LAUMAS WLIGHT User manual

Installation and User Manual
version 1.00
WLIGHT
2014/30/EU
EN55022:2010 EN61000-6-2:2005 EN61000-6-4:2007
SYSTEM IDENTIFICATION
Load Cell Systems reserves the right to change specifications without notice. ©2019
Web: https://loadcellsys.com
Email: [e-mail]
Phone: [phone]

KEY TO SYMBOLS
Below are the symbols used in the manual to draw the reader's attention:
Warning! Risk of electrocution.
Warning! This operation must be performed by skilled workers.
Read the following indications carefully.
Further information.
GUARANTEE
24 months from the delivery document date. The guarantee covers only defected parts and includes the replacement
parts and labour. All shipping and packing costs are paid by the customer. It is possible to have the repair in
guarantee on condition that the returned product has not been transformed, damaged or repaired without
authorization. No guarantee is applicable on returned products without the original label and/or serial number. No
guarantee against misuse.
Batteries: Laumas provides 1 year guarantee from the date of delivery note, against material defects or battery
manufacturing faults.
DISPOSAL
This symbol on the product or on the packaging indicates that:
-This is an electrical/electronic device that should be disposed of separately from the municipal solid waste via
designated collection facilities
-Improper use or disposal can be harmful to human health and the environment
-Non-compliance with these guidelines will be sanctioned according to the laws in force in the destination country
-It is recommended to dispose of packaging in accordance with local regulations

TABLE OF CONTENTS
USER WARNINGS................................................................................................................. 1
RECOMMENDATIONS FOR CORRECT INSTALLATION OF WEIGHING INSTRUMENTS. 1
RECOMMENDATIONS FOR CORRECT INSTALLATION OF THE LOAD CELLS ............... 1
LOAD CELL INPUT TEST (QUICK ACCESS) .........................................................................4
LOAD CELL TESTING.............................................................................................................4
MAIN SPECIFICATIONS OF THE INSTRUMENT.................................................................. 5
BUFFER BATTERY..................................................................................................................5
TECHNICAL SPECIFICATIONS ............................................................................................ 6
ELECTRICAL CONNECTIONS.............................................................................................. 7
BASIC INFORMATION............................................................................................................. 7
KEY CONNECTORS ........................................................................................................................ 7
KEYS AND LED FUNCTIONS ............................................................................................... 8
MENU MAP .......................................................................................................................... 10
SYSTEM PARAMETERS ....................................................................................................... 10
INSTRUMENT COMMISSIONING........................................................................................ 11
PROGRAMMING OF SYSTEM PARAMETERS .................................................................. 12
THEORETICAL CALIBRATION ............................................................................................. 12
MAXIMUM CAPACITY ................................................................................................................... 13
TARE WEIGHT ZERO SETTING.................................................................................................... 13
ZERO VALUE MANUAL ENTRY.................................................................................................... 13
REAL CALIBRATION (WITH SAMPLE WEIGHTS)............................................................... 14
FILTER ON THE WEIGHT...................................................................................................... 15
ANTI PEAK..................................................................................................................................... 15
ZERO PARAMETERS............................................................................................................ 16
RESETTABLE WEIGHT SETTING FOR SMALL WEIGHT CHANGES ......................................... 16
AUTOMATIC ZERO SETTING AT POWER-ON............................................................................. 16
ZERO TRACKING .......................................................................................................................... 16
SETTING UNITS OF MEASURE ............................................................................................ 17
NET FUNCTIONS................................................................................................................... 17
SEMI-AUTOMATIC TARE (NET/GROSS).............................................................................. 18
PRESET TARE (SUBTRACTIVE TARE DEVICE) ................................................................. 18
SEMI-AUTOMATIC ZERO (WEIGHT ZERO-SETTING FOR SMALL VARIATIONS) ............ 19
PEAK...................................................................................................................................... 19
SERIAL COMMUNICATION SETTING .................................................................................. 20
RS232 SERIAL COMMUNICATION ............................................................................................... 21
DIRECT CONNECTION BETWEEN RS485 AND RS232 WITHOUT CONVERTER...................... 21
TEST....................................................................................................................................... 22
BATTERY OPERATION......................................................................................................... 22
ENERGY SAVING .................................................................................................................. 23
DATE AND TIME SETTING.................................................................................................... 23
INFO MENU............................................................................................................................ 23

