Meerstetter Engineering LDD-1121 User Manual Download Page 1 | Manualshive

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User Manual

Laser Diode Driver

LDD-Family:

LDD-1124
LDD-1121
LDD-1125

Meerstetter Engineering GmbH
Schulhausgasse 12
3113 Rubigen, Switzerland

Phone: +41 31 712 01 01

Email: [email protected]

Website: www.meerstetter.ch

Meerstetter Engineering GmbH (ME) reserves the right to make changes without further notice to the product described herein. Information
furnished by ME is believed to be accurate and reliable. However typical parameters can vary depending on the application and actual performance
may vary over time. All operating parameters must be validated by the customer under actual application conditions.

SWISS MADE

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Summary of Contents for LDD-1121

Page 1: ...tter ch Meerstetter Engineering GmbH ME reserves the right to make changes without further notice to the product described herein Information furnished by ME is believed to be accurate and reliable Ho...

Page 2: ......

Page 3: ...porting and Exporting ini Configuration Files 12 Settings Dump mepar File 13 5 2 Tab1 Monitor 14 5 3 Tab2 Operation Control 16 Modulated CW Current Current Stage 17 Current Pulses Chopped CW Pulse Sta...

Page 4: ...wer Supply Mounting M3 size Bores 7 5mm in Length M1 x 4 0 mm y 86 0 mm M2 x 98 0 mm y 86 0 mm M3 x 4 0 mm y 4 0 mm M4 x 98 0 mm y 4 0 mm Power Terminals M4 size Screws Pin Descriptions Platform Bus X...

Page 5: ...ivers can be equipped with light measurement hardware to be used in conjunction with a photodiode which will allow laser power monitoring or laser power closed loop control depending on the firmware T...

Page 6: ...or above Redistributable Package o Display resolution 1024x768 or greater Copy the latest version of the Service Software executable e g LDD Service version exe to the Service PC and launch it All req...

Page 7: ...ware The square in the bottom left corner of the LDD Service Software should be green and Connected The Device Status indicator should be amber and Ready A color coded indicator informs about the curr...

Page 8: ...Configuration Tab Check System Settings Switch to Tab5 Settings Locate the Current PID Regulation Parameters group box Please check the PID parameters are set according to the illustration to the rig...

Page 9: ...voltage Also Driver Values Tab1 should now indicate three balanced buck converter currents delivering one third of the total current each For early evaluation and training purposes the use of a dummy...

Page 10: ...nterfaces is selected from the menu see illustration below Observe the Enable NA button become live after selection of Data Interfaces as Enable Settings input source This button allows the user to to...

Page 11: ...PID controller The stage s input can either be an external line an internal generator or the output of the light control stage selected models only That laser power control gets feedback input from l...

Page 12: ...eave fields empty when switching between tabs in order to prevent accidental misconfiguration Storing a new parameter set to the LDD takes a certain amount of time To prevent data corruption the Reset...

Page 13: ...e every line contains a parameter string that is specific to function firmware and device type Figure 6 Creation of a mepar File Tab Maintenance for settings dump by third party host Using the communi...

Page 14: ...current averaged over 100 s It will oversee fast pulses o Laser Diode Current Pulse shows the value of the last averaged pulse current plateau This measurement method is designed to determine pulse a...

Page 15: ...ax 50 mA apart the more stable Laser Diode Current CW is selected Else i e no pulse has occurred and Laser Diode Current CW and Laser Diode Current Actual are dissimilar Laser Diode Current Actual is...

Page 16: ...mote control by RS485 and USB data interfaces is preferable The use of an analog voltage signal is also possible but not recommended for precision applications Tab2 provides a convenient interface for...

Page 17: ...Source Int Generator The internal generator produces a digital signal according to High Time and Low Time This signal is used to chop the output of the CW stage The steepness of the edges of the chopp...

