Rice Lake 20 series User manual

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SCT Weight Transmitter
20 Series
Technical Manual
PN 131128 Rev D

Contents i
Contents
1.0 Introduction........................................................................................................................................ 1
1.1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.1 Weighing Instrument Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.2 Load Cell Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Load Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Load Cell Input Test (Quick Access) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.2 Load Cell Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Features of the SCT Weight Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.6 LED and Key Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Instrument Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.0 Configuration ..................................................................................................................................... 9
2.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.1 Theoretical Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.2 Maximum Capacity (NASS ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.3 Zero Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.4 Zero Value Manual Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.5 Weight (Span) Calibration (With Test Weights) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1.6 Setting Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1.7 Display Coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2 Filter On The Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3 Zero Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4 Serial Communication Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.4.1 RS-485 Serial Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5 SCT20-DN (DeviceNet™) Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6 Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6.1 Soldered Jumper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.6.2 Analog Output Type Scale Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.7 PROFIBUS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.8 SCT20-IP (EtherNet/IP™) Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.9 SCT20-IP (Ethernet TCP/IP) Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.10 Outputs And Inputs Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.11 Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.12 Setpoints Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.13 Reserved For The Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13.1 Menu Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13.2 Menu Unlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13.3 Temporary Menu Unlocking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13.4 Default Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13.5 Program Selection - Reverse: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.13.6 Program Selection - Not Legal: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.13.7 Keypad Or Display Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
© Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
Rice Lake Weighing Systems is an ISO 9001 registered company.
Technical training seminars are available through Rice Lake Weighing Systems.
Course descriptions and dates can be viewed at www.ricelake.com/training
or obtained by calling 715-234-9171 and asking for the training department.

ii SCT Weight Transmitter Technical Manual
Rice Lake continually offers web-based video training on a growing selection
of product-related topics at no cost. Visit www.ricelake.com/webinars
3.0 Operation.......................................................................................................................................... 32
3.1 Semi-automatic Tare (Net/Gross). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.2 Preset Tare (Subtractive Tare Device) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3 Semi-automatic Zero (Weight Zero-setting For Small Variations) . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.4 Peak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.6 SCT20-DN (DeviceNet) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.7 PROFIBUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.8 SCT20-IP (EtherNet/IP™) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.9 SCT20-TCP/IP (Ethernet TCP/IP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.10 Modbus/TCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.11 Modbus-RTU Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.12 ASCII Bidirectional Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.13 Fast Continuous Transmission Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
3.14 Continuous Transmission Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
3.15 Interface to Remote Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
3.16 Communication Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.0 Specifications.................................................................................................................................. 65

Introduction 1
1.0 Introduction
Manuals can be viewed and downloaded from the Rice Lake Weighing Systems website at
www.ricelake.com
Warranty information can be found on the website at www.ricelake.com/warranties
1.1 Saf e t y
Safety Symbol Definitions:
Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury, and
includes hazards that are exposed when guards are removed.
Indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate
injury.
Indicates information about procedures that, if not observed, could result in damage to equipment or
corruption to and loss of data.
General Safety
Do not operate or work on this equipment unless you have read and understand the instructions and
warnings in this manual. Contact any Rice Lake Weighing Systems dealer for replacement manuals.
Proper care is your responsibility.
Failure to heed may result in serious injury or death.
Electric shock hazard!
• There are no user serviceable parts. Refer to qualified service personnel for service.
• The unit has no power switch, to completely remove D/C power from the unit, disconnect the D/C power cable
from the main socket.
• For pluggable equipment the socket outlet must be installed near the equipment and must be easily accessible.
• Always disconnect from main power before performing any work on the device.
Do not allow minors (children) or inexperienced persons to operate this unit.
Do not operate without all shields and guards in place.
Do not use for purposes other then weighing applications.
Do not place fingers into slots or possible pinch points.
Do not use this product if any of the components are cracked.
Do not make alterations or modifications to the unit.
Do not remove or obscure warning labels.
Do not use near water.
Equipment Recommendations
Failure to follow the installation recommendations will be considered a misuse of the equipment.
To Avoid Equipment Damage
•Keep away from heat sources and direct sunlight.
•Protect the instrument from rain.
•Do not wash, dip in water or spill liquid on the instrument.
•Do not use solvents to clean the instrument.
•Do not install in areas subject to explosion hazard.
WARNING
CAUTION
Important
WARNING
Important