PIECE COUNTER ................................................................................................................ 24
INCREASING OPERATION ................................................................................................... 24
DECREASING OPERATION.................................................................................................. 24
DISPLAY AND OPERATION.................................................................................................. 24
TOTALIZER ......................................................................................................................... 25
SELECT TOTALIZER OPERATING MODE ........................................................................... 25
DISPLAY AND OPERATION.................................................................................................. 26
ALARMS .............................................................................................................................. 27
PRINTING EXAMPLES........................................................................................................ 28
CONTINUOUS FAST WEIGHT TRANSMISSION PROTOCOL ........................................... 29
CONTINUOUS WEIGHT TRANSMISSION TO REMOTE DISPLAYS PROTOCOL............. 30
ASCII BIDIRECTIONAL PROTOCOL .................................................................................. 31
1. READING WEIGHT OR PEAK (IF PRESENT) FROM PC............................................. 31
2. SEMI-AUTOMATIC ZERO (WEIGHT ZERO-SETTING FOR SMALL VARIATIONS).... 32
3. SWITCHING FROM GROSS TO NET WEIGHT ............................................................ 32
4. SWITCHING FROM NET TO GROSS WEIGHT ............................................................ 32
5. SWITCHING FROM NET TO GROSS WEIGHT ............................................................ 33
6. TARE ZERO SETTING .................................................................................................. 33
7. REAL CALIBRATION (WITH SAMPLE WEIGHT)......................................................... 34
8. CHECK-SUM CALCULATION....................................................................................... 35
MODBUS-RTU PROTOCOL ................................................................................................ 36
FUNCTIONS SUPPORTED IN MODBUS............................................................................... 36
COMMUNICATION ERROR MANAGEMENT ........................................................................ 38
LIST OF AVAILABLE REGISTERS ....................................................................................... 39
POSSIBLE COMMANDS TO BE SENT TO THE COMMAND REGISTER (40006) ............... 42
REAL CALIBRATION COMMANDS (WITH SAMPLE WEIGHTS)................................................. 42
COMMUNICATION EXAMPLES ............................................................................................ 43
RESERVED FOR THE INSTALLER..................................................................................... 45
MENU LOCKING.................................................................................................................... 45
MENU UNLOCKING............................................................................................................... 45
TEMPORARY MENU UNLOCKING ....................................................................................... 45
SETTING UNLOCK PASSWORD .......................................................................................... 45
DATA DELETION AND PROGRAM SELECTION ................................................................. 45
KEYPAD OR DISPLAY LOCKING......................................................................................... 46
DECLARATION OF CONFORMITY - EU............................................................................. 47

- 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)
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
-RS232: 15 m for baud rates up to 19200
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.

- 2 -
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.
CONNECTING SEVERAL CELLS IN PARALLEL
Connect several cells in parallel by using - if necessary - a watertight junction box with terminal box.
The cell connection extension cables must be shielded, led individually into their piping or conduit
and laid as far as possible from the power cables (in case of 4-wire connections, use cables with
4x1 mm2minimum cross-section).
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 response signal of the load cells is displayed,
expressed in mV with four decimals.
LOAD CELL TESTING
Load cell resistance measurement (use a digital multimeter):
-Disconnect the load cells from the instrument and check that there is no moisture in the cell
junction box caused by condensation or water infiltration. If so, drain the system or replace it if
necessary.
-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).
-The insulation value between the shield and any other cell wire and between any other cell wire
and the body of the load cell must be higher than 20 Mohm.
Load cell voltage measurement (use a digital multimeter):
-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
Indicator with 6-wire load cell input installable on table, wall or column. Dimensions:
120x200x280 mm. 6-digit semi-alphanumeric red LED display (20 mm height), 8 signaling LED.
5-key mechanical keyboard. D-SUB connectors. IP40 protection rating.
Real-time clock/calendar with buffer battery.
A RS232 serial port for connection to: PC/PLC up to 32 instruments (max 99 with line repeaters) by
ASCII Laumas or ModBus R.T.U. protocols, remote display, printer.
24 VDC/1 A stabilized power supply included.
Designed to operate with 8 NiMH rechargeable batteries, 1.2 V, AA type (not included).
BUFFER BATTERY
The instrument is equipped with an internal battery that allows to keep active the internal clock even
in the event of power failure.
At the first start and after long periods of inactivity, leave the instrument on for at least 12
hours to fully charge the battery.

- 6 -
TECHNICAL SPECIFICATIONS
POWER SUPPLY and CONSUMPTION
12/24 VDC ±10%; 6 W (standard)
NO. OF LOAD CELLS IN PARALLEL and SUPPLY
max 8 (350 ohm); 5 VDC / 120 mA
LINEARITY
< 0.01% F.S.
THERMAL DRIFT
< 0.0005% F.S./°C
A/D CONVERTER
24 bit (16000000 points)
MAX 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
300 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
10 levels / 5÷300 Hz
SERIAL PORTS
RS232
BAUD RATE
2400, 4800, 9600, 19200, 38400, 115200
HUMIDITY (non condensing)
85%
STORAGE TEMPERATURE
-30°C +80°C
WORKING TEMPERATURE
-20°C +60°C
WORKING TEMPERATURE
-20°C +58°C
Equipment to be powered by 12-24 VDC LPS or Class 2 power source.