OHAUS Frontier FC5706 Service Manual

SERVICE MANUAL
FC5706 CENTRIFUGE
Ohaus Corporation 7 Campus Drive, Suite 310, Parsippany, NJ 07054, USA +1 973 377 9000
TABLE OF CONTENTS
Page No.
CHAPTER 1 GETTING STARTED
1.1
1.2
1.3
Introduction ..............................................................................................................1-1
Definition of Signal Warning and Symbol .................................................................1-1
Safety Precaution .....................................................................................................1-2
1.3.1 User ................................................................................................................1-2
1.3.2 Rotor and Accessories ....................................................................................1-2
1.3.3 Measures of your protection ............................................................................1-2
1.3.4 Exclude the Following environment Influence ..................................................1-3
1.3.5 Measures for Operation Safety ........................................................................1-3
1.3.6 Danger & Precaution ...................................................................................... 1-3
1.4 Service Facilities ......................................................................................................1-4
1.5 Tools and Test Equipment's Required......................................................................1-4
1.5.1 Tools and Test Equipment's Required .............................................................1-4
1.6 Transport and packing of FC5706 ............................................................................1-5
1.6.1 Transport.........................................................................................................1-5
1.6.2 Packing ...........................................................................................................1-5
1.7 Technical Data .........................................................................................................1-5
1.7.1 Acceleration and Deceleration Times FC5706.................................................1-5
1.7.2 Imbalance Shut Off Data FC5706....................................................................1-5
1.7.3 Specifications ..................................................................................................1-6
1.8 Service Instructions ..................................................................................................1-7
1.8.1 General Technical Descriptions .......................................................................1-7
1.8.2 Electrical and Electronic Components .............................................................1-9
1.8.2.1 Control Board .......................................................................................1-9
1.8.2.2 Rotor Recognition ...............................................................................1-10
1.8.2.3 Speed Signal ......................................................................................1-10
1.8.2.4 Lid Mechanism ...................................................................................1-10
1.8.2.5 Imbalance Detection ...........................................................................1-11
1.9 LCD Display ...........................................................................................................1-12
1.10 Function Label .......................................................................................................1-13
CHAPTER 2 SERVICE MENU
2.1
2.2
Service Menu ...........................................................................................................2-1
2.1.1 Activation of the Service Menu (Part 1) ...........................................................2-1
2.1.2 Submenu Motor Start ......................................................................................2-2
2.1.3 Submenu Duty Cycle.......................................................................................2-2
2.1.4 Submenu Running Time ..................................................................................2-3
2.1.5 Submenu Software Status ...............................................................................2-3
2.1.6 Submenu Error Memory ..................................................................................2-4
2.1.7 Submenu Keyboard Test .................................................................................2-5
2.1.8 Submenu Activation/Deactivation of the Imbalance Sensor .............................2-5
Activation of the Service Menu (Part 2) ....................................................................2-6
2.2.1 Centrifuge Model .............................................................................................2-7
2.2.2 Submenu Adjustment/Correction of the Imbalance Cut Off Value....................2-7
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TABLE OF CONTENTS
CHAPTER 3 MAINTENANCE PROCEDURES
3.1
3.2
3.3
3.4
3.5
3.6
Page No
Preventive Maintenance ...........................................................................................3-1
3.1.1 General ...........................................................................................................3-1
3.1.2 Cleaning and Disinfection of the Unit ...............................................................3-2
3.1.3 Cleaning and Disinfection of the Rotor ............................................................3-2
3.1.4 Disinfection of Aluminum Rotor .......................................................................3-3
3.1.5 Disinfection of PP-Rotor ..................................................................................3-3
3.1.6 Glass Breakage...............................................................................................3-4
Service Life of Rotors, Round and Rectangular Buckets, Accessories .....................3-4
Mounting Support .....................................................................................................3-5
3.3.1 Replacing the Front Housing ...........................................................................3-5
3.3.2 Replacing the Incremental Shaft encoder (Potentiometer)...............................3-5
3.3.3 Replacing the Display......................................................................................3-6
3.3.4 Replacing the Foil Key Board ..........................................................................3-7
3.3.5 Removing the Housing ....................................................................................3-7
3.3.6 Replacing the Rotor Chamber or Lid Gasket ...................................................3-8
3.3.7 Removing the Lid ............................................................................................3-9
3.3.8 Replacing the Hinges ......................................................................................3-9
3.3.9 Replacing the Motor ......................................................................................3-10
3.3.10 Replacing the Power Board/Control Board ..................................................3-11
3.3.11 Checkup the Imbalance Sensor...................................................................3-11
3.3.12 Replacing the Imbalance (movement sensor) and Speed Sensor ...............3-12
3.3.13 Replacing the Lid Lock ................................................................................3-12
3.3.14 Adjustment of the Lid ...................................................................................3-13
Major internal cable connection ..............................................................................3-14
Trouble Shooting ....................................................................................................3-16
3.5.1 Error Message: Cause/Solution .....................................................................3-16
3.5.2 Possible Error Message and Their Solutions .................................................3-16
3.5.2.1 Lid Release during Power Failure .......................................................3-16
3.5.2.2 Descriptions of the Error Message.......................................................3-17
Error Codes............................................................................................................3-18
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CHAPTER 1 GETTING STARTED
1.1
INTRODUCTION
This service manual contains the information needed to perform routine maintenance and service
on the Ohaus centrifuge model FC5706.
Before servicing the equipment, you should be familiar with the Instruction Manual which is packed
with every equipment.
1.2
DEFINITION of SIGNAL WARNING AND SYMBOLS.
Safety notes are marked with signal words and warning symbols. These show safety issues and warnings.
Ignoring the safety notes may lead to personal injury, damage to the instrument, malfunctions and false
results. The degree of danger is a part of a safety note and distinguishes the possible results of nonobservance from each other.
Signal Words
WARNING
CAUTION
Attention
Note
For a hazardous situation with medium risk,
possibly resulting in injuries or death if not
avoided.
For a hazardous situation with low risk, resulting
in damage to the device or the property or in the
loss of data, or injuries if not avoided.
For important information about the product.
May lead to equipment damage if not avoided.
For useful information about the product.
Warning Symbols
Electrical Shock Hazard
General Hazard
Alternating Current
Biohazard
Explosion Hazard
Corrosive Hazard
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CONTENT
Warning and information signs on the surface of centrifuge.
1.3
SAFETY PRECAUTIONS.
1.3.1 User
OHAUS centrifuges are intended exclusively for indoor use and for use by qualified personnel. This device
may only be operated by trained specialist staff. They must have carefully read the operating manual and be
familiar with the function of the device.
1.3.2 Rotor and Accessories
Only OHAUS original rotors and accessories shall be used. Any other use or intended use is considered
improper. OHAUS is not liable for damage resulting from improper use.
CAUTION:
Read all safety warnings before installing, making connections, or servicing this equipment.
Failure to comply with these warnings could result in personal injury and/or property
damage. Retain instructions for future reference.
1.3.3 Measures for your protection
WARNING: Never work in an environment subject to explosion hazards! The
housing of the instrument is not gas tight. (Explosion hazard due to spark
formation, corrosion caused by the ingress of gases)
WARNING: When using chemicals and solvents, comply with the
instructions of the producer and the general lab safety rules.
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CHAPTER 1 GETTING STARTED
WARNING: The centrifuge is not sealed. Use suitable protection measures
when using the centrifuge for infectious and pathogenic samples. Follow
appropriate safety precautions when handling these samples.
1.3.4 Exclude the following environmental influences

