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 HFT
Version 1.0
11/2013
GB
D-72336 Balingen
Fax: +49-[0]7433-9933-149
HFT-BA-e-1310
GB
KERN HFT
Electronic Crane Scales
Version 1.0 11/2013
Operating instructi ons / l ogbook
Contents
1 Technical data _________________________________________________ 4
1.1 Dimensions balance (mm) ___________________________________________________________ 5
1.2 Dimensions display unit (mm) ________________________________________________________ 6
2 General Safety Instructions ______________________________________ 7
2.1 Duties of the owner-operator _________________________________________________________ 7
2.2 Organizational measures ____________________________________________________________ 7
2.3 Pay attention to the instructions in the Operation Manual _________________________________ 7
2.4 Environmental conditions ____________________________________________________________ 8
2.5 Proper use ________________________________________________________________________ 8
2.6 Improper Use ______________________________________________________________________ 8
2.7 Warranty __________________________________________________________________________ 9
2.8 Safe working_______________________________________________________________________ 9
2.9 Monitoring of Test Resources ________________________________________________________ 9
2.10 Testing upon acceptance ____________________________________________________________ 9
2.11 Initial Commissioning _______________________________________________________________ 9
2.12 Shutdown and storage ______________________________________________________________ 9
3 The crane scales at a glance ____________________________________ 10
3.1 Appliance overview crane scale _____________________________________________________ 10
3.2 Appliance overvi e w display unit _____________________________________________________ 11
3.3 Overview of display ________________________________________________________________ 12
3.4 Keyboard overview ________________________________________________________________ 13
3.5 Numerical input via the navigation buttons ____________________________________________ 14
3.6 Label ____________________________________________________________________________ 14
4 Commissioning _______________________________________________ 15
4.1 Unpacking ________________________________________________________________________ 15
4.2 Checking the original dimensions ____________________________________________________ 15
4.3 Rechargeable battery operation _____________________________________________________ 16
4.4 Suspending the balanc e ____________________________________________________________ 17
5 Operation ____________________________________________________ 18
2 HFT-BA-e-1310
5.1 Safety instructions _________________________________________________________________ 18
5.2 Loading the crane scales ___________________________________________________________ 19
5.3 Turn on/off _______________________________________________________________________ 22
5.4 Set balance to zero ________________________________________________________________ 22
5.5 Taring ___________________________________________________________________________ 23
5.6 Weighing _________________________________________________________________________ 23
5.7 Fix the weight value (Data-HOLD function) ____________________________________________ 24
5.8 Weighing Units ____________________________________________________________________ 24
5.9 Totalization _______________________________________________________________________ 26
5.10 Automatische Nullpunktkorrektur ____________________________________________________ 29
6 Menu ________________________________________________________ 30
6.1 Navigation in the menu: ____________________________________________________________ 30
6.2 Menu overview ____________________________________________________________________ 31
7 Adjustment ___________________________________________________ 33
8 Data output RS 232 ____________________________________________ 35
8.1 Technical data ____________________________________________________________________ 35
8.2 Technical data ____________________________________________________________________ 35
8.3 Continuous data output ____________________________________________________________ 35
8.4 Printer mode ______________________________________________________________________ 36
9 Error messages _______________________________________________ 37
10 Cleaning, Maintenance and Disposal ______________________________ 38
10.1 Cleaning and Disposal _____________________________________________________________ 38
10.2 Regular maintenance and care ______________________________________________________ 39
10.3 Regular maintenance ______________________________________________________________ 39
10.4 Checklist „regular maintenance“, (see chapter 10.3) ____________________________________ 40
11 Enclosure ____________________________________________________ 43
11.1 Checklist „Enhanced maintenance“ (General revision) __________________________________ 43
11.2 List „spare parts and repair of safety-relevant parts“ ____________________________________ 44
HFT-BA-e-1310 3
1 Technical data
Loading time 12 h
Dimensions, completely
W x D x H, (mm)
KERN HFT 3T0.5 HFT 5T1 HFT 10T2 HFT 15T5
Readability (d) 0.5 kg 1 kg 2 kg 5 kg
Weighing range (max) 3 000 kg 5 000 kg 10 000 kg 15 000 kg
Taring range (subtractive) 3 000 kg 5 000 kg 10 000 kg 15 000 kg
Reproducibility 500 g 1 kg 2 kg 5 kg
Linearity ± 1 kg ± 2 kg ± 4 kg ± 10 kg
Recommended adjustment
weight, not added (class)
Stabilization time 2 s
Precision 0.2 % of max.