2SCT Weight Transmitter Technical Manual
1.1.1 Weighing Instrument Installation
The terminals to be connected to ground, as indicated on the SCT Weight Transmitter wiring guide, must have the
same potential as the scale structure ground. If unable to ensure this condition, connect a ground wire between the
SCT Weight Transmitter and the scale structure.
The load cell cable must be run separately to the SCT Weight Transmitter input and not share a conduit with other
cables. A shielded connection must be continuous without a splice.
Use RC filters (quencharcs) on the instrument-driven solenoid valve and remote control switch coils. To avoid
electrical noise in the SCT Weight Transmitter panel, use special filters or sheet metal partitions to isolate. The
panel installer must provide electrical protection for the instruments (fuses, door lock switch, etc.). It is
recommended to leave the equipment powered on at all times to prevent the formation of condensation.
Maximum Cable Lengths:
• RS-485: 1000 meters with AWG24, shielded and twisted cables
• RS-232: 15 meters for baud rates up to 19200
1.1.2 Load Cell Installation
The load cells must be placed on rigid, stable structures within 0.5 percent of plumb and level. It is important to use
the mounting modules for load cells to compensate for misalignment of the support surfaces.
Use waterproof sheaths and joints in order to protect the load cell cables.
Mechanical Restraints
When pipes are present, the use of hoses and flexible couplings and rubber skirted joints is recommended. In the
event of rigid conduit and 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 - Shocks - 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 scale is protected against lateral shifting and tipping
relating to shocks and vibration, windy conditions, seismic conditions and the stability of the support structure.

Introduction 3
Weighed Structure Grounding
Using a 10 gauge solid or braided wire or braided grounding strap, connect the load cell upper support plate with
the lower support plate, then connect all the lower plates to a single earth ground. Once installed, accumulated
electrostatic charges are discharged to the ground without going through or damaging the load cells. Failure to
implement a proper grounding system may not affect the operation of the weighing system; however, this does not
rule out the possibility that the cells and connected SCT Weight Transmitter may become damaged in the future. Do
not ground using metal parts contained in the weighed structure.
Figure 1-1. Installation Recommendations
1.2 Load Cells
1.2.1 Load Cell Input Test (Quick Access)
1. From the weight display, press for three seconds. is displayed.
2. Press . The response signal of the load cell is displayed, expressed in mV with four decimals.
3. Press three times to exit test mode.
1.2.2 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 load 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 load cell wire and between any other load cell wire
and the body of the load cell must be higher than 20 Mohm (megohms).
Ground plate used to
continue ground.
Structure used to
continue ground.

