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1. TECHNOLOGIES R208 Microstepping Driver User Manual Version 1 22 RMS Technologies 2533 N Carson St 4698 Carson City NV 89706 0147 Thank you for purchasing the R208 driver This product is warranted to be free of manufacturing defects for one year from the date of purchase Technical Support for Lin Enigneering a distributor for RMS Technologies By Telephone 408 919 0200 Mon Fri 8 00 a m 5 00 p m On the Web www linengineering com Our technical support group is glad to work with you in answering your questions If you cannot find the solution to your particular application or if for any reason you need additional technical assistance please call technical support at 408 919 0200 PLEASE READ BEFORE USING Before you start ensure that there is a suitable DC power supply and step motor In addition a suitable STEP and DIRECTION pulse source is also required DI SCLAI MER The information provided in this document is believed to be reliable However no responsibility is assumed for any possible inaccuracies or omissions Specifications are subject to change without notice RMS Technologies reserves the right to make changes without further notice to any products herein to improve reliability function or design RMS Technologies does not assume any liability arising out of the application or use of any product or circuit described herein neither does it convey any license under its patent rights nor th
2. Optically Isolated Step Direction and Disable Enable Inputs Selection of holding current to be 23 or 100 of the run current Operates on 12 to 24 VDC Low Power Dissipation Efficient Current Control Thermal Shutdown Under voltage Protection Power on Indicator Power Disable Enable Control Sinusoidal current waveform Phase Current Range from 0 35 to 2 0 Amp Choice of reading each step input on the rising edge or falling edge of pulse Default Setting is 1 0 Amp RMS or 1 4 Amp Peak The default current can be preset at different values prior to shipping per customer s request Automatic Current Cutback Feature The R208 unit offers the user the option of using the Current Cutback function in the form of a dip switch The default setting is set to the Enabled position This means that when pulse input is discontinued the driver will produce 23 of the Peak running current When this switch is set to the Disabled position the driver will produce 100 of the running current To change the position of the Current Cutback Switch simply move the switch towards the 100 mark on the silk screen This indicates that it is using 100 of the run current In other words there is no cutback to the current PHASE Cu T ADJUST R208 MICROSTEP DRIVER 1 FAVE GROUND GA LOGIC GROUND Si S 5 i R2 OE 1 Ga AN 1 STEP F il si l DISABLE be S D i S D fun DIRECTION e RMS Technologies Pag
3. the appropriate power supply to the R208 unit In order to decrease the current output adjust the potentiometer in the clockwise direction using a flathead screwdriver Please use the following formula to obtain the desired current output Current I 2 22 x Maer 0 14 when cutback current function is enabled Current I 0 72 X Vrer 0 14 when cutback current function is disabled Vie I 0 14 2 22 where I Motor s Rated Current RMS Value To achieve more power when running a motor rated less than 1 4 Amp use Peak Current which will multiply the Motor s Rated current by 1 4 Amps Please use this formula Vie I 0 14 1 554 I is still the Motor s Rated Current Currently the default setting is at Ver 0 55 VDC 1 0 Amp 0 14 1 554 Reference Voltage refers to the voltage level across the potentiometer Figure 3 Adjusting the output current RMS Technologies Page 9 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 How to Connect To connect the R208 according to Figure 4 begin by connecting your step motor to the R208 for details on how to make that connection refer to Section 8 Motor Connections Next connect the DB 9 mating connector to the R208 If using a function generator take the positive end and connect it to Pin 9 Step and connect the negative end of the generator and connect it to the negative of the 5 VDC power supply Take the positive end of the 5 VDC power supply an
4. 08 Microstepping Driver Manual 8 31 2007 R208 User Manual Product R208 Version 1 22 Date 8 31 2007 Version History 1 16 02 02 2005 Bn WE equation for Voltage Reference 11 09 2006 O rape Errors 1 E 6 7 2007 Added min order qty for R208 supply 8 24 2007 Updated info on internal resistors opto isolatd inputs 8 31 2007 Updated RoHS style R208 boards RMS Technologies Page 3 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 TABLE OF CONTENTS 1 FEATURES 5 Automatic Current Cutback Feature 5 2 ELECTRICAL SPECIFICATIONS 6 3 OPERATING SPECIFICATIONS 6 Operating Temperature 6 Logic Input Timing 6 4 MECHANICAL SPECIFICATIONS 7 Dimensions 7 5 PIN ASSIGNMENTS 8 6 CONNECTION SPECIFICATIONS 8 List of Parts 8 Mating Connectors 8 Adjusting the Output Current 9 How to Connect 10 Alternative Step Resolution Connection 11 7 CONFIGURING AND CONTROLLING THE R208 12 Signal Control Specifications 12 Internal Schematic 12 Internal Schematic 13 Resistor Values for the Opto Supply 13 8 MOTOR CONNECTIONS 14 4 Lead Wire Motor Connection 14 6 Lead Wire Motor Connection 14 8 Lead Wire Motor Connection 15 9 TROUBLESHOOTING amp FAQ 16 RMS Technologies Page 4 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 1 FEATURES Bipolar Step Motor Driver Low Cost Small size 2 464 x 1 932 x 848 62 59 x 49 07 x 21 54 mm Selectable Step Resolutions of Full Step Half Step 4x 8x Microsteps