Warm-up time 30 min 10 min 10 min 10 min
Unit kg, lb
Allowable ambient
temperature
Relative humidity 0 to 80 %, non-condensing
Input Voltage 220V - 240V AC 50 Hz
Secondary voltage powerpack 12V, 500 mA
Rechargeable battery
(standard equipment)
Display Digit height 22 mm
3 t (M3) 5 t (M3) 10 t (M3) 15 t (M3)
0…+40 °C
6 V, 4 Ah
Service life (background illumination OFF) 35 h
Dimensions display unit
W x D x H, (mm)
assembled
Housing material Chromatized steel
Material of display unit Plastic
Net weight (kg) 87
4 HFT-BA-e-1310
175 x 84 x 39
130x650x130 160x760x160 180x870x180 180x870x180
1.1 Dimensions balance ( mm)
Model A B C D E
HFT 3T0.5 43 28 606 650 130
HFT 5T1 58 40 693 760 160
HFT 10T2 83 51 781 870 180
HFT 15T5 99 57 842 950 180
HFT-BA-e-1310 5
Model a b c d e f g
HFT 3T0.5 16 42.9 19.1 27.5 28 16 31
HFT 5T1 22.4 57.9 25.4 40 45 31 51
HFT 10T2 31.8 82.6 35.1 51 57 30 62
HFT 15T5 38.1 98.6 41.4 57 70 30 73
1.2 Dimensions display unit (mm)
6 HFT-BA-e-1310
2 General Safety Instructions
2.1 Duties of the owner-operator
Follow national accident prevention regulations and all operator health and 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 crane scales are modified or
used improperly and if damage is resulting from such use.
• Inspect and service crane balance, crane and load suspension devices regularly
(see chap. 10.3).
• Log the test result and keep it in the logbook.
2.2 Organizational measures
• Only trained and instruct ed staff may operate the balance.
• Make sure that the operating instructions are kept nearby the operation site of the
crane scales.
• Assembly, commissioning and maintenance should only be carried out by trained
specialists.
• Repair of safety-relevant pieces may only be carried out by KERN or by service
partners authorized by Messrs. KERN. (competence certificate or training).
• Use original spare parts only.
• All repairs and spare parts must be documented by the service partner (see list,
chap. 11.2).
• All maintenance must be documented (see checklist chap. 11.1).
• Load suspending components may only be exchanged as a complete spare parts
set. The dimensions of the new components must be noted (see checklist chapter
11.1).
2.3 Pay attention to the instru ctions in the Operation Manual
Carefully read this operation manual 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.
HFT-BA-e-1310 7
2.4 Environmental conditions
• Never operate the crane scales in explosive environment. The serial version is
not explosion protect e d.
• Operate the crane scales only under environmental conditions as specified in
these operating instructions (especially in chapter 1 „Technical data“).
• Do not expose the crane scales to strong humidity. Non-permitted cond ensation
(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 operate the crane scales in corrosive environment.
• Protect the crane scales against high humidity, vapours and dust.
• Major display deviations (incorrect weighing results) may be experienced should
electromagnetic fields (e.g. due to mobile phones or radio equipment), static
electricity accumulations or instable power supply occur. Change location or
remove source of interference.
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 crane hook only vertically, manually,
carefully and without jerks. As soon as a stable weighing value is reached the
weighing value can be read.
• Use the crane scales 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, crane scales 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 crane scales 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.
8 HFT-BA-e-1310
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
2.8 Safe working
• Do not stand underneath suspended loads!
• Position the crane in a way that the load is lifted vertically.
• When working with the crane and crane scales 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
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible 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. 4.2
2.12 Shutdown and storage
• Take off the crane scales from the crane and dismantle all load attachment
devices from the crane scales.
• Do not store the crane scales at open air
HFT-BA-e-1310 9
3 The crane scales at a glance
3
Hooks
The crane scales are a multi-purpose and cost-saving solution for overhead weighing
applications such as e.g. recycling, metal processing, machine engineering, transport
and logistics.
