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Omega DPS20 Series User Manual

Panel meter for load cell signals 6-digit, 1⁄8 din panel mount
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User's Guide
TM
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omega.com
e-mail: info@omega.com
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www.omegamanual.info
DPS20 Series
Panel Meter for
Load cell signals
⁄
6-Digit,
DIN Panel Mount
1
8

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  • Page 1 User’s Guide Shop online at omega.com e-mail: info@omega.com For latest product manuals: www.omegamanual.info DPS20 Series Panel Meter for Load cell signals ⁄ 6-Digit, DIN Panel Mount...
  • Page 2 Fax: (203) 359-7700 e-mail: info@omega.com For Other Locations Visit omega.com/worldwide The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.
  • Page 3 Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification.
  • Page 4 DPS20 Load cell panel meter and controller Instruction Manual 1. Panel meter DPS20 Panel meter for load cells, size 96 mm (1/8 DIN)       Digital panel meter, with 96 x 48 mm (1/8 DIN) size and 6 minals. For industrial applications. digits with 14 mm digit height, for load cell signals.
  • Page 5 DPS20 Load cell panel meter and controller Instruction Manual 1.2 Index 1. Panel meter DPS20 ....4 1.13 Full configuration menu... .25 1.1 How to use this manual .
  • Page 6 Table 1 - Meaning for the front leds ‘A’ and ‘B’ 1.5 Additional information 1.7 Rear view Option 3 Option 1 Option 2 You can find more information at www.omega.com website. 1 2 3 4 5 6 7 8 9 0 Signal Power (see section 1.8)
  • Page 7 DPS20 Load cell panel meter and controller Instruction Manual 1.8 Signal and power connections 1 2 3 4 5 6 7 8 9 0 Vexc+ Sense+ Neutral AC / Negative DC Signal+ Not connected Signal- Phase AC / Positive DC Sense- Figure 3 - Power connections Vexc-...
  • Page 8 DPS20 Load cell panel meter and controller Instruction Manual 1.9 Technical specifications Digits step response see Table 2 number of digits 0 % to 99 % signal 7 segments signal terminals plug-in screw terminals (pitch 3.81  m m) color red or green Power digit height 14 mm...
  • Page 9 DPS20 Load cell panel meter and controller Instruction Manual 1.9 Technical data (cont.) 1.9.4 Mechanical dimensions (mm (in)) 1.9.2 Signal ranges The instrument works with 6 internal signal ranges and the active range is automatically selected when the in- strument is started. The selection depends on the value of the two parameters : ‘Sensitivity’...
  • Page 10 DPS20 Load cell panel meter and controller Instruction Manual 1.10 Included functions 1.11 ‘Tare’ functions included Activate the tare function to force the instrument to take the Included functions Section actual signal as a ‘0’ weight. The tare function does not mod- ify the internal calibration of the cell, and can be activated as Function tare 1.11...
  • Page 11 DPS20 Load cell panel meter and controller Instruction Manual 1.12 Configuration 1.12.1 How to operate the menus The instrument has two menus accessible to the user : leaves from the configuration menu. Then changes are ap- plied and the instrument is back to normal function. When ‘Configuration menu’...
  • Page 12 DPS20 Load cell panel meter and controller Instruction Manual 1.12.2 Initial set-up Before starting to configure the instrument, identify the pa- correct the individual deviations of this particular load cell. rameters of the load cell, at the manufacturers datasheet (see For the empirical configuration you will need access to two Table 5).
  • Page 13 DPS20 Load cell panel meter and controller Instruction Manual 1.12.3 Initial setup menu At the initial set up of the instrument, first configure the Press ‘SQ’ (<) for 1 second to access the ‘con- figuration menu’. For a description on how to op- theoretical part of the load cell at the ‘Load cell param- eters’...
  • Page 14 DPS20 Load cell panel meter and controller Instruction Manual 1.12.4 Function ‘auto-tare’ 1.12.6 Function ‘stock’ The ‘auto-tare’ function automatically activates the ‘tare’ The ‘Stock units’ (‘Stck’) function is provided to count large when the weight is removed from the load cell. The ‘auto- quantities of small units, in situations such as stock invento- tare’...
  • Page 15 DPS20 Load cell panel meter and controller Instruction Manual 1.12.7 Advanced configuration menu At the ‘Auto-tare’ (‘Aut.t’) menu configure the activation val- ue and stability values to control the automatic activation of the tare, when weight is removed from the cell. See section Advanced conf.
  • Page 16 DPS20 Load cell panel meter and controller Instruction Manual 1.12.8 Alarms The instrument manages 3 independent internal alarms, each Reading one controlling the activation of an optional relay, transistor setpoint or SSR control output. These outputs are optional (see section hysteresis 2) and are installed at the free slots of the instrument (see section 1.18).