Powerful vibrations

Direct sunlight

Atmospheric humidity greater than 80%

Corrosive gases present

Temperatures below 2 °C and above 35 °C

Powerful electric or magnetic fields:
WARNING:
Electrical shock hazards exist within the housing. The housing should only be opened
by authorized and qualified personnel. Remove all power connections to the unit before
opening.
1.3.5 Measures for operational safety
 Do not unscrew the two halves of the housing

Dry off any liquid spills immediately! The instrument is not watertight

Only use a power cord with a rating that exceeds the specifications on the equipment label.

Only connect the power cord to a properly grounded power receptable.

Do not position the equipment such that it is difficult to disconnect the power cord from the power
receptacle.

Make sure that the power cord does not pose a potential obstacle or tripping hazard.

The equipment is for indoor use only. Use the equipment only in dry locations.

Use only approved accessories.

Operate the equipment only under ambient conditions specified in these instructions.

Disconnect the equipment from the power supply when cleaning.

Do not operate the equipment in hazardous or unstable environments.

Service should only be performed by authorized personnel
1.3.6 Danger and precautions
To protect people and the environment the following precautions should be observed:

During centrifugation, the presences of people are prohibited within 30 cm around the centrifuge
according to the regulations of EN 61010-2-020.

FC5706 is not explosion-proof and must therefore not be operated in explosion-endangered areas or
locations. Centrifugation of flammable, explosive, radioactive, or such substances, which

Chemically react with high energy, is strictly prohibited. The final decision on the risks associated with
the use of such substances is the responsibility of the user of the centrifuge.

Never spin toxic or pathogenic material without adequate safety precautions, i.e. centrifugation of
buckets / tubes with missing or defective hermetic sealing is strictly prohibited. The user is obliged to
perform appropriate disinfection procedures in case dangerous substances have contaminated the
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CONTENT
centrifuge and or its accessories. When centrifuging infectious substances, always pay attention to
the general laboratory precautions. If necessary, contact your safety officer!

