Fisher Scientific accuSpin 1R User manual

Valid is only version of current data file
accuSpin1R SERVICE MANUAL
12003449

Edition:02 0 -0 accuSpin1R
17/11/03 Ha
TABLE OF CONTENS
Section
Title
Page
1OPERATING INSTRUCTIONS (not part of this manual)
2SERVICE
2.1 Servicing Schedule 2-1/2
2.2 Trouble Shooting 2-3/4
2.3 Error Codes 2-5/6
2.4 Test Points 120V models 2-7/8
Test Points 230V models 2-9/10
2.5 Imbalance Behaviour 2-11
2.6 Cleaning of Instrument Parts 2-11
2.7 Electrical Safety Check 2-12
3FUNCTIONAL DESCRIPTION
3.1 Block Functions 3-1
3.2 Main Board Functions 3-2/3
3.3 Key and Indication Board 3-4
3.4 Speed Detection Board 3-5
3.5 Cooling Plant 3-5/6
4DIAGRAMS
4.1 Block Diagram 4-1
4.2 Wiring Diagrams 4-2/4
4.3 Wiring Connection Diagrams 120V models 4-5/7
Wiring Connection Diagrams 230V models 4-8/10
4.4 Main Board 120V –Component Plan 4-11
Main Board 230V –Component Plan 4-12
4.5 Main Board –Wiring Diagram 4-13/20
4.6 Display Board -Component Plan 4-21
4.7 Display Board –Wiring Diagram 4-22/24
4.8 Speed Detection Board -Component Plan & Wiring Diagram 4-25
4.9 Cooling Plant 4-26
5DISASSEMBLY OF INSTRUMENT PARTS
5.1 Housing / Casing Parts 5-1/2
5.2 Sealing assembly 5-2/3
5.3 Mechanical Components 5-3/4
5.4 Electrical Components 5-4/5
5.5 Drive Components 5-6
5.6 Fans 5-6
5.7 Imbalance Switch 5-7
5.8 Cooling Plant 5-8
6 SPARE PART FIGURES AND LISTS
6.1 Break Down Drawings 6-1/6
6.2 Spare Part Lists
7 Preventive maintenance checklist 7-1/3
Calibration Certificate 7-4
8 TECHNICAL BULLETINS

Service
Edition: 02 2 -1accuSpin1R
17.11.03 He/Ha
2Service
2.1 Servicing Schedule (Yearly Procedure)
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 (15 Amps slow blow characteristic)
•check condition of plug and wall socket -replace defective parts
•check cord condition and fixing -replace or refit it
2.1.1.2 Location and Mechanical Installation
•check the base (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
•check the levelling of the centrifuge -use a spirit level
2.1.1.3 Lid Locking Mechanism and Safety Device
•connect the centrifuge to power and switch ON
•check for easy lid closing and self-acting lid opening -if in disorder, readjust lid looped
hook and/or hinges and smear hook slightly with grease
•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 Cover
•open the lid and remove the rotor (for loosening turn 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 motor bearing or electronics,
remove fluids with an injector and/or absorbent paper
2.1.1.5 Rotor and Bucket Condition and Sealing
•check the condition of rotor and buckets (especially all supporting or stressed partitions
•as jib arms, rim of bearing surface etc.): the rotor and/or buckets must not be used any
longer, if there are visible traces of mechanical damage or rust
•check the condition of rotor and/or bucket sealing and replace in case of malfunction
2.1.1.6 Rotor Fixing and Motor Shaft
•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 motor shaft: the centrifuge must not be used any longer, if the
motor shaft is damaged
•the thread should be greased a little
2.1.1.7 Temperature Control Circuit
•check the air inlet slots in the front panel, at the side walls of the casing and at the rear
panel for free ventilation, insufficient air flow will lead to an inadmissible temperature
rise of compressor, motor and electronic parts
•clean the condenser with a vacuum cleaner, insufficient air flow will lead to an
inadmissible temperature rise of compressor, motor and electronic parts

