Rice Lake SCT-10 User Manual

SCT Weight Transmitter

10 Series

Installation & Operator’s Manual

131129 Rev A

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.

1.0 Introduction............................................................................ 1

1.1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Safety Symbol Definitions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.3 Equipment Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.1.4 Correct Installation Of Weighing Instruments . . . . . . . . . . . . . . . . . . . 2

1.1.5 Correct Installation Of The Load Cells. . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2 Load Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.1 Load Cell Input Test (Quick Access) . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.2 Load Cell Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5 LED and Key Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.6 Instrument Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.6.1 If The Instrument Has Not Been Calibrated. . . . . . . . . . . . . . . . . . . . . 8

2.0 Configuration ......................................................................... 9

2.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1.1 Theoretical Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1.2 Maximum Capacity (NASS ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1.3 Zero Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.1.4 Zero Value Manual Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.1.5 Weight (Span) Calibration (With Test Weights) . . . . . . . . . . . . . . . . . 16

2.1.6 Setting Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.1.7 Display Coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2 Filter On The Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3 Zero Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.4 Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.5 Serial Communication Settings . . . . . . . . . . . . . . . . . . . . . . . 23

2.5.1 RS-485 Serial Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.6 Outputs And Inputs Configuration . . . . . . . . . . . . . . . . . . . . . 26

2.7 Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.8 Setpoints Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.9 Reserved For The Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.9.1 Default Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.9.2 Program Selection - Reverse:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.9.3 Keypad Or Display Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Specifications subject to change without notice.

Rice Lake Weighing Systems is an ISO 9001 registered company.

December 27, 2013

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) 33

3.4 Peak. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.6 Modbus-RTU Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.7 ASCII Bidirectional Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.8 Fast Continuous Transmission Protocol . . . . . . . . . . . . . . . . 46

3.9 Continuous Transmission Protocol To Remote Displays . . . 46

3.10 Communication Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 48

SCT Weight Transmitter Limited Warranty ................................... 51

For More Information .................................................................... 53

ii SCT Weight Transmitter Operator’s Manual

1.0 Introduction

WARNING

Important

WARNING

1.1 Safety

1.1.1 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 information about procedures that, if not observed, could result in damage to equipment or corruption to and loss of data.

1.1.2 Safety Precautions

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 System dealer for replacement manuals. Proper care is your responsibility.

Failure to heed may result in serious injury or death.

Risk of electrical shock. 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.

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.

Introduction 1

1.1.3 Equipment Recommendations

Important

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.

1.1.4 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 scale structure (ground). If you are unable to ensure this condition, connect a ground wire between the instrument and the scale structure.

• The load cell cable must be run separately to the instrument input and not share a conduit with other cables. A shielded connection must be continuous without a splice.

• Use “RC” filters (quench-arcs) on the instrument-driven solenoid valve and remote control switch coils.

• Avoid electrical noise in the instrument panel; if inevitable, 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 advisable to leave equipment always switched on to prevent the formation of condensation.

• Maximum Cable Lengths:

- RS-485: 1000 metres with AWG24, shielded and twisted cables

- RS-232: 15 metres for baud rates up to 19200

1.1.5 Correct Installation Of The Load Cells

Installing Load Cells:

The load cells must be placed on rigid, stable structures within .5% of plumb and level. It is important to use mounting modules for load cells to compensate for misalignment of the support surfaces.

Protection Of The Load Cell Cable:

Use water-proof sheaths and joints in order to protect the cables of the load cells.

Mechanical Restraints (pipes, etc.):

When pipes are present, we recommend the use of hoses, flexible couplings and rubber skirted joints. In case 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.

2 SCT Weight Transmitter Operator’s Manual

Windy Conditions - Shocks - Vibrations:

Uses ground plate

to continue ground.

Uses structure to continue ground.

ESC

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 stability of the support structure.