4SCT Weight Transmitter Technical Manual
Load Cell Voltage Measurement (Use A Digital Multimeter)
• Remove the weight of the scale from the load cell to be tested.
• Make sure that the excitation wire of the load cell connected to the instrument is 5 Vdc +/- 3 percent.
• Measure the millivolt signal between the positive and the negative signal wires by directly connecting
them to the multi-meter. Make sure it reads between 0 and 0.5 mV.
• Apply load to the load cell and make sure that there is a signal increment.
If one of the above conditions is not met, please contact Rice Lake Weighing Systems Customer Support
for assistance.
1.3 Connectivity
Figure 1-2. Connectivity
1.4 Features of the SCT Weight Transmitter
• Weight indicator and transmitter for Omega/DIN rail mounting suitable for back panel; space saving
vertical shape.
• Six-digit semi alphanumeric display (18mm h), 7 segment.
• Four-key keyboard. Dimensions: 25 x 115 x 120 mm.
• Displays the gross weight; with an external contact capable of remote zeroing and gross/net switching.
• Peak weight function.
• Analog Output Option - Transmits the gross or net weight via opto-isolated analog output 16 bit, current 0-
20mA, 4-20mA or voltage 0-10V, 0-5V (±0V / ±5V by closing a soldered in jumper).
The DeviceNet™ Option has a DeviceNet DP V0 Source port that allows the device to exchange the main system
parameters with a DeviceNet primary.
The PROFIBUS Option has a PROFIBUS-DP V0 Source port that allows the device to exchange the main system
parameters with a PROFIBUS primary.
The Ethernet Option has an EtherNet/IP™ device port that allows the device to exchange the main system
parameters with an EtherNet/IP scanner.
The Modbus/TCPOption has a Modbus/TCP device port that allows the device to exchange the main system
parameters with a Modbus/TCP primary.
The SCT Weight Transmitter transmits the gross or net weight via RS-485 serial port, by means of protocols:
• Modbus RTU
• ASCII bidirectional protocol
• Continuous transmission
Important
ANALOG OUTPUT
(Current and Voltage)
PLC
PLC or FIELD SIGNALS
2 DIGITAL INPUTS
(Optoisolated,
Externally supplied)
JUNCTION BOX
3 RELAY
MAX 8 LOAD CELLS IN
PARALLEL
RS-485
RS-232
Modbus RTU
SERIAL PORT
DC power
supplier
(12-24 Volt )
Other Options
DeviceNet
Profibus
Ethernet
OUTPUTS

Introduction 5
1.5 Electrical Connections
Basic Information
• It is recommended that the negative side of the power supply be grounded.
• It is possible to power up to eight 350 ohm load cells or sixteen 700 ohm load cells.
• For 4-wire load cells, make a jumper between EX- and REF- and between EX+ and REF+.
• Connect terminal 0 VDC to the RS-485 common when interfacing to A/C powered equipment so that there
is an opto-isolated RS-485 connection.
• In the event of an RS-485 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. See Section 2.4.1 on page 20.
Figure 1-3. Wiring Diagram
Three outputs: configurable setpoints or remote output management via protocol.
Two inputs: default of SEMI-AUTOMATIC ZERO input 1; NET/GROSS input 2. See Section 2.10 on page 27.
+ EXCITATION
- EXCITATION
4-wire load cell
connection
SHIELD
+ SIGNAL
- SIGNAL
1
2
3
4
5
6
RS485
Relay
Outputs
115Vac / 150mA
12-24Vdc
- SIGNAL
+ EXCITATION
SHIELD
- EXCITATION
- SENSE
+ SENSE
Inputs
5-24Vdc
+ SIGNAL
+-
Current output: max load 300 ohm
Voltage output: min. load 10 kohm
6-wire load cell
connection
Analog Output shown
See below for
DeviceNet, PROFIBUS,
Ethernet/IP or Modbus/TCP
RS485 Termination
POWER
EX
-
REF
-
1
EX
+
2
REF
+
3
SIG
+
6
IN1
7
IN2
8
IN COM
9
mA
10
V
11
mA-V COM
12
4
SIG
-
5
OUT1 OUT2 OUT3
OUT COM
+ RS485
- RS485
+ 12-24
0 VDC
13 14 15 18 19 20 16 17
SCT
20-AN
DeviceNet
CAN V-
10 11
12 13 14
CAN L CAN H CAN V+
CAN SHLD
CAN Termination
EX
-
REF
-
1
EX
+
2
REF
+
3
SIG
+
6
IN1
7
IN2
8
IN COM
9 4
SIG
-
5
PROFIBUS-DP
EX
-
REF
-
1
EX
+
2
REF
+
3
SIG
+
6
IN1
7
IN2
8
IN COM
9 4
SIG
-
5
Profibus Termination
Ethernet/IP
EX
-
REF
-
1
EX
+
2
REF
+
3
SIG
+
6
IN1
7
IN2
8
IN COM
9 4
SIG
-
5
EtherNet/IP
RJ-45
Profibus DP
Socket DB-9
Modbus/TCP
EX
-
REF
-
1
EX
+
2
REF
+
3
SIG
+
6
IN1
7
IN2
8
IN COM
9 4
SIG
-
5
Modbus/TCP
RJ-45