  • Page 17 DPS20 Load cell panel meter and controller Instruction Manual 1.12.9 Alarm configuration Alarms 1, 2 and 3 are configured from menu ‘ALr1’, ‘ALr2’ or ‘ALr3’. See section 1.12.8 for additional information. Alarms • at the ‘Active’ (‘Act’) parameter select ‘on’ •...
  • Page 18 DPS20 Load cell panel meter and controller Instruction Manual 1.12.10 Display filters The instrument provides several functions to act upon the reading in order to increase stability, reduce noise and adapt to particular needs. These functions are grouped under the Display Fixed digits Fix digits...
  • Page 19 DPS20 Load cell panel meter and controller Instruction Manual 1.12.11 Rear controls The instrument provides a digital ‘on/off’ input at the rear terminals, referenced as ‘EK’ (see section 1.8). Assign func- tions to this terminal and activate these functions with a short Tare Rear controls circuit between terminal ‘EK’...
  • Page 20 DPS20 Load cell panel meter and controller Instruction Manual 1.12.13 Fast access The ‘fast access’ is an operator configurable menu. When • access to maximum and minimum memories from the configured, the operator can access the most usual functions front key ‘UP’ (5) allows to visualize the values. To reset the with a single press of the front key ‘UP’...
  • Page 21 DPS20 Load cell panel meter and controller Instruction Manual 1.12.15 ‘Fast access’ configuration menu At the ‘Key UP (‘fast access’)’ (‘K.uP’) menu configure which functions and parameters will be accessible through the ‘fast access’ menu. Select ‘on’ to activate each function. See sec- Key UP Setpoint 1 (‘Fast access’)
  • Page 22 DPS20 Load cell panel meter and controller Instruction Manual 1.12.17 Tools The ‘Tools’ (‘tooL’) menu groups functions with a variety of uses. at the ‘Password’ (‘PASS’) function define a 6 digit code to Tools Password • block access to the ‘configuration menu’. Activate the pass- word to prevent access to the instrument configuration by non authorized personnel.
  • Page 23 DPS20 Load cell panel meter and controller Instruction Manual...
  • Page 24 DPS20 Load cell panel meter and controller Instruction Manual 1.13 Full configuration menu Press ‘SQ’ (<) for 1 second to access the ‘con- figuration menu’. Standard Mode 50 Hz Load cell Initial conf. 60 Hz Deci mal point parameters Nominal weight Sensitivity Alarms mV/V...
  • Page 25 DPS20 Load cell panel meter and controller Instruction Manual Display Fixed digits Fix digits Key LE Tare Alarm unlock Average filter 0 to 100 Stock units Steps Left zeros Key UP Setpoint 1 (fast access) Memory of Setpoint 2 maximum Setpoint 3 Memory of minimum Stock units Gross weight...
  • Page 26 DPS20 Load cell panel meter and controller Instruction Manual 1.14 Full configuration menu (cont) On power-up Delay Seconds Tare Tools Password Factory configuration Reset ‘initial conf.’ Version Minimum Brightness Standard Maximum Access to the optional module installed at slot 1 Option 1 Access to the optional module installed at slot 2 Option 2...
  • Page 27 DPS20 Load cell panel meter and controller Instruction Manual 1.14 Factory configuration 1.15 Messages and errors Initial configuration (‘InIt’) Error messages are informed flashing on display. Load cell parameters (‘cELL’) Decimal point (‘dP’) without (XXXXXX) Sensitivity mV/C (‘MV.V’) 2.0000 Messages and errors Nominal weight(‘LoAd’) 200000 ‘d.udr’...
  • Page 28 DPS20 Load cell panel meter and controller Instruction Manual 1.16 Practical cases 1.16.1 Normal case 1.16.3 Connections with a junction box Case for 1 load cell, powered from the instrument, with A ‘junction box’ for load cells has internal elec- power 10 Vdc, nominal weight 100 Kg and 2 mV/V sensi- tronics that can modify the ‘signal / weight’...
  • Page 29 DPS20 Load cell panel meter and controller Instruction Manual 1.16 Practical cases (cont.) 1.16.4 Connections with 3 or 4 load cells 1.16.5 Measuring mV at the laboratory Using 3 load cells is the optimal way to distribute the If you wish to configure the instrument to measure a mil- weight on a plane, although it is common to work with 4 livolt generated signal at the laboratory, there is a special load cells, in applications with tanks, hoppers and similar.
  • Page 30 DPS20 Load cell panel meter and controller Instruction Manual 1.17 To access the instrument To open the housing and access the internal circuits, use a flat screwdriver to unlock clips ‘D’, ‘C’, ‘B’ and ‘A’, in this order. Remove the front filter. Let the inside of the instru- ment slide out of the housing.
