Lika LD25 Series User Manual
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Lika LD25 Series User Manual

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LD25x
User's manual
LD250 - LD251 - LD252 - LD253
Description
LD25x is a SSI display for connecting single-turn or multi-turn SSI encoders. The
user's interface is a multi-function keyboard fitted with 3 keys and a 7-segment
and 6-digit LED display.
Model LD250 is a SSI display only version; model LD251 provides an analogue
output in addition; model LD252 further offers two presets and two switching
outputs; finally model LD253 is equipped with a RS-232/RS-485 serial interface
for connection with a PC.

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  • Page 1: Table Of Contents

    LD25x User's manual LD250 – LD251 – LD252 - LD253 Description LD25x is a SSI display for connecting single-turn or multi-turn SSI encoders. The user's interface is a multi-function keyboard fitted with 3 keys and a 7-segment and 6-digit LED display. Model LD250 is a SSI display only version;...

  • Page 2: Safety Summary

    • failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the equipment; • Lika Electronic s.r.l. assumes no liability for the customer's failure to comply with these requirements. 1.2 Electrical safety •...

  • Page 3: Identification

    Information is listed in the delivery document too. Please always quote the ordering code and the serial number when reaching Lika Electronic s.r.l. for purchasing spare parts or needing assistance. For any information on the technical characteristics of the product, refer to the technical catalogue.

  • Page 4: Electrical Connections

    LD25x 4 Electrical connections WARNING Turn OFF the power supply before connecting the device. LD250 Display unit only connections shown below, except for terminals 8, 9 and 10 which are not connected. LD251 Display unit with analogue output 1 2 3 1 2 3 4 5 6 7 8 9 10...
  • Page 5 LD25x 4.1 Power supply The unit accepts DC power supply from 17 V to 30 V when using terminals 1 and 2. The consumption depends on the level of the supply voltage (typically 130mA at 30V or 190mA at 17V, plus current taken from aux. output). For AC supply the terminals 0 VAC, 115 VAC or 230 VAC can be used.
  • Page 6 LD25x Typical input circuit of control input: +24V int. +24V int. 4,7k Input Input 4,7k The minimum pulse duration on the Reset input (C) must be 5 msec. 4.4 Adjustable analogue output (LD251 model only) A voltage output is available, operating in a range of 0 ... +10 V or –10 V ... +10 V according to setting.
  • Page 7 LD25x 4.6 Serial RS-232 / RS-485 interface (LD253 model only) Ex factory the unit is set to RS-232 communication. This setting can be changed to RS-485 (2-wire) by means of an internal DIL switch. To access the DIL switch, you must remove the screw terminal connectors and the back panel. Then pull the board to the rear to remove the PCB from its housing.

  • Page 8: Operating The Front Keys

    LD25x 5 Operating the front keys For set-up and other operations the unit is fitted with three front keys which will be denominated as follows in the next pages: ENTER (Input) (Setting) (Command) The functions of the keys are depending on the actual operating state of the unit.
  • Page 9 LD25x 5.2 Selection and setting of parameters 5.2.1 Selecting a parameter The ENTER key will scroll through the menu. The SET key allows to select the corresponding item and change the setting or the numeric value. After this, the selection can be saved by pressing the ENTER key again, which automatically changes over to the next menu item.
  • Page 10 LD25x 5.3 Teach operation NOTE The time-out function remains disabled during all Teach operations. Function ENTER will terminate or abort any Teach operation in progress SET function is fully similar to normal set-up operation CMD will save the display value in the register and change over to the next interpolation point For further details on the Teach procedure see section “9.2 Manual input or „teaching“...
  • Page 11 LD25x 5.5 Code locking of the keypad When the code locking of the keypad has been switched on (see on page 15), any key access first results as follows: ------ To access the menu you must press the following key sequence: within 10 seconds, otherwise the unit will automatically return to the normal display mode.

  • Page 12: Operator Menu

    LD25x 6 Operator menu The menu provides one section with “Basic Parameters” (see section “7.1 Basic settings” on page 14)and another section with “Operational Parameters” (see section “7.2 Operational parameters” on page 16). On the display you will only find those parameters which have been enabled by basic settings. E.g. when the Linearisation function has been disabled in the basic set-up, the associated linearisation parameters will also not appear in the parameter menu.
  • Page 13 LD25x 6.2 Overview of operational parameters LD250 LD251 LD252 LD253 Preselection 1 Preselection 2 M-Factor M-Factor M-Factor M-Factor D-Factor D-Factor D-Factor D-Factor P-Factor P-Factor P-Factor P-Factor Decimal point Decimal point Decimal point Decimal point Display Display Display Display Hi_Bit (MSB) Hi_Bit (MSB) Hi_Bit (MSB) Hi_Bit (MSB)