It is prohibited to run the centrifuge with rotors other than listed for this unit.
Under no circumstances open the lid of the centrifuge while the rotor is still running or rotating with a speed of
> 2m/s
1.4
SERVICE FACILITIES
To service a centrifuge, the service area should meet the following requirements:
1.5

Area must be clean and air must not contain excessive dust particles.

Work surface must be stable and level.

Use an approved Electro-Static Device.
TOOLS AND TEST EQUIPMENT REQUIRED
1.5.1
Standard Tools and Test Equipment
1. Flat and Philip screws drivers, tweezers, adjustable open wrenches and socket set (with
drive socket sets from 4mm-14mm, Ratchet and drive extension bar.)
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CHAPTER 1 GETTING STARTED
1.6 Transporting and Packing of the Centrifuge FC5706.
1.6.1 Transport.
• Please transport the device in the original packaging.
• Use a transport aid for transporting over longer distances.
1.6.2 Packing.
Pack the centrifuge in reverse order using the equipment original packing.

1.7. TECHNICAL DATA
1.7.1 Acceleration and Deceleration times FC5706.
Rotor-number
30130880 6x5ml
30130877 12x5ml
30130878 6x50ml
Acceleration values
Deceleration values
level 0
level 9
level 0
level9
35
8
25
7
95
33
257
51
91
41
274
52
in seconds
Acceleration time
Deceleration time
-1
-1
from 0 min -> Umax
from Umax -> 0 min
1.7.2 Imbalance shut-off data FC5706 (120V / 230 V )
Rotornumber
Shut off speed (approx.
values) in rpm
Permitted imbalance in
gram
Imbalance shut-off in gram
30130877
2750
11
12
30130878
2850
10
11
30130880
2850
4
5
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CHAPTER 1 GETTING STARTED
1.7.3 Specifications.
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CHAPTER 1 GETTING STARTED
1.8
SERVICE INSTRUCTIONS
1.8.1
General technical description
The unit is equipped with several safety features:
• Imbalance detection
• Lid lock does not open until the standstill of the centrifuge
• Rotor over speed protection
After switching on the centrifuge an automatic calibration of the movement
sensor will be done.
Please follow below mentioned safety instructions for any kind of service
actions:

An equipment Redemption Form or Decontamination Certificate should be available
before servicing the equipment.

Remove all power connections to the unit before opening.

Electrical shock hazards exist within the housing. The housing should only be opened by
authorized and qualified personnel.

Do not leave units unsupervised, when parts of the housing have been removed and the
unit is still connected to the main power supply.

Do not bypass the lid’s safety contacts and never work with the unit’s lid open.

Never work in an environment subject to explosion hazards! The housing of the
instrument is not gas tight. (Explosion hazard due to spark formation, corrosion caused
by the ingress of gases)

When using chemicals and solvents, comply with the instructions of the producer and
the general lab safety rules.