Grounding The Weighed Structure:

By means of a 10ga 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 electrostatic charges accumulated are discharged to the ground without going through or damaging the load cells. Failure to implement a proper grounding system might not affect the operation of the weighing system; this, however, does not rule out the possibility that the load cells and connected instrument may become damaged by ESD. It is forbidden to ensure grounding system continuity by using metal parts contained in the weighed structure.(see Figure 1-1.)

1.2 Load Cells

1.2.1 Load Cell Input Test (Quick Access)

1. From the weight display, press for 3 seconds.

2. The display will read NU-CEL. Press .

3. The response signal of the load cell is displayed, expressed in mV with

four decimals. Press three times to exit set-up mode.

Figure 1-1. Installation Recommendations

Introduction 3

1.2.2 Load Cell Testing

Important

ANALOG OUTPUT

(Current and Voltage)

PLC

PLC or FIELD SIGNALS

2 DIGITAL INPUTS

(Optoisolated, Externally supplied)

2 RELAY

MAX 8 LOAD CELLS IN

PARALLEL

RS-485 RS-232 Modbus RTU

SERIAL PORT

DC power

supplier

(12-24 Volt )

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 (mega ohms).

Load Cell Voltage Measurement (Use A Digital Multimeter):

• Remove weight of scale from load cell to be tested.

• Make sure that the excitation wires of the load cell connected to the instrument is 5 Vdc +/- 3%.

• Measure the millivolt signal between the positive and the negative signal wires by directly connecting them to the multi-meter, and make sure it reads between 0 and 0.5 mV (thousandths of a Volt).

• 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 the technical assistance service.

1.3 Specifications

• 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: 25x115x120 mm.

• Displays the gross weight; with an external contact capable of remote zeroing and gross/net switching.

• IP67 box version (dimensions: 170x140x95mm). Four fixing holes diameter 4mm (center distance 122x152mm).

• Peak weight function.

4 SCT Weight Transmitter Operator’s Manual

• 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 jumper).

• Transmits the gross or net weight via RS-485 serial port, by means of protocols:

- Modbus RTU

- ASCII bidirectional protocol

- Continuous transmission

Power Supply And Consumption (VDC) 12 - 24 VDC (standard)+/- 10% ; 5 W No. Of Load Cells In Parallel and

Supply Linearity / Analog Output Linearity < 0.01% F.S. ; < 0.01% F.S. Thermal Drift / Analog Output Thermal

Drift A/D Converter 24 bit (16.000.000 points) Max Divisions (With Measurement

Range: +/-10mv = Sens. 2mv/v) Measurement Range +/- 19.5 mV Max Sensitivity Of Usable Load Cells +/-3mV/V Max Conversions Per Second 80 conversions/second Display Range - 999999 ; + 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 0.080 – 7.5 sec / 5 - 80 Hz Relay Logic Outputs N.2 - max 24 VAC ; 60mA Logic Inputs N.2 - optoisolated 5 - 24 VDC PNP Serial Ports RS-485 (RS-232) Baud Rate 2400, 4800, 9600, 19200, 38400,

Humidity (Non Condensing) 85 % Storage Temperature - 30°C + 80°C Working Temperature - 20°C + 60°C Optoisolated Analog Output 16 Bit -

65535 Divisions

max 8 ( 350 ohm ) ; 5VDC/120mA

< 0.0005 % F.S. /°C ; < 0.003 % F.S./°C

+/- 999999

115200

0-20 mA; 4-20 mA (max 300 ohm); 0-10 VDC; 0-5 VDC; +/- 10 VDC; +/- 5 VDC (min 10 kohm).