3.1 Appliance overview crane scale
1 Shackle
2 Housing cover
4 Safety bracket
5 Antenna
10 HFT-BA-e-1310
3.2 Appliance overview display unit
Front view display unit (receiver):
Back view display unit (receiver):
1. Antenna
2. Battery charge status
3. Weight display
4. Keyboard
5. RS-232
6. Mains adapter
connection
7. Table leg
HFT-BA-e-1310 11
3.3 Overview of display
Display Significance
Charging status of rechargeable battery
Radio communication between display unit and crane scale
STABLE Stability display
ZERO Zero indicator
M+ Totalization
HOLD HOLD function
12 HFT-BA-e-1310
3.4 Keyboard overview
Button Function
• Turn on/off
• With a weight value >10% Max. the button function is
Taring
Navigation
Navigation
Navigation
• With a weight value <10% Max. the button function is
Zero setting
• Confirm entry
• Short-time increase of the resolutio n
• At numeric input increase flashing digit
• Scroll forward in menu
• Hold function / determination of a mean value
• In adjustment process: Change decimal digit
• Digit selection to the right
• Add weighing value to summation memory
• Display sum total
• Calculate weighing data via interface
• Delete
Navigation button
HFT-BA-e-1310 13
• Digit selection to the left
• Switch-over weighing unit
• Back to menu/weighing mode
3.5 Numerical input via the navigation buttons
Button
Navigation
Function
3.6 Label
Increase flashing dig i t
Digit selection to the left
Delete
Digit selection to the right
Confirm
Do not stand or go under suspended loads.
Do not use on building site.
Keep an eye on suspended loads.
Do not exceed nominal load of crane scales.
(example)
The product conforms to the requirements of the
German Equipment and Product Safety Act.
14 HFT-BA-e-1310
4 Commissioning
Thanks for your comprehension.
Your KERN Quality assurance team
Attention: Always observe chapter 2 „General Safety Instructions“!
4.1 Unpacking
Once delivered and unpacked, crane scales will not be
taken back.
SAFETY
INSTRUCTIONS
for protection against
break
The crane scales have been sealed by Messrs. KERN.
Shackles and hooks are sealed by Sella tape.
The packaging is also sealed by adhesive tape.
+ Broken seal obliges to purchase.
The crane scales are compact and quite heavy.
Remove the scales from packaging only with the help of
Danger for the back!
Only use original packaging for returning.
a second person.
Use a lifting device such as a crane or a forklift truck.
Secure the scales that they cannot fall down when they
are lifted.
Make sure that all parts are completely present:
• Crane scales
• Display Unit
• Cable screwing „Interface cable“
• 2 x mains adapter
• Operating instructions (l og book )
4.2 Checking the original dimensions
Enter the original dimensions shown on the production data sheet in the grey
boxes of checklist chap. 10.4.
Check original dimension of crane scales; for implementation see chap. 10.3
„Regular Maintenance“
Enter all data (date, te s ter , resul ts ) in the firs t li ne under „Inspection before first
use“ in the checklist (see chapter 10.4)
If the dimensions of your first safety inspection do not match those
of KERN, the balance must not be put into operation. In thi s cas e
CAUTION
HFT-BA-e-1310 15
please contact a service partner authorised by Messrs. KERN.
4.3 Rechargeable battery operation
Material damage on crane scales
1
ON/OFF switch
2
LED „Battery charging status“
3
LED „rechargeable battery is
charged“
4
Mains connection
Crane scales:
Only use the delivered mains adapter.
Make sure that the mains adapter, the cable and the
CAUTION
mains plug are in a perfect condition.
Do not use the crane scales during the loading process.
Before the first use, the rechargeable battery should be charged by connecting it to
the mains power cable for at least 12 hours. For loading the rechargeable battery
please only use the delivered mains adapter. The operating time of the rechargeable
battery is approx. 35 hours.
• If the LED display (2) next to the mains connection (4) is illuminated, the
battery should be recharged.
• LED (3) is illuminated during the battery loading.
Display Unit
Before the first us e, the batter y shoul d be ch arged by connecti ng it to the mains p ower su pply
for at least 12 hours. The ap pearanc e of th e recha rgeabl e battery symbol in th e weight display
indicates that the battery is almost exha usted. The unit will be rea dy for o peratio n for a pprox.
another 10 hour s before sw itching off aut omaticall y. Charge the bat tery with the help of the
supplied power pack.