5. CK Figure 2 R208 Dimensions Diagram RMS Technologies Page 7 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 5 PIN ASSIGNMENTS A DB 9 female connector cable receives power and provides the control connections for the R208 Driver Active signals are optically isolated An open collector drive is required to provide pulses for Step levels for Direction and Disable Enable AAL 8 COLOR FUNCTION DESCRI PTI ON e _ 26 AWG Lead ee 1 Red V Motor Supply Voltage 12 to 24 VDC 2 Black SR1 Input Step Resolution 1 Pins 2 amp 3 are used to preset the step resolution by selective contact to ground Pin 7 3 Brown SR2 Input Step Resolution 2 Pins 2 amp 3 are used to preset the step resolution by selective contact to ground Pin 7 4 Black White Enable Disable This input is used to enable disable the Input output of the driver 5 Orange Direction Input This input is used to change the rotation direction of the motor 6 Green Power Ground The ground or return of power supply connects here 7 White Logic Ground Used to ground to the logic functions i e step resolution 8 Blue Opto Supply 5 VDC input used to supply power to the Input isolated logic inputs 9 Yellow Step Clock Connects to the open collector drive Table 1 Pin Assignments WARNING Do not apply differential voltage on SR1 and SR2 this will damage the driver The Resistors shall be connected in series with each Input Pi
6. blems and Solutions e The Motor is in Holding Position but does not rotate This means that Power is being supplied to the driver and motor so the power supply is OK However the signal generator might be causing the problem Try changing the signal to TTL If this does not help is the external 5 VDC Power connected Is Pin 4 enable disable touching Pin 7 logic ground This will disable the driver from running e When setting the current to the R208 the voltmeter never gives a clear reading If the voltmeter is not giving a clear reading and you are unable to reach the desired value for V then the driver has been damaged e The Microstepping doesn t always change to the correct step resolution Changing the microstepping on the fly might ruin the driver It is recommended that you disable the motor from running either turn off the power or use the disable pin then change the step resolution Will potential back EMF from the step motor damage the R208 The circuit on the board is protected and it should not be an issue if you are using the driver properly How long are the DB 9 mating cable and crimp style motor cable Are the leads open on the other end Both cables are about 12 inches in length The leads are open at the ends How many turns is the output current potentiometer The output current potentiometer is multi turn We recommend using a voltimeter if you need to adjust the output current Is the R208 a logic so
7. d connect it to Pin 8 the Opto Supply Refer to Table 6 for Opto supply resistor values Finally connect the external 12 to 24 VDC power supply Connect Pin 1 Power to the positive terminal of the power supply Connect Pin 6 Power Ground to the negative terminal of the power supply Remember that the default Current is set to 1 4 Amp BE SURE NOT TO BURN YOUR STEP MOTOR WITH THIS DEFAULT CURRENT SETTING In order to change this value please see the section above called Adjusting the Output Current 12 to 24 DC CONTROLLER DRIVER 5 V DC RED Enable Disable BLK BRWN BLK WHT Direction Pulse Generator TFUE PWR GND Figure 4 Connections Diagram WARNI NG Avoid touching Pin 1 12 to 24 VDC to Pins 2 3 4 or 5 These four pins are connected to optocouplers which can only handle a few milliamps of current RMS Technologies Page 10 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 Alternative Step Resolution Connection It is possible to change the microstepping resolution by using the signal from the controller CONTROLLER DRIVER 12 70 244 VOC oR Re DISABLE DIRECTION POWER GROUND LOGIC GROUND OHIO SUPPLY STEP Figure 5 Alternative Step Resolution Connection By sending a high signal to Pin 2 and or Pin 3 the connection between these pins will be effectively closed with Pin 7 This will change the microstepping resolution Please refer to the Table 3 for Step Resolution Setti
