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ELECTRONIC WEIGHING TERMINAL
Technology and reliability that carries weight
ELECTRONIC WEIGHT INDICATOR
MODEL LD5204-06
TECHNICAL MANUAL
HEAD OFFICE:
41, Arkadias Str, 11527 Athens, GREECE
Tel: +30 1 7770 936, 7702998, Fax: 7758925
THE NETHERLANDS (International Operations):
Paardeweide 11A, 4824 EH Breda, The Netherlands
Tel: +31 76 543 05 01, Fax: +31 76 543 05 02
Email address: tsc-breda@scalecompany.com
9 If you have any questions…
Email address: leon@leon-engineering.com
9 If you want to visit us…
http://www.leon-engineering.com
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LD5204-06 WEIGHT INDICATOR - TECHNICAL MANUAL
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Technology and reliability that carries weight
PAGE
1 INTRODUCTION .........................................................................................................................................3
2 INSTALLATION ..........................................................................................................................................4
2.1 Mounting ................................................................................................................................................4
TABLE OF CONTENTS
ANNEX A containing installation schematic drawings and connector pin outs comprises of 12 pages.
This manual contains proprietary information, protected by international copyright laws. No part of this
document maybe reproduced without the written agreement of the publisher, LEON ENGINEERING.
The information herein is believed to be both accurate and reliable. LEON ENGINEERING, however, would
be obliged to be informed if any errors occur. LEON ENGINEERING cannot accept any liability for direct or
indirect damages resulting from the use of this manual.
LEON ENGINEERING reserves the right to revise this manual and alter its content without notification at any
time.
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Technology and reliability that carries weight
1 INTRODUCTION
The electronic weight indicator model LD 5204-06 series is a compact microcontroller based unit specifically
designed for use on systems utilizing strain gauge load cells.
The standard configuration includes:
1.
High accuracy analog to digital converter (max 550.000 internal counts).
2.
Front panel with 6 digits, 7 segment, LED red (20 mm) plus 8 annunciators (LD 5204)
or 6 digits,7 segments, LCD display black (16 mm) plus 5 annunciators (LD 5206)
8 membrane keys with tactile feedback.
3.
Non volatile memory for system parameters and calibration data.
4.
Non volatile memory for storage of 10.000 weights (Electronic tally roll or Alibi memory).
5.
Serial port RS232C adapter for printing weighing data on a serial printer or host computer.
6.
2 setpoints 24VDC/100mA optoisolated and 1 optoisolated input.
7.
The microcontroller technology allows the instrument to perform in software all measuring
functions, operator input-output, automatic controls and sequences necessary for the operation
of weighing systems.
8.
The setting of the unit is done through a guided keyboard operation, enabling the adaptation
to operating environment and system requirements.
9.
A totaliser and counter is available that may be viewed or printed.
10.
Several print formats are available selectable in setup.
11.
A piece count facility is also offered with selectable sample size is included in the standard software.
OPTIONS
a.
RS485 serial port adapter for bi-directional communication with a host computer.
b.
2 nd analog load cell input board (PCB765).
c.
Analogue output 0/4 - 20mA or 0-10V, 16 bits resolution. (PCB 761) remotely powered.
EXTENT OF SUPPLY
A.
The standard supply includes:
- The connection plug for the load cell cable and peripherals.
- 230VAC to 9VDC/700mA, mains power adapter.
- User manual.
B.
Prior to unpacking the equipment, examine the carton for exterior shipping damage and if any notify
the carrier immediately.
Remove the equipment from the carton and plastic bag.
Inspect extent of supply for any sign of damage.
Save packaging material.
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Technology and reliability that carries weight
2
INSTALLATION
2.1 Mounting
The mounting location must be such that the instrument is not subject to excessive vibrations, heat or humidity.
Avoid direct sunlight on the front of the instrument. The unit has to be installed at the right height to allow an
easy reading of the display and keyboard operation.
2.2 Wiring
Use load cell cable 6 x 0,5 mm 2 shielded for the sensor. Use 3 x 0,34 mm 2 shielded for RS232C connection
and 2x0,34 mm 2 twisted pair and shielded for RS485 connection. .
Table top
All connections to the instrument are made through the rear panel connectors. Strain reliefs are supplied with the
connectors. The shield should be connected to the metal frame of the connector.
Stainless steel
-Remove the rear panel and lift it carefully.
-Insert cables via the cable glands. Strip and connect cables according to connector diagram in Annex A.
-Connect the shields of the cables between the plastic part and metal case of cable glands or on screws supporting
the pcb’s.
-Re-install the rear panel.
2.3 Power
The instrument is powered from external power supply (9-15VDC/500mA) or battery.
As the instrument is computer controlled it requires clean power for reliable operation.
Power supplied should come from a source that is isolated from other process equipment.
A main adapter 9VDC/500mA is recommended for operation.
2.4 Load cells
CONNECTION :
Connect according to the junction box drawing.
MAX. CABLE :
300m/ cross sectional area of cable (mm 2 ).
UTILISATION :
A -0.25 to 2.0 mV/V range is permitted (dead load inclusive) with
GAIN=10mV or a -0.25 to 4.0 mV/V is permitted with GAIN=20mV.
The load cells must be chosen so that the input signal to the controller is at
least 0,4μV per scale increment. For load cell output less than 0,4μV/digit
the controller will still be stable but the full temperature range accuracy is not
guaranteed.
CONVERSION :
This parameter allows the user to adjust internal speed of the A/D converter.
RATE
It is normally set to 14 for static weighing applications or to 57 for dynamic weighing
applications.
LOAD CELL :
5VDC, fixed or alternating polarity (Setup selectable) for 10 load cells of 350 OHM
CAUTION : Do not run signal cables together with power cables. Connect the shielding
where indicated on the drawing only. Never use a megger to check wiring.
Never use plastic insulating tape on load cell connections.
Be sure the AC power socket outlet is properly protected. For optimum EMC performance,
keep the length of shield inside the enclosure as short as possible.
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Technology and reliability that carries weight
3
SPECIFICATIONS
3.1 Environmental And Electrical Considerations
AMBIENT
:
Storage - 10 to +70 0 C.
TEMPERATURE
Operating -10 to +40 0 C.
HUMIDITY
:
40 to 90% RH (non condensing).
VIBRATION
:
Severe vibration can affect the accuracy of weighing and damage
electric / electronic components.
AIR
:
The surrounding air should be dust free and not contain any corrosive
gasses or materials which could adversely affect the equipment.
PROTECTION
:
IP40 for table top or IP65 for stainless steel.
ELECTROMAGNETIC :
Heavy electrical equipment should not be installed close to
FIELDS
the weighing equipment.
INCOMING AND
:
Relays and contactors connected to the equipment must have
OUTGOING SIGNALS
reliable and effective interference suppression. This also applies to other
equipment located within a distance of 3m from out equipment. Cabling
must be performed according to normal practice.
NOTES
:
-WELDING on or in the vicinity of the equipment is strictly prohibited.
-STATIC loads, caused by thunderstorms, have to be prevented from
developing by use of reliable lightning conductors.
-ENSURE that the cooling of the equipment is not obstructed.
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