KERN VFB User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Pallet truck scales
KERN VFB
Version 1.1
2018-03
GB
VFB-BA-e-1811

VFB-BA-e-1811 2
GB
KERN VFB
Version 1.12018-03
Operating instructions Pallet truck scale
Contents
1Technical data ................................................................................................... 4
2Basic instructions about weighing system..................................................... 5
2.1 Proper use.................................................................................................................................. 5
2.2 Improper Use.............................................................................................................................. 6
2.3 Warranty..................................................................................................................................... 6
2.4 Monitoring of Test Resources .................................................................................................... 6
3Basic safety notes about weighing system .................................................... 7
3.1 Pay attention to the instructions in the Operation Manual.......................................................... 7
3.2 Personnel training....................................................................................................................... 7
4Transport and storage ...................................................................................... 7
4.1 Testing upon acceptance ........................................................................................................... 7
4.2 Packaging / return transport....................................................................................................... 7
5Unpacking, Setup and Commissioning........................................................... 8
5.1 Assembly of the pallet truck scale.............................................................................................. 8
5.1.1 Drawbar...................................................................................................................................... 8
5.1.2 Display Unit .............................................................................................................................. 10
5.2 Proper use of the lifting device................................................................................................. 10
5.3 Installation site, location of use of the weighing system........................................................... 11
5.4 Scope of delivery...................................................................................................................... 13
5.5 Mains connection...................................................................................................................... 13
5.6 Rechargeable battery operation............................................................................................... 13
5.7 Installation of battery pack........................................................................................................ 14
5.8 Commissioning......................................................................................................................... 14
5.9 Appliance overview................................................................................................................... 15
5.10 Overview of display .................................................................................................................. 16
5.11 Keyboard overview................................................................................................................... 17
5.11.1 Numerical input via the navigation buttons.......................................................................... 18
6Linearization.................................................................................................... 19
7Adjustment....................................................................................................... 22
7.1 Zero-setting .............................................................................................................................. 22
8Functions of display unit................................................................................ 24
8.1 Prior to weighing....................................................................................................................... 24
8.1.1 Zero-point check....................................................................................................................... 24
8.1.2 Net weighing: Taring by button................................................................................................. 24
8.2 Numerical tare input (PRETARE)............................................................................................. 25
8.2.1 Enter tare weight ...................................................................................................................... 25
8.2.2 Delete pretare value................................................................................................................. 25
8.3 Weighing................................................................................................................................... 26
8.3.1 Gross weighing......................................................................................................................... 26
8.3.2 Net weighing............................................................................................................................. 26
8.4 Weighing units switch-over....................................................................................................... 27
8.5 Weighing with tolerance range................................................................................................. 28
8.6 Manual totalizing....................................................................................................................... 30
8.7 Automatic adding-up................................................................................................................. 32
8.8 Animal weighing ....................................................................................................................... 33
8.9 Peak value function.................................................................................................................. 34

3 VFB-BA-e-1811
9Menu................................................................................................................. 35
9.1 Navigation in the menu............................................................................................................. 35
9.2 Menu overview ......................................................................................................................... 36
10 Servicing, maintenance, disposal .............................................................. 39
10.1 Clean ........................................................................................................................................ 39
10.2 Servicing, maintenance............................................................................................................ 39
10.3 Disposal.................................................................................................................................... 39
11 Error messages............................................................................................ 40
12 Instant help................................................................................................... 41

VFB-BA-e-1811 4
1 Technical data
KERN VFB 2T-3
Readability (d) 1 kg
Weighing range (max) 2000 kg
Reproducibility 1 kg
Linearity ± 2 kg
Warm-up time 10 min
Recommended
adjustment weight (not
added) class
1 t
( M1 )
Allowable ambient
temperature
-10° C .... + 40° C
Humidity of air
max. 95 %
(not condensing)
Weighing Units
kg, lb
Electric Supply
110V-230V AC
12 V, 500 mA
Rechargeable battery
7.2 V 2000 mAh
Operating period background illumination OFF: 40h
Service life background illumination ON: 20h
Loading time: 12 h
Auto Off
Options: 0, 3, 5, 10, 30 min
Net weight
126 kg
Fork height max: 200 mm
min: 85 mm
LCD-display
cipher height
22 mm

5 VFB-BA-e-1811
Dimensions in mm:
2 Basic instructions about weighing system
2.1 Proper use
The weighing system 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 manually and carefully placed in the centre of the
loading fork. As soon as a stable weighing value is reached the weighing value can
be read.