8. ding and Full Winding Six wire motors contain a center tap on each of the two windings For a half winding connection the center tap and one end of the wires are used Figure 7 2 6 Lead Wire Half Winding Connection 6 Lead Wire Motor Connection Full Winding For a full winding connection use both end wires the center tap is ignored NC No Connection RMS Technologies Page 14 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 Figure 7 3 6 Lead Wire Full Winding Connection 8 Lead Wire Motor Connection Parallel Connection Eight wire motors can be connected in two ways Parallel and Series When in parallel the wires are simply connected such that the beginning of each winding are connected together IO OI Let wi Figure 7 4 8 Lead Wire Parallel Connection 8 Lead Wire Motor Connection Series Connection Be sure to set the drive current to exactly half of the motor s rated parallel current rating when using the series connection Io el E wi Figure 7 5 8 Lead Wire Series Connection RMS Technologies Page 15 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 9 TROUBLESHOOTING amp FAQ When you first encounter a problem the first step is to identify which component is the cause of the problem You can do this by swapping out individual components and verifying if they work independently Make sure that you have connected all the wiring correctly this is a common cause of most problems Pro
9. e rights of others CHANGES TO THE R208 DRIVER BOARD Prior to OCTOBER 1 2005 the R208 driver board used slower opto couplers limiting the step pulse timing The old driver board also read step pulses on the rising edge A revision change was made on October 1 2005 using more advanced opto couplers These new opto couplers can read faster data yet they are also more sensitive to older PLC step pulses If your step pulse signal is not clear the R208 will pick this up and the motor will rotate rough and irratic The new boards read step pulses on the falling edge If the falling edge of your step pulse is not a clear signal the motor will rotate rough and irratic So far only a small handful of customers have been affected by the change Mostly those that use PLC s from the early 90 s and older Customers can still request the old R208 boards in quantities of 100 per order blanket releases are OK The old boards are under part number R208 05 New ROHS style boards All boards sold after September 31 2007 are RoHS compliant In addition to the RoHS change the R208 has new features to be able to change holding current from 23 or 100 of the run current and to change which step pulse edge to read the pulses from rising edge or falling edge Special Symbols Indicates a WARNING and that this information could prevent injury loss of property or even death in extreme cases RMS Technologies Page 2 Version 1 22 R2
10. e 5 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 2 ELECTRICAL SPECIFICATIONS Supply Voltage 12 to 24 VDC Peak Current 0 35 to 2 0 Amps OR 0 25 to 1 4 Amps Phase 100 duty cycle is OK as long as bottom of unit is 50 C or less 3 OPERATING SPECIFICATIONS Operating Temperature 20 to 50 Celsius Humidity Range 0 to 95 non condensing Logic Input Timing A Minimum Command Active Time Before Step Pulse Data Set up Time 200 nanoseconds B Minimum Command Active Time After Step Pulse Data Hold Time 200 nanoseconds C Minimum Step Pulse Width 20 microseconds D Minimum Step Low Time 20 microseconds E Maximum Power Down Recovery Time 20 milliseconds Maximum Step Frequency 30 kHz 50 STEP C D DIR RESET A Jy B E SLEEP Figure 1 Timing Diagram NOTE The R208 by default steps on the falling edge into the opto coupler RMS Technologies Page 6 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 4 MECHANICAL SPECIFICATIONS Size 2 464 x 1 932 x 848 62 59 mm x 49 07 mm x 21 54 mm Weight 3 68 oz 104 g Mounting Four screws 1 622 x 2 003 41 20 mm x 50 88 mm Cover Steel Plate Heatsink Aluminum Anodized Color Black Exterior Dimensions 4X R 079 BBA A cum IRMS technotosies ce ADJUST amp R20 MICROSTEP DRIVER 1 634 2 003 2 464 PWR GROUND DEA 5 SI LOGIC GROUND 125 848 e 338 i KS O a Ki E
11. ly turn power off switch the dipswitch towards the positive silkscreen marker then power back on PHASE CURRENT ADJUST d R208 MICROSTEP DRIVER _ o 100 bh 2 2 g z T Sege NM e lal TERN Sis Saye ey ea ey OL ORIG RIOR o GO GO Note Old units read the pulse on the falling edge RMS Technologies Page 12 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 Internal Schematic The R208 has 3 optically isolated logic inputs These inputs are isolated to minimize or eliminate electrical noise coupled onto the drive control signals Each input is internally pulled up to the level of the optocoupler supply and may be connected to sinking outputs on a controller or a PLC These inputs are Enable Disable Pin 4 Direction Pin 5 Step Clock Pin 9 Figure 6 Optically Isolated Inputs R208 Internal J p y H SE Within the Driver lies three 680 Resistors and three Optocouplers The current is limited to 7 mA due to these three Opto Couplers bod Resistor Values for the Opto Supply The optocouplers must be powered by an external power supply to maintain isolation The Opto Supply for the optocouplers can be between 5 to 24 VDC with respect to the signal input It is recommended to use a 5 VDC Opto Supply in order to limit the current going into the optocouplers to 10 mA However if the Supply is greater than 5 VDC then a resistor must be connected in series with each Signal line
