Seneca Z-SG3 User manual

ORIGINAL INSTRUCTIONS
USER MANUAL
Z-SG3 / ZE-SG3
SENECA S.r.l.
Via Austria 26 –35127 –Z.I. - PADOVA (PD) - ITALY
Tel. [phone] Fax [phone]
www.seneca.it

User Manual
Z/ZE-SG3 SERIES
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Introduction
The content of this documentation refers to products and technologies described in it.
All technical data contained in the document may be changed without notice.
The content of this documentation is subject to periodic review.
To use the product safely and effectively, read the following instructions carefully before use.
The product must be used only for the use for which it was designed and manufactured: any other use is under
the full responsibility of the user.
Installation, programming and set-up are allowed only to authorized, physically and intellectually suitable
operators.
Set-up must be performed only after correct installation and the user must follow all the operations described in
the installation manual carefully.
Seneca is not responsible for failures, breakages and accidents caused by ignorance or failure to apply the
stated requirements.
Seneca is not responsible for any unauthorized modifications.
Seneca reserves the right to modify the device, for any commercial or construction requirement, without the
obligation to promptly update the reference manuals.
No liability for the contents of this document can be accepted.
Use the concepts, examples and other content at your own risk.
There may be errors and inaccuracies in this document that could damage your system, so proceed with caution,
the author(s) will not take responsibility for it.
Technical specifications are subject to change without notice.
CONTACT US
Technical support
[email protected]
Product information
[email protected]
This document is the property of SENECA srl.
Copies and reproduction are prohibited unless authorised.

User Manual
Z/ZE-SG3 SERIES
ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY
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Document revisions
DATE
REVISION
NOTES
AUTHOR
26/06/2023
0
First revision
MM

User Manual
Z/ZE-SG3 SERIES
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TABLE OF CONTENTS
1. INTRODUZIONE...........................................................................................................6
DESCRIZIONE..........................................................................................................................................................................6
CONNESSIONE ALLA CELLA DI CARICO ............................................................................................................................7
CONNESSIONE ALLA CELLA DI CARICO A 4 O 6 FILI .......................................................................................................7
VERIFICA DEL FUNZIONAMENTO DELLA CELLA DI CARICO ...........................................................................................7
VERIFICA CABLAGGI CON MULTIMETRO DIGITALE ......................................................................................................7
COLLEGAMENTO DI PIU’ CELLE DI CARICO IN PARALLELO ........................................................................................8
TRIMMING DELLE CELLE DI CARICO A 4 FILI .................................................................................................................9
2. DIP SWITCH...............................................................................................................11
DIP SWITCH SW1 ..................................................................................................................................................................11
CONFIGURAZIONE DELLA PORTA RS485 DA DIP SWITCH .........................................................................................11
CONFIGURAZIONE DELLA PORTA RS485 DA MEMORIA FLASH ................................................................................11
CONFIGURAZIONE DEL BAUD RATE DELLA RS485 DA DIP SWITCH.........................................................................12
IMPOSTARE IL MODBUS STATION ADDRESS DELLA PORTA RS485 DA DIP SWITCH SW1....................................13
DIP SWITCH SW2 ..................................................................................................................................................................13
3. PORTA USB...............................................................................................................14
4. CONNESSIONE DEL DISPOSITIVO AD UNA RETE ETHERNET (SOLO MODELLO
ZE-SG3).............................................................................................................................15
5. MODBUS PASSTHROUGH (SOLO MODELLO ZE-SG3) .........................................16
6. WEBSERVER (SOLO MODELLO ZE-SG3)...............................................................17
ACCESSO AL WEBSERVER ................................................................................................................................................17
7. CONFIGURAZIONE DEL DISPOSITIVO ZE-SG3 TRAMITE WEBSERVER.............18
SEZIONE SETUP ...................................................................................................................................................................18
SEZIONE SETUP LOAD CELL..............................................................................................................................................19
SEZIONE SETUP I/O..............................................................................................................................................................22
SEZIONE TEST AND LOAD CELL CALIBRATION ..............................................................................................................25
8. CONFIGURAZIONE DEL DISPOSITIVO Z-SG3 / ZE-SG3 TRAMITE EASY SETUP 2
25
9. TARATURA DELLA CELLA DI CARICO...................................................................31
TARATURA DELLA CELLA DI CARICO TRAMITE IL WEBSERVER (SOLO MODELLO ZE-SG3)...................................31
TARTURA CELLA CON PARAMETRI DI FABBRICA .......................................................................................................31
9.1.1.1. INSERIMENTO MANUALE DELLA TARA ....................................................................................................................31
9.1.1.2. ACQUISIZIONE DELLA TARA DAL CAMPO................................................................................................................32
TARATURA CELLA CON UN PESO CAMPIONE .............................................................................................................32

