KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating manual
Electronic Crane Scales
Logbook
Regular maintenance and care
KERN HFA
Version 1.1
01/2015
GB
D-72336 Balingen
Fax: +49-[0]7433-9933-149
HFA-BA-e-1511
KERN HFA
Electronic Suspended balance
GB
Version 1.1 01/2015
Operating instructions / logbook
Contents
1. Technical data _________________________________________________ 4
1.1 Dimensions __________________________________________________________ 6
2. General Safety Instructions ______________________________________ 8
2.1 Duties of the owner-operator ___________________________________________ 8
2.2 Organizational measures ______________________________________________ 8
2.3 Environmental conditions ______________________________________________ 8
2.4 Pay attention to the instructions in the Operation Manual ___________________ 9
2.5 Proper use ___________________________________________________________ 9
2.6 Improper Use ________________________________________________________ 9
2.7 Warranty ____________________________________________________________ 9
2.8 Safe working ________________________________________________________ 10
2.9 Monitoring of Test Resources _________________________________________ 10
2.10 Testing upon acceptance _____________________________________________ 10
2.11 Initial Commissioning _________________________________________________ 10
2.12 Shutdown and storage ________________________________________________ 10
3. Appliance overview ____________________________________________ 11
3.1 Overview of display __________________________________________________ 13
3.2 Keyboard overview ___________________________________________________ 14
3.3 Label _______________________________________________________________ 15
4. Commissioning _______________________________________________ 16
4.1 Unpacking __________________________________________________________ 16
4.2 Scope of delivery ____________________________________________________ 16
4.3 Checking the original dimensions ______________________________________ 17
4.4 Battery / rechargeable battery operation ________________________________ 17
4.6 Suspending the balance ______________________________________________ 20
2 HFA-BA-e-1511
5. Operation ____________________________________________________ 21
5.1 Safety instructions ___________________________________________________ 21
5.2 Loading the suspended balance _______________________________________ 22
5.3 Turn on/off __________________________________________________________ 25
5.4 Set balance to zero __________________________________________________ 25
5.5 Taring ______________________________________________________________ 25
5.6 Weighing ___________________________________________________________ 26
5.7 Switch-over weighing unit _____________________________________________ 26
5.8 Hold weighing value (Data-HOLD function) ______________________________ 27
5.9 Peak value function (peak func ti o n) ____________________________________ 27
5.10 Weighing with tolerance range _________________________________________ 28
5.11 Automatic switch-off function (auto-off) _________________________________ 30
6. Menu ________________________________________________________ 30
6.1 Navigation in the menu: _______________________________________________ 30
6.2 Overview ___________________________________________________________ 31
7. Adjustment ___________________________________________________ 32
8. Linearization __________________________________________________ 34
8.1 Linearization ________________________________________________________ 34
8.2 Carry out linearization ________________________________________________ 35
9. Cleaning, Maintenance and Disposal ______________________________ 37
9.1 Cleaning and Disposal ________________________________________________ 37
9.2 Regular maintenance and care ________________________________________ 38
9.3 Checklist „regular maintenance“, (see chapter 9.2) _______________________ 39
10. Enclosure ____________________________________________________ 41
10.1 Checklist „Enhanced maintenance“ (General revision) ____________________ 41
