Load Cell Systems TLM8 User manual

ENGLISH ENGLISH ENGLISH ENGLISH
Installation and User Manual
version 1.06
TLM8

SYMBOLS
Here are the symbols used in the manual to draw the reader's attention:
Caution! Risk of electric shock.
Caution! This operation must be performed by skilled personnel.
Pay particular attention to the following instructions.
Further information.
WARRANTY
24 months from the date of the delivery note. Warranty covers only failures of defective components (due to construction
defects or defects in materials) and includes replacement or repair of the components and related labor costs.
Warranty is automatically forfeited in the event of:
- tampering, deletion, removal of the identification label and/or serial number of the product
- misuse, transformation, alteration, repair of products not carried out by Laumas personnel
Laumas provides a 1-year warranty from the date of the delivery note on defects in material or manufacture of the battery.
GUIDELINES FOR PROPER DISPOSAL
This symbol on the product or packaging indicates that:
-This is electrical/electronic equipment and cannot be disposed of as municipal solid waste, but must be delivered
to a recycling center
-Improper use or disposal can pollute the environment or damage human health
-Non-compliance with these guidelines will be penalized in accordance with the regulations in force in the country
of destination
-It is recommended to dispose of the packing and packaging as required by local regulations

TABLE OF CONTENTS
USER WARNINGS ................................................................................................................... 1
RECOMMENDATIONS FOR CORRECT INSTALLATION OF WEIGHING INSTRUMENTS . 1
RECOMMENDATIONS FOR CORRECT INSTALLATION OF THE LOAD CELLS................ 2
LOAD CELL INPUT TEST (QUICK ACCESS) .......................................................................... 4
LOAD CELL TESTING............................................................................................................... 4
MAIN SPECIFICATIONS OF THE INSTRUMENT................................................................... 5
TECHNICAL SPECIFICATIONS .............................................................................................. 6
ELECTRICAL CONNECTIONS................................................................................................ 7
BASIC INFORMATION............................................................................................................... 7
WIRING DIAGRAM..................................................................................................................... 7
KEYS AND SYMBOLS FUNCTIONS....................................................................................... 9
MENU MAP ............................................................................................................................ 10
SETPOINT ................................................................................................................................ 10
SYSTEM PARAMETERS ......................................................................................................... 10
INSTRUMENT COMMISSIONING.......................................................................................... 12
PROGRAMMING OF SYSTEM PARAMETERS.................................................................... 13
THEORETICAL CALIBRATION............................................................................................... 13
MAXIMUM CAPACITY .......................................................................................................................14
TARE WEIGHT ZERO SETTING .......................................................................................................14
ZERO VALUE MANUAL ENTRY.......................................................................................................14
REAL CALIBRATION (WITH SAMPLE WEIGHTS) ................................................................ 15
CONFIRMATION AND CHANGE OF ACTIVE CHANNELS ................................................... 16
EQUALIZATION ....................................................................................................................... 17
FILTER ON THE WEIGHT ....................................................................................................... 18
ANTI PEAK.........................................................................................................................................19
ZERO PARAMETERS.............................................................................................................. 19
RESETTABLE WEIGHT SETTING FOR SMALL WEIGHT CHANGES ...........................................19
AUTOMATIC ZERO SETTING AT POWER-ON ...............................................................................19
ZERO TRACKING ..............................................................................................................................19
SETTING UNITS OF MEASURE.............................................................................................. 20
DISPLAY COEFFICIENT ...................................................................................................................20
OUTPUTS AND INPUTS CONFIGURATION .......................................................................... 22
SEMI-AUTOMATIC TARE (NET/GROSS) ............................................................................... 23
PRESET TARE (SUBTRACTIVE TARE DEVICE)................................................................... 24
SEMI-AUTOMATIC ZERO (WEIGHT ZERO-SETTING FOR SMALL VARIATIONS) ............ 24
PEAK ........................................................................................................................................ 25
ANALOG OUTPUT................................................................................................................... 25
SERIAL COMMUNICATION SETTING.................................................................................... 26
RS485 SERIAL COMMUNICATION ..................................................................................................28
DIRECT CONNECTION BETWEEN RS485 AND RS232 WITHOUT CONVERTER .......................28
AUTOMATIC DIAGNOSTICS OF LOAD DISTRIBUTION....................................................... 29