6SCT Weight Transmitter Technical Manual
1.6 LED and Key Functions
LED Main Function Secondary Function *
NET Net weight LED None
Zero LED (deviation from zero not more than +/- 0.25 divisions) LED lit: output 3 closed
Stability LED LED lit: output 2 closed
kg Unit of measure: kg LED lit: output 1 closed
g Unit of measure: g LED lit: input 2 closed
L Unit of measure: lb LED lit: input 1 closed
To activate the secondary LED function, press and hold , then press .
Table 1-1. LED Functions
LED Function
DeviceNet Status Blinks quickly: DeviceNet OK
Blinks slowly (about 0.5s): Initialization
LED lighted: source not initialized
LED off: DeviceNet KO
Table 1-2. DeviceNet Model LED Function
LED Function
PROFIBUS Status Blinks quickly: PROFIBUS OK
Blinks slowly (about 0.5s): PROFIBUS error
Table 1-3. PROFIBUS Model LED Function
LED Function
EtherNet/IP Status Blinks quickly: Ethernet OK
Blinks slowly (about 0.5s): EtherNet/IP KO
RJ45 Connector
Left side [Link LED]
Off: no link
Amber: 10 Mbps
Green: 100 Mbps
RJ45 Connector
Right side [Activity LED]
Off: no activity
Amber: half duplex
Green: full duplex
Table 1-4. Ethernet Model LED Function
Figure 1-4. Display
0

Introduction 7
Key Functions
Figure 1-5. SCT Weight Transmitter Display and Keys
The LEDs are activated in sequence to indicate that a setting and not a weight is being viewed.
After pressing the first digit will flash and can be edited.
For numeric entries, press to select desired digit, then press to increment the digit.
LED Function
Modbus/TCP Status Blinks quickly: Modbus/TCP OK
RJ45 Connector
Left side [Link LED]
Off: no link
Amber: 10 Mbps
Green: 100 Mbps
RJ45 Connector
Right side [Activity LED]
Off: no activity
Amber: half duplex
Green: full duplex
Table 1-5. Modbus Model LED Funciton
KEY
Short press in weigh
mode
Long press
(3 sec) in
weigh mode Function within Setup Menus
Escape
— Zero Setting Escape from a parameter or return to previous menu or operation
mode.
Scroll/
Backspace
Captures Tare
Gross Net
Removes
Ta r e
Net Gross
Move to the previous parameter in a level or scroll to the next digit in a
parameter value.
Next/ Data
Entry
Save to alibi memory
(if present)
mV load cell
test
Move to the next parameter in a level or increment a value in a
parameter.
Enter
Setting setpoints and
hysteresis
— Move to next level of configuration or select and edit a parameter.
and Enter configuration for setting general parameters (press and hold then press to enter setup menu).
and Setting preset tare (press and hold then press to enter setup menu.
Table 1-6. Key Definitions
Note

8SCT Weight Transmitter Technical Manual
1.7 Instrument Commissioning
1. Plug power cord into an outlet to power on the indicator. The display shows in sequence:
• SU followed by the software code ()
• r followed by the software version ()
• HU followed by the hardware code ()
• The serial number ()
2. Check that the display shows the weight and that there is an increase in weight when loading the load cells.
If there is not, check and verify the connections and correct positioning of the load cells.
3. Confirm that the SCT Weight Transmitter has been theoretically calibrated, the load cell’s rated data is
already entered and that the plant system identification tag is present on the instrument and on the cover.
If the instrument has not been calibrated, follow the calibration instructions in Section 2.1 on page 10 before
proceeding to next step
4. Reset to zero. See Section 2.1.3 on page 13.
5. Check the calibration with test weights and correct the indicated weight if necessary. See Section 2.1.5 on
page 14.
6. Set the desired output type and the full scale value.
• Analog Output Model (Section 2.6 on page 21)
• DeviceNet Model (Section 2.5 on page 21)
• Ethernet Model (Section 2.8 on page 24)
• PROFIBUS Model (Section 2.7 on page 23)
• Modbus/TCP (Section 3.10 on page 46)
7. If using serial communication, set the related parameters. See Section 2.4 on page 18.
8. If setpoints are used, set the required weight values and the relevant parameters. See Section 2.10 on page
27 and Section 2.12 on page 29.
Note