Service
Edition: 02 2 -2accuSpin1R
17.11.03 He/Ha
2.1.1.8 Imbalance Behaviour
•install available and empty rotors and check the imbalance behaviour with rotor
dependant cut off and run through weights and replace worn out motor rubber mounts,
the motor if required or adjust the imbalance switch
2.1.2 Maintenance Routine after Dismantling the Centrifuge Casing (see Section 5)
2.1.2.1 Motor Supporting Elements
•check the supporting and damping motor elements and replace them at least every 3
years. We recommend a yearly change. A maintenance kit is available
2.1.2.2 Imbalance Switch
•check the function of the imbalance switch and if necessary readjust it (adjusting
procedure see 2.4)
2.1.2.3 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
2.1.2.4 Ventilation and Proper Air Flow
•check the function of all fans (parallel cut in and out) and the air flow direction (to motor
and condenser from outside)
•check the air inlet slots in the casing and at the rear panel for free ventilation, insufficient
air flow will lead to an inadmissible temperature rise of compressor, motor and
electronic parts
2.1.2.5 Lead and Screwing Connections
•check the terminal and plug connections of leads on all boards and electrical
components and replace defective parts
•check the screwing connections of boards, mechanical and electrical components and
re-tighten them if necessary
2.1.2.6 Protection Earth Core and Grounding Connections
•check the protection earth core for continuity and all grounding plug connectors (see
also 2.6 Electrical Safety Check)
•check insulation resistance and leakage current (see 2.6)

Service
Edition: 02 2 -3accuSpin1R
17.11.03 He/Ha
2.2 Trouble Shooting
Error
Indication Error Cause Possible Error Source Corrective Procedure
Mains fuse or circuit
breaker failed Check fuse or circuit breaker and replace or switch on again
Faulty mains cord or
instrument socket Check instrument cord and socket, replace defective parts
No mains
voltage supply
Unit fuse or fuses on
the main board
defective
Replace it, if fuses blows again, search for
other faults
Faulty connection
from CPU to
indication board Check connectors on CPU, indication board
and connecting leads
No low voltage
supply for
indication board
Faulty indication or
CPU board Replace main board completely
Displays
remain
dark
Interrupted
program
NV-RAM out of
socket or not
correctly placed
Insert the valid NV-RAM and push it correctly
into socket
Reduced voltage
supply (>10%)
Remedy the failure
if the voltage drops often, use a voltage
stabiliser
All display
elements
are shortly
illuminated
CPU program
reset may be
caused by EMI
Bad or missing
ground connection Check all ground connections and the ground connection of all boards
Constant Interruption Parameter NV-RAM
No or defective NV-RAM
Wear out of motor
rubber mount
Replace motor rubber mounts (at least every
three years)Mechanics Motor bearings Replace motor completely
Defective terminal
connection, faulty
lead or motor winding
Check voltage on motor terminal and winding
resistances -see test points on boards
Drive makes
noises -no
good
separation
result Electrical
Faulty power electr. Replace main board
Missing mains
voltage Remedy see above, manual opening cord in bottom plate
PTC resistor has
released After a waiting time of 2 minutes press key again
Lid solenoid is
not sufficiently
supplied with
voltage
Faulty driving or triac
circuit Replace the complete main board
Faulty lid coil Faulty winding of coil Replace complete lid lock device
Lid bolt is jamming Push lid centrally into lock and press the key
again
Lid
cannot be
opened
by key at
standstill
->“E-17“ Lid is not
correctly locked
Lid is de-adjusted Re-adjust the lid centrally
Lid was opened
manually during
run
FORBIDDEN!
Forbidden
intervention
emergency opening
device must only be
used at standstill
Close lid immediately
Pull and plug in power cord again, press start
key to continue run, press stop key to finish
run
Lid switches or leads
are interrupted
Check leads and connectors to micro switch,
in case of a faulty micro switch, replace lid lock
device completely
After cooling down check temperature switch
with ohmmeter
Check ventilation (fans) and proper air flow
“Lid“
appears in
speed
display
15V low voltage
supply for
frequency
converter via the
lid switches and
motor over-
temperature
switch is
interrupted
during run
Motor over
temperature switch
has tripped,
blocked air flow to
the motor
only two phases are
controlled to the
motor
Check terminal connection XM and motor
windings -approx. 11,5 Ohm between
conductors -replace defective parts