  • Page 14: Set-Up Procedure

    LD25x 7 Set-up procedure For better understanding the following sections “7.1 Basic settings” and “7.2 Operational parameters” explain settings related to the display only model (LD250). Model-specific settings for analogue output model (LD251), Preselections model (LD252) and Serial Link model (LD253) will be explained separately under sections from “7.3 Model LD251: additional settings for the analogue output“...
  • Page 15 LD25x Menu Setting range Default Keypad protection code (for more details see CodE section “5.5 Code locking of the keypad” on page 11). Keypad enabled continuously. Keypad locked for any access. Keypad locked, except for access to preselections 1 and 2 (LD252 only, see section “7.4 Model LD252: P_frEE additional settings for preselections and switching outputs”...
  • Page 16 LD25x 7.2 Operational parameters Menu Setting Range Default M-Factor * m FAc 1.000 -9.999 … 9.999 Multiplying factor for the SSI value (after consideration of possible bit blanking). D-Factor * d FAc Dividing factor for the SSI value 0.001 … 9.999 1.000 (after consideration of possible bit blanking).
  • Page 17 LD25x Menu Setting Range Default Direction RiGht Parameter to negate the SSI value, resulting in a riGht reversal of the direction of the encoder count. LEFt riGht: increasing values with forward motion. LEFt: decreasing values with forward motion. Error Error (please refer to section “8.6 Error messages” on page 34).
  • Page 18 LD25x Menu Setting Range Default FE rES Reset A Reset command is available to store the actual SSI position to next register 0-PoS. As a result, the display value will become zero at the actual encoder position and all further operation will refer to this new datum point.
  • Page 19 LD25x 7.3 Model LD251: additional settings for the analogue output The Basic menu provides the following additional settings: Menu Setting Range Default A-ChAr Analogue characteristics -0_10 Select one of the following options: -10_10 +/-10 V (bipolar) 0_10 0-10 V (positive output only) 4_20 4-20 mA current output 0_20...
  • Page 20 LD25x The subsequent example shows how to convert the display range from 1400 to 2000 into an analogue signal of 2 - 10 volts. Volts Analogue Output SSI Display Value 1000 2000 3000 4000 5000 A-ChAr = 0 - 10 V AnAbEG = 1400 OFFSEt = 2.000 AnAEnd = 2000...
  • Page 21 LD25x 7.4 Model LD252: additional settings for preselections and switching outputs The basic set-up menu provides the following additional parameters: Menu Default CHAr 1 __r GE Switching characteristics of output 1 __r GE Greater/Equal: output to switch statically ”ON” when display value ≥ preselection 1. __r LE Lower/Equal: output to switch statically ”ON”...
  • Page 22 LD25x The following operational parameters provide setting of the switching thresholds: Menu Setting Range Default PrES_1 Preselection 1 -199999 ... 10000 999999 PrES_2 Preselection 2 -199999 ... 5000 999999 The working direction of the Hysteresis depends on the setting of the switching characteristics.
  • Page 23 LD25x 7.5 Model LD253: additional settings for the serial interface The basic set-up menu contains the main parameters for configuration of the serial interface. Menu Setting Range Default S-Un it Serial Unit Number You can assign any address number between 11 and 99 to your unit.
  • Page 24 LD25x The following operational parameters provide setting of the communication profile: Menu Setting Range Default S-tim Serial Timer Setting 0,000 allows manual activation of a serial data 0,000 transmission at any time. All other settings specify the 0,010 sec 0,100 sec cycle time for automatic transmission (provided the S- …...
  • Page 25 LD25x 7.5.1 PC-Mode Communication with PC mode allows free readout of all parameters and registers of the unit. The subsequent example shows the details of communication for serial readout of the actual display value. This is the general format of a serial request string: EOT = Control character (Hex 04) AD1 = Unit address, High Byte...
  • Page 26 LD25x 7.5.2 Printer-Mode The Printer mode allows cyclic or manual activation of transmissions of the specified register data. The corresponding register can be specified by means of parameter S-CodE. Another parameter called S-mod allows the selection between two different string types: „S-mod“...