TEST......................................................................................................................................... 30
EVENTS LOG........................................................................................................................... 30
INFO MENU.............................................................................................................................. 31
SETPOINT PROGRAMMING................................................................................................. 31
USE WITH W SERIES INSTRUMENTS................................................................................. 32
CONNECTION TO THE WEIGHT INDICATOR ....................................................................... 32
ADDITIONAL MENU MAP ....................................................................................................... 33
TLM8 REMOTE CONTROL ..................................................................................................... 34
REMOTE KEYPAD LOCKING ...........................................................................................................34
ADDITIONAL ALARMS ........................................................................................................... 34
ALARMS................................................................................................................................. 35
PRINTING EXAMPLES .......................................................................................................... 37
RESERVED FOR THE INSTALLER ...................................................................................... 39
MENU LOCKING...................................................................................................................... 39
MENU UNLOCKING................................................................................................................. 39
TEMPORARY MENU UNLOCKING......................................................................................... 39
DATA DELETION AND PROGRAM SELECTION................................................................... 39
KEYPAD OR DISPLAY LOCKING .......................................................................................... 40
DECLARATION OF CONFORMITY - EU............................................................................... 41
DECLARATION OF CONFORMITY - UKCA ......................................................................... 42

- 1 -
USER WARNINGS
RECOMMENDATIONS FOR THE PROPER USE OF WEIGHING INSTRUMENT
-Keep away from heat sources and direct sunlight
-Repair the instrument from rain (except special IP versions)
-Do not wash with water jets (except special IP versions)
-Do not dip in water
-Do not spill liquid on the instrument
-Do not use solvents to clean the instrument
-Do not install in areas subject to explosion hazard (except special Atex versions)
-If the working temperature reaches the permitted limits, it is advisable to distance the instruments
to ensure adequate air flow and avoid malfunctions (e.g.: sudden shutdowns or disconnections)
RECOMMENDATIONS FOR CORRECT INSTALLATION OF WEIGHING INSTRUMENTS
The terminals indicated on the instrument’s wiring diagram to be connected to earth must
have the same potential as the weighed structure (same earthing pit or earthing system). If
you are unable to ensure this condition, connect with an earthing wire the terminals of the
instrument (including the terminal –SUPPLY) to the weighed structure.
The cell cable must be individually led to its panel input and not share a conduit with other cables;
connect it directly to the instrument terminal strip without breaking its route with support terminal strips.
Use “RC” filters on the instrument-driven solenoid valve and remote control switch coils.
Avoid inverters in the instrument panel; if inevitable, use special filters for the inverters and separate
them with sheet metal partitions.
The panel installer must provide electric protections for the instruments (fuses, door lock switch etc.).
It is advisable to leave the equipment always switched on to prevent the formation of condensation.
MAXIMUM CABLE LENGTHS
-RS485: 1000 metres with AWG24, shielded and twisted cables
-Analog current output: up to 500 metres with 0.5 mm2 cable
-Analog voltage output: up to 300 metres with 0.5 mm2cable

- 2 -
RECOMMENDATIONS FOR CORRECT INSTALLATION OF THE LOAD CELLS
SIZING OF LOAD CELLS CAPACITY
For safety reasons, in case of static weighing, it is advisable to use the load cells at a maximum of
70-80% of its nominal capacity (assuming that the load is uniformly distributed over the entire
weighed structure); depending on the handling mode of the load to weigh, consider to further reduce
the % of load with respect to the nominal capacity (ex.: forklifts handling, bridge cranes, etc.).
In case of weighing with dynamic loads, the installer has to estimate the thrust speed, the
acceleration, the frequency, etc.
INSTALLING LOAD CELLS
The load cells must be placed on rigid, stable in-line structures; it is important to use the mounting
modules for load cells to compensate for misalignment of the support surfaces.
PROTECTION OF THE CELL CABLE
Use water-proof sheaths and joints in order to protect the cables of the cells.
MECHANICAL RESTRAINTS (pipes, etc.)
When pipes are present, we recommend the use of hoses and flexible couplings with open
mouthpieces with rubber protection; in case of hard pipes, place the pipe support or anchor bracket as
far as possible from the weighed structure (at a distance at least 40 times the diameter of the pipe).
WELDING
Avoid welding with the load cells already installed. If this cannot be avoided, place the welder ground
clamp close to the required welding point to prevent sending current through the load cell body.
WINDY CONDITIONS - KNOCKS –VIBRATIONS
The use of weigh modules is strongly recommended for all load cells to compensate for
misalignment of the support surfaces. The system designer must ensure that the plant is protected
against lateral shifting and tipping relating to: shocks and vibration; windy conditions; seismic
conditions in the installation setting; stability of the support structure.

