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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

+ Power supply

White

- Power supply

Brown

+ RXD

Green

- RXD

Yellow

+ TXD

Grey

- TXD

Pink

Load cells with built-in RS485 output

RS485

Gray sheath DIN47100 cable

Connector

+ Power supply

White

- Power supply

Brown

+ Data

Green+Grey

3+5

- Data

Pink

4+6

Содержание 500QD Series

Страница 1: ...ies 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 ...

Страница 2: ...CTION AGAINST ELECTRICAL NOISE 25 11 ENVIRONMENT PROTECTION 26 12 TESTS FOR THE APPLICATION OF THE CE MARK 27 13 CONTROLS AND LIFE OF A LOAD CELL 28 14 POSSIBLE DAMAGES THAT MIGHT HAPPEN TO A LOAD CELL 29 S A L E S C O N D I T I O N 31 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...

Страница 3: ... DS Europe srl Address via F Russoli 6 Milano Italy Type of product Amplified strain gauge transducers Models 500QD 560QDT QB700 LD LT HC 2000 BC 300 MD 5000MB 400 MR 400 AP 7000 ME MF 942 Liftsentry LCR 200 EG MB490 MP PT500 KCI 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 overli...

Страница 4: ...nform immediately the Supplier so that he may suggest safety solutions or he may refuse the order and the supply 1 3 The load cells are only elements of machineries or plants they are sold in thousands pieces year for disparate applications having them to satisfy different specifications and standards unknown to the Supplier Under these circumstances DS Europe is compelled to refuse any responsibi...

Страница 5: ...rloads with static and dynamic forces well aligned along the load cell measuring axis Non linearity and all load cell technical specifications are to be calculated as a percentage onto the load cell rated capacity and not onto the applied force that might be much lower compared to the full scale Resolution of the measured value on electronics display is depending on the ration between measured val...

Страница 6: ...easured signal therefore after calibration it might be needed to reverse the connection of the load cell signal conductors example green with white conductors in order to get a positive electrical signal The procedure for calibrating the electronic weighing system is as follows Introduce the calibration signal Adjust the span gain of the signal conditioner until the digital display shows the calib...

Страница 7: ...ral 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 Periodically samples taken from production are submitted to a full cycle of tests in order to verify conformity of the production to product s specifications For the over listed all the cells are de...

Страница 8: ... the measure quality 4 2 DISTANCE BETWEEN THE FORCE AND THE WEIGHING AXES The force to be measured is to be aligned along the load cell measuring axis but for some load cell series it is enough to be parallel therefore there are four types of load cells 4 2 2 4 2 1 Series QB 700 Series 500 QD Series EG for scales with a flexing parallelogram The point of application of the force can be far from th...

Страница 9: ...e protections etc are made by metal blocks complete of distance regulation They are low cost components manufactured directly by the Customer The free play is regulated for an action around 20 over the FS 5 2 2 Tension load cells The use in tension is usually risky especially for hanging loads They need the best care to avoid damages In order of priority for tension applications can be used the Se...

Страница 10: ...les of load cells FS are to be chosen in order to be equal or greater than 100 of the force to be measured Select a cell more suitable to accept overload i e prefer the Series AP 7000 on contrary the Series LT BC 301 BC 305 are only for strictly static measures Insert overload and stopping blocks as listed in paragraph 5 2 2 Each block has to bear loads at least 10 times the full scale of the cell...

Страница 11: ...asured that can be much smaller In case more than one load cell is used in the same machine application then a combined error is to be considered too The main installation cares to be taken are the following 6 1 1 Fixing base in high strength steel with thickness at least 1 5 times that of the cell 6 1 2 Contact surface flat and finely machined and clean 6 1 4 Very important Strong and even clampi...

Страница 12: ...nical fixing 5 is the maximum allowed misalignment The top and bottom contact surfaces are to be clean and well machined Load cell is not to move from its fixing position because of vibrations and side forces it might be necessary to eventually install load cell onto a housing for the load cell bottom side This load cell housing is to have a 0 3mm larger diameter compared to the bottom of load cel...

Страница 13: ...incide with the pin axis without any transversal component of the applied force External circular bearer The support and the fixing have to be limited only to the external circular crown without extending to the internal area of the cell The setting can be done in several ways by epoxy cements or by a housing without cement Housing by a hollow with diameter 0 3 0 6 mm larger than the cell Importan...

Страница 14: ...le adapter Mod AP7000 The elongated load cell metal frame means that load cell can be influenced by side forces and off center loads All side or off centre loads can produce dangerous situations because of concentrated mechanical strains that might yeld the load cell metal frame as well as break it With compression forces it is necessary to completely fix the load cell threads up to the ledge in o...

Страница 15: ...ragraph 4 2 1 The distance among the cells brings to the solution of the following installation problems Important with several cell systems use only not amplified load cells see par 8 1 2 6 4 1 The radial movement between the upper structure of the cell and the lower one due to the difference of the thermal and mechanical expansion of the two structures this problem is usually limited as the uppe...