  • Page 31 Instruction Manual 1.19 Precautions on installation 1.21 CE declaration of conformity Product DPS20 Series Risk of electrical shock. Instrument terminals The manufacturer declares that the instruments indicated can be connected to dangerous voltage. comply with the directives and rules indicated below.
  • Page 32 DPS20 Load cell panel meter and controller Instruction Manual 2. Output and control modules 2.1 Módules R1, T1 and SSR The R1, T1 and SSR modules provides 1 relay output, 1 vation and deactivation delays, and a second setpoint to transistor output or 1 SSR drive output, to install in DPS20 create alarm windows.
  • Page 33 DPS20 Load cell panel meter and controller Instruction Manual 2.2 Module AO Module AO provides 1 analog output configurable as figured as an active loop (the instrument provides the 4/20 mA or 0/10 Vdc, to install in DPS20 digital panel me- excitation for the loop ) or as a passive loop (the loop is ters.
  • Page 34 DPS20 Load cell panel meter and controller Instruction Manual 2.2.1 Configuration menu Configure at menu ‘Mode’ (‘ModE’) the output signal range to Mode 4/20 mA ‘4/20 mA’ (‘mA’) or ‘0/10 Vdc‘ (‘Vdc’). Position for jumpers ‘V’ and Mode Mode 0/10 Vdc ‘M’ must be according to the range selected. At menu ‘Scaling’...
  • Page 35 DPS20 Load cell panel meter and controller Instruction Manual 2.3 Module RTU Module RTU provides 1 Modbus RTU communications configuration menu (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’ depending port, to install in DPS20 digital panel meters. Enables pro- on the position the module is installed). tocol function ‘4’...
  • Page 36 DPS20 Load cell panel meter and controller Instruction Manual 2.3.2 Configuration menu Configure at menu ‘Configuration’ (‘rtu’), the address val- ue between ‘1’ and ‘247’ at parameter ‘Address’ (‘Addr’), 1 to 247 bus speed in kbps at parameter ‘Speed’ (‘bAud’) and data Configuration Address format at parameter ‘Format’...
  • Page 37 DPS20 Load cell panel meter and controller Instruction Manual 2.3.4 Description for Modbus RTU registers Register R0 and R1 (DISPLAY1_L and DISPLAY1_H) Example - same example as in R0 and R1 but accessing to R5 and R6. Contains the display value of the instrument, codified in two registers of 16 bits each.
  • Page 38 DPS20 Load cell panel meter and controller Instruction Manual 2.4 Module S4 Module S4 provides 1 RS-485 ASCII communications port, pad of the meter, by setting the parameters at the options to install in DPS20 digital panel meters. ASCII protocol with configuration menu (‘Opt.1’, ‘Opt.2’...
  • Page 39 DPS20 Load cell panel meter and controller Instruction Manual 2.4.2 Configuration menu At menu ‘Configuration ASCII’ (‘AScI’), configure the instrument at parameter ‘Mode’ (‘ModE’) to work as ‘slave’ or ‘master’, at param- eter ‘Address’ (‘Addr’) set the address value from ‘1’ to ‘31’, set the ‘Slave’...
  • Page 40 DPS20 Load cell panel meter and controller Instruction Manual 2.4.4 Frame types The ASCII protocol defines the following frames: • Frame ‘error’ (‘ERR’). Id code 38. Response frame to a request data frame. Indicates that an error has occurred. Error code is codified •...
  • Page 41 DPS20 Load cell panel meter and controller Instruction Manual 2.4.7 Frame examples Frames ‘RD’ (36) and ‘ANS’ (37) Example - ‘Master’ (address ‘0’) requests the value of register ‘0’ (dis- *Instruments with 4 digits also send reading values formatted with 6 play value) to the ‘Slave’...
  • Page 42 DPS20 Load cell panel meter and controller Instruction Manual 2.5 Module S2 Module S2 provides 1 RS-232 ASCII communications port, to install in DPS20 digital panel meters. Protocol specifications are the same as with module S4 (see section 2.4), with only difference that the physical bus is RS-232 instead of RS-485.
  • Page 43 DPS20 Load cell panel meter and controller Instruction Manual...
  • Page 44 DPS20 Load cell panel meter and controller Instruction Manual 3. How to open and close 3.1 How to open the housing A. Locate the clips Locate the 4 clips (A B C D). Clips are covered by the front filter. Clips can be seen when looking from the rear of the instrument, just below the front filter.
  • Page 45 DPS20 Load cell panel meter and controller Instruction Manual 3.2 How to close the housing A. Locate the clips Locate the 4 clips (A B C D) at the housing (image A.1) and the 4 matting clips at the filter (image A.2). With the instrument inside the housing, face the front filter against the housing (do not clip yet).
  • Page 46 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at omega.com TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors...