Table of Contents
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1
I N S T R U C T I O N S
FOR
THE INSTALLATION AND THE USE
OF THE
L
C
OAD
ELL
Mod.
S/N
For series: 500QD- 560QDT – QB700 –LD – LT – HC 2000 – BC 300 - MD 5000 –
MB 400 – MR 400 – AP 7000 – ME – MF – 942 (Liftsentry) – 922
LCR 200 – EG – MB490- MP - PT500- KCI
DS Europe
Via F. Russoli, 6 - 20143 MILANO Tel. 0289.10.142 r.a
Manual N° 180909
Fax 02 89.12.48.48. –02 89.10.145
www.dseurope.com
e-mail:
dseurope@dseurope.com
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Table of Contents
Related Manuals for DS Europe 500QD Series
Summary of Contents for DS Europe 500QD Series
- Page 1 MB 400 – MR 400 – AP 7000 – ME – MF – 942 (Liftsentry) – 922 LCR 200 – EG – MB490- MP - PT500- KCI DS Europe Via F. Russoli, 6 - 20143 MILANO Tel. 0289.10.142 r.a Manual N° 180909 Fax 02 89.12.48.48.
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Page 2: Table Of Contents
NOTICE The information contained in this document is subject to change without notice. DS Europe shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. - Page 3 Year of mark’s apposition: 1997 The product has been tested in a typical configuration, as prescribed in product’s instruction manual. DS Europe srl declares that the overlisted product complies with the requirements of the EMC Directive over mentioned. DS Europe srl...
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Page 4: P R E L I M I N A R Y R E M A R K S
U.S.A. and Canada. DS Europe load cells have an high professional quality, they are robust and are designed for the best in safety and in reliability: the cautions and limitations listed in this manual want to suggest and to remember to the Customer the importance to avoid damages. -
Page 5: T E R M I N O L O G Y Of The Final Test Certificate
T E R M I N O L O G Y OF THE FINAL TEST CERTIFICATE REMARKS: The final test certificate is issued only in English. The various data are processed and printed directly by the computer, so without subsequent manipulation. - Page 6 CALIBRATION EQUIVALENT LOAD VALUE (= Calibration with external electronics): When yellow load cell conductor (black sheath cable) or grey conductor (grey sheat DIN47100 cable) with yellow conductor, or pin 5 with 2 of connector, the load cell provides an electrical signal that simulates a Kg load, applied onto the load cell, written on the load cell certificate.
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Page 7: Tests During Manufactuing
3) TESTS DURING MANUFACTUING Through in-process operations of the cells, at least, 5 operational tests are done, including also: the strain gauge bridge continuity, the insulation against the body of the cell and the stability of measure. When finished, the cells are submitted to several thermal and mechanical cycling; then, during the final test certification are controlled: the zero unbalance, the creep, the return to zero, the validity and the stability of the technical specifications. -
Page 8: Working Principle Of Load Cells
4) WORKING PRINCIPLE OF LOAD CELLS MEASURED FORCE: All the load cells (single - axis) measure the force only in the direction of their weighing axis (= measuring axis). The component vector-forces on other directions not only are not measured but they can deform the cell, they introduce supplementary errors and they can destroy it. -
Page 9: Cautions For Installation And Use Of Load Cells
For risky uses, during the negotiations or before the installation of the cell or when known, it is obligatory for the Purchaser and for the User to supply this information so that DS Europe can renounce to the order and to the delivery of the goods or to give, under the full responsibility of the User, instructions to reduce or to cancel the risks. - Page 10 5.2.3 Use of the cells under shocks, bumps and vibrations: Under shocks, bumps and vibrations the applied force is always the product of the mass applied to the cell multiplied by the acceleration (F = ma) and the cell is easily loaded over the max acceptable limit and it could break.
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Page 11: Mechanical Installation Of Load Cells
• Small measuring ranges (especially the 2-3-6Kg): it is necessary not to apply overloads, not only during the normal load cell use but also during handling and mechanical installation. All these accessories have to be scaled and made by the Customer, in relation to the applications and the standards imposed. - Page 12 6.1.7 Load cells are to be installed in application machines where there are relatively low vibrations (=mechanical noise) that might reduce the measured resolution. Load cells are to be fixed to machine parts that are not linked, to anything else, by stiff links (like tubes and cables) that might introduce hysteresis in the measure.
- Page 13 The body of the cell can rotate, about ±10 degrees, on its axis. Before the final clamping of the screws of the lid rotate the measuring body so to obtain the maximum electrical signal output from the cell: this maximum value means the coincidence of the weighing and of the measuring axes.
- Page 14 Both the blocks have to be welded to the structure. They are made by the User or supplied by DS Europe. Mod. LD: Force to be measured is to be evenly shared on the top spherical surface of the centering pin.
- Page 15 PANS, PLANES AND STRUCTURES OF WEIGHING (see paragraph 4.2.1): Cells with pan directly connected and solid with the load cell (i.e.: QB 700 and EG): The pan has to be very stiff. Flexions of about 1 mm at the edges may reduce even 10 times the measure accuracy. To avoid increase of weight of the pan: bending beads or the use of aluminium die- casting pans are suggested.