HFA-BA-e-1511 3
1. Technical data
KERN HFA 600K-1 HFA 1T-4 HFA 3T-3
Readability (d) 0.2 kg 0.5 kg 1 kg
Weighing range (max) 600 kg 1000 kg 3000 kg
Taring range (subtractive) 599.8 kg 999.5 kg 2999 kg
Reproducibility 0.2 kg 0.5 kg 1 kg
Linearity ± 0 .4 kg ± 1 kg ± 2 kg
Recommended adjustment
weight, not added (class)
Stabilization time 2 s
Warm-up time 10 min
Units kg, lb, N
Auto off 10 min
Allowable ambient
temperature
Ambient humidity (max ) 80 %
Input Voltage
Battery
600 kg (M3) 1000 kg (M3) 3000 kg (M3)
5…+35 °C
Power supply unit 100 – 240 V, 50 / 60 Hz
Device 9 V, 800 mA
3 x 1.5 V AA
Service life (background illumination OFF) 30 h
Service life (background illumination OFF) 30 h
Rechargeable battery NiMH
Loading time 12 h
Display Digit height 2.3 cm
Housing material Steel
Net weight 1700 g
4 HFA-BA-e-1511
KERN HFA 5T-3 HFA 10T-3
Readability (d) 2 kg 5 kg
Weighing range (max) 5000 kg 10000 kg
Taring range (subtractive) 4998 kg 9995 kg
Reproducibility 2 kg 5 kg
Linearity ± 4 kg ± 10 kg
Recommended adjustment
weight, not added (class)
Stabilization time 2 s
Warm-up time 10 min
Units kg, lb, N
Auto off 10 min
Allowable ambient
temperature
Ambient humidity (max ) 80 %
Input Voltage
Battery
3000 kg (M3) 10000 kg (M3)
5…+35 °C
Power supply unit 100 – 240 V, 50 / 60 Hz
Device 9 V, 800 mA
3 x 1.5 V AA
Service life (background illumination OFF) 30 h
Service life (background illumination OFF) 30 h
Rechargeable battery NiMH
Loading time 12 h
Display Digit height 2.3 cm
Housing material Steel
Net weight 3900 g 5500 g
HFA-BA-e-1511 5
1.1 Dimensions
Balance 0.6 t / 1 t
Balance 3 t
6 HFA-BA-e-1511
Balance 5 t
Balance 10 t
HFA-BA-e-1511 7
2. General Safety Instructions
2.1 Duties of the owner-operator Follow national accident prevention regulations and all operator health a nd
safety at work and operating regulations.
Observe all safety regulations of the crane manufacturer.
The balance may only be used for the proposed purpose. Any type of use which
is not specified in these operating instructions, will be considered as improper
use. The customer is solely responsible for material damage and injury of persons
resulting from an improper use, Messrs. KERN & Sohn will not be liable under
any circumstance.
Messrs . KERN & Sohn cannot be held liable, if the suspended balance is
modified or used improperly and if damage is resulting from such use.
Carry out service and repair to suspended balance (see chap. 9.3), crane and
lifting tackle at regular intervals.
Log the test result and keep it in the logbook.
2.2 Organizational measures
Only trained and instructed staff may operate the balance.
Make sure that the operating instructions are kept nearby the operation site of the
suspended balance.
Assembly, commissioning and maintenance should only be carried out by trained
specialists.
Weight-bearing components must not be replaced.
2.3 Environmental conditions
Never operate suspended balance in spaces exposed to explosion hazards. The
serial version is not explosion protected.
Operate the suspended balance only under environmental conditions as specified
in these operating instructions (especially in chapter 1 „Technical data“).
Do not expose the suspended balance to strong humidity. Non-permitted
condensation (condensation of air humidity on the appliance) may occur if a cold
appliance is taken to a considerably warmer environment. In this case,
acclimatize the disconnected appliance for ca. 2 hours at room temperature.
Do not use suspended balance in environments exposed to corrosion hazards.
Protect the suspended balance against high humidity, vapours and dust.
Major display deviations (incorrect weighing results) may be experienced should
electromagnetic fi elds ( e.g . due to mobi l e phones or radio equipment), static
electricity accumulations or instable power supply occur. Change location or
remove source of interference.
8 HFA-BA-e-1511
2.4 Pay attention to the instructions in the Operation Manual
Carefully read this oper ati on ma nual before setup and
commissioning, even if you are already familiar with KERN
balances.
All language versions contain a non-binding translation.
The original German is binding.