Table 1-1. Technical Specifications

Introduction 5

1.4 Electrical Connections

13123456789 111210

141516 17 18 19 20

LOAD CELLS IN PARALLEL

IN1

IN2

IN COM

OUT1

OUT2

+ RS485

RS485

mA-V COM

NET 0

INPUTS 5-24Vdc

OUTPUTS

24Vdc

60mA

RS485

OUTPUT

12-24Vdc

ANALOG

RS485 termination

ESC

333130 322827252324 26 2922 34

+ 12-24

0 VDC

POWER

+ EX

SIG

+ SIG

+ EX

SIG

+ SIG

+ EX

SIG

+ SIG

+ EX

SIG

+ SIG

SCT

Current output: max load 300 Ohm Voltage output: min. load 10 kOhm

- EXCITATION

+ EXCITATION

- SIGNAL

+ SIGNAL

- EXCITATION

+ EXCITATION

- SIGNAL

+ SIGNAL

- EXCITATION

+ EXCITATION

- SIGNAL

+ SIGNAL

- EXCITATION

+ EXCITATION

- SIGNAL

+ SIGNAL

• 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.

• Connect terminal “0 VDC” to the RS-485 common of the connected instruments in the event that these receive alternating current input or that they have an opto-isolated RS-485.

• In case 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 2.5.1 “RS-485 Serial Communication” on page 25

2 outputs: configurable setpoints or remote output management via protocol. 2 inputs (Default: SEMI-AUTOMATIC ZERO input 1; NET/GROSS input

2): settable to have the following functions: SEMI-AUTOMATIC ZERO, NET/GROSS, PEAK, or REMOTE CONTROL (see Section 2.6 “Outputs

And Inputs Configuration” on page 26).

6 SCT Weight Transmitter Operator’s Manual

1.5 LED and Key Functions

ESC

TARE

ESC

TARE

Note

LED Main function Secondary function *

NET Net weight LED: net weight display (semi-

automatic tare or preset tare) Zero LED (deviation from zero not more than +/-

0.25 divisions)

Stability LED LED lit: output 1 closed kg Unit of measure: kg LED lit: output 2 closed g Unit of measure: g No meaning L Unit of measure:lb No meaning

* To activate the secondary LED function, during weight display press and hold

, then press .

Long press

Key Short press

(3 sec) Into menus

Zero Setting Cancel or return to previous

Escape

Captures Tare Gross  Net

Removes Tare Net  Gross

Scroll/

Backspace

mV load cell test

Next/ Data

Entry

Setting setpoints and hysteresis

Enter

LED lit: input 1 cosed

LED lit: input 2 closed

Select figure to be modified or return to previous menu item

Modify selected figure or go to next menu item

Confirm or enter in submenu

+ Setting general parameters (press and hold then press

to enter set-up menu.

+ Setting preset tare (press and hold then press to enter

set-up menu.

The LEDs light up in sequence to indicate that a setting and not a weight is being viewed.

Introduction 7

1.6 Instrument Commissioning

Note

1. Plug power cord in to outlet to turn on indicator, the display shows in sequence:

-“SU” followed by the software code (e.g.: SU S );

-- “r” followed by the software version (e.g.: r 1.04.01 );

-- “HU” followed by the hardware code (e.g.: HU 104 );

- - the serial number (e.g.:1005 15 );

2. Check that the display shows the weight and that when loading the load cells there is an increase in weight.

3. If there is not, check and verify the connections and correct positioning of the load cells.

If instrument has NOT been calibrated complete Section 2.1 before proceeding to next step.

4. Reset to zero. See Section 2.1.3 “Zero Setting” on page 15.

5. Check the calibration with test weights and correct the indicated weight if necessary. See Section 2.1.5 “Weight (Span) Calibration (With Test Weights)” on page 16.

6. If you use the analog output, set the desired analog output type and the full scale value. See Section 2.4 “Analog Output” on page 21.

7. If you use serial communication, set the related parameters. See Section

2.5 “Serial Communication Settings” on page 23.

8. If setpoints are used, set the required weight values and the relevant

parameters. See Section 2.8 “Setpoints Programming” on page 29 and Section 2.6 “Outputs And Inputs Configuration” on page 26.