12. n 4 Disable Pin 5 Direction and Pin 9 Step if you are to use an opto supply of more than 5VDC See Section 7 6 CONNECTION SPECIFICATIONS List of Parts Connection of the R208 is simple Here is what you need e External Main Power Supply 12 to 24 VDC 5 VDC Power Supply used as the Opto Supply Voltmeter Function Generator An appropriate Bipolar Step Motor Mating Connector Cables that are provided with the R208 Driver Mating Connectors A mating DB 9 connector and crimp style connector will be provided Color Function P N 090 00019 P N 090 00018 Table 2 Pinouts for 090 018 RMS Technologies Page 8 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 Adjusting the Output Current Before connecting a step motor to this driver use the following procedure to check the output current of the R208 unit The default output current is set at 1 0 Amp WARNING To avoid damaging your step motor with the default setting the output current should be adjusted before connecting the step motor 1 Ensure that the step motor is not connected to the R208 unit Do not supply pulse input to the R208 unit while adjusting the Output Current This will affect the voltage level reading on the voltmeter Place one probe of the voltmeter through the slot of the cover and attach it to the lead of the potentiometer The other probe of the voltmeter shall be attached to Pin 7 of the mating connector assembly Part 90 019 Apply
13. ngs NOTE The microstepping resolution should not be changed on the fly loss of step may occur RMS Technologies Page 11 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 7 CONFIGURING AND CONTROLLING THE R208 Signal Control Specifications Default Settings Table 3 Default Settings Current 1 4 Amp The R208 is set to these default Step Resolution 8x microstep SEN when Gig 2 S ai and 5 Direction of rotation Counterclockwise ae tebe OPEN AMA UNLOUCNEC Current Cutback Enabled Switch Read step pulse from Falling Edge Step Resolution Table 4 Step Resolution Settings Black Brown SR1 Pin 2 and SR2 Pin 3 are used Full Close Close to preset the step resolution by Half Close Open selective contact closure to ground 1 4 Open Close Pin 7 1 8 Open Open WARNING Do not change the Step Resolution on the fly loss of step will occur Enable Disable Table 5 Enable Open Disable the Driver by closing the connection Disable Close between Pin 4 and Signal Ground Direction Table 6 Clockwise Close Change direction of rotation by closing the Counterclockwise Open connections between Pin 5 and the Signal Ground Step Pulse Input Read Selection The R208 ROHS version now has the option to change the way the R208 reads in the step pulse train By default it understands one pulse when it reads the falling edge of the pulse To change this setting so that it reads one pulse when it sees a rising edge of the pulse simp
14. to maintain 10 mA of current running through the optocouplers Do NOT provide more than 10 mA or damage may occur to the driver Refer to Table 7 amp 8 for the corresponding Resistor Values The Resistors shall be connected in series with each Input Pin 4 Disable Pin 5 Direction and Pin 9 Step Step amp Direction lines have a 470 ohm internal resistor 5V 10V 15V 24V 0 500 1000 2000 o Ya watt Ya watt Y2 watt Disable line has a 680 ohm internal resistor Voltage SV 10V 15V 24V E Ohms needed 0 750 1500 2700 OU 1 8 watt Y watt 12 watt Table 7 amp 8 Resistor Values for inputs RMS Technologies Page 13 Version 1 22 R208 Microstepping Driver Manual 8 31 2007 8 MOTOR CONNECTIONS Step Motors have 4 6 or 8 wires To better understand how to connect your step motor with your R208 Driver follow the Figures below for the corresponding motor NOTE The dots indicate the starting position of the wires when wound 4 Lead Wire Motor Connection Connect one set of windings to the A terminals Connect the other set of windings to the B terminals If the set of windings is unclear take a pair of wires use an ohmmeter to check for continuity When you find the first two wires that have continuity connect it to the A terminals Connect the other two to the B terminals Figure 7 1 4 Lead Wire Motor Connection 6 Lead Wire Motor Connection Half Winding Six wire motors can be wound in two ways Half Win
15. urcing or sinking The R208 is a Logic sinking driver The R208 driver requires an external power source power is put into the driver whereas a logic sourcing driver can provide a power source What is the heat dissipation of the R208 It has 35 C Watt heat dissipation which is very low compared to other drivers RMS Technologies Page 16 Version 1 22 R208 Microstepping Driver Manual 8 31 2007

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