2.5 Proper use
The balance you purchased is intended to determine the weighing value of material
to be weighed. It is intended to be used as a “non-automatic“ balance, i.e. the
material to be weighed is suspended on the load receptor only vertically, manually,
carefully and without jerks. As soon as a stable weighing value is reached the
weighing value can be read.
Use the suspended balance only for lifting and weighing of freely movable loads.
Danger of injury due to improper use. Not allowed are e.g.:
- Exceeding the allowed nominal load of crane, suspended balance or any
type of load attachment devices
- Conveying persons,
- Pulling loads over an inclined surface,
- Tearing-off, pulling or towing loads.
Modifications or reconstructions of the suspended balance or of the crane are not
allowed.
2.6 Improper Use
Do not use balance for dynamic weighing. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results can be
displayed due to the “stability compensation“. (Example: Slowly draining fluids from a
container suspended on the balance.) Do not leave permanent load suspended on
the balance. This may damage the measuring system as well as safety-relevant
parts.
The balance may only be used according to the described conditions. Other areas of
use must be released by KERN in writing.
2.7 Warranty
Warranty claims shall be voided in case
Our conditions in the operation manual are ignored
The appliance is used outside the described uses
The appliance is modified or opened
Mechanical damage and damage caused by media, liquids,
Natural wear and tear
The appliance is improperly set up or incorrectly electrically connected
The measuring system is overloaded
HFA-BA-e-1511 9
2.8 Saf e working
Do not stand under swinging loads, see chap. 5.1.
Position the crane in a way that the load is lifted vertically.
When working with the crane and suspended balance wear personal safety
equipment (helmet, safety shoes etc.).
2.9 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
balance and, if applicable, the testing weight, must be checked regularly. The
responsible user must define a suitable interval as well as type and scope of this test.
Information is available on KERN’s home page (www.kern-sohn.com) with regard to
the monitoring of balance test substances and the test weights required for this. In
KERN’s accredited DKD calibration laboratory test weights and balances may be
calibrated (return to the national standard) fast and at moderate cost.
2.10 Testing upon acceptance
Inspect packaging immediately upon receipt and inspect device when unpacking (see
chap. 4.1.) in the event of any evident damage.
2.11 Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have
reached the operating temperature (see warming up time chap. 1).
During this warming up time the balance must be connected to the power supply
(mains, accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
For checking original dimensions, s. chap. 4.3
2.12 Shutdown and storage
Remove suspended balance from crane and remove all attachment devices from
the suspended balance.
Do not store suspended balance outdoors.
10 HFA-BA-e-1511
3. Appliance overview
Lifting tackle not included in scope of delivery.
Standardised attachment devices are to be used to attach loads.
1 Anchor eyelet
2 Display
3 Keyboard
HFA-BA-e-1511 11
Rear
Battery or rechargeable battery
compartment
Mains connection
12 HFA-BA-e-1511
3.1 Overview of display
Display Significance
Rechargeable battery capacity
Indicators for weighing with tolerance range
M+ Totalization
STABLE Stability display
ZERO Zero indicator
Net The displayed weighing value is a net weighing value
OZT
Lb
kg
Weighing Units
HFA-BA-e-1511 13
3.2 Keyboar d ove rview
Button Description of function
• Taring
• Zeroing
• Exit menu / back to weighing mode.
• Switch-over weighing unit
• Scroll up/down menu
• For numeric entry increase value of digit
• Set readability (options: 1d/2d/5d/10d/20d)
• Set weight display
• Set peak load
• Confirm
• Switch over weighing unit (kglbN)
• Select digits for numeric entry
• Turn on/off balance
14 HFA-BA-e-1511
3.3 Label
(example)
Do not stand or go under suspended loads.
Do not use on building site.
Keep an eye on suspended loads.
Do not exceed nominal rated load of balance.
The product conforms to the requirements of the
German Equipment and Product Safety Act.
HFA-BA-e-1511 15
Thanks for your comprehension.