The centrifuge is not sealed. Use suitable protection measures when using the
centrifuge for infectious and pathogenic samples. Follow appropriate safety precautions
when handling these samples.
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CHAPTER 1 GETTING STARTED
Equipment Redemption Form or Decontamination Certificate
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CHAPTER 1 GETTING STARTED
1.8.2 Electrical and electronic components
1.8.2.1 Control board
The control board consists of one plate. The board can only be exchanged completely. If there
is a defect you have to exchange the complete board.
All signal lines lead to the control board.
The PCB controls the entire centrifuge.
Figure 1: Control board
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CHAPTER 1 GETTING STARTED
1.8.2.2 Rotor recognition
The centrifuge will recognize the inputted rotor through the set up in the control panel. As soon
as the lid get closed the rotor number will be indicated in the speed display.
If the pre-selected rpm is higher than the permitted rpm of the rotor, the rpm pre-selection
indication will flash when starting the centrifuge.
But the regulation will accelerate the rotor only to its permitted rpm.
Do not use a rotor, which isn't set to the control panel.
1.8.2.3 Speed signal
The actual speed is extracted by a hall-effect-sensor placed on the lower side of the motor.
There is a “preset/actual "comparison in the control board. Thereupon a new “actual-signal” is
given by the control board to the converter.
Figure 2
1.8.2.4 Lid mechanism
The micro switch in the mechanism of the lid lock controls the correct closing of the centrifuge
lid.
The switch may never be bypassed.
The lid lock is unlatched by an magnet, receiving its signal from the control board.
The actual state is indicated in the display (see M1, M2).
Figure 3
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CHAPTER 1 GETTING STARTED
1.8.2.5 Imbalance detection
The imbalance detection is effected by a movement sensor, which is placed on the lower side of
the motor and is controlling the oscillating motion of the motor. The unit stopps when the
oscillating motions are too strong. Therefore you have to follow the adjustment instructions
stated by the manufacturer.
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CHAPTER 1 GETTING STARTED
1.9 LCD Display
The following picture shows the individual elements of the LCD-display.
Figure 4
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CHAPTER 1 GETTING STARTED
1.10 Function label.
The function label consists of one LCD-display, one potentiometer (8), the upper front housing
and the foil keyboard. These parts can be exchanged separate. The potentiometer (1) regulates
all parameters which are adjustable by pressing a key and which are indicated in the LCDdisplay. Inside the time display of the control panel the error message is indicated if there occur
any troubles
Figure 5
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CHAPTER 2 SERVICE MENU
2.1
SERVICE MENU
The operation menu helps the service personnel to locate defects. It is divided in two parts,
which are graded in several areas again from chapter 2.1.1 to 2.2.2.
Part 1 is accessible for the USER and different points can be read respectively settled. This is
also described in the instruction manual.
Part 2 is for internal use respectively for OHAUS trained service personnel only.
2.1.1 Activation of the Service Menu (part 1)
The menu can be started as follows:
 Open lid of the centrifuge and switch off main switch.
 Press the key „time“ (6) and „door open“ (7) hold them and at the same time switch on
the unit.
If the centrifuge is still turned off, press simultaneously the keys „time“ (6) and „lid“ (7) and turn
on the main switch of the centrifuge. Now release both keys again. As a result a display test is
executed for approx. 5 seconds
Figure 1
Now it follows a display test for about 5 seconds as shown here under in figure 8.
Now you have entered the Service mode. By pressing the key „accel/decel“ (5) you will get to
the submenus.
Now in the display “acc/dec“ (A-2) the word “service“ (M12) will flash when you press
Accel/Decel (5) and "service" will stop flashing after 5 sec. Only as long as this word is flashing,
you can scroll through the further submenus with the potentiometer (8).
You have to repeat this step continuously to enter the different submenus.
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CHAPTER 2 SEVICE MENU
2.1.2 Submenu Motor Starts
Here you can read off the number of motor starts.
 Activate the operation menu as described in chapter 2.1.1.