Service
Edition: 02 2 -4accuSpin1R
17.11.03 He/Ha
Trouble Shooting (continued)
Error
Indication Error Cause Possible Error Source Corrective Procedure
Leads to lid switches
interrupted or a
defective lid switch
Check leads and connectors to micro switch, in
case of a faulty micro switch, replace lid lock
device completely
Leads to motor over-
temperature switch
are interrupted
Check the motor over-temperature switch and
leads for continuity, replace faulty parts (motor)
„OPEn“
appears in
speed
display by
supposed
closed lid
15V low voltage
supply for
frequency
converter via the
lid switches and
motor over-
temperature
switch is
interrupted
at standstill
15V low voltage
supply on the main
board is defective Replace the main board
Rotor not
symmetrically loaded
Open lid, check rotor loading, close lid again
and restart
Base is not sturdy
enough and comes
into vibrations
Change or reinforce the base (table, lorry with
lockable wheels, etc.)
Trunnions are not
greased Grease the trunnions
Rotor itself has
imbalance Rotor must no longer be used, send back to factory
Imbalance run
Rotor fixing or drive
shaft is damaged Centrifuge must no longer be used, replace nut or drive
Leads to imbalance
switch are
interrupted Check leads with ohmmeter and replace if
faulty
Faulty imbalance
switch Check the calibration of the imbalance switch
"bAL"
message
alternates
with speed
values
Signal fault
Faulty imbalance
circuit component Replace the main board
Imbalance switch Check the imbalance switch adjustmentimbalance
but no
“bAL“
message
No imbalance
cut-off Circuits of main
board Replace the main board

Service
Edition: 02 2 -5accuSpin1R
17.11.03 He/Ha
2.3 Error Codes
Error
Indication Error Cause Possible Error Source Corrective Procedure
Rotor is jammed Check for easy movement, remove jamming
objects if requiredRotor didn’t turn
Motor is jammed Replace the motor
Missing speed
signal test:
Turn rotor by
hand, then close
the lid
Faulty plug or lead
connection to speed
detection board
Check plug contacts and leads, measure speed
signal on XW1/3, replace defective parts
Faulty processing
circuit Replace main board
Connections motor to
power electronics Check plug contacts and leads, replace defective parts
Motor windings Replace the motor
“E-00“
message
appears in
speed
display
Motor didn’t start
Driving circuit, FETs Replace the main board
Bad ground connect.
Emi troubles Check all ground connections tighten loose screws
Replace the CPU
“E-02“
message
Program
sequence was
disturbed Internal program
error Replace the main board
“E-03“
message Missing speed signal See “E-00“ See “E-00“
PT100 sensor,
connecting lines or
plug connection
Resistance test at ϑsoll=20°C:
100Ω: -> display: (-1±1)°C
120Ω: -> display: (50±1)°C
“E-04“
message
Faulty measuring
of temperature
values Defective circuit Replace the main board
Data lines or
soldering connections
Check lines and soldering points, replace faulty
parts
CPU is defective CPU exchange
Faulty key board Replace the main board
„E-06“
message
Data lines to key
board were
disturbed Faulty main board Replace the main board
Compressor didn’t
work Check leads, terminals, start relay, capacitor, compressor
„E-07“
message
Chamber over-
temperature:
display >50°C Faulty cooling cycle
refrigerant loss Search for leakage and close it, evacuate and refill with new refrigerant
Defective leads or
brake resistor Check leads and brake resistor, replace defective parts
„E-08“
message
Over-voltage of
intermediate
circuit Driving and/or
braking circuits Replace the main board
„E-10“
message NV-RAM is not initialised Initialising of NV- RAM is not valid check NV-RAM and socket, insert the correct NV-RAM
„E-11“
message NV-RAM is faulty
no data transfer from
NV-RAM to CPU replace the NV-RAM
„E-12“
message faulty temp. measuring frequency of U/F converter out of limit check sensor (see E-04) replace the main board
„E-15“
message checksum error
NV-RAM is wrong or
defective replace NV-Ram and insert correctly into socket
„E-16“
message program interruption CPU disturbed or defective replace CPU and /or eliminate disturbance
Lid is blocked or
jammed
Press lid centrally in front down again, re
-
adjust if
necessary
Defective micro
switch or lid lock Replace lid lock device
„E-17“
message,
lid didn’t
open
Micro switch
does not open
after pressing lid
Faulty driving circuit Replace the main board