- 3 -
EARTHING THE WEIGHED STRUCTURE
By means of a copper wire with suitable cross-section, connect the cell upper support plate with the
lower support plate, then connect all the lower plates to a single earthing system. Electrostatic
charges accumulated because of the product rubbing against the pipes and the weighed container
walls are discharged to the ground without going through or damaging the load cells. Failure to
implement a proper earthing system might not affect the operation of the weighing system; this,
however, does not rule out the possibility that the cells and connected instrument may become
damaged in the future. It is forbidden to ensure earthing system continuity by using metal parts
contained in the weighed structure.
FAILURE TO FOLLOW THE INSTALLATION RECOMMENDATIONS WILL BE CONSIDERED
A MISUSE OF THE EQUIPMENT

- 4 -
LOAD CELL INPUT TEST (QUICK ACCESS)
From the weight display, press for 3 seconds: the top of the
display shows the gross weight; the bottom shows the response
signal of each load cell expressed in mV with three decimals.
Example: a load cell with 2.000 mV/V sensitivity provides a
response signal between 0 and 10 mV.
LOAD CELL TESTING
Load cell resistance measurement (use a digital multimeter):
-Turn off the instrument.
-The value between the positive signal wire and the negative signal wire must be equal or similar
to the one indicated in the load cell data sheet (output resistance).
-The value between the positive excitation wire and the negative excitation wire must be equal or
similar to the one indicated in the load cell data sheet (input resistance).
Load cell voltage measurement (use a digital multimeter):
-Turn on the instrument.
-Take out the load cell to be tested from underneath the container, or alternatively, lift the
container support.
-Make sure that the excitation of two wires of the load cell connected to the instrument (or
amplifier) is 5 VDC ±3%.
-Measure the response signal between the positive and the negative signal wires by directly
connecting them to the tester, and make sure that it is comprised between 0 and ±0.5 mV.
-Apply load to the cell and make sure that there is a signal increment.
IF ONE OF THE ABOVE CONDITIONS IS NOT MET, PLEASE CONTACT THE TECHNICAL
ASSISTANCE SERVICE.


3 s

- 5 -
MAIN SPECIFICATIONS OF THE INSTRUMENT
Weight transmitter with 6-wire load cells inputs suitable for assembly on back panel fitted
Omega/DIN rail. Dimensions: 148x92x60 mm. Backlit LCD graphic display, 128x64 pixel resolution,
60x32 mm viewing area. 5-key keypad.
16 bit analog output (tension or current).
RS485 serial port for connection to: PC/PLC up to 32 instruments (max 99 with line repeaters) by
ASCII Laumas or ModBus R.T.U. protocol, remote display, printer. Optional: integrated Profibus DP,
DeviceNet, CANopen, Profinet IO, Ethernet/IP, Ethernet TCP/IP, Modbus TCP, RS232/RS485,
SERCOS III, PowerLink, CC-Link output.
8 independent channels:automatic detection of connected load cells.
Digital equalization: load cell response uniformed via software.
Load distribution: graph showing the weight percentage on each load cell.
Automatic diagnostics: load distribution check to detect any faults.
Events log: storage of the last 50 events: calibrations, zero-settings, errors, equalizations.
Alarm Relay: outputs can be set to switch in case of alarm.