 Turn the potentiometer (8) until the special digit “service A “appears in the display
„acc/dec”
(A-2), see figure 9
Figure 2
In the display “rpm/rcf“ (A-1) the number of motor starts is indicated now.
2.1.3 Submenu Duty Cycle
Here you can read off the duty cycle of the unit.
 Activate the operation menu as described in chapter 2.1.1.
 Turn the potentiometer (8) until the special digit “service H“ appears in the display
“acc/dec” (A-2).
Figure 3
Inside the display “rpm/rcf“ (A-1) now the duty cycle is indicated.
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CHAPTER 2 SERVICE MENU
2.1.4 Submenu Running Time
Here you can read off the operating hours of the motor.
 Activate the operation menu as described in chapter 2.1.1.
 Turn the potentiometer until the special digit “service h“ appears in the display “acc/dec”
(A-2).
Figure 4
In the display “rpm/rcf“ (A-1) the running time of the motor is indicated now.
2.1.5 Submenu software status
Here you can read off the software status.
 Activate the operation menu as described in chapter 2.1.1.
 Turn the potentiometer (1) until the special digit ”service S“ appears in the display
„acc/dec”
(A-2).
Figure 5
In the display “rpm/rcf“ (A-1) the actual software status is indicated now.
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CHAPTER 2 SEVICE MENU
2.1.6 Submenu Error Memory
Here the last 99 occurred error messages can be indicated.
 Activate the operation menu as described in chapter 2.1.1.
 Turn the potentiometer (8) until the special digit “service E“ appears in the display
“acc/dec”
(A-2).
Figure 6
 By pressing the key „rpm/rcf“ (4) the display “rpm/rcf“ (A-1) is activated and you can
scroll through the error list with the potentiometer (8).
 Now the last 99 occurred error messages are indicated in the display “rpm/rcf“ (A-1).
Whereas the first two digits describe the place number and the last two digits do
describe the occurred error. Look at chapter 3.5 "Errors that may be indicated in the
LCD display".
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CHAPTER 2 SERVICE MENU
2.1.7 Submenu Keyboard Test
The keyboard test is used for checking the correct function of the foil keyboard.
 Activate the operation menu as described in chapter 2.1.1.
 Turn the potentiometer (8) until the special digit “service P“ appears in the display
“acc/dec“
(A-2).
Figure 7
 By pressing each key the word “PrESS“ switches from the bottom to the top line in the
display “rpm/rcf“ (A-1). The key accel/decel (5) excluded.
2.1.8 Subemenu Activation / Deactivation of the imbalance sensor
 Activate the operation menu as described in chapter 9.3.1.
 By pressing the key “accel/decel“ (5) the several sub-menus are activated.
 Turn the potentiometer until the special digit "Service u" appears in the display “acc/dec“.
In the display “rpm/rcf“ (A-1) appears the word „unbAL“.
 By pressing the key “RPM/RCF“ (4) the menu is activated. Turn the potentiometer until
the words „on“ or „off“ are indicated in the display “rpm/rcf“ (A-1).
on = imbalance sensor is activated
off = imbalance sensor is deactivated
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CHAPTER 2 SEVICE MENU
Figure 8
2.2 Activation of the Service Menu (Part 2)
To get access to the second level of the service menu you have to press the key stop (3) for
longer than one second. Now you are asked for a code in the display “rpm/rcf“ (A-2) – adjust the
code “9876“ with the potentiometer (8) and press once again the key stop (3).
Figure 9
Now you can carry out the below shown adjustments:
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CHAPTER 2 SERVICE MENU
2.2.1 Centrifuge Model
Here you can see the centrifuge models which are stored on the control board.
 Activate the operation menu as described in chapter 9.3.1.
 Activate the service menu as described in chapter 9.4.1.
 Turn the potentiometer (8) until the special digit “service t“ appears in the display
“acc/dec“ (A-2).
Examples:
Figure 10
2.2.2 Submenu Adjustment/Correction of the imbalance cut off value:
Here you can adjust or correct the imbalance cut off value. In the factory has been setup an
imbalance cut off value. With this settled value the unit should run through. Through the
transport or the setup of the unit it may occur that this value will react unlike.
In case the unit does already cut off at the adjusted value you can increase this value by
adjusting this value > 0. In case the unit does not cut off until you can decrease this value by
adjusting this value < 0. The suitable value must be settled by service personnel only.
After the correction there is another check indispensable. You have to make several tests.

