KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating manual
Pallet truck scale
KERN VHE-A
Version 1.1
01/2014
GB
D-72336 Balingen
Fax: +49-[0]7433-9933-149
VHE-A-BA-e-1411
KERN VHE-A
Operating instructions Pallet truck scale
GB
Version 1.1 01/2014
Contents
1 Technical data ................................................................................................... 3
1.1 Dimensions ................................................................................................................ 4
2 Appliance overview ........................................................................................... 5
2.1 Overview of display .................................................................................................... 5
2.2 Keyboard overview .................................................................................................... 6
2.2.1 In weighing mode: ....................................................................................................................... 6
3 Basic instructions for scales ........................................................................... 7
3.1 Proper use ................................................................................................................. 7
3.2 Improper Use ............................................................................................................. 7
3.3 Warranty .................................................................................................................... 7
3.4 Monitoring of Test Resources .................................................................................... 8
4 Basic safety instructions for scales ................................................................ 8
4.1 Pay attention to the instructions in the Operat ion Manual .......................................... 8
4.2 Personnel training ...................................................................................................... 8
5 Transport and storage ...................................................................................... 8
5.1 Testing upon acceptance ........................................................................................... 8
5.2 Packaging / return t ransport ...................................................................................... 8
6 Unpacking and placing ..................................................................................... 9
6.1 Site of installation, place of operat ion for scales ........................................................ 9
6.2 Scope of delivery
......................................................................................................10
7 Adjustment ....................................................................................................... 11
7.1 Zero-setting ..............................................................................................................11
8 Commissioning ............................................................................................... 16
8.1 Switch on the pallet truck scale .................................................................................17
8.2 Switch off the pallet truck scale .................................................................................17
8.3 Weighing ..................................................................................................................18
8.4 Zero point correction .................................................................................................19
8.5 Taring .......................................................................................................................19
8.6 Totalization ...............................................................................................................20
8.7 Display stored weighing data ....................................................................................20
8.8 Delete the saved weighing data ................................................................................20
8.9 Battery operation ......................................................................................................21
9 Error messages ............................................................................................... 22
10 Servicing, maintenance, disposal .............................................................. 23
10.1 Clean ........................................................................................................................23
10.2 Ser vicing, m aint enanc e.............................................................................................23
10.3 Disposal ....................................................................................................................23
11 Instant help ................................................................................................... 24
2 VHE-A-BA-e-1411
1 Technical data
KERN VHE 2T5A
Readability (d) 5 kg
Weighing range (max) 2000 kg
Reproducibility 20 kg
Linearity ± 30 kg
Stabilization time 3 sec.
Allowable ambient temperature -10° C .... + 40° C
Humidity of air
Weighing unit kg
Electric Supply 2 x 1.5V AA batteries
Operating period 100 h
Auto Off 3 min
Net weight 65 kg
max. 95 %
(not condensing)
VHE-A-BA-e-1411 3
A
Fork length
1150 mm
B
Fork width
150 mm
A
F D C
E
B
102°
102°
1.1 Dimensions
C Minimum fork height 83 mm
Clearance 30 mm
D Maximum fork height 205 mm
Hoisting height 122 mm
E Width across forks 520 mm
F Height upper edge of display 575 mm
4 VHE-A-BA-e-1411
Load lifted too high; upper arrow is flashing
Reference height reached
Reference height almost reached, very slow lifting, 1 arrow lighting
Slowly lifting, 2 arrows lighting
Fast lifting, 3 arrows lighting
The displayed weight value is negative
M
Weight is stored
KG
Weight value in kg
Batteries of the display unit are empty; exchange batteries
2 Appliance overview
2.1 Overview of display
VHE-A-BA-e-1411 5
Short key pressing
• Zeroing
• Switch on balance
memory
long pressing of button
(>3 sec)
• Call up subtotal
very long pressing of
(>10 sec)
• Delete memory
Press both buttons at the
displayed.
2.2 Keyboard overview
2.2.1 In weighing mode:
Operation
• Add weight to sum
button
same time until OFF is
• Switch off system
6 VHE-A-BA-e-1411
3 Basic instructions for scales
3.1 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 manually and carefully placed in the centre of the weighing
pan. As soon as a stable weighing value is reached the weighing value can be read.
3.2 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 on the balance.)
Do not leave permanent load on the weighing pan. This may damage the measuring
system.
Impacts and overloading exceeding the stated maximum load (max) of the balance,
minus a possibly existing tare load, must be strictly avoided. Balance may be
damage by this.
Never operate balance in explosive environment. The serial version is not explosion
protected.
The structure of the balance may not be modified. This may lead to incorrect
weighing results, safety-related faults and destruction of the balance.
The balance may only be used according to the described conditions. Other areas of
use must be released by KERN in writing.
3.3 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
• The appliance is improperly set up or incorrectly electrically connected
• The measuring system is overloaded
VHE-A-BA-e-1411 7
3.4 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.
4 Basic safety instructions for scales
4.1 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.
All language versions contain a non-binding translation.