Service
Edition: 02 2 -6accuSpin1R
17.11.03 He/Ha
Error Codes (continued)
Error
Indication Error Cause Possible Error Source Corrective Procedure
Rotor #3455 is
selected but an other
rotor is physically
installed
Install the selected rotor or select the Cat. No. Of
the installed rotor
„E-18“
message
Set rotor is
#3455: drive is
cut out in speed
range from 0 to
1000rpm Set speed is too low
programmed,
1000rpm or below
Increase the set speed to min. 1100rpm Select
the normal acceleration with the “brake” key
Wrong NV-RAM Replace the correct NV-RAM
„E-19“
message
Wrong key board
indication Wrong key board
(incl. / without cooling)
is installed Replace the correct key board
Replace NV RAM
“E-20”
message
NV RAM doesn’t
match to CPU Wrong NV RAM or CPU Replace CPU
Replace motorFaulty motor or main
board Replace main board
„E-21“
message Acceleration too low Big Imbalance Remedy the imbalance
Wrong NV-RAM Replace the correct NV-RAM
„E-22“
message
NV-RAM and
CPU didn‘t
match Wrong CPU Replace the correct CPU

Service
Edition: 02 2 -7accuSpin1R
17.11.03 He/Ha
2.4 Test Points
2.4.1 Test Points 120V models
Test Points Unit Value Conditions
Mains terminal
XN 120 V AC All given values are related on 120V (±10%) mains voltage for
board’s supply
80 V AC
135 V AC
230 V AC
Rotor #3450 / buckets #3451
1.000 rpm
2.000 rpm
4.000 rpm
75 V AC
180 V AC
250 V AC
Rotor #3454
1.000 rpm
3.000 rpm
6.000 rpm
Terminal XM
Motor voltage
measured
inter 2 motor
leads after
reaching s
elected
speed (min. 2
minutes running
time at the
selected speed)
175 V AC
245 V AC
250 V AC
Rotor #3455
3.000 rpm
6.000 rpm
15.000 rpm
Split-core transformer and True RMS-Multimeter
3 * 1,9A Rotor #3450 with buckets #3451 / Set speed = 4.300rpm
3 * 1,5A Rotor #3454 / Set speed = 6.000rpm
Motor current IM
cable (1,2,3)3 * 0,7A Rotor #3455 / Set speed = 15.000rpm
330 V DC
360 V DC At standstill During braking phase
305 V DC
295 V DC
Rotor #3450 / buckets #3451
Set speed = 4.000rpm
Shortly by max. Acceleration
310 V DC
295 V DC
Rotor #3454
Set speed = 6.000rpm
Shortly by max. Acceleration
Intermediate circuit
voltage UDinter
U+
(cathode of
rectifying diode
V07) and U-
(current control
resistor R18)
315 V DC
300 V DC
Rotor #3455
Set speed = 15.000rpm
Shortly by max. Acceleration
135 mV DC
260 mV DC
-40 mV DC
Rotor #3450 / buckets #3451
Set speed = 4.000rpm
Shortly by max. Acceleration
Shortly during braking phase
125 mV DC
250 mV DC
-50 mV DC
Rotor #3454
Set speed = 6.000rpm
Shortly by max. Acceleration
Shortly during braking phase
Current of
intermediate
circuit
through control
resistor R18
measured as
voltage drop:
U = I x R
90 mV DC
200 mV DC
-20 mV DC
Rotor #3455
Set speed = 15.000rpm
Shortly by max. Acceleration
Shortly during braking phase
Motor winding
resistance 20°C
-insulation value
3x4,7Ω
> 10MΩ
Switch OFF unit, pull off motor plugs, measure inter 1 -> 2, 2 -> 3,
3 -> 1
resistance inter each phase and motor casing
Plug XA
Lid micro switches
15V DC Voltage drop across switch by open lid
Terminal XB
Over temperature
switch motor 15V DC By closed lid and one disconnected lead
Terminal XC
Resistance of lid
solenoid 34,5ΩSwitch OFF unit, resistance at 20°C
Terminal XD
Brake resistor 150ΩSwitch OFF unit, resistance at 20°C