Activate the service menu as described under 2.1.1 „Activation of the operation
menu (Part 1)“.

Activate the operation menu as described under 2.2 „Activation of the service menu
(Part 2)“.

Press the button "accel/decel" (5). Turn the potentiometer (8) until the special digit „n“
appears in the display "acc/dec" (A-2).
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CHAPTER 2 SEVICE MENU
Figure 11

Press the button "rpm/rcf" (4). The display "rpm/rcf" (A-1) is now activated and you can
choose the respective setup between -30 and 20 with the potentiometer (8).
Note: After all points have been reviewed and/or set up, you have to press
shortly the key "start" to store all parameters. Otherwise the setups were all for
nothing. If the storage has been successful in the display „rpm/rcf“ the value of
the imbalance sensor and the word „StorE“ are indicated.
Figure 12
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CHAPTER 3 MAINTENANCE PROCEDURES
3.1
PREVENTIVE MAINTENANCE
3.1.1 General
Care:
Maintenance of the centrifuge is confined to keeping the rotor, the rotor chamber and the rotor
accessories clean as well as to regularly lubricating the rotor insert bolts of a swing out rotor (if
available).
Lubricants containing molycote and graphite are not allowed.
Please pay special attention to anodized aluminium parts. Breakage of rotors can be caused
even by slightest damages.
In case of rotors, buckets or tube racks getting in touch with corrosive substances the
concerned spots have to be cleaned carefully.
Corrosive substances are for instance: alkalis, alkaline soap solutions, alkaline amines,
concentrated acids, solutions containing heavy metals, water-free chlorinated solvents, saline
solutions, e.g. salt water, phenol, halogenated hydrocarbons.
Cleaning – units, rotors, accessories:
-
Turn the device off and disconnect it from the power supply before you begin
any cleaning or disinfecting. Do not pour liquids into the housing interior.
-
Do not spray disinfectant on the device.
-
Thorough cleaning not only has its purpose in hygiene but also in avoiding
corrosion based on pollution.
-
In order to avoid damaging anodized parts such as rotors, reduction plates
etc., only pH-neutral Detergents with a pH-value of 6-8 may be used for
cleaning. Alkaline cleaning agents (pH-value > 8) must not be used.
-
After cleaning, please ensure all parts are dried thoroughly, either by hand or
in a hot-air cabinet (max. Temperature + 50°C).
-
It is necessary to coat anodized aluminium parts with anti-corrosion oil
regularly in order to increase their life-spans and reduce corrosion
predisposition.
-
Due to humidity or not hermetically sealed samples, condensate may be
formed. The condensate has to be removed from the rotor chamber with a
soft cloth regularly.
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CHAPTER 3 MAINTENANCE PROCEDURES
The maintenance procedure has to be repeated every 10 to 15 runs, but at
least once a week!
3.1.2
-
Connect the unit to the power supply, after the equipment is completely dry.
-
Do not carry out disinfection with UV-, beta- and gamma-rays or other high
energy radiation.
-
Metal rotors can be autoclaved.
-
Rotor lid and adapters can also be autoclaved (max. 121°C, 20 min).
-
The tube racks are made of PP and can not be autoclaved at 134°C.
Cleaning and disinfection of the unit
1.
2.
3.
4.
5.
6.
7.
8.
9.
Open the lid before you turn off the unit. Disconnect it from the power supply.
Open the rotor nut by turning the rotor key clockwise.
Remove the rotor
For cleaning and desinfection of the unit and the rotor chamber using the
above mentioned cleaner.
Clean all accessible areas of the device and its accessories, including the
power cord with a damp cloth.
Wash the rubber seals and rotor chamber thoroughly with water.
Rub the dry rubber seals with glycerol or talc to prevent these to becoming
brittle. Other components of the unit, e.g. the lid lock, motor shaft and rotor
must not be greased.
Dry the motor shaft with a soft, dry and lint-free cloth.
Inspect the unit and accessories for damage.
Remove at least every six months adherent dust from the ventilation slots in the centrifuge by
using a brush.
3.1.3
Cleaning and disinfection of the rotor
1. Clean and disinfect the rotors, rotor lids and adapters with the above
mentioned cleaner.
2. Use a bottle brush to clean and disinfect the rotor bores.
3. Rinse the rotor, rotor lid and adapter with water, especially type fixed angle
rotor holes.
4. For drying of the rotors and accessories set them on a towel. Place the angle
rotors with bores down, to dry them to.
5. Dry the rotor cone with a soft, dry and lint-free cloth and look for damage. Do
not grease the rotor cone.
6. Place the dry motor onto the motor shaft.
7.
Pull the rotor nut tight by using the rotor-key.
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CHAPTER 3 MAINTENANCE PROCEDURES
3.1.4
Disinfection of Aluminum-rotors
In case of infectious material spilling into the centrifuge, the rotor and rotor chamber have to be
disinfected right after the run. Rotors may be autoclaved at a maximum temperature of 121°C.
3.1.5
Disinfection of PP-rotors
Autoclaving
The recommended time for autoclaving: 15 – 20 min at 121°C (1 bar)
Attention: The sterilization time of 20 min. must not be exceeded.
Sterilization again and again will cause reduction of the mechanical
resistance of the plastic material
Before the autoclaving the PP-rotor and adapter must thoroughly be cleaned to avoid the
burning in of dirty residues.
You can disregard the consequences of some chemical residues to plastic materials at ambient
temperatures. But at the high temperatures of the autoclaving those residues may corrode and
destroy the plastic. The objects must be thoroughly washed up with distilled water after the
cleaning but before the autoclaving. Residues of any cleaning liquids may cause fissures,
whitening and stains.
Gassterilization
Boxes, bottles and rotors may be gassterilized with Ethylenoxyd. According to the duration of
the application you may give long enough an airing to the items after the sterilization and before
using them again.
Attention: Because the temperature may rise during the sterilization,
rotors, boxes and bottles must not be closed respectively must be totally
unscrewed
Chemical sterilization
Bottles, boxes and rotors may be treated with the usual liquid disinfectants.
Attention: Before applying a different decontamination method than
recommended by the manufacturer, contact the manufacturer to ensure
that it will not damage the unit or the rotor.
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CHAPTER 3 MAINTENANCE PROCEDURES
3.1.6
Glass breakage
With high g-values, the rate of glass tube breakage increases. Glass splinters have to be
removed immediately from rotor, buckets, adapters and the rotor chamber itself. Fine glass
splinters will scratch and therefore damage the protective surface coating of a rotor. If glass
splinters remain in the rotor chamber, fine metal dust will build up due to air circulation. This
very fine, black metal dust will extremely pollute the rotor chamber, the rotor, the buckets and
the samples.
If necessary, replace the adapters, tubes and accessories to avoid further damages. Check the
rotor bores regulary for residues and damages.
Attention: Please check the relevant specifications of the tubes centrifuges
with the manufacturer!
3.2
Service life of rotors, round and rectangular buckets, accessories
Rotors and rotor lid made of aluminium or stainless steel, have an operating life of max. 7 years
from first use.
Transparent rotor lids and caps made of PC or PP as well as rotors, tube racks and adapters of
PP have a maximum service life up to 3 years from first use.
Condition for the operating life:
Proper use, damage-free condition, recommended care.
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SERVICE INSTRUCTIONS
3.3
Mounting Support
After performing any kind of assembling work, please make sure all the grounded
contacts are connected correctly!
3.3.1 Replacing the front housing
Begin with step 3.3.5
 Remove the lower covering by putting a screw driver into the 2 notches and then lever the
front part out.
 Pull the lower edge of the covering away from the mounting plate of the housing.
 Pull the covering out of the upper guiding rails downwards.
 Remove the interface cable on the control board.
Figure 1
3.3.2
Replacing the incremental shaft encoder (potentiometer)

Remove the cap on top of the incremental shaft encoder (see figure 23).

