BYPASS

Autom. Brake Control

X4/L

+24V

+5V (VCC) (VDD)

X4/N

+24V

LM2575T-5.0

GND VSS

+325V

MAIN BOARD

X4/PE

Chassis

Edition: 04

04.07.02 AH

Ground Motor

COOLING

GND

X17/G

Compressor

with Starting Relay

X12/M

240µF

Speed Reduction

FAN2

FAN1

X12/V

4,0µF

XA2

Fan for CondenserResistor for

Lid Lock Switch

7820

X20/B

Motor

Overtemp.

X20/P

21bar

Overpressure

Switch

+20V

OVERPRESSURE

XD1/R

2 x 120W

Brake Resistors with

Overtemperature Protector

Wiring Diagram

4-2

Multifuge 3S-R / 3L-R / Legend RT

SCHEMATIC DIAGRAMS

KEY AND INDICATION BOARD

MAIN BOARD

20V

+325V

Frequency Converter

Current Control Restistor

X122/

20V

0V*

µC87C54

EASYCONTROL II

0526Vxx

GND

COOLING (M2)

K3 (BYPASS)

0528Vxx

Fan1 (M3)

Fan2 ()

Heating ()

6 IGBT’s

RESET

LID_CLOSED OVERVOLTAGE OVERCURRENT MOTOR_OVERTEMP. ELECTRONIC_OVERTEMP. OVER_PRESSURE POWER_FAIL

CPU

NV-RAMEPROM

4467Vxx

µP - Part

LID_LOCK_BRAKE LID_LOCK_ENABLE LID_LOCK_DIRECTION

LID_NEARLY_CLOSED LID_LOCK_CLOSED LID_LOCK_OPEN

24V

GND

24V

Lid Lock Driving

in:

out:

dyn

X5/U1

X5/U2

XR/ 1 2 3

+5V +5V

GND

XW/ X14/ 3 5 7

234

X13/

Edition: 04

04.07.02 AH

Motor

3 x 2,5

Physical Separation

PT100

Temperature Sensor

Hall Effective Sensor

Wiring Diagram

4-3

n=0:

n>0:

Speed Detection Board

a(t)

+5V

GND

Lid Locking Device with

Switches and Sensors

Multifuge 3S-R / 3L-R / Legend RT

SCHEMATIC DIAGRAMS

Mains Input

Start Capacitor

Relay for Compressor

PCB Rotor Detection (fill up)

PCB Speed and Imbalance Detection

( under the motor)

Motor

Pt100 Temperature Sensor

Switch at the left Lid Lock

Motor for Lid Lock

Switch Lid Lock

PCB Sensors for Lid Lock

Resistor for Fan

Edition: 04

04.07.02 AH

XW1

Line

Out

Toroidal Core with

2 electrical windings

Compressor

Over Pressure Switch

Brake Resistor

Temperature Fuse

Condenser

Fan for Condenser

Switch at the right lid lock

Capacitor for Fan

Toroidal Core with

2 electrical windings

Mains Switch

Toroidal Core with

1 electrical winding

Wiring Connections Diagram

4-4

Multifuge 3S-R / 3L-R / Legend RT

Temperature Sensor

PCB sensors for Lid Lock

Motor for Lid Lock

PCB Rotor Detection

PCB Speed and Imbalance Detection

Switch Lid Lock

SCHEMATIC DIAGRAMS

Fan for Condenser

Resistor for Fan

Motor

Over Temperature Switch Motor

PE - Terminal

Mains Input

Compressor

Over Pressure Switch

Brake Resistors

Mounting of Unit Ground

1x PE terminal 3 pole 1x screw M4x10mm 2x fan washer 4,3mm

34 5 6 7 8 910 1112 13 14 15

XW1

MAIN BOARD

Edition: 04

04.07.02 AH

Key- and Indication Board

Wiring Connections Diagram

4-5

Multifuge 3S-R / 3L-R / Legend RT

SCHEMATIC DIAGRAMS

Connection Diagram Compressor

Compressor

Main Board G2, black Main Board G1, white

Starting

Capacitor

Starting Relay

BLK

WHT

grn yel

Edition: 04

04.07.02 AH

Wiring Connections Diagram

4-6

Multifuge 3S-R / 3L-R / Legend RT

+ 51 hidden pages

Kendro Multifuge 3 S-R, Multifuge 3 L-R, Legend RT User manual

Specifications and Main Features

Frequently Asked Questions

User Manual