Configuration 9
2.0 Configuration
Scale Menu
Figure 2-1. Scale Menu Structure
Parameter Options Description
 








Calibration (Section 2.1 on page 10)
 

Filter on the weight (Section 2.2 on page 16)
 


Zero Parameters (Section 2.3 on page 17)
 






Serial Communications settings (Section 2.4 on page 18)
 

DeviceNet options for outputs and inputs configuration
(Section 2.10 on page 27)
Table 2-1. Configuration Parameters
W(6W2XW,Q

+
+
+
,Q
2XW
18&(/
Enter #
DeviceNet
Models
3W$U(6(W3
Profibus
Models
68$3
<(6
Q2
Ethernet
Models
*$W8$<
&
E
$
G
68EQ(7
&
E
$
G
3$GGU
&
E
$
G
6(U,$/
E$8G
G(8Q(W
Enter #
$GGU
6(W
$X72
7U$&
3$U$










),/W(U&$/,E
Analog
Models
$1$/2*
3U2), (W+Q(W
$GGU
Enter #
See Figure 2-2
on page10.
See Figure 2-3
on page18.
See Figure 2-5
on page21.
See Figure 2-9
on page27.

10 SCT Weight Transmitter Technical Manual
2.1 Calibration
Figure 2-2. Calibration Menu Structure
 





Analog options for outputs and inputs configuration
(Section 2.10 on page 27)
  PROFIBUS settings (Section 2.7 on page 23)
 



SCT20-IP (EtherNet/IP) settings (Section 2.8 on page 24)
 




Outputs and Inputs configuration (Section 2.10 on page
27)
 


Test (Section 2.11 on page 29)
Parameter Options Description
Table 2-1. Configuration Parameters (Continued)
G,8,6 8(,*+W )6W(2
Enter #
6(Q6/E
Enter #
1$66
Enter #
=(U2
Enter # Enter #
,13
Enter #



















),/W(U 3$U$ 6(U,$/ W(6W2XW,Q$1$/2*
 6(W3
&$/,E
3W$U(
XQ,W &2())
/,WU(
E$U
$W1
3,(&(
Q(8WRQ
OE
2W+(U
+,/2*
+,/21
Q(81
*
W
Enter #

Configuration 11
Parameter Options Description
 Enter #
 System Full Scale is determined by multiplying one load cell capacity by the number of load cells
used. Example of system full scale value calculation:
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.
 Enter #

to


Sensitivity is a load cell rated parameter expressed in mV/V. Set the average sensitivity value
indicated on the load cells. 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.
 


















Division (resolution) is the weight increment (display division size) that the scale counts by.
Selections are: 0.0001 and 100 with x1 x2 x5 x10 increments.
 Enter #

to
max full
scale
Maximum Capacity (Live Load/Product) that can be displayed. When the weight exceeds this
value by 9 divisions, the display will go to dashes, indicating overload.
Setting this value to 0 will disable the over capacity function.


Zero is used to capture the deadload of the scale system. With the scale empty, the displayed value
can be zeroed off. This menu may also be accessed directly from the weighing mode to compensate
for zero changes or variations.
Press to display the accumulated deadload weight that has been zeroed off.
 Enter #
to


Estimated dead load value of the scale when a scale contains product that cannot be removed.
The value entered is the dead load. This value will be replaced if the zero function is performed.
Table 2-2. Calibration Menu Parameters
Note

12 SCT Weight Transmitter Technical Manual
To calibrate the instrument, the theoretical calibration (Section 2.1.1 on page 12) must be completed first.
After theoretical calibration is set, the scale can be set with actual weights (Section 2.1.5 on page 14).
2.1.1 Theoretical Calibration
This function allows load cell rated values to be set. To perform the theoretical calibration set ,  and
 in sequence. See Figure 2-2 on page10.
1. Press and hold , then press .  is displayed.
2. Press .  is displayed. Press .
3. Press or until total load cell capacity (system full scale) is displayed. Press .
4. Press or until  is displayed. Press .
5. Press or until desired load cell mV/V is displayed. Press .
6. Press or until  is displayed. Press .
7. Press or until desired display division size is displayed. Press .
8. Press twice to exit setup menu.
By modifying the theoretical full scale, the sensitivity or divisions, the Weight (Span) Calibration is canceled
and only the theoretical calibration is considered valid.
If the theoretical full scale and the recalculated full scale in Weight (Span) calibration (Section 2.1.5 on page
14) are equal, this means that the calibration currently in use is theoretical calibration; if they are different, the
calibration in use is the Weight (Span) Calibration based on test weights.
By modifying the theoretical full scale, the sensitivity or divisions and all the system’s parameters containing a
weight value will be set to default values (setpoints, hysteresis, etc.).
 Enter #
Weight (Span) Calibration - after the theoretical calibration is complete and zero is set, the
calibration can be adjusted with actual test weights by changing the displayed value in this
parameter.
If changes are made to the theoretical Full Scale ( ), the Sensitivity
() or Divisions () parameters, the Weight (Span) Calibration is
canceled and the theoretical calibration is initiated and applied.
If the theoretical full scale ( ) and the capacity full scale ( ) are equal in Weight
(Span) Calibration ( ), then the calibration currently in use is theoretical. If they are
different, the calibration in use is the Weight (Span) Calibration based on calibration weights.
If changes are made to the theoretical full scale ( ), the capacity full scale ( ) or
divisions ( ) parameters, all the system’s parameters containing a weight value will
be set to default values (setpoints, hysteresis, etc.).
 











Unit of Measure - determines what unit of measure is displayed and printed.
See Section 2.1.6 on page 14 for a description of units.
 Enter #


Multiplier Value entered will display an alternative unit of measure if the digital input is set for COEFF
and is in a closed state.
Parameter Options Description
Table 2-2. Calibration Menu Parameters (Continued)
Note
Note
Note

Configuration 13
2.1.2 Maximum Capacity (NASS )
Maximum capacity is the highest weight of live load/product that can be displayed. When the weight exceeds this
value by 9 divisions, the following is displayed: ------. To disable this function, set to 0.
1. Press and hold , then press .  is displayed.
2. Press ,  is displayed.
3. Press or until  is displayed. Press .
4. Press or until desired capacity is displayed. Press .
5. Press twice to exit setup menu.
2.1.3 Zero Setting
Use Zero Setting to zero the scale after use or to compensate for variations due to environmental factors.
Perform this procedure after having set the theoretical calibration. See Section 2.1.1 on page 12.
This menu may also be accessed directly from the weight display. Press and hold for three seconds.
1. Press and hold , then press .  is displayed.
2. Press .  is displayed.
3. Press or until  is displayed. Press . The weight value to be set to zero is displayed and all of
the LEDs are flashing.
4. Press , the weight is set to zero and the value is stored to the permanent memory.
5. Press twice to exit set-up menu.
Press to display the accumulated deadload that has been zeroed off by the instrument, displaying the sum
of all of the previous zero settings.
2.1.4 Zero Value Manual Entry
Perform this procedure only if it is not possible to zero off the scale structure, for example because it
contains product that can not be unloaded.
Enter the estimated structured dead load value that would be zeroed.
1. Press and hold , then press .  is displayed.
2. Press ,  is displayed.
3. Press or until  is displayed. Press .
4. Press or until desired dead load value is displayed. Press .
5. Press twice to exit set-up menu.
Note
Note
Important