With a socket wrench you can loosen the fastening nut. (socket wrench size
10mm)
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SERVICE INSTRUCTIONS
Figure 2

Loosen all electrical contacts to the shaft encoder on the back side of the front housing.
Figure 3
3.3.3
Replacing the display

Loosen all electrical contacts to the display on the back of the front housing.

Remove the 4 fastening screws of the display and pull away the display upwards.
remov
e
Figure 4
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SERVICE INSTRUCTIONS
3.3.4
Replacing the foil key board
Remove the incremental shaft encoder and the display.

Peel off the defective foil keyboard and clean the remaining glued joints.

Glue the new foil keyboard precisely in the recess. Make sure the foil matches precisely
and the window of the foil keyboard lies exactly over the display.

Reassemble the control panel in reversed order and mount it back in the front housing.
3.3.5
Removing the housing

Remove the control panel as described in chapter 3.3.5.

Remove all screws on the lower side of the housing.

Remove the housing upwards and remove all relevant electrical contacts on the
control board.

Reassemble the unit in reverse order.
Left side of Centrifuge
Right side of Centrifuge
Figure 5
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SERVICE INSTRUCTIONS
3.3.6
Replacing the rotor chamber or lid gasket

Grasp under the lid gasket and lift out the rotor chamber piece by piece. Take care that
the fixing ends are at the back part of the chamber (see figure 27). Start the mounting
always with this glued ends.

When mounting the rotor chamber make sure that the ventilation drilling behind on the right
points to the corner of the housing (see figure 27)

Place the new lid gasket on the plastic ring. Take care that the fixing points are at the back
of the chamber.

Reassemble the unit in reverse order.
Figure 6
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SERVICE INSTRUCTIONS
3.3.7
Removing the lid
Open the lid as wide as possible.

Hold the lid with one hand and remove the fixing screws of the hinges (see figure 28).

The lid can now be removed completely.
Fixing screws
Figure 7
3.3.8
Replacing the hinges
Remove the lid as described in chapter 3.3.7.

Lay the lid with the upper side down on a smooth under packing to avoid any scratches.

Loosen the screws of the respective hinges on the inner side of the lid and replace the
hinges.
remove
Figure 8

Reassemble the unit in reverse order.
Make sure the lid rests on the lid gasket straight and continuous. Tighten the fasting screws
firmly at the backside of the unit after the adjustment
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SERVICE INSTRUCTIONS
3.3.9
Replacing the motor

Remove the housing as described in chapter 3.3.5.

Remove the connection cable to the motor on the control board.
a) current supply of the motor
b) speed and imbalance sensor
remove
Figure 9

Turn the motor fixing screws out of the rear side of the ground plate.

Lift the motor out of the unit.

When re-assembling the spare motor, take care of the wirings, as they must not be
jammed.

Re-assemble the unit in reverse order.
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SERVICE INSTRUCTIONS
3.3.10
Replacing the power board / control board

Remove the housing as described in chapter 3.3.5.

Remove all cable connections to the control board.