VFB-BA-e-1811 6
2.2 Improper Use
The weighing system is not suitable 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“ in the weighing system.
(Example: Slowly draining fluids from a container on the weighing system.)
Do not leave permanent load on the loading fork. This may damage the measuring
system.
Impacts and overloading exceeding the stated maximum load (max) of the weighing
system, minus a possibly existing tare load, must be strictly avoided. The weighing
system could be damaged.
Never operate the weighing system in an explosive environment. The serial version
is not explosion protected.
Changes to the weighing system's design are not permitted. This may lead to
incorrect weighing results, safety-related faults and destruction of the weighing
system.
The weighing system unit may only be operated in accordance with the described
default settings. Other areas of use must be released by KERN in writing.
2.3 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
•Improper setup or incorrect electrical connection
•The measuring system is overloaded
2.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
weighing system 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.

7 VFB-BA-e-1811
3 Basic safety notes about weighing system
3.1 Pay attention to the instructions in the Operation Manual
Carefully read this operation manual before setup and
commissioning, even if you are already familiar with KERN
balances.
3.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
4 Transport and storage
4.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
4.2 Packaging / return transport
Keep all parts of the original packaging for a possibly
required return.
Only use original packaging for returning.
Prior to dispatch disconnect all cables and remove
loose/mobile parts.
Reattach possibly supplied transport securing devices.
Secure all parts such as the glass wind screen, the
weighing platform, power unit etc. against shifting and
damage.

VFB-BA-e-1811 8
5 Unpacking, Setup and Commissioning
5.1 Assembly of the pallet truck scale
5.1.1 Drawbar
The drawbar is delivered separated from the hydraulic lifting device. Prior to
commissioning the two components must be connected to each other. Details see
below.

Loosen the screw for adjustment
of hydraulics
Pass the draw chain of the drawbar through the opening and after that through
the bolt in the pallet truck scale

9 VFB-BA-e-1811

Fix the grab handle using 3 screws
Insert rod at the lower end of the
draw chain at the oblong hole of
the hydraulic lever till to the
stopper
To start-up the lifting mechanism
screw down the adjustment screw
till to the preset stopper

VFB-BA-e-1811 10
5.1.2 Display Unit
Fasten the display device with both
turning knobs (1) on the pallet truck
scale and screw-in the load cell
cable (2) into the connection of the
display device.
5.2 Proper use of the lifting device
Lower the loading fork
Move the load
Lift the loading fork

11 VFB-BA-e-1811
5.3 Installation site, location of use of the weighing system
The weighing system is designed to achieve reliable weighing results under normal
conditions of use.
You will work accurately and fast, if you select the right location for your weighing
system.
Therefore, observe the following for the installation site:
The load must be lifted clear of the display unit’s case and other pallets.
Incorrect lifting of a load
Correct lifting of a load
The accuracy of the weighing system is falling by approximately 0.1 % per
degree if there is a slant of more than 2°. Holes and unevenness, too, have
this effect. A smooth floor is ideal.
Optimum accuracy in weighing results is achieved if the load centre is
between the forks. The forks are easily bent and twisted when the load is off-
centre. This may result in diminished accuracy.
In verifiable models off-centre loads, or slants affecting accuracy, activate the
inclination switch which in turn disconnects the display.

