Rice Lake 30 Series Guide de l'administrateur

SCT Weight Transmitter

30 Series

Installation & Operator’s Manual

159585

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.

Contents

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

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

1.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4 Analog Output Type Selection . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5 Instrument Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.0 Calibration ................................................................................ 9

2.1 Real Calibration (With Sample Weights) . . . . . . . . . . . . . . . . . 9

2.2 Theoretical Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3 Digital Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.0 RS-485 Serial Connection ...................................................... 11

3.1 Continuous One Way Transmission Protocol . . . . . . . . . . . . 11

3.2 Modbus-RTU Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.0 Reserved for the Installer ....................................................... 14

4.1 Restoring Factory Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2 Calibration and RS-485 Port Setting Access Limitation . . . . 14

Specifications subject to change without notice.

Rice Lake Weighing Systems is an ISO 9001 registered company.

December 05, 2013

ii SCT-30 Weight Transmitter 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.

Introduction 1

1.0 Introduction

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

Failure to heed may result in serious injury or death.

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.

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.

WARNING

Important

WARNING

2SCT-30 Weight Transmitter Manual

1.1.3 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.

1.1.4 Correct Installation of Weighing Instruments

• The terminals indicated on the instrument’s wiring diagram to be connected to

ground 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 meters with AWG24, shielded and twisted cables

- Analog current output: up to 500 meters with 0.5 mm2cable

- Analog current output: up to 300 meters with 0.5 mm2cable

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 waterproof 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).

Important

Introduction 3

Connecting Several Cells in Parallel:

Connect several load cells in parallel by using, if necessary, a watertight junction box

with a terminal box. The load cell connection extension cables must be shielded,

placed 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 4 x 1 sq.mm minimum

cross-section).

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 stability of the support structure.

Grounding The Weighed Structure:

By means of a 10 AWG 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 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).

Figure 1-1. Installation Recommendations

Uses ground plate

to continue ground.

Uses structure to continue ground.

4SCT-30 Weight Transmitter Manual

1.1.6 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 (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.

1.2 Specifications

• Analog/serial weight transmitter suitable for assembly on back panel fitted

Omega/DIN rail. Dimensions: 90x93x65 mm.

• Current or voltage 16 bit analog output.

• RS-485 serial output with Modbus RTU or continuous transmission protocol.

• Zero and full scale setting.

• Simultaneous display of the load cell reading in mV and of the analog output

reading.

• Operating mode selection via 3-position selector switch, DIP switches, knob

control and 2 line, 8 column alphanumeric display.

Important

ANALOG OUTPUT

(Current and Voltage)

PLC

MAX 8 LOAD CELLS IN

PARALLEL

RS-485

Modbus RTU

SERIAL PORT

DC power

supplier

(12-24 Volt )

Introduction 5

Power Supply And Consumption (VDC) 12 - 24 VDC ±10% ; 5 W

No. of Load Cells in Parallel and Supply max 8 ( 350 ohm ) ; 5VDC/120mA

Linearity / Analog Output Linearity < 0.01% F.S. ; < 0.01% F.S.

Thermal Drift / Analog Output Thermal

Drift

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

A/D Converter 24 bit (16.000.000 points)

RS-485 Max Divisions ± 200000 (±10 mV with sens. 2 mV/V)

± 300000 (±15 mV with sens. 3 mV/V)

Measurement Range ±39 mV

Max Sensitivity Of Usable Load Cells ±7 mV/V

Max Conversions Per Second 300 conversions/second

Digital Filter / Readings Per Second 0.003 - 4 sec / 10 - 300 Hz

Serial Ports RS-485

Baud Rate 2400, 4800, 9600, 19200, 38400,

115200

Humidity (Non Condensing) 85%

Storage Temperature - 30°C + 80°C

Operating Temperature - 20°C + 60°C

Analog Output 16 Bit - 65535 Divisions Current (max 400 ohms)

0-20 mA; 4-20 mA

Voltage (min 2 kohm)

0-10 V; 0-5 V; ±10 V ±5 V

Table 1-1. Technical Specifications

6SCT-30 Weight Transmitter Manual

1.3 Electrical Connections

• It is recommended that the negative side of the power supply be grounded.

• It is possible to power up to eight 350 ohm 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.

Figure 1-2. Wiring Diagram

SCT-30

1312345678 9 11 1210 14 15 16

LOAD CELLS IN PARALLEL(1-16 terminals)

+ EX

-EX

-SIG

+ SIG

+ EX

-EX

-SIG

+ SIG

+ EX

-EX

-SIG

+ SIG

MODE FILTER

DIP-SW

MODIFY

and

CONFIRM

23222018 19 2117

+12-24

POWER

VDC

VmACOM

RS485

ZERO

NORMAL

FS CAL

123

YELLOW

GREEN

RED

EXCITATION -

EXCITATION +

SIGNAL -

SIGNAL +

EXCITATION -

EXCITATION +

SIGNAL -

SIGNAL +

EXCITATION -

EXCITATION +

SIGNAL -

SIGNAL +

EXCITATION -

EXCITATION +

SIGNAL -

SIGNAL +

Current output: max load 400 ohm

Voltage output: min load 2 kohm

++ +

RS485

ANALOG

OUTPUT

12/24 Vdc

SUPPLY

+ SUPPLY

- SUPPLY

1: Selector switch 2: Knob control 3: DIP switch

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