KERN VHM_M User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: [e-mail]
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating instructions
Pallet truck scales
KERN VHM_M
Version 1.2
07/2010
GB
VHM_M-BA-e-1012

GB KERN VHM_M
Version 1.2 07/2010
Operating instructions Pallet truck scale
Table of Contents
1Technical Data ................................................................................................... 3
2Declaration of conformity ................................................................................. 5
3Basic instructions for scales............................................................................ 6
3.1 Proper use .................................................................................................................................. 6
3.2 Improper Use.............................................................................................................................. 6
3.3 Warranty ..................................................................................................................................... 6
3.4 Monitoring of Test Resources ....................................................................................................7
4Basic safety instructions for scales ................................................................ 7
4.1 Pay attention to the instructions in the Operation Manual ......................................................... 7
4.2 Personnel training ...................................................................................................................... 7
5Transportation & Storage ................................................................................. 7
5.1 Testing upon acceptance ........................................................................................................... 7
5.2 Packaging / return transport ....................................................................................................... 7
6Unpacking, Setup and Commissioning ........................................................... 7
6.1 Site of installation, place of operation for scales ........................................................................ 7
6.2 Scope of supply .......................................................................................................................... 9
6.3 Rechargeable battery operation ................................................................................................. 9
6.4 Commissioning ........................................................................................................................... 9
7Display unit ...................................................................................................... 10
7.1 Overview of displays ................................................................................................................ 10
7.2 Keyboard overview................................................................................................................... 11
8Adjustment....................................................................................................... 12
8.1 Zeroing ..................................................................................................................................... 12
8.2 Performance of adjustment ...................................................................................................... 13
9Verification....................................................................................................... 19
10 Operation...................................................................................................... 21
10.1 Prior to weighing: ZERO-POINT CHECK................................................................................. 21
10.2 Gross weighing......................................................................................................................... 21
10.3 Net weighing............................................................................................................................. 21
10.3.1 Taring by pressing a button ............................................................................................. 21
10.3.2 Numerical input of tare (PRE-TARE)............................................................................... 22
10.4 Addition of individual weighings ............................................................................................... 23
11 Service, maintenance, disposal.................................................................. 25
11.1 Cleaning ................................................................................................................................... 25
11.2 Service, maintenance............................................................................................................... 25
11.3 Disposal.................................................................................................................................... 25
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VHM_M-BA-e-1012 3
1 Technical Data
KERN VHM 2T2M
Readability (d) 2 kg
Weighing range (max) 2000 kg
Minimum load (Min) 40 kg
Verification value (e) 2 kg
Verification class III
Reproducibility 2 kg
Linearity ± 2 kg
Recommended adjustment
weight, not added (class) 2 t (M1)
Warm-up time 10 min
Allowable ambient temperature -10° C .... + 40° C
Humidity of air max. 95 %
(not condensing)
12 V
Service life 35 h
Rechargeable battery
Loading time 6 h
Auto Off 30 min
Net weight 125 kg

Dimensions:
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2 Declaration of conformity
KERN & Sohn GmbH
D-72322 Balingen-Frommern
Postbox 4052
email: [email protected]
Phone: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.de
Declaration of conformity
Declaration of conformity for apparatus with CE mark
Konformitätserklärung für Geräte mit CE-Zeichen
Déclaration de conformité pour appareils portant la marque CE
Declaración de conformidad para aparatos con marca CE
Dichiarazione di conformità per apparecchi contrassegnati con la marcatura CE
English We hereby declare that the product to which this declaration refers conforms to the
following standards.
German Wir erklären hiermit, dass das Produkt, auf das sich diese Erklärung bezieht, mit den
nachstehenden Normen übereinstimmt.
Français Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la présente
déclaration, est conforme aux normes citées ci-après.
Español Manifestamos en la presente que el producto al que se refiere esta declaración está de
acuerdo con las normas siguientes
Italiano Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si riferisce è
conforme alle norme di seguito citate.
Electronic Scale: KERN VHB, VHE, VHS, VHT, VHM_M
Mark applied EU Directive Standards
2004/108/EC EN 55022 :1994 /A1 : 1995/A2 : 1997 Class A
EN 50082-1 : 1992
EN 61000-3-2 : 1995/A1: 1998 / A2:1998
EN 61000-3-3 : 1995
2006/95/EC EN 60950 : 1992/A1: 1993 / A3: 1995 / A4: 1997 / A11: 1997
Date: 14. Jan. 2010 Signature:
Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0,Fax +49-[0]7433/9933-149
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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
plate. 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“ in the balance. (Example: Slowly
draining fluids from a container on the balance.)
Do not leave permanent load on the weighing plate. 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