The recharge able ba ttery symbol s hows t he charg e status of the recharg eable battery :
Voltage has dropped below prescribed minimum.
Rechargeable battery very low.
Rechargeable battery completely reloaded
16 HFT-BA-e-1310
4.4 Suspending the balance
Condition
The crane needs a safety bracket (1) that the unloaded crane scales 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.
Suspend the crane scales on the lower hook of a crane and close the safety
bracket.
The crane scale’s upper eyelet should rest in the saddle (2).
HFT-BA-e-1310 17
5 Operation
Take great care when operating the crane and follow the
Check all parts (hook, eyelet, rings, rope slings, cables,
If faults can be seen on the safety bracket of the hook
it is missing completely, the scales must not be
any kind of shock, torsion and oscillating (e.g. caused
(example)
Do not exceed the nominal load of crane, crane scales
or any kind of load attachment devices at the crane
5.1 Safety instructions
Danger
Risk of injury due to falling loads!
general rules for crane operation.
chains etc.) for excessi ve wear or damage
or if
used
Work only with appropriate speed
Always avoid vibrations and horizontal forces. Avoid
by inclined suspending)
Do not use the crane scales for transporting loads.
Do not stand or go under suspended loads.
Do not use on building site.
Keep an eye on suspended loads.
scales.
18 HFT-BA-e-1310
5.2 Loading the crane scales
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 crane scales over the load.
2. Move downwards the crane scales 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. Suspend the load on the hook. Ensure that the safety bracket 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
HFT-BA-e-1310 19
Only use load attachment devices
which guarantee a one-point
suspension and where the scales
can be suspended freely.
Do not use too large load
attachment devices which cannot
guarantee a one-point
suspension.
20 HFT-BA-e-1310
Do not push or pull
Do not pull the hook horizontally
Do not use multiple suspensions
HFT-BA-e-1310 21
5.3 Turn on/off
Start-up
Press on the display unit; the unit will carry out a self-test. As soon as the
weight display appears, the instrument will be ready to weigh.
At the crane scales put the ON/OFF switch to „ON“
If „Err 10“ appears in the weight display no radio
communication with the balance could be established.
Either the crane scale is not yet switched on or the
rechargeable battery has not been sufficiently loaded.
Switch on the crane scale with the ON/OFF switch or reload
the battery.
„Err 10“ disappears and the zero display will appear. The
balance is now in weighing mode and ready for operation.
Switching Off
Press at the display unit, the display disappears.
At the crane scales put the ON/OFF switch to „OFF“
5.4 Set balance to zero
In order to obtain optimal weighing results, reset to zero the balance before weighing.
Manual
Unload the balance
Press , zero display as well as indicator ZERO will appear.
Automatic
In the menu the amount of the automatic zero point correction can be changed,
see chapter 6 / Function „F1 A20“.
22 HFT-BA-e-1310
5.5 Taring
Suspend preload.
Press the -button and wait until the 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 crane scales and press the
button.
5.6 Weighing
Loading the crane scales.
Wait for stability display STABLE.
Read weighing result.
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.
HFT-BA-e-1310 23
5.7 Fix the weight value (Data-HOLD function)
Suspend the material to be weighed
Press the button, the fixed weighing value will be displayed.
The indicator HOLD appears.
The weighing value will be held in the display until it is deleted by .
5.8 Weighing Units
1. How to enable weighing units
Switch on the balance and during selftest press , „Pn“ will be displayed.
Press , , subsequently.
Acknowledge with . The first function „F0 di“ is displayed.
Press repeatedly until „F5 Unt“ will be displayed
24 HFT-BA-e-1310
Press , the current setting will be displayed.
To enable [on] / disable [off] the displayed weighing unit, press
Acknowledge with , the active setting of the next weighing unit will be
displayed.
To enable [off] / disable [on] the displayed weighing unit, press .
Press , balance returns to menu
Return to weighing mode using
2. How to change weighing units
To return to the previously enabled weighing units go to weighing mode by .
HFT-BA-e-1310 25
5.9 Totalization
Prerequisite: Totalizing function „F11 ACC“ on setting „on“, see chap. 6.2.
be deleted.
No.