- 6 -
TECHNICAL SPECIFICATIONS
POWER SUPPLY and CONSUMPTION (VDC)
12/24 VDC ±10%; 5 W
NO. OF LOAD CELLS IN PARALLEL and SUPPLY
max 16 (350 ohm); 5 VDC / 240 mA
LINEARITY
< 0.01% F.S.
ANALOG OUTPUT LINEARITY
< 0.01% F.S.
THERMAL DRIFT
< 0.0005% F.S./°C
ANALOG OUTPUT THERMAL DRIFT
< 0.003 % F.S./°C
A/D CONVERTER
8 channels, 24 bit (16000000 points), 4.8 kHz
DIVISIONS
(with measurement range ±10 mV = sens. 2 mV/V)
±999999
MEASUREMENT RANGE
±39 mV
MAX SENSITIVITY OF USABLE LOAD CELLS
±7 mV/V
MAX CONVERSIONS PER SECOND
600 conversions/second
DISPLAY RANGE
±999999
NO. OF DECIMALS / DISPLAY INCREMENTS
0÷4 / x 1 x 2 x 5 x 10 x 20 x 50 x 100
DIGITAL FILTER / READINGS PER SECOND
21 levels / 5÷600 Hz
RELAY OUTPUTS
N. 5 - max 115 VAC; 150 mA
DIGITAL INPUTS
N. 3 - optoisolated 5 - 24 VDC PNP
SERIAL PORTS
RS485
BAUD RATE
2400, 4800, 9600, 19200, 38400, 115200
HUMIDITY (non condensing)
85%
STORAGE TEMPERATURE
-30°C +80°C
WORKING TEMPERATURE
-20°C +60°C
ANALOG OUTPUT
16 bit - 65535 divisions
0÷20 mA; 4÷20 mA (max 400 ohm);
0÷10 V; 0÷5 V (min 2 kohm)
RELAY OUTPUTS
N. 5 - max 30 VAC, 60 VDC; 150 mA
Equipment to be powered by 12-24 VDC LPS or Class 2 power source.

- 7 -
ELECTRICAL CONNECTIONS
BASIC INFORMATION
-It is recommended that the power supply negative pole be grounded.
-It is possible to supply up to 16 350 ohm load cells.
-Connect terminal “–SUPPLY” to the RS485 common of the connected instruments in the event
that these receive alternating current input or that they have an optically isolated RS485.
-In case of an RS485 network with several devices it is recommended to activate the 120 ohm
termination resistance on the two devices located at the ends of the network, as described in the
paragraph RS485 SERIAL CONNECTION.
WIRING DIAGRAM
In case of difficulty connecting all the reference wires of the installed load cells, simply connect
those of the load cell located at the average distance from the instrument. The reference wires not
used must be individually isolated.
USE OF 4-WIRE LOAD CELLS: if all the load cells used are 4-wire, make a jumper between EX-
(10) and REF- (7) and between EX+ (17) and REF+ (20).
LOAD CELL 5 LOAD CELL 6 LOAD CELL 7 LOAD CELL 8
+EX
-EX -SIG
+SIG
SH
-REF
+REF
LOAD CELL 1 LOAD CELL 2 LOAD CELL 3 LOAD CELL 4
+EX
-EX
-SIG
+SIG
SH
-REF
+REF
1 2 345678 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
+EX
-EX
-SIG
+SIG
SH
-REF
+REF
+EX
-EX
-SIG
+SIG
SH
-REF
+REF
+EX
-EX
-SIG
+SIG
SH
-REF
+REF
+EX
-EX -SIG
+SIG
SH
-REF
+REF +EX
-EX -SIG
+SIG
SH
-REF
+REF +EX
-EX -SIG
+SIG
SH
-REF
+REF