Your KERN Quality assurance team
• For crane see chap. 3.0
4. Commissioning
+ Always observe chapter 2 „General Safety Instructions“!
4.1 Unpacking
Once delivered and unpacked, suspended balances will
not be taken back.
SAFETY
INSTRUCTIONS
for protection against
break
4.2 Scope of delivery
Remove balance and accessories from packaging, remove packaging material.
Verify that there has been no damage and that all packing items are present.
The crane scales have been sealed by Messrs. KERN.
Removal from packaging is also sealed.
+ Broken seal obliges to purchase.
Fig.: Seal
• Rechargeable battery (3 x 1.5 V AA)
• Operating instructions / logbook
16 HFA-BA-e-1511
4.3 Checking the original dimensions
Enter the original dimensions shown on the production data sheet in the grey
boxes of checklist chap. 9.3.
Check original dimension of suspended balance; for implementation see chap.
8.3 „Regular Maintenance“
Enter all data (date, tester, results) in the first line under „Inspection before first
use“ in the checklist (see chapter 9.3)
If the dimensions of your first safety inspection do not match those
of KERN, the balance must not be put into operation. In this case
CAUTION
4.4 Battery / rechargeable battery operation Battery operation:
When batteries are empty, will appear on the balance’s display
please contact a service partner authorised by Messrs. KERN.
Press and replace batteries.
Open battery compartment, replace batteries and close battery compartment again.
In order to save the battery, the balance switches automatically off after 4 minutes
without weighing. This auto-off function can be deactivated in the menu, see chap. 6.
When the suspended balance is out of operation for a longer period, remove the
batteries.
Unscrew battery / rechargeable battery
compartment in the direction of the
arrow.
Replace batteries and relock battery /
rechargeable battery compartment.
HFA-BA-e-1511 17
Accu operation:
When the rechargeable battery is empty, appears on the balance’s display.
Turn off balance and connect power supply unit; battery is charged.
Once the battery has been fully charged the display will show the symbol.
Insert rechargeable battery:
Unscrew battery compartment in arrow
direction.
Remove batteries including battery
mount from the device.
18 HFA-BA-e-1511
Connect cable of balance to battery
cable as shown on image.
Insert battery in the centre.
Ensure that the cables are not kinked.
Relock battery compartment.
HFA-BA-e-1511 19
4.6 Suspending the balance
Condition
The crane needs a safety bracket (1) that the unloaded suspended balance cannot
fall down.
If the safety bracket is missing or damaged, please contact the crane manufacturer in
order to receive a hook with this safety equipment.
Attach the suspended balance to the lower hook of a crane and close the safety
bracket.
The crane scale’s upper eyelet should rest in the saddle (2).
20 HFA-BA-e-1511
Check all parts (hook, carbines, rings, rope slings,
faults can be seen on the safety bracket of the crane
hook or if it is missing completely, the scales must not
(example)
balance or any kind of attachment device on the
5. Operation
5.1 Safety instructions
DANGER
Risk of injury due to falling loads!
Take great care when operating the crane and follow the
general rules for crane operation.
cables, chains etc.) for excessive wear or damage
If
be used.
Work only with appropriate speed
Always avoid vibrations and horizontal forces. Avoid
any kind of shock, torsion and oscillating (e.g. caused
by inclined suspending)
Do not use the suspended balance for conveying loads.
Do not stand or go under suspended loads.
Do not use on building site.
Keep an eye on suspended loads.
Do not exceed nominal rated load of crane, suspended
suspended balance.
HFA-BA-e-1511 21
5.2 Loading the suspended balance
For good weighing results observe the following, illustrations see next page:
Only use load attachment devices which guarantee a one-spot suspension and
where the scales can be suspended freely.
Do not use too large load attachment devices which do not guarantee any one-
spot suspension.
Do not use multiple suspensions.
Do not pull or push the load or the loaded balance.
Do not pull the hook horizontally.