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Page 16: Electrical Connections Of Not Amplified Load Cells
7) ELECTRICAL CONNECTIONS OF NOT AMPLIFIED LOAD CELLS CABLE OR CONNECTOR? For outdoor applications and for all the industrial environments, the cable connection is preferable. The mating connector, even if sealed, has always inside dead volumes with air and the air, due to the thermal variations, exchanges humidity which, in long periods, brings oxidations on the electrical contacts, electrical jumpers of moist dust acting directly on the strain-gauge bridge and, consequently, introducing shifts of the zero and instability of the measure. - Page 17 Exceptions are the button cells models BC 301 – BC 302 – BC 303. Due to their extreme compactness and its poor thermal dissipation capability, it is advisable an excitation voltage from 1 to 5 Volts. To increase the thermal dissipation: bond the cell at the base by conductive cement and, by conductive silicon grease, fill the air gap between the upper surface of the cell (=...
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Page 18: Electrical Connection Of Amplified Load Cells
8) ELECTRICAL CONNECTION OF AMPLIFIED LOAD CELLS FOREWORD 8.1.1. Series 500 QD; 560QDT; LD; LT; AP 7000 (from 10 up to 100tons FS), PT500, EG, MD5000 and MP can be made with built-in amplifier electronics. Series AP 7000 is usually made with built-in analog amplifier electronics (models from 250Kg up to 5ton FS are miniaturized and do not have enough room inside for housing the amplifier electronics). - Page 19 Advantages: - The Voltage stabiliser, inside the cell, keep insensible the excitation of the cell to the voltage drops due to the length and to temperature changes of the connection-cable. With power voltages around 15 Vdc, distances cell/electronics of several kilometres are acceptable! - The internal amplifier and the high voltage output (±...
- Page 20 + Signal ZERO AND GAIN REGULATIONS: 8.4.1 Important: the gain (= span) regulation is done at the final test by DS Europe and it cannot be regulated by the Customer. A regulation of it changes the values of sensitivity and of calibration listed on the "final test certificate"...
- Page 21 The gain regulation is the most internal one and far from the external enclosure and difficult to be reached. This regulation is done by DS Europe and it has not to be touched by the Customer.
- Page 22 WORKING AREA OF THE CURRENT AMPLIFIER -A4: (2 -wires): NOTE: see the diagram of the "Pressure transducer" valid also for the current amplifier -A4 of the load cells. 8.6.1 The diagram states the relation between the Power supply voltage: V ps of the cell (=abscissa) and the load resistor value: RL (= ordinate).
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Page 24: Electrical Connections Of Digital Load Cells
9) ELECTRICAL CONNECTIONS OF DIGITAL LOAD CELLS Load cells with built-in CAN Open output DS406 profile CAN Open Micro connector 5 pins (M12 CAN_V+ CAN_GND CAN_L CAN_H Load cells with built-in RS422 output RS422 Gray sheath DIN47100 cable Connector White + Power supply Brown - Power supply... -
Page 25: Protection Against Electrical Noise
10) PROTECTION AGAINST ELECTRICAL NOISE 10.1 The signal outputs from the load cells are always low and they may be seriously spoilt by the external electrical disturbances. The main cares to be taken are the following: 10.2 For the connection cell-signal conditioner always use cable with braiding shield 100%. The cell and the cable have to be set up far from electric motors, power switches, etc. -
Page 26: Environment Protection
11.2 CELLS FOR OUTDOOR APPLICATIONS: Common features of nearly all DS Europe load cells (excluded la Series QB 700, EG, MP, 942 e BC 300) are the great protection for industrial purpose and for outdoor applications. -
Page 27: Tests For The Application Of The Ce Mark
12) TESTS FOR THE APPLICATION OF THE CE MARK 12.2 AMPLIFIED TRANSDUCER: They are subjected to CE mark. Those one without internal amplifier are considered “passive components” and therefore any certification is necessary. 12.2 TEST CENTER AND LIST OF THE TESTS: The tests have been done at a Test Centre “competent body”... -
Page 28: Controls And Life Of A Load Cell
13) CONTROLS AND LIFE OF A LOAD CELL 13.1 STARTING PERIOD: During the first months from the cell construction, are discharged the superficial stresses due to the machining and the stresses included in the cements; they follow possible little variations of zero and sensitivity. For laboratory precise tests, it is advisable a control and a calibration after the first 6 months of life of the cell and, further, every year period. -
Page 29: Possible Damages That Might Happen To A Load Cell
14) POSSIBLE DAMAGES THAT MIGHT HAPPEN TO A LOAD CELL A load cell can rarely be repaired and the repair is almost always more expensive than the replacement of a new cell, in that disassembly means destruction of parts and repair with subsequent control carried out by specialist staff outside the production cycle. - Page 30 14.3 POOR INSULATION AGAINST THE BODY OF THE CELL: Problem: excessive zero-drift, notable instability of the zero, insulation below one Mohm. Causes: water penetration, persistent high humidity in the cell, electrical discharges between the electrical circuit and the body of the cell. Solution: if the cause is the penetration of water, it is recommended to bake the cell in an oven at 85°C for at least 10 days, hoping that no conductive residue will remain;...
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Page 31: S A L E S C O N D I T I O N
B) RESPONSABILITY FOR DAMAGES: DS Europe products are only parts of more complex machineries and of plants sold in thousands of pieces/year, for thousands of different applications with different local standards and specifications unknown to the Supplier.
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