1
N :
100.0KG
C
100.0KG
With this function the individual weighing values are added into the summation
memory by pressing and edited, when an optional printer is connected.
• With active totalizing function the indicator „M+“ is displayed
• The totalizing function is not active when the weight is under 20d.
• Totalizing is only possible in weighing mode.
• The data output depends on the menu setting „F7 Prt“.
• When switching-over to another weighing unit the summation memory will
Hook-on the item to be weighed A.
Wait until the stability display “STABLE” appears, then press .
„n001“ followed by the weight value will be displayed. The weight is added to the
summation memory and printed if an optional printer is connected, depending on
the menu setting „F7 Prt“.
Printout example YKB-01N (menu setting „F7 PrtPrt 5“):
26 HFT-BA-e-1310
Remove the weighed good. More weighed goods can only be added when the
No.
2
N :
100.0KG
C
200.0KG
display ≤ zero.
Suspend the item to be weighed B.
Wait until the stability display appears, then press . Weighing value will be
added to summation memory and possibly printed.
The number of weighing actions „n002“, followed by the total weight will be
displayed for 2 sec. After that the current weighing value is displayed.
Printout example YKB-01N (menu setting „F7 PrtPrt 5“):
Add more weighed goods as described before.
Please note that the crane scales must be unloaded between the individual weighing
procedures.
You can repeat this process until the capacity of the crane scales is exhausted.
HFT-BA-e-1310 27
Display the summation memory:
NO.
2
C
200.0KG
If you see a display of zero , press and the number of weighings, followed by the
total weight will be shown for 2 sec and printed if an optional printer is connected.
Printout example YKB-01N (menu setting „F7 PrtPrt 5“):
28 HFT-BA-e-1310
Delete total added memory:
When zero is displayed press , the number of weighings followed by the total
weight will be displayed for 2 sec. During this display press again.
The data in the summation memory are deleted, the indicator „M+“ extinguishes.
5.10 Automatische Nullpunktkorrektur
Under this menu item the automatic zero point correction can be switched on or off.
In enabled status the zero point will be corrected automatically, selectable 0.5d – 4 d
(see chap.6.2, Menu item “F1 A20“)
Invoke menu item „F1 A20“, see chap. 6.1
Press , the current setting will be displayed.
Select the desired setting by pressing
Acknowledge with .
Return to weighing mode using
HFT-BA-e-1310 29
6 Menu
will be displayed.
6.1 Navigation in the menu:
Call function
Switch on the balance and during selftest press ,
„Pn“ will be displayed.
Press , , subsequently.
Acknowledge with .
The first function „F0 di“ is displayed.
Select function
Select setting
Change settings
With help of , the individual functions can be
selected one after the other.
Confirm selected function by . The current setting
Switch into the available settings using .
Confirm setting
Exit menu / Return to
weighing mode
30 HFT-BA-e-1310
Acknowledge with or reject with
Press button
6.2 Menu overview
Available
settings
Function
How to change readability
Automatic zero point
correction
(zero tracking)
Description
High *
Low
d (low)
d (high)
cap
3 t 10kg 5kg 2kg 2kg 1kg 500g
5 t 10kg 5kg 2kg 2kg 1kg 500g
10 t 20kg 10kg 5kg 5kg 2kg 1kg
15 t 50kg 20kg 10kg 10kg 5kg 2kg
AZ 0.5d 0.5 d
AZ 1d* 1 d
AZ 2d 2 d
AZ 4d 4 d
specialist with competent knowledge.
Modifications may only be carried out by a
Capacity
Background lighting
Select weighing unit
Automatic shutdown
function
3 000 kg 5 000 kg 7 500 kg 10 00 0 k g
15 000 kg 20 000 kg 30 000 kg
bK on* Background lighting of display is switched
on permanently
bK oFF Display background illumination off
bK AU
Automatic background illumination on when
weighing pate is loaded or key pressed.