User Manual
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TARATURA DELLA CELLA DI CARICO TRAMITE IL SOFTWARE EASY SETUP 2 (SOLO MODELLO Z-SG3).............34
TARATURA CELLA CON PARAMETRI DI FABBRICA .....................................................................................................34
TARATURA CELLA CON PARAMETRI DI FABBRICA E CON TARA INSERITA MANUALMENTE ................................34
TARTURA CELLA CON UN PESO CAMPIONE................................................................................................................34
TARATURA DELLA CELLA DI CARICO TRAMITE REGISTRI MODBUS...........................................................................34
TARATURA CELLA CON PARAMETRI DI FABBRICA .....................................................................................................34
TARATURA CELLA CON PARAMETRI DI FABBRICA E CON TARA INSERITA MANUALMENTE ................................35
TARTURA CELLA CON UN PESO CAMPIONE................................................................................................................35
10. REGISTRI MODBUS RTU/ MODBUS TCP-IP............................................................36
NUMERAZIONE DEGLI INDIRIZZI MODBUS “0 BASED” O “1 BASED” ...........................................................................37
NUMERAZIONE DEGLI INDIRIZZI MODBUS CON CONVENZIONE “0 BASED”...............................................................37
NUMERAZIONE DEGLI INDIRIZZI MODBUS CON CONVENZIONE “1 BASED” (STANDARD) .......................................37
CONVENZIONE DEI BIT ALL’INTERNO DI UN REGISTRO MODBUS HOLDING REGISTER ..........................................38
CONVENZIONE DEI BYTE MSB e LSB ALL’INTERNO DI UN REGISTRO MODBUS HOLDING REGISTER ..................38
RAPPRESENTAZIONE DI UN VALORE A 32 BIT IN DUE REGISTRI MODBUS HOLDING REGISTER CONSECUTIVI .39
TIPI DI DATO FLOATING POINT A 32 BIT (IEEE 754) ........................................................................................................40
PROTOCOLLI MODBUS DI COMUNICAZIONE SUPPORTATI ...........................................................................................41
CODICI FUNZIONE MODBUS SUPPORTATI .......................................................................................................................41
11. TAVOLA DEI REGISTRI MODBUS PER IL DISPOSITIVO Z-SG3 / ZE-SG3............42
Z/ZE-SG3: TAVOLA DEI REGISTRI MODBUS 4x HOLDING REGISTERS (FUNCTION CODE 3) ....................................42
12. PULSANTE PS1.........................................................................................................42
13. AGGIORNAMENTO DEL FIRMWARE.......................................................................42
ZE-SG3 ...................................................................................................................................................................................42
Z-SG3......................................................................................................................................................................................42
14. RICERCA E MODIFICA DELL'IP DEL DISPOSITIVO CON IL TOOL SENECA
DISCOVERY DEVICE (SOLO MODELLO ZE-SG3).........................................................43

User Manual
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1. INTRODUCTION
ATTENTION!
This user manual extends the information from the installation manual to the configuration of the
device. Use the installation manual for more information.
ATTENTION!
In any case, SENECA s.r.l. or its suppliers will not be responsible for the loss of data/revenue or
consequential or incidental damages due to negligence or bad/improper management of the device,
even if SENECA is well aware of these possible damages.
SENECA, its subsidiaries, affiliates, group companies, suppliers and distributors do not guarantee that
the functions fully meet the customer's expectations or that the device, firmware and software should
have no errors or operate continuously.
DESCRIPTION
Z-SG3 and ZE-SG3 are load cell converters (strain gauge).
The measurement, carried out with the 4 or 6-wire technique, is available via the TCP-IP Modbus server (ZE-
SG3 model only) or via RTU slave Modbus protocols.
The devices are equipped with a new noise filter specifically developed to obtain a rapid response time. The
device is fully configurable also via the webserver (ZE-SG3 model only).
.
MODEL
ETHERNET PORT
USB PORT
Z-SG3
NO
YES
ZE-SG3
1 PORT 10/100 Mbit
NO