Service
Edition: 02 2 -8accuSpin1R
17.11.03 He/Ha
Test Points 120V models (continued)
Test Points Unit Value
Conditions
Plug XE
Imbalance switch-
voltage drop
Inter pin 1 and 4
6,6 V DC
12 V DC
0,1 V DC
12 V DC
Plug inserted
Plug removed
Switch connected (plug re-inserted)
If lead is interrupted
Terminal XG
Compressor
terminal box
-insulation value
1Ω
4Ω
5Ω
> 10MΩ
Switch OFF unit, compressor temp. 20°C
Resistance 14 -12
Resistance 14 -13
Resistance 12 -13
Resistance inter phase and motor casing
Terminal XK
Fans
220Ω
385Ω
Switch OFF unit, resistance at 20°C
Fan for motor
Fan for electronic
Plug XU
Temp. measuring
115mV
103mV
125mV
Chamber temperature 20°C (PT100: ≈108Ω)
Chamber temperature -10°C (PT100: ≈96Ω)
Chamber temperature 40°C (PT100: ≈116Ω)
Plug XW
Speed detection -
voltage drop
Inter pin 3 and 1
Inter pin 3 and 2
12,0 V DC
1,3 V DC
0,5 V DC
10,5 V DC
Plug removed
Diode voltage (plug re-inserted)
Transistor is cut in (slot position)
Transistor is cut out

Service
Edition: 02 2 -9accuSpin1R
17.11.03 He/Ha
2.4.2 Test Points 230V models
Test Points Unit Value Conditions
Mains terminal
XN 230 V AC All given values are related on 230V (±10%) mains voltage for
board’s supply
80 V AC
135 V AC
230 V AC
Rotor #3450 / buckets #3451
1.000 rpm
2.000 rpm
4.000 rpm
75 V AC
180 V AC
250 V AC
Rotor #3454
1.000 rpm
3.000 rpm
6.000 rpm
Terminal XM
Motor voltage
measured
inter 2 motor
leads after
reaching selected
speed (min. 2
minutes running
time at the
selected speed)
175 V AC
245 V AC
250 V AC
Rotor #3455
3.000 rpm
6.000 rpm
15.000 rpm
Split-core transformer and True RMS-Multimeter
3 * 1,9A Rotor #3450 with buckets #3451 / Set speed = 4.300rpm
3 * 1,5A Rotor #3454 / Set speed = 6.000rpm
Motor current IM
cable (1,2,3)3 * 0,7A Rotor #3455 / Set speed = 15.000rpm
325 V DC
345 V DC At standstill During braking phase
310 V DC
295 V DC
Rotor #3450 / buckets #3451
Set speed = 4.000rpm
Shortly by max. Acceleration
310 V DC
295 V DC
Rotor #3454
Set speed = 6.000rpm
Shortly by max. Acceleration
Intermediate circuit
voltage UDinter
U+
(cathode of
rectifying diode
V07) and U-
(current control
resistor R18)
315 V DC
300 V DC
Rotor #3455
Set speed = 15.000rpm
Shortly by max. Acceleration
125 mV DC
260 mV DC
-40 mV DC
Rotor #3450 / buckets #3451
Set speed = 4.000rpm
Shortly by max. Acceleration
Shortly during braking phase
115 mV DC
230 mV DC
-50 mV DC
Rotor #3454
Set speed = 6.000rpm
Shortly by max. Acceleration
Shortly during braking phase
Current of
intermediate
circuit
through control
resistor R18
measured as
voltage drop:
U = I x R
125 mV DC
230 mV DC
-20 mV DC
Rotor #3455
Set speed = 15.000rpm
Shortly by max. Acceleration
Shortly during braking phase
Motor winding
resistance 20°C
-insulation value
3x4,7Ω
> 10MΩ
Switch OFF unit, pull off motor plugs, measure inter 1 -> 2, 2 -> 3,
3 -> 1
resistance inter each phase and motor casing
Plug XA
Lid micro switches
15V DC Voltage drop across switch by open lid
Terminal XB
Over temperature
switch motor 15V DC By closed lid and one disconnected lead
Terminal XC
Resistance of lid
solenoid 140ΩSwitch OFF unit, resistance at 20°C
Terminal XD
Brake resistor 150ΩSwitch OFF unit, resistance at 20°C