Remove the four fixings screws and take the control board out.
remove
Figure 10

Put in the new control board, connect all electrical contacts and re-assemble
the unit in reverse order.
3.3.11
Checkup the imbalance sensor
Movement sensor:
•
It is possible to adjust/correct the imbalance cut off value see chapter 2.2.2.
•
Should appear any difficulties with the imbalance, please give us an exact description of it
as well as the serial number of the unit and the rotor type.
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SERVICE INSTRUCTIONS
3.3.12
Replacing the imbalance - (movement sensor) and speed sensor
• Remove the housing as described in chapter 3.5.5
• Remove the motor as described in chapter 3.3.9.
• Lay the motor down on it's side and remove the 4 fixing screws of the swinging rubber and the
two fixing screws of the green board on the rear side (look up in chapter 1.5.2.5).
• Pull off the speed magnet carefully.
Attention: Risk of breakage!
• Replace the board.
• Glue the speed magnet with super glue again in the right position and re-assemble the unit in
reverse order.
3.2.13
Replacing the lid lock
• Remove the control panel as described in chapter 3.3.5.
• Remove the electrical contact of the lid lock on the control board (see figure
31).
• Remove the string of the emergency release of the lid lock on the control board
(see figure 32).
• Remove the fixing screws on the housing and put in the new lid lock.
• Make sure that the lid rests on the lid gasket straight and continuous while fastening.
Tighten the fastening screws firmly after the replacement.
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SERVICE INSTRUCTIONS
remove
Figure 11
3.2.14 Adjustment of the lid:
1.) Lay the lid down onto the centrifuges seal. Afterwards tighten the screws of the
hinges under a slight pressure onto the lid.
2.) Put some washers underneath of the lid lock, in that way that the lid latch is
centric to the closing bar.
3.) Adjust the height of the lid lock, that the distance between the lid up to the
housing is about 8 mm to 4 mm.
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SERVICE INSTRUCTIONS
3.4 Major internal cable connection.
After performing any internal repairs it is important to check if the cable connections are
correct and all grounding is properly connected (housing and bottom housing)
Centrifuge grounding:
A=Grounding from Top Housing
B= Grounding from Motor
C= Grounding from Connector, Power.
Switch, power connection and Rectifier, Bridge connection.
A) Switch, Power connections:
A = From/To Main PCBA
B= From/To Connector, Power
B) Rectifier, Bridge connections:
C= From Transformer (Red cables)
D= From/To main PCBA (RED and BLACK
cables)
Note: kindly take note on the color and position of
the cable connections.
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SERVICE INSTRUCTIONS
Transformer cable connection:
A- A1 (Brown)= to Main PCBA point X21.1
A2 (Blue) = to Main PCBA point X21.3
B- B1 (Brown)= to Main PCBA point X21.4
B2 (Blue)= to Main PCBA point X21.6
Main PCBA connection:
A= (Black/Red) from Motor
B= (Black/Red) from Rectifier, Bridge
= (White) from Transformer
C= From Motor
Lid Lock connection:
A=Black Cable
B=Gray Cable
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CHAPTER 3 MAINTENANCE PROCEDURES
3.5
Trouble Shooting
3.5.1
Error messages: Cause / Solution
Preface:
The error messages are listed to help localize possible errors faster.
The diagnosis, referred to this chapter may not always be the case, as they are only
theoretically occurring errors and solutions.
Always, please keep us informed about any kind of error occurring, which is not listed in this
chapter. Only through your information we are able to improve this service manual.
Many thanks in advance for your support.
3.5.2
Possible error messages and their solutions
3.5.2.1 Lid release during power failure
In case of power failure or malfunction, the lid of the centrifuge can be opened
manually in order to protect your samples.
Please proceed as follows:
• Switch the centrifuge off and unplug the power cord.
• At the left side of the centrifuge there is a plastic stopper.
• Remove this stopper. Behind it there is a string (see figure 33).
• Now open the lid of the centrifuge by pulling this string, during you press the lid
slightlly
• Put the string and the plastic stopper back again.
• Switch the centrifuge on again, for go on working.
Warning: Don't put your hands in the rotor chamber as long as the rotor is still
spinning!
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CHAPTER 3 MAINTENANCE PROCEDURES
Figure 12
3.5.2.2.1
Description of the error message system
The error message is shown in the "time" display through particular numbers. At the same time
the word “error“ is indicated in the display (see figure 34).
Figure 13
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CHAPTER 3 MAINTENANCE PROCEDURES
3.6 Error Codes
Error No.
1
Description
Imbalance arose
Cause
Excessive acceleration at
the sensor
2
Imbalance sensor is defective
Rotary encoder circuit board
is defective, cable break,
plug is loose (between
control unit to frequency
converter), control unit is
defective
4
Imbalance switch has been
activated for longer than 5
seconds
Imbalance switch incorrectly
adjusted, imbalance switch
is defective, cable break,
plug is loose (between
control unit to frequency
converter), control unit is
defective
11
Temperature sensor is defective
12
Chamber over temperature
Temperature sensor is
defective, cable break, plug
is loose (between control
units to frequency
converter), control unit is
defective.
Relay on the controller is
defective, cooling is
defective, heating is
defective, ventilation is
defective.
14
Problem with the speed sensor.
Lid is closed for a certain time.
The blocking time is shown in the
display and replaced with
"CLOSE Lid".
Rotary encoder circuit board
is defective, cable break,
plug is loosening (between
control units to frequency
converter), motor is
blocked, control unit is
defective, frequency
converter is defective.
33
Open lid while the motor is
running
Control switch of the lid lock
is defective
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CHAPTER 3 MAINTENANCE PROCEDURES
Error No.
55
Description
Over speed
Cause
Transmission error,
firmware error, frequency
converter us defective.
60
Intermediate circuit under voltage
Motor defective, control
board defective
70
Relay hang-up
Relay K1 and K2 of the
control board is defective
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Suite 310
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Tel: +1 (973) 377-9000
Fax: +1 (973) 944-7177
With offices worldwide
www.ohaus.com
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™ Registered trademark of Ohaus Corporation.
The information contained in this manual is believed to be accurate at the time of
publication, but Ohaus Corporation assumes no liability arising from the use or misuse
of this material. Reproduction of this material is strictly prohibited.
Material in this manual is subject to change.