VFB-BA-e-1811 12
Non-optimal positioning of load
Optimal positioning of load
Temperature range: The maximum deviation for 0.1% of the weighed load is
between -10 and +40°C. Outside this temperature range deviations of up to
0.3% may occur.
Avoid jarring during weighing
Protect the weighing system against high humidity, vapours and dust
Do not expose the device to extreme dampness for longer periods of time.
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.
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.
Pallet
Load

13 VFB-BA-e-1811
5.4 Scope of delivery
Serial accessories:
•Pallet truck scales
•Battery 7.2V/2000 mAh
•Mains adapter
•Hexagon screw driver
•Operating manual
5.5 Mains connection
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage. Only use original KERN mains adapters. Using other
makes requires consent by KERN.
5.6 Rechargeable battery operation
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 12 hours.
The appearance of the rechargeable battery symbol in the weight display indicates
that the battery is almost exhausted. The unit will be ready for operation for approx.
another 10 hours before switching off automatically. Charge the battery with the help
of the supplied power pack. During the loading process the rechargeable battery
symbol is displayed flashing.
The rechargeable battery symbol shows the charge status of the rechargeable
battery:
Voltage has dropped below prescribed minimum.
Rechargeable battery very low.
Rechargeable battery is completely charged (rechargeable battery
symbol flashes while loading)

VFB-BA-e-1811 14
5.7 Installation of battery pack
4 Loosen the screws in the
casing of the display rear
part.
Loosen and remove two
upper and two bottom
screws. Replace the pack
of batteries. Fix and screw
the display casing back.
5.8 Commissioning
Prior to starting-up the weighing system, load the rechargeable battery completely.
To activate the weighing system, press the key.
The operating temperature for the electronic system and the weighing cells will have
been reached after three to five minutes. . Prior to this, deviations of c. 0.3% are
possible.
Loads should not be lifted before this zero adjust is complete.

15 VFB-BA-e-1811
5.9 Appliance overview
1
Manual lever
2
Drawbar
3
Display Unit
4
Load forks
5
Connection of mains adapter
6
Turning knobs
7
Load cell cables
Manual lever
(Hand lever + Drawbar = Lifting device)

VFB-BA-e-1811 16
5.10 Overview of display
Display Significance
Charging status of rechargeable battery
STABLE Stability display
ZERO Zero indicator
GROSS Gross weight
NET Net weight
AUTO Automatic add-up enabled
M+ Totalization
HI
OK
LO Indicators for weighing with tolerance range

17 VFB-BA-e-1811
5.11 Keyboard overview
Key Function
•Turn on/off
•Zeroing
Navigation button
•Confirm entry
•Taring
•Invoke pre-tare-function (press button long time)
Navigation button •At numeric input increase flashing digit
•Scroll forward in menu
•Add weighing value to summation memory
•Display sum total
•Calculate weighing data via interface
C
•Delete
•Change between gross and net weight
Navigation button 
•Digit selection to the right
•Switch-over weighing unit
ESC
•Back to menu/weighing mode

VFB-BA-e-1811 18
Actuation of a button is only accepted, when the load is stable (and
the stability display „STABLE“ is illuminated). The display unit only
carries out functions as long as the load is stable.
5.11.1 Numerical input via the navigation buttons
Key
Navigation
keys
Function
Arrow key
Increase flashing digit
Arrow key
Digit selection to the left
Delete
Arrow key
Digit selection to the right
Arrow key Terminate input

19 VFB-BA-e-1811
6 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 testing instrument control, you can
improve this by means of linearization.
•Carrying out linearization is restricted to specialist staff possessing well
acquainted with the workings of weighing scales.
•The test weights to be used must be adapted to the weighing scale’s
specifications; see chapter 2.4 “Testing instruments control”.
•Observe stable environmental conditions. Stabilisation requires a certain
warm-up time.
•After successful linearization you will have to carry out an adjustment.

VFB-BA-e-1811 20
Call up menu
Press and at the same time in weighing mode.
The first menu block is displayed.
Press repeatedly until is displayed.
Press , password query will appear.
Press subsequently , , until the first menu item is
shown.
Press , will be shown.
Confirm by , will be displayed.
Confirm by , will be displayed.
Press repeatedly until is displayed.
Confirm with , select desired setting by
= adjustment see chap. 7
= linearization, see chap. 6