Service
Edition: 02 2 -10 accuSpin1R
17.11.03 He/Ha
Test Points 230V models (continued)
Test Points Unit Value
Conditions
Plug XE
Imbalance switch-
voltage drop
Inter pin 1 and 4
6,6 V DC
12 V DC
0,1 V DC
12 V DC
Plug inserted
Plug removed
Switch connected (plug re-inserted)
If lead is interrupted
Terminal XG
Compressor
terminal box
-insulation value
3,8Ω
14,2Ω
18Ω
> 10MΩ
Switch OFF unit, compressor temp. 20°C
Resistance 14 -12
Resistance 14 -13
Resistance 12 -13
Resistance inter phase and motor casing
Terminal XK
Fans
925Ω
1695Ω
Switch OFF unit, resistance at 20°C
Fan for motor
Fan for electronic
Plug XU
Temp. measuring
115mV
103mV
125mV
Chamber temperature 20°C (PT100: ≈108Ω)
Chamber temperature -10°C (PT100: ≈96Ω)
Chamber temperature 40°C (PT100: ≈116Ω)
Plug XW
Speed detection -
voltage drop
Inter pin 3 and 1
Inter pin 3 and 2
12,0 V DC
1,3 V DC
0,5 V DC
10,5 V DC
Plug removed
Diode voltage (plug re-inserted)
Transistor is cut in (slot position)
Transistor is cut out

Service
Edition: 02 2 -11 accuSpin1R
17.11.03 He/Ha
2.5 Imbalance Behaviour
•Install in table available rotor(s) in unloaded condition
Rotor Run through weight Cut off weight
75003450 with 75003451 approx. 10g approx. 50g
•Insert rotor dependent cut-off weights and position them at angles of 90° to each other,
the centrifuge must stop 4 times indicating “bAL“ message -in case of false behaviour
see trouble shooting: no “bAL“ indication
•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 carefully with a knife or similar tool the crusted 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
The louvers between the condensers’ heat air deflectors have to be vacuum cleaned. 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. Bent heat air
deflectors have to be realigned correctly

Service
Edition: 02 2 -12 accuSpin1R
17.11.03 He/Ha
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 mO
•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 MO
•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 accordanceEN61010, IEC1010 and UL3101 such a fault
condition can be reproduced by the following measuring circuit.
500 Ω
±1%
L (N)
N (L)
PE
10k Ω
±5%
0,022µF
±5% V
AC
0,22µF
±5%
Steckergehäuse / plug-in casing
Spezifaktionen für Meßgerät
- TRMS, DC - 5kHz oder mehr
- Eingangswiderstand > 1M
- Toleranz 5% oder besser
- Crest Faktor 5 oder besser
Ω
Specifaction for the meter
- TRMS, DC - 5kHz or more
- Input resistance > 1M
- Tolerance 5% or better
- Crest Factor 5 or better
Ω
Körperstrom:
accessible current: I [mA] = U [mV] / 500:
U = 1750mV I = 3,5mA
maxmax
≡