Internal A/D converter value
kg on/off
lb on/off
oFF 5 min* Autom. shutdown after 5 minutes
oFF 10 min Autom. shutdown after 10 minutes
oFF 15 min Autom. shutdown after 15 minutes
oFF 30 min Autom. shutdown after 30 minutes
oFF 0 min Autom. shutdown disabled
HFT-BA-e-1310 31
Interface parameters
Cont* Continuous data output
printout examples see chap. 8.4
Prt 1 Not documented
Prt 2 Not documented
Prt 3 Not documented
Prt 4 Data output format 4,
Printout example see chap. 8.4
Prt 5 Data output format 5,
Printout example see chap. 8.4
Adjustment see chap. 7
Baud rate
Adding function
* default setting
Selectable 1200, 2400, 4800, 960 0*
Not documented
on Totalizing function switched on
off Totalizing function switched off
32 HFT-BA-e-1310
7 Adjustment
• The weight to be used depends on the capacity of the scale. Carry
chapter 1) is required for stabilization.
As the acceleration value due to gravity is not the same at every locati on on ear th ,
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.
Procedure:
out adjustment as near as possible to the scale’s maximum weight.
Info about test weights can be fou nd on the Internet at:
http://www.kern-sohn.com.
• Observe stable environmental conditions. A warming up time (see
Switch-on balance and during the selftest press .
„Pn„ will be displayed.
Use the numeric keys to enter password:
Press , , subsequently.
Acknowledge with button .
„F0 di“ will be displayed
Press the button repeatedly until „F8 CAL” will be displayed.
Press button, „ULoAd“ will be displayed.
Unload the balance and wai t until the symbol „STABLE“ lights up.
Press the button, the currently set adjustment weight is displayed after some
seconds.
In order to change, select the numbers to be changed using the button and
set the desired value using the button, the respective active digit flashes.
HFT-BA-e-1310 33
Confirm by , „LoAd“ will be shown.
Attach the adjustment weight and wait until the symbol „STABLE“ lights up.
Press button
After successful adjustment the balance carries out a selftest, then it
automatically returns to weighing mode.
An adjusting error or incorrect adjusting weight will be indicated by the error
message; repeat adjustment procedure.
34 HFT-BA-e-1310
8 Data output RS 232
You can print weighing data via the RS 232C interface by pressing via the
interface according to the setting in the menu.
This data exchange is asynchronous using ASCII - Code.
The following conditions must be met to provide successful communication between
the weighing balance and the printer.
Use a suitable cable to connect the display unit to the interface of the printer.
Faultless operation requires an adequate KERN interface cable.
Communication parameters of display unit and printer must match (baud rate see
chap. 6.2, Menu item ,)
8.1 Technical data
8.2 Technical data
Connection: Pin allocation plug
Pin 2 input
Pin 3 output
Pin 5 signal earth
Baud-Rate: 600, 1200, 2400, 4800, 9600 selectable
Parity 8 bits, no parity
8.3 Continuous data output
Con1: Weighing mode
HEADER1: ST=STABLE， US=UNSTABLE
HEADER2: N=NET， GS=GROSS
HFT-BA-e-1310 35
8.4 Printer mode
1.weighing
2.weighing
Total
N :
100
N :
100
No.
2 C
200KG
1.weighing
2.weighing
Total
No.
1
No.
2 G
100KG
G
100KG
No.
2 C 100KG
C
200KG
C 200KG
GS
Gross weight
N
Net weight
No.
Number weighing processes
C
Total of all individual weighings
ST
Stable weighing values
Printout examples printer KERN YKB-01N:
Menu setting „F7 PrtCont“:
St, GS, + 100 kg
Menu setting „F7 PrtPrt 4“:
Menu setting „F7 PrtPrt 5“:
36 HFT-BA-e-1310
9 Error messages
Error
message
Description
Possible causes
Reduce load
been damaged
Zeroing range exceeded due
max)
Err 5
Keyboard error
Improper operation of the balance
Value outside the A/D changer
range
Damaged weighing cell
Damaged electronics
switched on
Capacity of rechargeable
battery exhausted
Recharge battery
--ol- Maximum load exceeded
to switching-on balance or
Err 4
pressing (normally 4%
Err 6
Err 10 No signal
Check whether the balance has
Load attached
Overload during setting to zero
Distance emitter / receiver too
long
Emitter (connecting box) not
Lo bA
Should other error messages occur, switch balance off and then on again. I f the err or
message remains inform manufacturer.
HFT-BA-e-1310 37
10 Cleaning, Maintenance and Disposal
Risk of injury and risk of material damage!
The crane scales are part of a hoisting device!