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.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 Transportation & 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
ÖKeep all parts of the original packaging for a possibly
required return.
ÖOnly use original packaging for returning.
6 Unpacking, Setup and Commissioning
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.
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On the installation site observe the following:
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-
center. 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.
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 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.
Because condensed water may arise in the electronic system, fast
temperature changes should be avoided. For acclimatization the balance
should be switched off in case of larger temperature differences.
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.
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6.2 Scope of supply
Serial accessories:
Pallet truck scales
Rechargeable battery
Battery recharging device
Operating instructions
6.3 Rechargeable battery operation
Rechargeable battery
The voltage supply takes place via an interchangeable battery module. With a full-
loaded rechargeable battery you can weigh approx. 35 hours without interruption.
If the loading status of the rechargeable battery is too low, the display shows: “LO-
BA”. If the battery is completely exhausted, the system switches off automatically.
It is recommended to reload the battery at least 6 hours. In that manner a loss of
rechargeable battery capacity is avoided.
When the system is used in shift work, it is recommended to purchase a
supplementary battery module.
The rechargeable battery is loaded using the delivered loading device. When loading,
the LED of the loading device is lighting. If the LED goes out, the rechargeable
battery is reloaded. An overloading of the rechargeable battery is not possible as the
loading device switches off automatically.
6.4 Commissioning
To activate the weighing system, press the button.
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, see chap. 10.1.
VHM_M-BA-e-1012 9

7 Display unit
7.1 Overview of displays
The three indicators provide the following information on the display unit:
◄The weighing system (incl. load) is stable
▬The indicated weight has a negative value
NET ◄The indicated value is a net weight
The following messages may appear on the display:
HELP 1 Weighing system overloaded
HELP 2 Taring impossible due to negative gross weight
HELP 3 Negative signal of load cells to A-D converter / slant
HELP 4 Entered tare weight too high. To cancel the HELP display press and
enter a new, reduced tare weight.
HELP 7 The signal of the load cells on the A-D converter is too high.
LO-BA The rechargeable battery load status is too low; charge the
rechargeable battery.
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7.2 Keyboard overview
Each key provides an operating as well as an input function.
Operating function Input function
Zero setting and
automatic tare
Confirm and segment to the left
Input of tare
ÐLower value in the flashing segment
Adding
ÏIncrease value in the flashing segment
On / Off Delete
IMPORTANT
The actuation of a key will only be accepted if the load is stable (message “load
stable” lit up). The display unit only carries out functions as long as the load is stable.
WARNING
If the weighed weight exceeds the set maximum, the display will show: “ERRO2”. To
prevent damage to the display unit or at the weighing cells, please lighten the load of
the weighing system instantly.
VHM_M-BA-e-1012 11

8 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 during the initial start-up, after change in
location and variation of surrounding 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 1) is
required for stabilization. Ensure that the system is unloaded. The system should be
lifted by approx. 2 lifting index marks and stand absolutely clear.
In verified weighing systems observe the check number.
After switching on the display unit the check number is displayed. This
number will be automatically adjusted after every interference. In verified
systems this number is an integral part for conformity evaluation. With that it
is always possible to check whether a new adjustment has been carried out.
In order to display the check number, switch off and switch on the system by
. The display unit shows subsequently e.g.:
Ö8888.8 (check of LCD segments)
ÖP 7.3 (software no.)
Ö14325 (check number)
Ö0 (weighing mode)
The verification is not valid, when the check number of the system does not
match with the check number on the type plate.
8.1 Zeroing
¾Unload weighing system and switch on with .
¾Press approx. 8 sec until the display counts reverse from AF08 to AF00,
followed by a determined percentage, e.g. AP 6.4. This percentage must not be
more than 20.
¾After zeroing the system will automatically return into the standard weighing
mode.
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8.2 Performance of adjustment
The weighing system off the possibility to enter one or maximally three adjustment
points (multi-point adjustment). This has the advantage that even weighing systems
showing a non-linear weighing curve may be easily adjusted within the required
limits.
1. Adjustment with one adjusting point
After zeroing (see chap. 8.1) the old adjustment points must be set to „zero“ as
follows.
¾Start weighing system by pressing .
¾Press approx. 18 seconds. The display will disappear. Keep pressed until
the value of the first adjustment point appears.
The lower indicator Wat the left edge of the display flashes
¾Call up the three old adjustment points using (Ð) or (Ï), whereby the
indicator at the left edge of the display moves upwards from the bottom.
When adjusting with only one adjustment point, the second and the highest
value must be set to „zero“ as follows.
¾Press (Ð) or (Ï) until the second adjustment point appears. The
central indicator bar flashes.
¾Press , first digit is flashing.
¾Use (Ð) or (Ï) to set the flashing digit to zero.
¾Press , the display changes to the following digit.
VHM_M-BA-e-1012 13