The original German is binding.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 Transport and storage
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
5.2 Packaging / return transport
Keep all parts of the original packaging for a possibly
required return.
Only use original packaging for returning.
8 VHE-A-BA-e-1411
Incorrect lifting of a load
Correct lifting of a load
6 Unpacking and placing
6.1 Site of installation, place of operation for scales
The balances are designed in a way that reliable weighing results are achieved in
common conditions of use.
You will work accurately and fast, if you select the right location for your balance.
On the installation site observe the following:
The load must be lifted clear of the display unit’s case and other pallets.
The load must be lifted evenly distributed, so that it has the lowest
measurement insecurity (deviations up to 0.8% of the capacity may occur).
Inclined position of the weighing system can falsify the weighing result. Holes
and unevenness, too, have this effect. A smooth floor is ideal.
VHE-A-BA-e-1411 9
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 offcentre. This may result in diminished accuracy.
Avoid jarring during weighing
Protect the balance 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.
6.2 Scope of delivery
Serial accessories:
• Pallet truck scales
• 2 x 1.5V AA batteries
• Operating manual
10 VHE-A-BA-e-1411
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.
Observe stable environmental conditions. A warming up time (see chapter Fehler!
Verweisquelle konnte nicht gefunden werden.) is required for stabilization.
Ensure that the system is not loaded. The system should be lifted by
approximately 2 lifting index markings and stand absolutely free.
7.1 Zero-setting
Unload the weighing system and switch-on with TOTAL.
If the weighing system does not display „0“, press ZERO
VHE-A-BA-e-1411 11
How to carry out adjustments
Switch off weighing system
Press for 30 sec., PAR is displayed
Press until CAL is displayed
Press , ZERO is displayed flashing, because the
reference height is not reached yet
Place a pallet and adjust the reference height, when the
reference height is reached, the display stops flashing and
only the right-hand bar above in the display continues to be
displayed.
Press for approx. 3 sec., the count down fur setting
the first adjustment point runs automatically.
The weight of 1000 kg for the first adjustment point is
displayed. One point (=1. adjustment point) is displayed
before the cipher.
Place 1000 kg
After placing the weight the weighing system leaves the
reference height, the display flashes
Bring the weighing system on reference height, the display
stops flashing
12 VHE-A-BA-e-1411
displayed
procedure.
Press for approx. 3 sec., the count down for setting
the second adjustment point runs off automatically.
The weight for the second adjustment point is displayed.
Moreover two points appear in the display.
Place 2000 kg
After placing the weight the weighing system leaves the
reference height, the display flashes
Place the weighing system on reference height, the display
stops flashing.
Press for approx. 3 sec., the count down for setting
the third adjustment point runs off automatically, 0 is
Remove weight.
Press , vU004 is displayed, followed by PAr
Press for approx. 3 sec., SAVE is displayed,
followed by 0.
The balance is now in weighing mode.
Adjustment now has finished.
An adjusting error or incorrect adjusting weight will be
indicated by the error message; repeat adjustment
VHE-A-BA-e-1411 13
Carry out adjustment by entering the adjustment weight
Switch off weighing system
Press for 30 sec., PAR is displayed
Press until CAL is displayed
Press , ZERO is displayed flashing, because the
reference height is not reached yet
Place a pallet and adjust the reference height, when the
reference height is reached, the display stops flashing and
only the righthand bar above in the display continues to be
displayed.
Press for approx. 3 sec., the count down runs off
automatically.
.1000 is displayed.
Press 2 x , 0 is displayed
Press shortly, the display for entering the
adjustment weight is displayed, the right digit flashes.
Use both keys to enter the desired adjustment weight:
Use to alter cipher, use to change the digit
(example)
INFO: when entering 1500 kg = enter 15000 (example). With the other values
proceed in the same way: the last zero will not be considered:
14 VHE-A-BA-e-1411
the error
Acknowledge by .
Place the set weight and set the reference height
Press for approx. 3 sec., the count down runs off
automatically, followed by the program version and Save.
Then the balance returns automatically into the weighing mode.
Adjustment now has finished.
An adjusting error or incorrect adjusting weight will be indicated by
message; repeat adjustment procedure.
VHE-A-BA-e-1411 15
8 Commissioning
Correct weighing only possible at „reference height “
(see fig. 1 and 2)
Actuate repeatedly the drawbar handle (hand lever 1 downwards. fig.1) until the
reference height is reached. In the display appears see fig.2.
Fig. 1
Fig. 2
If the pallet truck scale is not in reference height, the weight
value in the display appears flashing.
Place the pallet truck scale into reference height, the display
does not more flash.
16 VHE-A-BA-e-1411
8.1 Switch on the pallet truck scale
Switch on the pallet truck scale using key,
the balance carries out a selftest and changes then
to the zero display
8.2 Switch off the pallet truck scale
Press the buttons and at the same
time until OFF appears.
After that the display extinguishes.
(example)
The display extinguishes automatically when the buttons have
not been pressed for two minutes or if the system is not used.
VHE-A-BA-e-1411 17
8.3 Weighing
Switch on the pallet truck scale using key,
the balance carries out a selftest and changes then
to the zero display „0“ is displayed flashing.