- 8 -
TERMINALS LEGEND
1
-LOAD CELL 1 SIGNAL
22
+LOAD CELL 7 SIGNAL
2
+LOAD CELL 1 SIGNAL
23
-LOAD CELLS 7 and 8 EXCITATION (-EX)
LOAD CELLS SHIELD
3
-LOAD CELLS 1 and 2 EXCITATION (-EX)
LOAD CELLS SHIELD
24
+LOAD CELLS 7 and 8 EXCITATION (+EX)
4
+LOAD CELLS 1 and 2 EXCITATION (+EX)
25
-LOAD CELL 8 SIGNAL
5
-LOAD CELL 2 SIGNAL
26
+LOAD CELL 8 SIGNAL
6
+LOAD CELL 2 SIGNAL
27
OUTPUT No. 1
7
-LOAD CELLS REF/SENSE
28
OUTPUT No. 2
8
-LOAD CELL 3 SIGNAL
29
OUTPUT No. 3
9
+LOAD CELL 3 SIGNAL
30
OUTPUT No. 4
10
-LOAD CELLS 3 and 4 EXCITATION (-EX)
LOAD CELLS SHIELD
31
OUTPUT No. 5
11
+LOAD CELLS 3 and 4 EXCITATION (+EX)
32
OUTPUT COMMON
12
-LOAD CELL 4 SIGNAL
33
INPUT No. 1 (+VDC min 5 V max 24 V)
13
+LOAD CELL 4 SIGNAL
34
INPUT No. 2 (+VDC min 5 V max 24 V)
14
-LOAD CELL 5 SIGNAL
35
INPUT No. 3 (+VDC min 5 V max 24 V)
15
+LOAD CELL 5 SIGNAL
36
INPUT COMMON (-VDC 0 V)
16
-LOAD CELLS 5 and 6 EXCITATION (-EX)
LOAD CELLS SHIELD
37
+ANALOG OUTPUT 0÷20 or 4÷20 mA
17
+LOAD CELLS 5 and 6 EXCITATION (+EX)
38
+ANALOG OUTPUT 0÷10 V
18
-LOAD CELL 6 SIGNAL
39
RS485: +
19
+LOAD CELL 6 SIGNAL
40
RS485: -
20
+LOAD CELLS REF/SENSE
41
+SUPPLY (12/24 VDC)
21
-LOAD CELL 7 SIGNAL
42
-SUPPLY (12/24 VDC)
RS485: SHIELD, GND, -ANALOG OUTPUT
COMMON
OUT 1
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
OUT 2
OUT 3
OUT 4
OUT 5
OUT COMMON
IN 1
IN 2
IN 3
IN COMMON
+ 0÷20 - 4÷20 mA
+ 0÷10 VDC
+
-
+SUPPLY
-SUPPLY
RS485 12/24 VDC
SUPPLY
-COMMON
ANALOG
OUTPUT
+
-
INPUTS
supply 5÷24 VDC
OUTPUTS
max 115 VAC 150 mA

- 9 -
KEYS AND SYMBOLS FUNCTIONS
KEY
Short press
Long press
(3 s)
Into menus
Semi-automatic zero
Tare resetting
Cancel or return to previous
menu
Gross Net
Net Gross
Select figure to be modified
or go to previous menu item.
Weight print
Gross weight:
mV load cell test
Net weight:
temporarily
display the
gross weight
Modify selected figure or go
to next menu item
Setting setpoint and hysteresis
Confirm or enter in
submenu
+
Setting general parameters (press
immediately followed by )
+
Setting preset tare (press
immediately followed by )
Load distribution display
SYMBOL
Function
net weight (semi-automatic tare or preset tare)
zero (deviation from zero not more than ±0.25 divisions)
stability
unit of measure: kg
unit of measure: g
not used
The symbols are activated in sequence within the menus to indicate that the display is
not showing a weight.