¾Use (Ð) or (Ï) to set the flashing digit to zero.
¾Repeat this process for every digit.
¾After zeroing the last digit press , the indicator bar flashes.
¾Press (Ð) or (Ï) until the highest adjustment point appears. The upper
indicator Wflashes.
¾Press , first digit is flashing.
¾Use (Ð) or (Ï) to set the flashing digit to zero.
¾Repeat this process for every digit.
¾After zeroing the last digit press , the upper indicator Wflashes.
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¾To adjust with one adjustment point press (Ð) or (Ï) until the first
adjustment point will be displayed. The lower indicator Wflashes.
¾System loaded with the adjustment weight. To enter the adjustment weight
press , the first digit flashes.
¾To change the flashing digit, press (Ð) or (Ï) so many times until the
desired value will appear.
¾Confirm input by .
¾Change to the following digit using and if necessary, change and
acknowledge as described before.
¾Repeat this process for every digit.
¾After changing and confirming the last digit, the lower indicator Wwill flash.
¾For acknowledgement press 3 seconds. The display counts reverse from
AF08 to AF00, the first adjustment point is set.
¾To exit the adjustment mode press or until AP XX appears.
¾Keep pressed until the display vanishes.
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2. Multi-point adjustment
The balance must be turned on and reset to zero (see chap. 8.1).
¾Press approx. 18 seconds. The display will disappear. Keep pressed until
the value of the first adjustment point appears.
The lower indicator Wat the left edge of the display flashes
¾System loaded with the first adjustment weight. To enter the adjustment weight
press , the first digit flashes.
¾To change the flashing digit, press (Ð) or (Ï) so many times until the
desired value will appear.
¾Confirm input by .
¾Change to the following digit using and if necessary, change and
acknowledge as described before.
¾Repeat this process for every digit.
¾After changing and confirming the last digit, the lower indicator Wwill flash.
¾For acknowledgement press 3 seconds. The display counts reverse from
AF08 to AF00, the first adjustment point is set.
¾Press (Ï), the second adjustment point is displayed. The central indicator
bar flashes.
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¾System loaded with the second adjustment weight. To enter the adjustment
weight press , the first digit flashes.
¾To change the flashing digit, press (Ð) or (Ï) so many times until the
desired value will appear.
¾Confirm input by .
¾Repeat this process for every digit.
¾After changing and confirming the last digit, the central indicator -will flash.
¾For acknowledgement press 3 seconds. The display counts reverse from
AF08 to AF00, the second adjustment point is set.
¾Press (Ï), the third adjustment point is displayed. The upper indicator W
flashes.
¾System loaded with the third adjustment weight. To enter the adjustment weight
press , the first digit flashes.
¾To change the flashing digit, press (Ð) or (Ï) so many times until the
desired value will appear.
¾Confirm input by .
VHM_M-BA-e-1012 17

¾Repeat this process for every digit.
¾After changing and confirming the last digit, the upper indicator Wwill flash.
¾For acknowledgement press 3 seconds. The display counts reverse from
AF08 to AF00, the second adjustment point is set.
¾To exit the adjustment mode press or until AP XX appears.
¾Keep pressed until the display vanishes.
ÖAfter adjustment the display device remains automatically in the
higher resolution. After switching off and on the factory-side
resolution will be displayed again.
ÖIf you readjust adjusted scales with the help of multi-point
adjustment, you should use the smallest weight first, followed by the
medium weight and finally the greatest weight.
ÖIf an incorrect value that cannot be reset was entered during the
adjustment, switch the scales off and start right from the beginning.
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9 Verification
General hints:
According to EU directive 90/384/EEC balances must be verified if they are used as
follows (legally controlled area):
a) For commercial transactions if the price of goods is determined by weighing.
b) For the production of medicines in pharmacies as well as for analyses in the
medical and pharmaceutical laboratory.
c) For official purposes.
d) For manufacturing final packages.
In cases of doubt, please contact your local trade in standard.
After verification the balance is sealed at the indicated positions.
Verification notes:
An EU type approval exists for the weighing system described in its technical data as
verifiable. If the weighing system is used where obligation to verify exists as
described above, it must verified and re-verified in regular intervals.
Re-verification of a weighing system is carried out according to the respective
national regulations. The validity for verification of weighing systems in Germany is
e.g. 2 years.
The legal regulation of the country where the balance is used must be observed!
Check number:
After switching on the display unit the check number is displayed. This number will be
automatically adjusted after every interference. In verified systems this number will
be recorded by the weights and measures inspector. With that it is always possible to
check whether a new adjustment has been carried out.
In order to display the check number, switch off and switch on the system by . The
display unit shows subsequently e.g.:
Ö8888.8 (check of LCD segments)
ÖP 7.3 (software no.)
Ö14325 (check number)
Ö0 (weighing mode)
VHM_M-BA-e-1012 19

•The verification is not valid when the check number of the system does not
match with the check number on the type plate.
•Verification of the weighing system is invalid without the "seal".
•After destruction of the seal the balance must be re-verified by an
authorised agency and a new verification wire/seal mark fitted before it can
be reused for applications subject to verification.
•The verifiable model of the weighing system will display stripes only if a
slant exceeds 2°. If this is the case, place the weighing system on an
even base.
Position of the official seals:
Inclination switch:
In verifiable models off-centre loads, or slants affecting accuracy, activate the
inclination switch which in turn disconnects the display.
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