For a safe operation please observe the following:
Danger
Have carried out a regular maintenance by trained specialized
staff
Carry out regular maintenance and care, see chapter 10.2 and
10.3
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 crane scales by yourself. Repair may only be
carried out by service partners authorized by Messrs. KERN.
10.1 Cleaning and Disposal
Damage on the crane scales!
Do not use any industrial solutions or chemicals
CAUTION
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.
38 HFT-BA-e-1310
10.2 Regular maintenance and care
(see list, chap. 11.2).
000 weighings
500 000 weighings
• The regular 3-month maintenance may only be carried out by an expert with
competent knowledge of working with crane scales. Ther eby 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.
10.4).
• The additional results of the extended maintenance have to be entered in the
checklist (chapter 11.1).
• The replaced spare parts also must be entered, (chapter 11.2)
10.3 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 weighings
Every 5 years or
anyway after 250
• Check all dimensions, see checklist chap. 10.4
• Check the shackle or the eyelet for wear and tear, such as e.g.
plastic deformation, mechanical damage (unevenness), notches,
striation, cracks, corrosion, thread damage and torsions.
• Check the application of the safety bracket on the hook, moreover
check for fault and correct function
• For balances of big construction size: Check that the split pin and
the nut on the shackle are not loose
If a dimension exceeds the admitted deviation from the original
dimension (see checklist, chap. 10.4) or if other discrepancies have
been found, the balance must be repaired at once by trained
specialized staff (KERN customer service). Never do repair it by
yourself!
Take balance out of operation immediately!
All repairs and spare parts must be documented by the service partner
• 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
• All load carrying parts have to be exchanged by trained specialized
staff (KERN customer service).
Every 10 years or
anyway after
Note
During the revision for wear and tear please refer to the following drawings.
HFT-BA-e-1310 39
• Replace the crane balance entirely
10.4 Checklist „Regular maintenance“, (see chapter 10.3)
Original dimensions crane scales, serial no.: ………………………………… Capacity ………………………………
Shackle Hooks
a (mm) b (mm) c (mm) Wear and
Split pin&Nut d (mm) e (mm) f (mm) g ( mm)
Angle α (°)
Wear and tear Safety bracket
tear
Date ………………………………… Tester ………………………………………
*These data can be found in the document attached to the balance. Please keep this document always available.
Shackle Hooks
Split
pin&
Nut
tight
d e f g
10 % 5 % 5 % 5 %
Angle
α
10 °
Wear and tear
(see grey fields)
No deformation or
cracks
Safety
bracket
Perfect
working
order
Datum 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
a b c
5 % 0 % 5 %
Wear and tear
(see grey
fields)
No deformation
or cracks
15 months/62,500 x
18 months/75,000 x
21 months/87,500 x
HFT-BA-e-1310
40
Shackle Hooks
Max. admitted variation
24 months/100,000 x
27 months/112,500 x
30 months/125,000 x
33 months/137,500 x
36 months/150,000 x
39 months/162,500 x
42 months/175,000 x
45 months/187,500 x
48 months/200 000
51 months/212,500 x
a b c
5 % 0 % 5 %
Wear and tear (see
grey fields)
No deformation or
cracks
Split pin&
Nut
tight
d e f g
10 % 5 % 5 % 5 %
Angle
α
10 °
Wear and tear
(see grey fields)
No deformation or
cracks
Safety
bracket
Perfect
working
order
Datum Tester
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.
HFT-BA-e-1310
41
HFT-BA-e-1310
42
11 Enclosure
11.1 Checklist „Enhanced maintenance“ (General revision)
The enhanced maintenance has to be carried out by a service partner authorized by KERN.
Crane scales Model ………………………………….. Serial no. ……………………………………………..
Interval
12 months/50,000 x
24 months/100,000 x
36 months/150,000 x
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/450 000 x
120 months/500 000x
Magnetic powder
test for cracks
Replace crane scales entirely
Hooks Shackle
Screwed
connections
Datum Name Signature
HFT-BA-e-1310
43
11.2 List „spare parts and repair of safety-relevant parts“
Repair has to be carried out by a service partner authorized by KERN.
Crane scales Model ………………………………….. Serial no. ……………………………………………..
Part Action Datum Name Signature
HFT-BA-e-1310
44
Crane scales Model ………………………………….. Serial no. ……………………………………………..
Part Action Datum Name Signature
HFT-BA-e-1310
45
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