- 10 -
MENU MAP
Into menus changes are applied right after pressing the ENTER key (no further confirmation is required).
SETPOINT
SYSTEM PARAMETERS

 
 
…


…










+


 

 
 
 
 
 

 





 



 


3 s


 






 

 

 
 
 
 
 
 
 





- 11 -


+


3 s











 

 

 
 
 




- 12 -
INSTRUMENT COMMISSIONING
Upon switch-on, the display shows in sequence:
- → (ONLY in case of approved program);
-instrument model (e.g.: );
- followed by the software code (e.g.:  );
-program type:  (base);
-followed by the software version (e.g.:  );
- followed by the hardware code (e.g.:  );
-serial number (e.g.: );
Check that the display shows the weight and that when loading the load cells there is an increase in
weight. If there is not check and verify the connections and correct positioning of the load cells.
-If the instrument has already been theoretical CALIBRATED (plant system identification tag
present on the instrument and on the cover: load cell’s rated data already entered):
▫If the system uses load cells with different sensitivity perform a real or theoretical equalization
(see section EQUALIZATION).
▫Reset to zero (see section TARE WEIGHT ZERO SETTING).
▫Check the calibration with sample weights and correct the indicated weight if necessary (see
section REAL CALIBRATION (WITH SAMPLE WEIGHTS)).
-If the instrument HAS NOT BEEN CALIBRATED (missing plant system identification tag)
proceed with calibration:
▫If the system uses load cells with different sensitivity perform a real or theoretical equalization
(see section EQUALIZATION).
▫If load cells data are unknown, follow the procedure in section REAL CALIBRATION (WITH
SAMPLE WEIGHTS).
▫Enter the rated data of load cells following the procedure given in section THEORETICAL
CALIBRATION.
▫Reset to zero (see section TARE WEIGHT ZERO SETTING).
▫Check the calibration with sample weights and correct the indicated weight if necessary (see
section REAL CALIBRATION (WITH SAMPLE WEIGHTS)).
-If you use the analog output, set the desired analog output type and the full scale value (see
section ANALOG OUTPUT).
-If you use serial communication, set the related parameters (see section SERIAL
COMMUNICATION SETTING).
-If setpoint are used, set the required weight values and the relevant parameters (see sections
SETPOINT PROGRAMMING and OUTPUTS AND INPUTS CONFIGURATION).

- 13 -
PROGRAMMING OF SYSTEM PARAMETERS
From the weight display, press simultaneously keys MENU and ESC to access the parameter setting.
MENU/ENTER: to enter a menu/confirm the data entry.
: to modify the displayed figure or menu item.
: to select a new figure or modify the displayed menu item.
ESC: to cancel and return to the previous menu.
THEORETICAL CALIBRATION
This function allows the load cell rated values to be set.
To perform the theoretical calibration set the following parameters in sequence:
- (default: ): the system full scale is given by one cell capacity multiplied by the
number of cells used. Example: 4 cells of 1000 kg FULL SCALE = 1000 x 4 = 4000.
The instrument is supplied with a theoretical full scale value  corresponding to 10000. To
restore factory values, set 0 as full scale.
- (default: 2.00000 mV/V): sensitivity is a load cell rated parameter expressed in mV/V.
Set the average sensitivity value indicated on the load cells. It’s possible to set a value between
0.50000 and 7.00000 mV/V. Example of 4-cell system with sensitivity: 2.00100, 2.00150,
2.00200, 2.00250; enter 2.00175, calculated as (2.00100 + 2.00150 + 2.00200 + 2.00250) / 4.
-:the division (resolution) is the minimum weight increment value which can be
displayed. It is automatically calculated by the system according to the performed calibration, so
that it is equal to 1/10000 of full scale. It can be changed and be variable between 0.0001 and
100 with x1 x2 x5 x10 increments.
-By modifying the theoretical full scale or the sensitivity, the real calibration is cancelled
and the theoretical calibration only is considered valid.
-If the theoretical full scale and the recalculated full scale in real calibration (see section
REAL CALIBRATION (WITH SAMPLE WEIGHTS)) are equal, this means that the
calibration currently in use is theoretical; if they are different, the calibration in use is the
real calibration based on sample weights.
-By modifying the theoretical full scale or the sensitivity, the system’s parameters
containing a weight value will be set to default values (setpoint, hysteresis, etc.).