If „0“ is not displayed, press
Let the pallet truck scale lower onto the lowest point.
Three arrows are lighting up when the lowest point is
reached.
Take up the load and lift till to reference height.
Three arrows are lighting up. The weight value is
displayed flashing. Continue lifting the load.
Two arrows are lighting up. Lift slowly
A arrow is lighting up. Lift slowly.
The reference height is reached. The symbol
displayed. The display of the weight value does not
more flash.
The upper arrow is lighting up, when a load has been
lifted too high up. Lower the pallet truck scale
completely till to the ground to start a new weighing.
is
18 VHE-A-BA-e-1411
8.4 Zero point correction
Switch on pallet truck scale using button.
Check whether the forks of the pallet truck scale are
empty
Lift pallet truck scale till to the reference height (see
chap. 8, fig. 1).
If the display does not show zero, reset display using
8.5 Taring
Lift weighing container till to the reference height (see chap. 8, fig. 1).
Switch on pallet truck scale using button.
The weight of the weighing container is displayed.
Tare using button.
Fill material to be weighed in the container, the net
weight is displayed.
If the container is removed from the balance, the tare
weight is displayed as a negative value. The tare
weight remains stored until the button is
pressed anew or the balance is switched off.
VHE-A-BA-e-1411 19
Total weight
8.6 Totalization
The display unit offers an option that allows the addition of weighing values and the
display of the total weight.
Pick up the load and bring it to reference height
Press . The value is stored and „M“ is
displayed.
The display alternately shows the consecutive
number (number of weighings) and the total weight.
After a few seconds the system automatically reverts
to standard weighing mode.
Add-up another load as described before. Observe
that the system must be unloaded between the
weighing procedures.
(example)
Number of weighing
procedures
8.7 Display stored weighing data
Press for approx. 3 sec, the number of weighing procedures
and the total weight are displayed alternately
8.8 Delete the saved weighing data
During display of the weighing data press shortly, data in the store
are deleted, the display changes automatically into weighing mode and the
„M“ extinguishes.
20 VHE-A-BA-e-1411
8.9 Battery operation
Power is supplied via 2 x 1.5V AA batteries. At a regular use with full batteries,
approx. 1 year can be weighed.
If the battery symbol is displayed, this means that the batteries will soon be
flat.
Change the batteries immediately.
If the capacity of the batteries is completely exhausted, the display will switch-off
automatically.
In order to save the battery, the balance switches automatically off after 3 minutes
without load changing.
If the balance is not used for a longer time, take out the batteries and store them
separately. Leaking battery liquid could damage the balance.
Change the battery as follows:
VHE-A-BA-e-1411 21
- O.L. -
The weighing system is overloaded. Remove the load
Err06
Load cell signal too high
Err07
Load cell signal too low
Err12
Calibration deleted
Err98
The calibration value must be higher than the former
value
Battery symbol flashes: The battery is almost empty
and has to be replaced (see chap. 8.9)
M
Flashing „M“: Memory is full, no more weights can be
added-up. Delete memory (see chap. 8.8)
9 Error messages
22 VHE-A-BA-e-1411
10 Servici ng, mai ntenance, disposal
10.1 Clean
Please do not use aggressive cleaning agents (solvents or similar agents), but a
cloth dampened with mild soap suds. Take care that the device is not penetrated by
fluids and polish it with a dry soft cloth.
10.2 Servicing, maintenance
The appliance may only be opened by trained service technicians who are
authorized by KERN.
The same maintenance guidelines as for standard manual lift truck without loaddisplay system.
General rules:
Pulling instead of pushing allows an easier handling of the load (steering
wheels on the side of the drawbar)
If the lifting device is not used, the manual lever should be left in centre
position. This prolongs the life span of the seals.
The display unit should only be cleaned with a damp cloth. Chemical cleaning
agents and a pressurized water jet cause damage.
To prevent damages to the electronic system and weighing cells it is
necessary that welding work on the entire weighing system is carried out
exclusively by technical specialists.
The bearings of the wheels as well as the joints in the load roller section
should be regularly cleaned and greased.
10.3 Disposal
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.
VHE-A-BA-e-1411 23
The displayed weight is permanently
11 I ns tant help
In case of an error in the program process, briefly turn off the balance and
disconnect from power supply. The weighing process must then be restarted from
the beginning.
Help:
Fault Possible cause
The displayed weight does not glow.
changing
-
The weighing value is obviously
wrong
• The balance is not switched on.
• The batteries are empty
• Draught/air movement
• Sites with vibration.
• Loading fork is in contact with foreign
matter.
• Electromagnetic fields / static charging
(choose different location/switch off
interfering device if possible)
• The display of the balance is not at zero
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Electromagnetic fields / static charging
(choose different location/switch off
interfering device if possible)
• Load fork has not been pumped to
reference height
Should other error messages occur, switch balance off and then on again. If the error
message remains inform manufacturer.
24 VHE-A-BA-e-1411
• The control pin is not in position
„Reference height“.
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