Page 18: ...ration modes It requires all involved elements and subordinate processes to function reliably It is also highly hardware and application dependent Laser Power Control should only be set up and activat...

Page 19: ...ical system s losses as well as the photodiode s characteristics Chose a very conservative Light Control Soft Start Configuration e g have the Current Limiter Start Val set to 0 A and the Current Limi...

Page 20: ...ser Power Charting Laser diode current red and laser power blue on selected LDD models traces are selected using the tick boxes Signals can be triggered upon None LDD Enable or current Pulse at a chos...

Page 21: ...the MeCom Document 5130 Max Current Error 1 85 18 5 35 A Slope Limit 0 01 A s Trigger Output Settings Pulse Trigger Output OFF Communication Comm Watchdog 0 s Device Address Device Address 1 RS485 Cha...

Page 22: ...bility Kp 3 Ti 1E 03 Td 1E 09 Kp 10 Ti 1E 04 Td 1E 08 Kp 18 Ti 2E 05 Td 1E 07 Table E Suggested PID parameter sets to be optimized for target applications In an empirical optimization procedure one wo...

Page 23: ...on the Channel1 Baud rate and the laser diode driver s device address must be specified in Tab Settings restart required A response delay can improve compatibility with host hard and software RS485 co...

Page 24: ...be the lower error threshold was factory set to 20 C The lower and the upper error limits should be set to more meaningful values once a temperature probe is connected and configured Figure 15 Lower e...

Page 25: ...le Point and Upper Point and look up their corresponding resistances in your NTC sensor s data sheet The resulting curve will be most precise for small ranges and with a centered middle point located...

Page 26: ...volatile and need to be reentered every time the LDD Service Software is launched Starting the software with application arguments allows to directly load the desired communication settings Figure 19...

Page 27: ...ice providing connection to the network e g the HMI of an LTR 1200 Rack Enclosure must be configured correctly IP Address Subnet Mask Gateway etc see device s manual In Service Communication Settings...

Page 28: ...adcast to all devices on the bus and the device that matches type and S N will accept it For that procedure all other active Service Software functions are temporarily suspended Enable Set Address fun...

Page 29: ...a new firmware open Tab6 Maintenance and chose Device Boot Loader LDD 1121 based laser diode drivers have got two sets of firmware hex for the STM32 microcontroller and mcs for the FPGA Please procee...

Page 30: ...wish to calibrate the hardware of their temperature acquisition system or to adjust the characteristics of a particular sensor can make amendments in the Tab7 Expert This tab is normally hidden and th...

Page 31: ...the corresponding information in the paragraph describing Tab3 Laser Power Control and in chapter 5 4 In Laser Diode Light Measurement Settings the value of the reference shunt resistor for the laser...

Page 32: ...are reset or power cycled to the clear the error status The blue STM32 status LED is reserved for future use Green LED Red LED Signification Blinking slowly Ready status no errors LDD power output dis...

Page 33: ...at Meerstetter Engineering in the processes of error diagnosis or remote debugging Error Numbers 1 99 Universal for LDD Family and TEC Family devices Code Description 1 STM32HANDLER_NMI 2 STM32HANDLER...

Page 34: ...e value out of range 29 PAR_FROM_ISR Parameter save to flash called from interrupt Table M Parameter Errors Code Description Error Condition 30 UNDERVOL_PWR 10 5 V 31 OVERVOL_PWR Input voltage net out...

Page 35: ...Description Error Condition Remedy 70 FPGA_CRC Wrong checksum for FPGA config memory Reinstall FW FPGA config via internal bootloader 71 FPGA_GENERAL FPGA malfunction 72 FPGA_VERSION Microcontroller f...

Page 36: ..._SYM2 113 FPGA_SYM3 Overcurrent in buck converter 1 2 or 3 hardware protection Try to optimize PID parameters 115 FPGA_MPWR LDD input voltage out of range 10 5 V MPWR 27 V 116 FPGA_M10V 10 V internal...

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