14 SCT Weight Transmitter Technical Manual
2.1.5 Weight (Span) Calibration (With Test Weights)
After performing the theoretical calibration (Section 2.1.1 on page 12) and the Zero setting (Section 2.1.3 on page
13), this function allows calibration to be done using test weights of known value. If adjustment is required, change
the displayed value to display the test weight value.
1. Load the test weight onto the scale, use as high of a percentage of the maximum quantity to be weighed as
possible.
2. Press and hold , then press .  is displayed.
3. Press .  is displayed.
4. Press or until  is displayed.
5. Press . The value of the weight currently on the system will be flashing on the display. All of the LEDs
are off. (If adjustment is not required, skip to step 8.)
6. Adjust the value on display to match weight loaded on the scale if necessary, by pressing or . The
LEDs will begin scrolling.
7. Press , the new set weight is displayed with all the LEDs flashing.
8. Press ,  will be displayed again.
9. Press twice to exit set-up menu.
Example:
For a system of maximum capacity of 1000 kg and 1 kg division, two test weights are available, one 500 kg and one 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.
Identify and correct any mechanical problems before repeating the procedure.
If theoretical full scale and recalculated full scale in Weight (Span) Calibration are equal, it means that the
theoretical calibration is currently in use; otherwise, the Weight (Span) Calibration based on test weights is in
use.
If the correction made changes the previous full scale for more than 20 percent, all the parameters with
settable weight values are reset to default values.
Linearization Option On Max 5 Points:
It is possible to perform a linearization of the weight by performing the Weight (Span) Calibration (With Test
Weights) with up to a maximum of five points, using five different test weights. The procedure ends by pressing
or after entering the fifth value. At this point it will no longer be possible to change the calibration value; a new
Weight (Span) Calibration would need to be performed. To perform a new calibration, return to the weight display
and then re-enter the calibration menu.
By pressing after having confirmed the test weight that has been set, the full scale displays the value of the
maximum test weight entered and references the cell sensitivity set in the theoretical calibration ().
2.1.6 Setting Units of Measure
1. Press and hold , then press .  is displayed.
2. Press ,  is displayed.
3. Press or until  is displayed. Press .
4. Press or until desired unit is displayed. Press .
5. Press twice to exit set-up menu.
Important
Note

Configuration 15
Table 2-3. Units of Measure
If the print function is enabled, the symbol of the selected unit of measure will be printed after the measured
value.
2.1.7 Display Coefficient
By setting the coefficient, the display is changed accordingly.
If one of the inputs is set to  mode (Section 2.10 on page 27) when the input is closed the value displayed
will be modified according to the coefficient. When the input is opened the standard weight display will be
restored.
1. Press and hold , then press to enter set-up menu,  will be displayed.
2. Press ,  is displayed.
3. Press or until  is displayed. Press .
4. Press or until desired number is displayed. Press .
5. Press twice to exit set-up menu.
All other settings (setpoints, hysteresis, calibration. etc.) are expressed in weight value. To convert them
to the new unit of measurement, perform a “Theoretical Calibration For Other Units Of Measure” on
page 16 or a “Weight (Span) Calibration For Other Units Of Measure” on page 16 to change the system
calibration. The parameter
 must remain set to 1.0000.
Unit Display Description
 Kilograms
 Grams
 To n s *
 Pounds
 Newtons*
 Liters*
 Bars*
 Atmospheres*
 Pieces*
 Newton meters*
 Kilogram meters*
 Other generic units of measure not included on the list*
* Indicates it is possible to set the display coefficient. To use  it is
necessary to enable it, closing the  input. See Section 2.1.7.
Display Definition Display Coefficient
 pounds The value set in  will be multiplied by the weight value currently displayed.
 newton The value set in  will be multiplied by the weight value currently displayed.
 litres In  set the specific weight in kg/l, assuming that the system is calibrated in kg.
 bar The value set in  will be multiplied by the weight value currently displayed.
 atmospheres The value set in  will be multiplied by the weight value currently displayed.
 pieces In  set the weight of one piece.
 newton metres The value set in  will be multiplied by the weight value currently displayed.
 kikgram metres The value set in  will be multiplied by the weight value currently displayed.
 other generic units of
measure not included in list
The value set in  will be multiplied by the weight value currently displayed.
Table 2-4. Display Coefficient
Note
Important