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1. Module is designed to be properly grounded e Do not turn the module on if it was already damaged with water chemicals mechanical or electrical shock e Do not operate without loads attached Faults Module sets the fault state in the following cases module s internal overheating overheating in TEC1 channel overheating in TEC2 channel NTC1 not connected NTC2 not connected diode not connected overcurrent in DIODE channel overvoltage in DIODE channel interlock circuit interrupted Once the fault case has occurred you should eliminate the fault cause then turn the module off and then turn it on again Operations e connect laser diode to the module e opt connect Peltiers to the module e opt connect feedback loops to the module e opt connect the module to the computer e connect footswitch handswitch choke plug to the module e connect module to the mains e switch the module on POWER switch e set desired diode current CURRENT buttons e opt set desired diode temperature and laser rod temperature TEMPERATURE and TEMPERATURE buttons e turn on or turn off slow start SS button set its parameters via RS 232 e opt select pulsed operation mode instead of CW CW by default set parameters of the pulsed mode via RS 232 e opt turn temperature controllers on TEC1 and TEC2 buttons it s recommended to wait while desired diode temperature will become established e enable the current th2. AC IEC60950 IEC60601 1 _ENS55011 Class A Forced air cooling with embedded fans 19 width 2U height 250mm depth Operation temperature 0 40 C Storage temperature 20 60 C Humidity Typical output 30 eee e a Ch1 Rise 816 845 Ch1 Fall 238 2us chi Width 5 950ms 20 0A Ch2 2 00V sM1 00ms Ch2 1 88V 18 Mar 2009 20 40 15 43 55 Yellow curve depicts some arbitrary output current pulse Timescale is 1 ms div RS 232 interface description RS 232 connection parameters 38400 bps 8 data bits I stop bit no parity Command format is command data optionally end of line command is 1 character long see list below data is ASCII string of adjusting value end of line symbols are r n or n List of available commands set get diode current c C in ampere set get repetition rate f F in Hz 0 for CW mode in dependence on pulse width some values can be ignored set get pulse width p P in milliseconds set get temperature t T and g G in degrees set get slowstart time s S is seconds set get SS button state a A set get TEC1 button state j J set get TEC2 button state u U set get DIODE button state r R get current monitor value Y get temperature monitors value W and Q get the fault state Z echo on off e
3. ax parameters cannot be selected independently Graphically their mutual dependence is depicted on the drawing below The allowed area lies below the red curve Step 1 4 Input voltage limitations Modules with the maximal output power up to 1000W can have dual 110 230VAC input Modules in 1000 1500W range can have 230VAC input only 140 D KN 80 H 60 Ps hl rn 40 N V Vmax 20 a I FOG 20 40 60 80 100 Step 2 TEC controllers Step 2 1 Quantity of temperature controllers You may select module with none one or two embedded temperature controllers In the case of two TEC controllers installed their parameters are selected and controlled in independent way Standardly the first TEC controller is used to control the pumping diode temperature the second one is used to control the laser rod temperature Step 2 2 Parameters Each temperature controller has limitations to its maximal output current and maximal output voltage Besides each temperature controller has limitation to its maximal output power As a result temperature controller parameters should be in range ImMaxctEc lt LOA Vmaxcrec lt 20V Wmax tec lt 150W Exact Imax rec and Vuaxcrec ratio depends on V A curve of your Peltier and should be chosen in accordance with its datasheet Step 2 3 Thermistor limitations Standardly our TEC controllers are designed to get feedback from 10kO
4. ded there e LDD 2U 40A 4V 5A 10V 25kOhmNTC 2A 2V DI current source with 40A maximal output current 4V compliance voltage two temperature controllers one with 5A maximal output current and 10V maximal output voltage with the feedback from 25kOhm NTC thermistor the other has 2A 2V parameters feedback loop is a standard one dual input option Description FRONT PANEL DESCRIPTION F NER CURRENT MONITOR TEMPERATURE B o 00 00 9 0 0g SS TEC TEC2 a OO SYNCHRO H CURRENT m POWER switch switches module on and off CURRENT group of 4 digits indicator and two buttons is used to set diode current from Imn to Imax see specifications section TEMPERATURE and TEMPERATURE2 groups of 4 digits indicator and two buttons are used to set temperature of the laser diode and the laser rod from Tmn to Tmax See specifications section Each TEMPERATURE group may be switched into temperature monitor mode Pressing of two temperature buttons at the same time switches the corresponding group into the monitor mode the second press switches it back CURRENT MONITOR indicator measures and indicates current through diode SS button turns slow start regime on and off Slow start rise time can be settled through the RS 232 interface by default it s 5s TEC1 and TEC2 buttons turns temperature controllers on and off Once this button is pressed module is trying to stabilize diode rod temperature There are two LED