Functional Description
Edition: 02 3 -1accuSpin1R
17.11.03 He/Ha
3Functional Description
3.1 Block Functions
The accuSpin1R is a refrigerated, microprocessor controlled low speed laboratory
centrifuge with maintenance-free induction drive motor. The unit is constructed as bench top
model with an extensive range of accessories.
The centrifuge is build on a low vibration solid polymer bottom plate, the housing is made of
sheet steel and surrounds the bottom plate completely. The front panel is made of a
resistant plastic material where a easy cleanable overlay is self-glued. Housing and front
panel are fixed tightly together to the bottom plate.
The rotors are started directly with a frequency controlled main maintenance-free induction
drive with high acceleration power. The drive is mounted with shock absorbers to the bottom
plate and sealed with a rubber flange to the rotor chamber.
The unit is equipped with a compressor plant filled with CFC-free refrigerant for temperature
control.
Following boards and components are located inside the unit (see block diagram page 4-1):
•Mains switch
•Main board with central processor and 2 fuses for board protection, one fuse for the
compressor
•Indication board with key and display processor
•Three phase induction drive motor with an integrated thermal over-temperature switch
(cut-out at 140°C).
•Speed detection board is mounted underneath the drive motor
•Imbalance switch with adjustable distance screw directed to the insulated contact plate
which is mounted onto the drive motor
•Lid lock assembly with solenoid and 2 integrated micro switches
•Brake resistor mounted on a heat protection plate
•Temperature Sensor PT100 is fixed thermally insulated with a plastic clip onto a distance
bushing inside the spin chamber
•Refrigeration unit (one phase induction drive motor with starting and running capacitor -
controlled by a starting relay)
•Fans for cooling the motor / electronic components and the condenser of cooling unit

Functional Description
Edition: 02 3 -2accuSpin1R
17.11.03 He/Ha
3.2 Main Board Functions
The main board is mounted on a metal plate behind the front panel. The components on
main board are arranged in following groups (see wiring diagram page 4-2 and 4-3)
•Board fusing (2x 15 Amps. slow blown)
•Mains voltage supply for compressor control relay K1 , fuse 15A slow blown
•Noise Filter for suppression of radio interference, caused by the fast switching power
electronics (10 kHz), in accordance EN 55011 B.
•Power pack for 3 different low voltage levels and integrated protection circuit
•Triac control circuit for lid solenoid (release magnet)
•Mains rectifier for DC intermediate circuit supplying brake control path and frequency
converter
•Micro controller (central processor unit) with circuits of imbalance and speed detection
and temperature control
3.2.1 Power Pack
The power pack consists of a transformer with 2 different secondary coils, each connected to
bridge rectifiers and voltage regulators for the following low voltage levels:
1) U1 = 5V: supplies central processor, key and indication board and circuit for
temperature measuring
reference potential A1: protective conductor (GND)
2) U2 = 12V:supplies the circuits of speed measuring and imbalance detection
reference potential A2
U3 = 15V: stabilized -for the protection circuit: lid open, motor overtemperature and
for control electronics of frequency converter
reference potential A3! mains potential!
EXERCISE CAUTION when measuring etc
3.2.2 Intermediate Circuit with Brake Chopper and Frequency Converter
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 mains rectifier and two connected reservoir capacitors
which are softly charged, continuously supplied during operation and slowly discharged after
power off.
•Brake Chopper
Electrical power is feed back into the intermediate circuit during motor deceleration
(motor acts as generator). This braking power is transformed into heat by brake resistor
R1 (terminal XD) so that the intermediate circuit voltage does not rise to an excessive
level (level remains approximately constant see test points on main board). The brake
resistor R1 is switched into the intermediate circuit by a fast switching (chopping)
transistor. This transistor is controlled by the CPU via optical coupler stage.

Functional Description
Edition: 02 3 -3accuSpin1R
17.11.03 He/Ha
Main Board Functions (continued)
•Frequency Converter
The motor is provided 3-phased with chopped direct voltage blocks. These blocks are
variable in frequency and pulse width modulation and are dephased to 120° between the
motor windings. Beginning with low frequency and small pulse width chopped blocks,
both parameters will be increased up to the operators set speed. By this variation the
acceleration power of the drive motor can be effected. For deceleration the frequency
and pulse width parameters will be reduced. The frequency converter is protected
against over current and over voltage.
3.2.3 Micro Controller (Central Processing Unit)
The controller block includes the central processor unit (CPU) 87C51FB and the data
storage (NV-RAM) 9366 with the software identification No. for:
•CPU: 0498 (second displayed No. in speed field)
•RAM: 4599 (third displayed No. in speed field)
The second parts of these No.'s (displayed in the time field) will be upgraded if necessary.
The ROM with control program is integrated in the CPU. The most important operating
parameters (e.g. the maximum data or the last operator settings) are stored in the NV-RAM.