1.6.1 If The Instrument Has Not Been Calibrated

Missing plant system identification tag, proceed with calibration:

1. If load cells data are unknown, follow the procedure in Section 2.1.5 “Weight (Span) Calibration (With Test Weights)” on page 16.

2. Enter the rated data of load cells following the procedure given in Section 2.1.1 “Theoretical Calibration” on page 14.

8 SCT Weight Transmitter Operator’s Manual

2.0 Configuration

CALIB FILTER PARA 0

SERIAL

0 SET

AUTO 0

TRAC 0

TESTOut-In

2 3 4 5

8 9

See

Serial

Submenu

See

Calib

Submenu

See

Serial

Submenu

OUT

NU CEL

Enter #

ANALOG

MODE

TYPE

Enter #

0-10 V

0-20 mA

4-20mA

ANA 0 ANA FS COR FSCOR 0

Enter #

Enter #Enter #

-5+5 V

-10+10 V

0-5 V

Gross

Net

000000

PtArE

SEtP1

Figure 2-1. Scale Menu Structure

Configuration 9

Parameter Choices Description

CALIb FS-tEO

See Section 2.1“Calibration” on page 11.

SEnS I b dI UI S NASS ZErO 1 NP 0 WEIGHt unIt COEFF

FILTER 0-9

4 *

PArA 0 0 SEt

AuTO 0 trAC 0

ANALOG tYPE

NOdE ANA 0 ANA FS COr 0 COr FS

SErIAL rS-485

bAud Addr dELAY PArItY STOP

Out-In Out 1

Out 2 In 1 In 2

tESt In

Out ANALOG NU-CEL

- indicates default value.

Allows a stable weight display to be obtained. See Section 2.2 “Filter On The Weight” on page 19.

See Section 2.3 “Zero Parameters” on page 20.

See Section 2.4 “Analog Output” on page 21.

See Section 2.5 “Serial Communication Settings” on page 23.

See Section 2.6 “Outputs And Inputs Configuration” on page 26.

See Section 2.7 “Test” on page 28.

Table 2-1. Scale Menu

10 SCT Weight Transmitter Operator’s Manual

2.1 Calibration

dI UI S

WEIGHt

unIt

COEFF

LItrE

bAr AtN

PI ECE

nEUton

OtHEr

HI LOG

HI LO-N

nEU-N

G t

FS-tEO

Enter #

SEnS Lb

Enter #

NASS

Enter #

ZErO

Enter #

Enter # Enter #

I NP 0

Enter #

100

0.0001

0.0002

0.002

0.005

0.001

0.0005

2 5

0.02

0.05

0.01

0.2

0.5

0.1

FILtEr

PArA 0 SErIAL

tESt

Out-In

ANA LOG

000000

SEtP1

CALIb

PtArE

Note

Figure 2-2. Calibration Menu Structure

Parameter Choices Description

FS-TED Enter #

deno *

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 1000kg ---->

FULL SCALE = 1000 X 4 = 4000

The instrument is supplied with a theoretical full scale value deno

SENS LB Enter #

0.50000

7.00000

2.00000 *

Sensitivity is a load cell rated parameter expressed in mV/V. Set the average sensitivity value indicated on the load cells. I Example of 4-cell system with sensitivity

2.00100, 2.00150, 2.00200, 2.00250;

calculated as (2.00100 + 2.00150 + 2.00200 +

Table 2-2. Calibration Menu

corresponding to 10000. To restore factory values, set 0 as full scale.

enter 2.00175,

2.00250) / 4.

Configuration 11

Parameter Choices Description

TARE

dI UI S 1

2 * 5 10

Division (resolution) - the weight increment (display division size) that the scale counts by. Selections are: 0.0001 and 100 with x1 x2 x5 x10 increments.

20 50 100

0.0001

0.0002

0.0005

0.001

0.002

0.005

0.01

0.02

0.05

0.1

0.2

0.5

NASS Enter #

0 *

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

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 weight that

has been zeroed off.