5. hm NTC thermistors By default we supply them with our modules Sometimes laser diode assembly has already incorporated thermistor of some different kind In that case please submit the detailed information about how the feedback loop is organized Step 2 4 Heating power limitations Please note that LDD 2U cannot provide temperature control for high power laser diodes For example 500W optical power laser diode produces about 500W of heat power that cannot be removed with the only 150W temperature controller It s your responsibility to design proper cooling system and to define its parameters precisely Our recommendation is not to use Peltier cooling for laser diodes with Imax Vmax gt 150W Of course it s just a recommendation and the certain border depends on exact design of your cooling system Step 3 Part numbers Part number has the format as follows LDD 2U Imax Vmax optionally IMaxcrec 1 V VMAX TEC 1 optionally R 1 optionally IMax tEc2 Vmax rec2 optionally R2 optionally DI where R1 and R2 is the information about your thermistors DI means dual input option Examples e LDD 2U 100A 2V 8A 15V current source with 100A maximal output current 2V compliance voltage one temperature controller with 8A maximal output current and 15V maximal output voltage e LDD 2U 100A 20V 8A 15V wrong part number because 1 100A 20V exceed 1500W maximal possible output power and 2 Peltier cooling isn t recommen
6. rev 1 01 2011 09 07 LDD 2U laser diode controller User manual Overview LDD 2U laser diode controller consists of LDD series laser diode driver none one two temperature controllers user interface and 19 inch rack mounted coverage case Module s input is 1 10VAC or 230VAC mains module s outputs are laser diode connections and Peltiers connections User interface is dual front panel interface and RS 232 interface Module is designed for CW operations In the spite of this the low speed modulation of the output is available parameters of modulation are set via RS 232 interface Sy LP Aw ms i i Oi 5 Med I SS SS Parameters selection part numbers Step 1 Laser diode driver parameters At the beginning the parameters of the embedded laser diode driver current source should be selected The most important parameters to be selected are the maximal output current and the compliance voltage Step 1 1 Maximal output current Maximal output current Imax is selected by the customer in range 10 100A Module s output current can never exceed this Imax value Step 1 2 Compliance voltage Compliance voltage Vmax is selected by the customer in range 2 150V Module s output voltage can never exceed Vmax value Step 1 3 Maximal output power limitations Maximal output power of the module Wmax is defined as a product of Imax and Vmax and can never exceed 1500W As a result Imax and Vm
7. rough diode DIODE button e press footswitch e turn the current through diode off DIODE button e turn temperature controller off TEC1 and TEC2 buttons e switch the module off POWER switch Specifications INPUT Voltage 1 10VAC or 110 230VAC 50 60 Hz depends on the output power and if DI option is selected LASER DIODE DRIVER SPECIFICATIONS Max output current Imax Max output voltage Vmax Max output power Output current adjustment range Efficiency Rise fall time Current regulation accuracy Current value error Current overshoot selectable in ra range 10A 100A range 1 selectable in range 2V 150V range 10 100 of Imax more than 80 lt 1 ms 10 to 90 full current lt 500 us on request lt 1 of Imax lt 1 of Imax TEC CONTROLLERS SPECIFICATIONS Type Max output current Max output voltage Max output power Feedback loop Temperature set points Temperature set points accuracy and stability PROTECTIONS Modules overheating Overheating in TEC channels Diode overcurrent protection SAFETY PFC value Leakage current Input output isolation voltage Safety approval EMC approval COOLING DIMENSIONS ENVIRONMENT bidirectional up to 10A _up to 20V cannot exceed 150W 10 kOhm NTC other on request _ 10 40 C other on request 0 1 70 C Tmax 10 C other on request gt 0 98 active lt 500 pA 4000 V
8. s nearby each TEC button e the left one indicates if temperature controller is turned on e the right one indicates if diode rod temperature is set successfully DIODE button turns the current through diode on and off LED located nearby indicates if current is on BACK PANEL DESCRIPTION MAINS socket cable is supplied with the driver to connect module to the mains FUSES two fuses their rating depends on the laser diode driver selected GROUND ground stud DIODE studs cables are supplied with the driver two M6 studs to connect the laser diode to the module TEC1 and TEC2 connectors cables are supplied with the driver two Molex Minifit connectors to connect Peltier and feedback loop to the module INTERLOCK connector interlock circuit connection the choke plug to short circuit the interlock is supplied with the module FOOTSWITCH connector footswitch handswitch circuit connection simple handswitch is supplied with the driver the choke plug to short circuit the footswitch is also supplied with the module RS 232 connector cable is supplied with the driver to connect module to the computer Safety e During operations all protective covers of the equipment must be securely in place and all electrical connections must be properly attached e Don t remove protective covers There are no user serviceable parts inside this equipment Do not self repair the driver e
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