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LOAD CELL CONNECTION
It is possible to connect the converter to the load cell in 4- or 6-wire mode. 6-wire measurement is preferable for
measurement accuracy.
The load cell power supply is provided directly by the device.
4- OR 6-WIRE LOAD CELL CONNECTION
A load cell can have a four-wire or six-wire cable. In addition to having the +/- excitation and +/- signal lines a
six-wire cable also has the +/- sense lines. It is a common misconception to think that the only difference between
4- or 6-wire load cells is the possibility of the latter to measure the actual voltage at the load cell. A load cell is
compensated to work within specifications in a certain temperature range (usually -10 - +40°C). Since the cable
resistance depends on the temperature, the response of the cable to temperature changes must be eliminated.
The 4-wire cable is part of the load cell temperature compensation system. The 4-wire load cell is calibrated and
compensated with a certain amount of cable connected. For this reason, never cut the cable of a 4-wire load
cell. The cable of a 6-wire cell, on the other hand, is not part of the load cell temperature compensation system.
The sense lines are connected to the R-SG3 sense terminals, to measure and adjust the actual voltage of the
load cell. The advantage of using this "active" system is the possibility of cutting (or extending) the 6-wire load
cell cable to any length. It must be considered that a 6-wire load cell will not reach the performance declared in
the specifications if the sense lines are not used.
CHECKING THE LOAD CELL OPERATION
Before starting the configuration of the device it is necessary to verify the correctness of the wiring and the
integrity of the load cell.
CHECKING CABLES WITH A DIGITAL MULTIMETER
First you need to check with the load cell manual that there are about 5V DC between the +Excitation and –
Excitation cables. If the cell has 6 wires check that the same voltage is also measured between +Sense and –
Sense.
Now leave the cell at rest (without the tare) and check that the voltage between the +Signal and –Signal cables
is around 0 V.
Now unbalance the cell by applying a compression force, checking that the voltage between the +Signal and –
Signal cables increases until it reaches the full scale (if possible) where the measurement will be approximately:
5* (cell sensitivity) mV.
For example, if the declared cell sensitivity is 2 mV/V, 5 * 2 = 10 mV must be obtained.

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In the case of bipolar measurement only (compression/traction) it is necessary to completely unbalance the cell
even in traction, in this case the same value must be measured between the +Signal and –Signal cables but
with the negative sign:
-5* (cell sensitivity) mV.
CONNECTION OF MORE LOAD CELLS IN PARALLEL
It is possible to connect up to a maximum of 8 load cells (and in any case without ever falling below the minimum
87 Ohms).
It is therefore possible to connect:
NUMBER OF LOAD CELLS IN PARALLEL
IMPEDANCE OF THE
STATED LOAD CELL
[Ohm]
MAXIMUM NUMBER OF CONNECTABLE CELLS IN PARALLEL
350
4
1000
8
For the connection of 4 load cells Seneca recommends using the SG-EQ4 product.
To connect 2 or more 4-wire cells in parallel with the SG-EQ4 junction box, use the following diagram:

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To connect 2 or more 6-wire cells in parallel with the SG-EQ4 junction box use the following diagram:
For more details, refer to the SG-EQ4 Junction Box accessory manual.
TRIMMING 4-WIRE LOAD CELLS
The figure below shows a diagram of three trimmed load cells.
A variable resistor, independent of the temperature, or a typically 20 Ω potentiometer is inserted in the
+Excitation cable of each load cell. There are two ways to trim the load cells. The first method is to adjust the
potentiometers by trial, shifting the calibration weights from one corner to another. All the potentiometers must
be adjusted so as to set the maximum sensitivity for each cell, turning them all completely clockwise. Then, once

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the angle with the lowest output is located, act on the trimmers of the other cells until obtaining the same
minimum output value. This method can be very long, especially for large scales where the use of test weights
on the corners is not very practical. In these cases the second, more suitable method is to "pre-trim" the
potentiometers using a precision voltmeter (at least 4 1/2 digits). You can use the following procedure:
1) Determine the exact mV/V ratio of each load cell, shown in the calibration certificate of the cell itself.
2) Determine the exact excitation voltage provided by the indicator/meter (for example Z-SG), measuring this
voltage with the voltmeter (for example 10.05 V).
3) Multiply the lowest mV/V value found (point 1) by the excitation voltage (point 2).
4) Divide the trimming factor calculated in point 3 by the mV/V value of the other load cells.
5) Measure and adjust the excitation voltage of the other three load cells using the respective potentiometer.
Check the results and make a final adjustment by moving a test load from corner to corner.