INP 0 Enter #

0 to 999999 0 *

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 later.

Table 2-2. Calibration Menu

12 SCT Weight Transmitter Operator’s Manual

Parameter Choices Description

Note

WEIGHT Enter #

0 *

UNIT G

COEFF Enter #

- indicates default value.

t Lb * nEUton LI trE bAr AtN PI ECE nEU-N HI LO-N OtHEr HI LOG

0-99.9999 0 *

Weight (Span) Calibration - after the Theoretical Calibration has been completed 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 (

SEnSIb

( parameters, the weight (span) calibration is cancelled and the theoretical calibration is initiated and applied.

If the theoretical full scale ( capacity full scale ( (span) 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 (

FS-tEO

divisions ( parameters containing a weight value will be set to default values (setpoints, hysteresis, etc.).

Unit of Measure - select to determine what unit of measure is displayed and printed.

See Section 2.1.6 “Setting Units of Measure” on page 17 for description of units.

Multiplier Value entered will display an alternative unit of measure if the digital input is set for COEFF and is in a closed state.

), the capacity full scale (

dI UI S

FS-tEO

) or Divisions (

FS-tEO

NASS

) are equal in weight

WEIGHt

), then the calibration

) parameters, all the system’s

), the Sensitivity

dI UI S

)

) and the

NASS

) or

Table 2-2. Calibration Menu

To calibrate the instrument, the “Theoretical Calibration” on page 14 must be completed first. After Theoretical Calibration is set, the scale can be set with actual weights (see Section 2.1.5 “Weight (Span) Calibration (With Test Weights)” on page 16).

Configuration 13

2.1.1 Theoretical Calibration

Note

ESC

TARE

ESC

Note

ESC

This function allows load cell rated values to be set. To perform the theoretical calibration set FS-tED, SEnS lb and dI UI S in

sequence:

When entering a menu, the LED’s will begin scrolling, when selection is made and confirmed the LED’s will be off.

1. Press and hold , then press , CALIb will be displayed.

2. Press , FS-tEO is displayed. Press .

3. Press or

until total load cell capacity (system full scale) is

displayed, press .

4. Press or

5. Press or

until SEnS lb is displayed, press .

until desired load cell mV/V is displayed,

press .

6. Press or

7. Press or

until dI UI S is displayed, press .

until desired display division size is displayed,

press .

8. This complete the Theoretical Calibration, press twice to exit setup menu or continue to Section 2.1.2.

By modifying the theoretical full scale, the sensitivity or divisions, the weight (span) calibration is cancelled and the theoretical calibration only is considered valid.

If the theoretical full scale and the recalculated full scale in weight (span) calibration (see Section 2.1.5) are equal, this means that the calibration currently in use is theoretical; 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.).

2.1.2 Maximum Capacity (NASS )

Maximum capacity (live load/product) that can be displayed. When the weight

exceeds this value by 9 divisions the following is displayed ‘ overload. To disable this function, set to 0.

------

’, indicating

1. Press and hold , then press . CALIb will be displayed.

14 SCT Weight Transmitter Operator’s Manual

+ 40 hidden pages

Rice Lake SCT-10 User Manual

Contents

1.0 Introduction

1.1 Safety

1.1.1 Safety Symbol Definitions:

1.1.2 Safety Precautions

1.1.3 Equipment Recommendations

1.1.4 Correct Installation Of Weighing Instruments

1.1.5 Correct Installation Of The Load Cells

1.2 Load Cells

1.2.1 Load Cell Input Test (Quick Access)

1.2.2 Load Cell Testing

1.3 Specifications

1.4 Electrical Connections

1.5 LED and Key Functions

1.6 Instrument Commissioning

1.6.1 If The Instrument Has Not Been Calibrated

2.0 Configuration

2.1 Calibration

2.1.1 Theoretical Calibration

2.1.2 Maximum Capacity (NASS )