Страница 16: ...ck Power supply Red Yellow 1 Red Red Signal White White 3 Colourless White Signal Green Green 2 Blu Green Calibration Yellow Grey 5 Calibration activation Yellow Green Grey Green 5 2 The screening sheath is not connected to the body of the cell 7 3 POWER SUPPLY OF LOAD CELLS WITHOUT BUILT IN ELECTRONICS The standard and recommended voltage is 5 or 10 V stabilized The cells can accept up to 15 V Th...

Страница 17: ...f these load cells have the built in calibration circuit In case cable color codes do not match the electronics connection codes it is recommended to consider valid the connection codes conductor colors and terminal numbers listed in the load cell final test certificate then what is listed in this manual and lastly what is listed in the technical bulletin par 1 5 7 6 SIGNAL CONDITIONER Are recomme...

Страница 18: ...not suggested as they are usually at different temperature conditions and the thermal drift of each amplifier and of each stabilizer even if low may add together in the summing unit 8 1 3 To satisfy the CE directives the amplified load cells have not the calibration lead 8 2 CHOICE OF THE INTERNAL AMPLIFIER Two categories of amplifiers are available of which are listed the advantages and the dis a...

Страница 19: ...oad resistance Advantages As for the voltage amplifiers A5 A1 Saving insignificant of a lead in the connecting cable Immunity to electrical noise on the cable and to drop of voltage due to cable resistance Disadvantages Low output signal from the strain gauge bridge very high amplifier gain and consequently high sensitivity to the electrical disturbances of the signal before amplification reduce t...

Страница 20: ...ith built in analog amplifier outputs 4 20mA Meaning Black sheath cable Grey sheath DIN47100 cable Connector Common Black Brown 4 Power supply Red Green 1 Signal Red Green 1 8 4 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 l...

Страница 21: ...dimensions of the bulletin when the cell is installed the cable exits on the left the two holes are vertically lined up on the right then the zero hole is in the upper position Do not touch the gain regulation on the lower position 8 5 3 Series ME MF The zero and gain regulations are reached removing the metal cover and the rubber gasket having unscrewed the 2 fixing screws Important remove only t...

Страница 22: ... working area area of Vps have to be 15 30 far from the left line minimum Vps allowed within the Area of Vps It is not convenient to exaggerate on the supply voltage Vps to avoid useless thermal dissipation inside the transducer Two explanatory examples 1 RL 250 ohms external load resistor Supply voltage Vps 15 V not sufficient 17 V just at the limit not advisable 20 24 V advisable 28 up to 41 V n...

Страница 23: ...23 ...

Страница 24: ...GND 3 CAN_L 5 CAN_H 4 Load cells with built in RS422 output RS422 Gray sheath DIN47100 cable Connector Power supply White 1 Power supply Brown 2 RXD Green 3 RXD Yellow 4 TXD Grey 5 TXD Pink 6 Load cells with built in RS485 output RS485 Gray sheath DIN47100 cable Connector Power supply White 1 Power supply Brown 2 Data Green Grey 3 5 Data Yellow Pink 4 6 ...

Страница 25: ...al insulating sheath to avoid to pick up the stray currents of the metal structures connected 10 4 When mating connectors are needed along the cable the shield has to go through a pin and not through the metal shell of the connector and the connector has to be insulated and covered by plastic tape 10 5 Avoid to use earth nets of industrial plants always rich of electrical disturbances but use sepa...

Страница 26: ...done filling the cell by silicon gels and rubbers which allows a tightness greater than that realized by weldings In fact in long periods the internal air dead volume on welded mechanics exchanges air and humidity through the cable never hermetically sealed even if clamped The Series LD is the most advisable for heavy and outdoor applications In these Series the strain gauges the electrical circui...

Страница 27: ... 80 MHz Test level 10 V 12 2 4 Normative reference ENV 50141 Port signal lines Test category Immunity Type of test RF common mode Frequency range 0 15 to 80 MHz Test level 10 V 12 2 5 Normative reference EN 61000 4 4 Port DC I O power port Test category Immunity Type of test Fast transient burst Common mode Test level 3 12 2 6 Normative reference EN 61000 4 4 Port signal lines Test category Immuni...

Страница 28: ...ation useless 13 2 CREEP On a cell loaded for a long period can appear creep of the metal body of the cements of the plastic backing of the gauges This creep is shown as a variation of the measure and unloading the cell as a non return to zero The variations are acceptable in industrial applications 13 3 LIFE OF A CELL FOR USE WITH RISKS OF DAMAGES See Chapter 5 After a maximum period of 5 years t...

Страница 29: ...ve the maximum accepted by the cell this damage occurs also when the cell is not electrically connected and by force transients shocks not shown in the digital display because of longer reading time Solutions a repair is not possible It is recommended to substitute the load cell and to apply an anti overload protection as well as a low friction force guiding system to protect the load cell 14 2 ST...

Страница 30: ...the repair is more expensive than the replacement by a new cell 14 4 DAMAGED ELECTRICAL CONNECTIONS Problem a highly fluctuating output signal especially if cable or connectors are moved or no signal at all Causes electrical connection cable or connector mechanically damaged by vibrations shocks bumping against sharp edges or by long term dynamic movements Solutions cable or connector is to be sub...

Страница 31: ... 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 For installations and for uses which directly or indirectly may involve risks of damage to Persons and things of damage for stopping of machineries o...

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