  • Page 27: Hints For Application

    LD25x 8 Hints for application 8.1 Master and Slave Operation Set register modE (see section “7.1 Basic settings” on page 14) to position “Master” when the unit should generate the clock signal for the encoder. In this case the clock terminals (CLK) are configured as clock outputs. Screen SSI Encoder SSI Indicator...
  • Page 28 LD25x With Master operation, therefore other settings will result in generation of the next upper or lower value according to above list. With all settings <250.0 kHz the error between set rate and generated rate becomes negligible. It is mandatory to set the baud rate also with “Slave” operation. In this case, however, the setting is only used to determine the pause time for correct synchronization (pause is detected after 4 clock cycles).
  • Page 29 LD25x 8.3 Scaling of the display Under consideration of the scaling parameters which have been described previously, the final display value of the unit will result from: M-Factor DISPLAY [Encoder SSI Data] [0-Position] P-Factor D-Factor NOTE Encoder SSI data are always positive only. When also negative values •...
  • Page 30 LD25x 8.4 Basic modes of operation 8.4.1 Normal SSI display Normal operation provides calculation of the display value from the SSI encoder data and the settings of the scaling factors. Negative values can be achieved by corresponding setting of the zero position (0-Pos item) or by inversion of the direction bit (dir item).
  • Page 31 LD25x 8192 7168 Original encoder signal Encoder 13Bit Direction = 0 0-Position = 1024 Display 1024 degrees 0-PoS = 1024 Data display with positive counting direction 8192 Original encoder signal Encoder 13Bit Direction = 1 0-Position = 1024 1024 degrees 0-PoS = 1024 Display -7168...
  • Page 32 LD25x 8.4.2 “Round-Loop” function This operational mode is often used with rotating round tables or similar applications, where the absolute encoder information is only used for a limited and repeating range of the encoder (as for instance one revolution of the table, which does not necessarily result in one revolution of the encoder shaft).
  • Page 33 LD25x 8.4.3 Operation with “Zero-Crossing” As a special advantage, the “Round-loop” function mode can be used to bypass the mechanical encoder overflow position, because in this mode the unit continues with steady operation, even while the SSI encoder signal passes the mechanical overflow position from maximum value back to zero.
  • Page 34 LD25x 8.5 Testing functions The test menu can be accessed while programming the basic set up, as shown in section “7.1 Basic settings” on page 14, see tESt item. Most of these tests are for factory use only, but the following tests may be useful also to the user: Menu Selection Text...

  • Page 35: Special Functions

    LD25x 9 Special functions 9.1 Linearisation This function allows a non-linear input signal to be converted into a linear representation or vice versa. 16 interpolation points are available, they can be freely arranged over the whole measuring range at any distance. Between two points the unit will interpolate automatically straight lines.
  • Page 36 LD25x EXAMPLE The picture below shows a sluiceway where the gate is controlled by means of a SSI encoder. We would like to display the clearance of the gate "d", but the existing encoder information is proportional to the angular information φ. Display value φ...
  • Page 37 LD25x 9.2 Manual input or „teaching“ of the interpolation points Interpolation points to form the linearisation curve can be entered one after each other, using the same procedure as for all other numeric parameters. This means you will have to enter all parameters P01_x to P16_x and P01_y to P16_y manually using the keypad.
  • Page 38 LD25x Once we have reached and saved the last interpolation points P16_x/y, • the routine will restart with P01_x again. You are free to double-check your settings once more or to make corrections. To finish the Teach procedure, keep ENTER key down for about 2 •...

  • Page 39: Parameters List

    LD25x 10 Parameters list 10.1 General Min. Max. Default Serial Description Text Positions Characters value value value code SSI-Mode modE SSI-Bits bitS Form SSI-Format bAUd SSI-Baudrate 1000.9 100.0 tESt SSI-Test NPN / PNP CHAr Brightness briGht Code Code locking mFAc M-Factor -9.999 +9.999...
  • Page 40 LD25x Min. Max. Default Serial Description Text Positions Characters value value value code LinEAr Linear. mode P01_H -199999 999999 999999 +/-6 Linear. point 1 P01_ -199999 999999 999999 +/-6 P02_H -199999 999999 999999 +/-6 Linear. point 2 P02_ -199999 999999 999999 +/-6 P03_H...
  • Page 41 LD25x 10.2 Analogue output (model LD251) See section “7.3 Model LD251: additional settings for the analogue output” on page 19 Min. Max. Default Serial Description Text Positions Characters value value value code A-CHAr Analogue mode OFFSEt Offset -9,999 +9,999 0,000 +/- 4 GAin Gain...
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  • Page 44 Document release Description 1st issue Lika Electronic Via S. Lorenzo, 25 - 36010 Carrè (VI) - Italy Tel. +39 0445 806600 Fax +39 0445 806699 Italy: eMail info@lika.it - www.lika.it World: eMail info@lika.biz - www.lika.biz...

This manual is also suitable for:

Ld250Ld251Ld252Ld253

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