Loading the balance
1. Position the hook of the suspended balance over the load.
2. Move downwards the suspended balance until the load can be suspended on the
hook of the balance. Reduce the speed when the respective height is going to be
reached.
3. Attach load to attachment device. Ensure that all safety-relevant devices are
functional (e.g. the safety latch is closed). If the load is fixed by slings, ensure that
the slings rest completely on the saddle of the balance hook.
4. Lift-off the load slowly.
When the load is fixed by slings, ensure that the load is well balanced on both
sides and that the slings are correctly positioned
22 HFA-BA-e-1511
+ Always use suitable lifting tackle.
Only use attachment devices
which guarantee a one-point
suspension and where the
scales can be suspended freely.
Do not use too large attachment
devices which cannot guarantee
a one-point suspension.
HFA-BA-e-1511 23
Do not push or pull
Do not pull the hook horizontally
Do not use multiple suspensions
24 HFA-BA-e-1511
5.3 Turn on/off Start-up
Press . The display lights up and the balance carries out a selftest. As soon
as the weight display appears, the instrument will be ready to weigh.
Switching Off
Press .
5.4 Set balance to zero
In order to obtain optimal weighing results, reset to zero the balance before weighing.
Unload the balance
Press , zero display as well as indicator ZERO will appear.
5.5 Taring
Attach initial load.
Press until zero display appears. The weight of the container is now
internally saved.
Weigh the material, the net weight will be indicated.
After removing the preload weight appears as negative display.
To delete the tare value, remove load from suspended balance and press .
HFA-BA-e-1511 25
5.6 Weighing
Load the suspended balance.
The weight value will be displayed at once.
Overload warning
Overloading exceeding the stated maximum load (max) of the balance, minus a possibly
existing tare load, must be strictly avoided. This could cause damage to the balance.
Exceeding the maximum load is indicated by the display „ol“ . Unload balance or reduce
preload.
5.7 Switch-over weighing unit
The next weighing unit kgNlb will be displayed after each press of the UNIT
button.
The indicator above N shows weight in Newton.
In menu item “F2 UNt“, weighing units “N“ and “lb“ can be turn on or off.
26 HFA-BA-e-1511
5.8 Hold weighing value (Data-HOLD function)
Once a stable weight value has been established, this can be fixed until deleted
before the next weighing activity.
Attach the material to be weighed
To start the Hold function, press and the heaviest load of the last weighing
activity will be displayed.
The indicator above HOLD appears.
The weighing value will be held in the display until it is deleted by .
5.9 Peak value function (peak function)
Attention:
Never exceed the maximum permitted load of the peak value on the
balance (!!Danger of breaking!!).
To start the peak value function, press and hold during zero display.
Lift load and the heaviest load of the weighing activity will be displayed.
The indicator above PEAK will appear.
The peak load will be held on the display until deleted by pressing . For that,
press for about 2-3 seconds. The above PEAK disappears.
HFA-BA-e-1511 27
5.10 Weighing with tolerance range
To ensure that your weight value is within a defined tolerance range, you can define
an upper and a lower limit value of your choice using function “F3 chk“ (See chap. 6).
During tolerance tests such as portioning or sorting the unit will indicate exceeded or
undershot limits by emitting an optical or acoustic signal.
Optical signal:
The optical signals provide the following information:
Load exceeds specified tolerance
Load within specified tolerance
Load below specified tolerance
Call up function “F3 chk“:
1. Switch-on balance and during the selftest press .
The first function „F0bk“ is displayed.
2. Press repeatedly until “F3 chk“ will be displayed.
3. Press , the display used for entering the lower limit „Ck Lo“ appears.
4. Press again, the currently set lower limit value is displayed. The active digit
is flashing. Press to select the digit to be amended.
To change the selected (flashing) digit, press repeatedly until the desired
value is displayed.
5. Confirm entry by , “Ck Lo“ will appear.
6. Press , the display used to enter the upper limit value “Ck Hi“ will appear.
28 HFA-BA-e-1511
7. Acknowledge by .
8. Press again, the currently set upper limit value is displayed. The active digit
is flashing. Press to select the digit to be amended.
To change the selected (flashing) digit, press repeatedly until the desired
value is displayed.
9. Confirm entry by , “Ck Hi“ will appear.
10. Press , the display used to set the audio signal “bEEP“ will appear.
11. Press , the current setting for the acoustic signal will be shown.
12. Select desired setting (bp 1, bp 2, bp 3) by and confirm by .
13. Press repeatedly to exit menu. From here evaluation takes place whether
the goods to be weighed are within the two tolerance limits.
Start tolerance check:
Tare when using a weighing container.
Put on goods to be weighed, tolerance control is started. The signal lights indicate
whether the load is within the two set limits.
Load below specified
tolerance
Load within specified
tolerance
Load exceeds specified
tolerance
The indicator [LO] appears The indicator [OK]
appears
• The tolerance control is not active when the weight is under 20d.
• To delete limits, enter “0000 kg“.
HFA-BA-e-1511 29
The indicator [HI] appears
current setting will be displayed.
5.11 Automatic switch-off function (auto-off)
The automatic switch-off function allows you to set a period of time in the menu after
that the balance will switch off automatically in stand-by mode.
6. Menu
6.1 Navigation in the menu:
Call up menu
Select menu item
Select setting
Change settings
Confirm setting
Exit menu / Return to
weighing mode
Switch-on balance and during the selftest press .
The first function F0bk is displayed.
With help of , the individual menu items can be
selected one after the other.
Confirm selected menu item by pressing . The
Switch into the available settings using .
Press , balance returns to menu
Press repeatedly.
30 HFA-BA-e-1511
Available
settings
F0 bk
F1 AZ
AZ 0.5d
AZ 1d
AZ 2d
AZ 4d
F2 Unt
unit
Ut lb
Pound
Ut kg
Kilogram
Ut N
Newton
F3 CHk
Ck Lo
Ck Hi
1000 kg
2000 kg
3000 kg
5000 kg
10 000 kg
SPd 7.5
SPd 15
SPd 30
SPd 60
Off 0
Off 3
Off 5
Off 15
Off 30
6.2 Overview
Function
Display background
illumination
Autozero
Standard weighing
Check weighing
F4 CAP
Capacity
Description
bk on Background illumination on
bk off Background illumination off
bk AU Background illumination switches on
automatically when loaded or a button is
pressed
Automatic zero correction (auto-zero) on change of
display,
Selectable digits available
Lower limit value, input see chap. 5.9
Upper limit value, input see chap. 5.9
Weighing range [Max],
options
1000 / 2000 / 3000 / 5000 /
10000 kg
0.5d,1d, 2 d, 4 d.
Modifications may
only be carried out
by a specialist with
competent
knowledge.
F5 CAL
Adjustment /
nonLi Adjustment
Line Linearization
linearization
F6 isp XXXXX Internal A/D converter value
F7 GrA Not documented
F8 rst Reset to default setting
F9SPd
Display speed
F10of
Autom. switch-off
function
Off 0: Autom. switch-off function disabled
Off 3/5/15/30: Balance will switch off after x
minutes in stand-by mode.
(auto off)
* = default setting
HFA-BA-e-1511 31
is required for stabilization.
Turn off balance and attach suitable lifting tackle.
during self-test. The first function „F0bk“ is displayed.
7. Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each balance must be coordinated - in compliance with the underlying physical
weighing principle - to the existing acceleration due to gravity at its place of location
(only if the balance has not already been adjusted to the location in the factory). This
adjustment process must be carried out for the first commissioning, after each
change of location as well as in case of fluctuating environment temperature. To
receive accurate measuring values it is also recommended to adjust the balance
periodically in weighing operation.
• Provide the required adjustment weight, see chap. 1. “Techn. data“.
The weight to be used depends on the capacity of the scale. Carry out
adjustment as near to maximum load as possible. Info about test weights can
be found on the Internet at: http://www.kern-sohn.com
• Observe stable environmental conditions. A warming up time (see chapter 1)
Turn on balance with the lifting tackle attached and press
Press repeatedly until „F5CAL“ is displayed.
Press , the last parameter set will be displayed.
• „nonLi“ Adjustment of balance
or
• „LinE“ Linearisation of balanc e
Select „nonLi“ by
32 HFA-BA-e-1511
Press , “ULoAd“ will be displayed. Make sure t hat no
loads apart from the lifting tackle are attached to the hook.
Wait for stability display, then press .
Either use the displayed adjustment weight or change by
and , the currently enabled digit is flashing.
Press to select the digit to be amended.
To change the selected (flashing) digit, press
repeatedly until the desired value is displayed.
Confirm by , „LoAd“ will be shown.
Attach adjustment weight. Wait for stability display, then
press .
(example)
After successful adjustment „Pass“ will be displayed. After
that, the balance will carry out a self-test, followed by a brief
display of “Err4“.
Finally the balance returns automatically to weighing mode,
adjustment has been carried out successfully.
(example)
An adjusting error or incorrect adjusting weight will be indicated by the error
message; repeat adjustment procedure.
HFA-BA-e-1511 33
• Carrying out linearization is restricted to specialist staff possessing well
chapter 2.9 “Testing instruments control”
8. Linearization
8.1 Linearization
Linearity shows the greatest deviation of a weight display on the scale to the value of
the respective test weight according to plus and minus over the entire weighing
range.
If linearity deviation is discovered during a monitoring of test resources, you can
improve this by means of linearization.
acquainted with the workings of balance.
• The test weights to be used must be adapted to the balance’s
specifications; see chapter 2.9 “Testing instruments control”.
• Observe stable environmental conditions. Stabilisation requires a certain
warm-up time.
• After successful linearization you will have to carry out calibration; see
34 HFA-BA-e-1511
during self-test. The first function „F0bk“ is displayed.
8.2 Carry out linearization
Turn off balance and attach suitable lifting tackle.
Turn on balance with the lifting tackle attached and press
Press repeatedly until „F5CAL“ is displayed.
Press , the last parameter set will be displayed.
• „nonLi“ Adjustment of balance
or
• „LinE“ Linearisation of balanc e
Select „LinE“ by
Press , “LoAd 0“ will appear. Make sure that no loads
apart from the lifting tackle are attached to the hook.
Wait for stability display and press again. “LoAd 1“
(1/3 max) will be displayed.
Attach first adjustment weight, wait for stability display
Press , “LoAd 2“ (2/3 max) will be displayed.
HFA-BA-e-1511 35
(example)
Attach second adjustment weight, wait for stability display
Press , “LoAd 3“ (max load) will be displayed
Attach third adjustment weight, wait for stability display
Press , “PASS“ will be displayed
Finally the balance will carry out a self-test, “Err19“ is briefly
displayed (Ignore error message), then the balance returns
automatically to weighing mode, the weight value is
displayed and linearization has been completed
successfully.
If an error occurs, turn off on restart balance and repeat linearization.
36 HFA-BA-e-1511
Risk of injury and risk of material damage!
9. Cleaning, Maintenance and Disposal
The suspended balance is part of the lifting gear!
For a safe operation please observe the following:
Danger
Have carried out a regular maintenance by trained specialized
staff
Carry out regular maintenance and servicing, see chap. 8.3.
Have the parts exchanged only by trained specialized staff.
If there arose discrepancies with the safety checklist, the balance
must not more be put into operation.
Do not repair the suspended balance yourself. Repair may only be
carried out by service partners authorized by Messrs. KERN.
9.1 Cleaning and Disposal
Damage to suspended balance!
Do not use industrial solutions or chemicals (e.g. acid
CAUTION
embrittlement).
Clean the keyboard and the display with a soft cloth soaked in mild window
cleaning agent.
Disposal of packaging and appliance must be carried out by operator according to
valid national or regional law of the location where the appliance is used.
HFA-BA-e-1511 37
Prior to each usage
Check for fault-free operation of the attachment devices
weighing processes
9.2 Regular maintenance and care
The regular 3-month maintenance may only be carried out by an expert with
competent knowledge of working with suspended balances. Thereby the national
regulations for prevention of accidents as well as the working, operation and
safety regulations of the owner-operator.
To check the dimensions only use suitable test devices.
The regular 12-month maintenance must only be carried out by trained
specialized staff (KERN customer service).
The results of the maintenance must be written down in the checklist (chap. 9.3).
The additional results of the extended maintenance have to be entered in the
checklist (chapter 9.3).
The load suspension devices must be cleaned before inspection, see chap. 9.1.
Regular maintenance:
Initial start-up,
every 3 months or
definitely after
12 500 weighing
processes
Every 12 m onths or
in any case after
50 000 weighing
processes
Every 10 years or
anyway after 500 000
Note
For inspection of wear and tear please refer to the drawing (See chap. 9.3) below.
Rejection criteria: Load suspension devices may no longer be used when e.g.
Check all dimensions, see checklis t cha p. 9.3
Check the suspended balance and the used attachment
device for wear and tear, such as e.g. plastic deformation,
mechanical damage (unevenness), notches, str i ati on,
cracks, corrosion and torsions.
Remove balance fro m use immediately if a reading exceeds
the permitted deviation from the original reading (see
checklist, chap. 9.3) or any other fault is identified.
If the enhanced maintenance has to be carried out by
trained staff (KERN customer service). At this general
revision all load carrying parts must be checked for gaps
with magnetic powder
Replace entire suspe n ded bal a nc e
+ If deviations during the tests defined for maintenance were discovered.
+ The type or load rating plate is missing.
+ Load suspension devices known to have been overloaded or subject to
other harmful influences may no longer be used and/or may be re-used only
after inspection.
38 HFA-BA-e-1511
Original dimensions suspended
always available)
9.3 Checklist „regular maintenance“, (see chapter 9.2)
balance
Serial no. ……………………………
(You can find these data in the
documentation enclosed with the
balance. Please keep this document
Capacity ……………………………
Lifting eyes clearance k [mm]
Date ………………………………… Tester ………………………………………
HFA-BA-e-1511 39
Clearance k Date Tester
Max. admitted variation
Revision prior to first use
3 months / 12,500 x
6 months / 25,000 x
9 months / 37,500 x
12 months / 50,000 x
15 months / 62,500 x
18 months / 75,000 x
21 months / 87,500 x
24 months / 100,000 x
27 months / 112,500 x
30 months / 125,000 x
1%
33 months / 137,500 x
36 months / 150,000 x
39 months / 162,500 x
21 months / 87,500 x
42 months / 175,000 x
45 months / 187,500 x
48 months / 200 000
51 months / 212,500 x
54 months / 225,000 x
57 months / 237,500 x
60 months / 250 000x
All load carrying parts have to be exchanged by a service
partner authorised by KERN.
bold letters = this maintenance work has to be carried out by a service partner
authorized by KERN.
40 HFA-BA-e-1511
10. Enclosure
10.1 Checklist „Enhanced maintenance“ (General revision)
The enhanced maintenance has to be carried out by a service partner authorized by
KERN.
Model …………………………………..
Suspended balance
Serial no. ……………………………………………..
Magnetic
Interval
12 months / 50,000 x
24 months / 100,000 x
36 months / 150,000 x
particle testing
for cracks
lifting eyes
Date Name Signature
48 months / 200,000 x
60 months / 250,000 x
72 months / 300,000 x
84 months / 350,000 x
96 months / 400,000 x
108 months/ 450 000x
120 months/ 500 000x
Replace suspended balance completely
HFA-BA-e-1511 41
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