User`s Manual
Contents
1. The 3225 can match medium and small size stepping motors from Nema size 14 to 23 To achieve good driving performances it is important to select supply voltage and output current properly Generally speaking supply voltage determines the high speed performance of the motor while output current determines the output torque of the driven motor particularly at lower speed Higher supply voltage will allow higher motor speed to be achieved at the price of more noise and heating If the motion speed requirement is low it s better to use lower supply voltage to decrease noise heating and improve reliability Contents Regulated or Unregulated Power Supply Both regulated and unregulated power supplies can be used to supply the driver However unregulated power supplies are preferred due to their ability to withstand current surge If regulated power supplies such as most switching supplies are indeed used it is important to have large current output rating to avoid problems like current clamp for example using 4A supply for 3A motor driver operation On the other hand if unregulated supply is used one may use a power supply of lower current rating than that of motor typically 50 70 of motor current The reason is that the driver draws current from the power supply capacitor of the unregulated supply only during the ON duration of the PWM cycle but not during the OFF duration Therefore the average current withdrawn from power suppl2. coil higher speed connections Full Coil Configurations The full coil configuration on a six lead motor should be used in applications where higher torque at lower speeds is desired This configuration is also referred to as full copper In full coil mode the motors should be run at only 70 of their rated current to prevent over heating Figure 7 6 lead motor full coil higher torque connections Contents Connections to 8 lead Motors 8 lead motors offer a high degree of flexibility to the system designer in that they may be connected in series or parallel thus satisfying a wide range of applications Series Connections A series motor configuration would typically be used in applications where a higher torque at lower speeds is required Because this configuration has the most inductance the performance will start to degrade at higher speeds In series mode the motors should also be run at only 70 of their rated current to prevent over heating P2 At B B Figure 8 8 lead motor series connections Parallel Connections An 8 lead motor in a parallel configuration offers a more stable but lower torque at lower speeds But because of the lower inductance there will be higher torque at higher speeds Multiply the per phase or unipolar current rating by 1 96 or the bipolar current rating by 1 4 to determine the peak output current PZ Figure 9 8 lead motor parallel connections 6 Power Supply Selection
3. connections of the 3225 Controller Driver ENABLE R 0 if VOC 5V R 1K Power gt 0 125W if VOC 12V R 2X Power gt 0 1258 if VOCe24V R must be connected to control signal terminal Figure 10 Typical connection with open collector controller Contents Controller R 0 if YOL o R 1K Power 1258 if WOC 12 R ZK Power 1250 if WOC 24V E suat be conned ted LSE contral signal tereinal Figure 11 Typical connection with difference controller 10 Sequence Chart of Control Signals In order to avoid some fault operations and deviations PUL DIR and ENA should abide by some rules shown as the following diagram t bari he t High Level gt 3 ah miii ut pame y lh High Le wela OV paar ai Low Level lt Q SV JUS i DIR Figurel2 Sequence chart of control signals Notes 1 t ENA must be ahead of DIR by at least 5us Usually ENA and ENA are NC not connected See Connector P1 Configurations for more information 2 tz DIR must be ahead of PUL effective edge by at least Sus to ensure correct direction 3 t High level width not less than 5 0us Contents 4 t4 Low level width not less than 5 0us 11 Frequently Asked Questions In the event that your doesn t operate properly the first step is to identify whether the problem is electrical or mechanical in nature The next step is to isolate the system component that is causing the problem As p
4. or Effective Level and Control Signal Mode There are two jumpers J1 and J2 inside the 3225 specifically for selecting effective pulse edge or effective level and control signal mode as shown in figure 2 Default setting is PUL DIR mode and upward rising edge effective Jl J2 off J2 a J1 J2 open circuit b J1 short circuit J2 open circuit PUL DIR mode and effective at upward rising edge PUL DIR mode and effective at downward falling edge o F 9 n fol 2 8 n g ft c J1 open circuit J2 short circuit d J1 J2short circuit CW CCW mode and effective CW CCW mode and effective at high level The fixed level at low level The fixed level Figure 2 J1 and J2 jumpers Connector P2 Configurations DC power supply 12 24VDC Including voltage fluctuation and EMF voltage Contents O B4B Motor Phase B 4 Control Signal Connector P1 Interface The 3225 uses opto couplers to increase noise immunity and interface flexibility If the opto couplers supply voltage is higher than 5V a current limiting resistor needs to be connected at each input signal to prevent overheating the opto couplers In the following figures connections to open collector and difference controller are illustrated Controller R 0 if WOC 5 R 1R Pomer 0 1250 if WOC 12 R 28 Power 20 1258 if WOC 244 R must be connected te control signal terminal Figure 3 Connections to open collector signal common anode Con