Functional Description
Edition: 02 3 -4accuSpin1R
17.11.03 He/Ha
3.3 Key and Indication Board
The key and indication board is mounted behind the front panel. A special micro controller
is located on this board controlling the 7-segment displays, the control key LED’s and the
operating keys.
The communication with the central processor on the main board takes place via serial data
lines in both directions (plug XI).
Functions of keys elements
Keys Designation Function(s)
S6 Decel Setting of brake profile
S7 Speed ⇓decrement of speed setting
S8 Speed ⇑Increment of speed setting
S9 Bucket Setting of bucket code
S10 Rpm/rcf Change between speed and g-force
S11 Time ⇓Decrement of time setting
S12 Time ⇑Increment of time setting
S13 Temp ⇓Decrement of temp setting
S14 Temp ⇑Increment of temp setting
S16 Quick run Pulse function while button pushed
S17 Open Push for lid opening
S18 Start Press for starting the run
S19 Stop Press for stopping the run
Functions of Indicating Elements
Indicatio
nDesignation Function(s)
H04-
H07,
H12 Speed range
Speed in rpm (rounded to full 10 rpms)
Rcf-value (xg)
Brake cut off point
Rotor or bucket no.
Identifications no.’s of controller and nv-rams,
Lid open condition („open")
Centrifuge run is terminated („end")
Error message („lid“, „E-xx“)
H13-H15 Time range Centrifugal time in min (count down process)
Count up process (hld) in min (count up process)
Actual version number („xx“)
H18 LED RPM Display shows the speed
H22 LED rcf Display shows the g-force
H19,
H20,
H24;
H25
LED circle Active when rotor spinning
H16,
H17, temp-range Temperature in °C
H1 Buzzer Active when error comes up or at the end of a run

Functional Description
Edition: 02 3 -5accuSpin1R
17.11.03 He/Ha
3.4 Speed Detection Board
The speed detection takes place opto-electronically through a slot in the motor shaft.
A light-emitting infra-red diode and a photo-transistor are mounted on the speed detection
board and located on opposing sides of the motor shaft (see page 4-9).
So 2 pulses per motor revolution are generated, by which the micro controller calculates the
real rotor speed or rcf value. The speed detection board is connected to the main board via
the 3-pin plug XW.
3.5 Cooling Unit with Capillary Injection
3.5.1 Refrigerant
•Type R134a
•Amount 350 g
3.5.2 Functional Description
The cooling unit consists of following components:
•Compressor power relay
•Starting relay with starting capacitor
•Compressor with connection box for starting relay
•Condenser (with radial fan)
•Drier cartridge and capillary tube
•Evaporator coil integrated in the armoured spin chamber
•Temperature Control
The set temperature range is defined from 0°C to 40°C. In dependence of the set values
of rotor and temperature and the real speed value the CPU calculates the correct
temperature level inside the closed spin chamber.
When the correct temperature level is reached, the CPU controls it by switching the
compressor with aid of relay K1 (mounted on main board) ON and OFF.
The shortest compressor cut-out phase is 60 sec.
After the end of the pre-tempering phase (see section 1 -operating instructions -chapter
9) the indicated temperature is approx. the same as the temperature of rotor, buckets
and accessories (allowed tolerances ±2°).
•Cooling System
The evaporator absorbs the heat energy from the rotor chamber, the condenser emits
the heat energy subsequently via the casing louvers to the room (tangible heat flow).
The expansion part (capillary tubes) provides the necessary pressure drop and supplies
the evaporator spiral tube with liquid refrigerant.

Functional Description
Edition: 02 3 -6accuSpin1R
17.11.03 He/Ha
3.5.3 Suction Pressure Test
•Dismantle the front panel (see section 5, page 1)
•Screw pressure gauge onto measuring nozzle (suction side on compressor) inflation
pressure (pressure balance after longer standstill) approx. 3 bar at ambient temperature
•Set temperature to 0°C and start
•Reading of suction pressure after 2 min. is approx. 0.5 -0.8 bar
3.5.4 Component Parts of Unit (listed in flow direction)
•compressor with Schrader valve (low-pressure side)
•condenser with radial fan
•dryer cartridge
•capillary tube (not interchangeable)
•evaporator integrated in the spin chamber
•suction line