+





- 14 -
MAXIMUM CAPACITY
: maximum displayable weight (from 0 to full scale; default: 0). When the weight exceeds this
value by 9 divisions, the display shows . To disable this function, set 0.
TARE WEIGHT ZERO SETTING
This menu may also be accessed directly from the weight display, holding down the
key for 3 seconds.
Perform this procedure after having set the THEORETICAL CALIBRATION data.
Use this function to set to zero the weight of the empty system after commissioning and then later
on to compensate zero variations due to the presence of product residues.
Procedure:
-Confirm the message  by pressing ENTER.
-The weight value to be set to zero is displayed. In this phase all of the symbols are flashing.
-Confirming once again, the weight is set to zero (the value is stored to the permanent memory).
-Press to display the value of the total weight reset by the instrument, given by the sum of all
of the previous zero settings.
DIAGNOSTICS ON ZERO: if diagnostics on zero has been enabled, the display shows the current
load distribution and the weight value; by pressing and , the stored load distribution and the
weight set to zero are displayed (if the weight is zero and all channels are , it means that no
zero-setting has yet been performed). Press ENTER and select  or   to store or not
the current distribution and the zero mV values (see section TEST). Confirm by pressing ENTER to
perform a new zero-setting.
WARNING: diagnostics on zero is performed only if the load distribution has been stored
at least once.
ZERO VALUE MANUAL ENTRY
WARNING: Perform this procedure only if it’s not possible to reset the weighed structure tare, for
example because it contains product that cannot be unloaded.
Set in this parameter the estimated zero value (from -99999 to +999999; default: 0).
0

+




+




+


 

- 15 -
REAL CALIBRATION (WITH SAMPLE WEIGHTS)
After having performed the THEORETICAL CALIBRATION, EQUALIZATION and TARE WEIGHT
ZERO SETTING, this function allows correct calibration to be done using sample weights of
known value and, if necessary, any deviations of the indicated value from the correct value to
be corrected.
Load onto the weighing system a sample weight, which must be at least 50% of the maximum
quantity to be weighed.
By confirming the message  the flashing value of the weight currently on the system is
displayed. In this phase all of the symbols are off. Adjust the value on display by using the arrow
keys if necessary. After confirming, the new set weight will appear with all the symbols flashing.
After an additional confirmation, the message  will be restored and by repeatedly pressing
the key ESC the weight will once again be displayed.
Example: for a system of maximum capacity 1000 kg and 1 kg division, two sample weights are
available, one of 500 kg and the other one of 300 kg. Load both weights onto the system and correct
the indicated weight to 800. Now remove the 300 kg weight, the system must show 500; remove the
500 kg weight too; the system must read zero. If this does not happen, it means that there is a
mechanical problem affecting the system linearity.
WARNING: identify and correct any mechanical problems before repeating the procedure.
-If theoretical full scale and recalculated full scale in real calibration are equal, it means
that the theoretical calibration is currently in use; otherwise, the real calibration based on
sample weights is in use.
-If the correction made changes the previous full scale for more than 20%, all the
parameters with settable weight values are reset to default values.
LINEARISATION OPTION ON MAX 8 POINTS:
It is possible to perform a linearisation of the weight repeating the above-described procedure
up to a maximum of eight points, using eight different sample weights. The procedure ends by
pressing the ESC button or after entering the eighth value; at this point it will no longer be
possible to change the calibration value, but only to perform a new real calibration. To perform a new
calibration, should return to the weight display and then re-entering into the calibration menu.
By pressing after having confirmed the sample weight that has been set, the full scale appears,
recalculated according to the value of the maximum sample weight entered and making reference to
the cell sensitivity set in the theoretical calibration ().

+




- 16 -
CONFIRMATION AND CHANGE OF ACTIVE CHANNELS
After performing the calibration and verifying that the system works properly, you can confirm the
channels automatically detected by the instrument; in this way, in case of accidental interruption of
the cable of one or more load cells, the instrument displays the  alarm.
 (default): confirmation is requested (),press ENTER to proceed or press ESC to
cancel. The display shows the number of channels automatically detected by the instrument, press
ENTER to confirm and save the current selection or press ESC to exit with no change.
 confirmation is requested (),press ENTER to proceed or press ESC to cancel.
Press or to select the channel, confirm with ENTER and press or to activate ()or
deactivate it (); press ESC to save the current selection and exit.
After editing, you must repeat equalization, zero setting and calibration using a sample
weight.

+


 