5. User s Manual For 3225 Micro Microstepping Driver Version 2 0 2000 All Rights Reserved Attention Please read this manual carefully before using the driver Contents Table of Contents 1 Introduction Features and Applications x 04se uavttudetiuavttudetiarttadeteuauieds Introduction cccccccccceeeeeeees Features orrae ovedeeess Applications ccccccccccccsseeeees 2s SPECIMICALIOMNS reaa a A Electrical Specifications Operating Environment and Other Specifications cccccceceeeeeeeeeeeeeeeeeeeeeeees Mechanical Specifications Elimination of Heat 3 Pin Assignment and Description Connector P1 Configurations Selecting Effective Pulse Edge or Effective Level and Control Signal Mode Connector P2 Configurations 4 Control Signal Connector P1 Interface 00 0 cccccccceccceeeeeeeeeeeeeeeeeeeeeeseeseseeeeess 5 Connecting the Motor Connections to 4 lead Motors Connections to 6 lead Motors Half Coil Configurations Full Coil Configurations Connections to 8 lead Motors Series Connections Parallel Connections 6 Power Supply Selection Regulated or Unregulated Power Supply cccccccccccccccccceccceeceeeeeeeeeeeeeeeeeeeeeeeeeees Multiple Drivers 00 Selecting Supply Voltage 7 Selecting Microstep Resolution and Driver Outp
6. age the 3225 setting closest to your motor s required current Selecting Supply Voltage Dynamic Current Setting Si eal OFF ON ON Sasa ON OFF ON The power MOSFETS inside the 3225 can actually operate within 12V 24VDC including power input fluctuation and back EMF voltage generated by motor coils during motor shaft deceleration Higher supply voltage can increase motor torque at higher speeds thus helpful for OFF OFF ON are ee ON ON OFF Sra OFF ON OFF E ON OFF OFF a eel OFF OFF OFF Notes Due to motor inductance the actual current in the coil may be smaller than the dynamic avoiding losing steps However higher voltage may cause bigger motor vibration at lower speed and it may also cause over voltage protection or even driver damage Therefore it is suggested to choose only sufficiently high supply voltage for intended applications and it is suggested to use power supplies with theoretical output voltage of 12 20V leaving room for power fluctuation and back EMF 7 Selecting Microstep Resolution and Driver Output Current current setting particularly under high speed condition This driver uses a 6 bit DIP switch to set microstep resolution and motor operating current as shown below Standstill Current SW4 is used for this purpose OFF meaning that the standstill current is set to be half of the Dynamic Current Microstep Resolution selected dynamic current and ON meaning that standstill cur
7. art of this process you may have to disconnect the individual components that make up your system and verify that they operate independently It is important to document each step in the troubleshooting process You may need this documentation to refer back to at a later date and these details will greatly assist our Technical Support staff in determining the problem should you need assistance Many of the problems that affect motion control systems can be traced to electrical noise controller software errors or mistake in wiring Problem Symptoms and Possible Causes Microstep resolution setting is wrong Fault condition exists Motor phases may be connected in reverse Something wrong with motor coil Control signal is interfered Something wrong with motor coil Current setting is too small Acceleration is set too high Inadequate heat sinking cooling Current is set too high
8. e 40 RH 90 RH 60 when motor stops so as to decrease driver heating and motor heating a OE Max Recommend use side mounting to maximize heatsink area i 5 9m s Max r inoi won A EE a Weight o Approx 150 gram 5 3 oz The 3225 has two connectors connector P1 for control signals connections and connector P2 for power and motor connections The following tables are brief descriptions of the two connectors of the 3225 More detailed descriptions of the pins and related issues are presented in section 4 5 9 Connector P1 Configurations Contents Ous Series connect resistors for current lit iting when 12 OF TZ4V used Direction signal In single pulse mode this signal has low high voltage levels representing two directions of motor rotation in double pulse mode set by inside jumper J2 this signal is counter clock CCW pulse effective for high level or low level set by inside jumper J1 For reliable motion response DIR signal should be ahead of PUL signal by 5us at least 4 5V when DIR HIGH 0 0 5V when DIR LOW Please note that motion direction is also related to motor driver wiring match Exchanging the connection of two wires for a coil to the driver will reverse motion direction Enable signal This signal is used for enabling disabling driver High level for enabling driver and low level for disabling driver Usually left unconnected enabled Selecting Effective Pulse Edge
9. rent is set to be the same as the selected dynamic current Standstill Current half full Contents The current automatically reduced to 60 of the selected dynamic current 0 2 second after the last pulse Theoretically this will reduce motor heating to 36 due to P I R of the original value If the application needs a different standstill current please contact us 8 Wiring Notes In order to improve anti interference performance of the driver it is recommended to use twisted pair shield cable To prevent noise incurred in pulse dir signal pulse direction signal wires and motor wires should not be tied up together It 1s better to separate them by at least 10 cm otherwise the disturbing signals generated by motor will easily disturb pulse direction signals causing motor position error system instability and other failures Ifa power supply serves several drivers separately connecting the drivers is recommended instead of daisy chaining It is prohibited to pull and plug connector P2 while the driver is powered ON because there is high current flowing through motor coils even when motor is at standstill Pulling or plugging connector P2 with power on will cause extremely high back EMF voltage surge which may damage the driver 9 Typical Connections A complete stepping system should include stepping motor stepping driver power supply and controller pulse generator The following figures are two typical
10. troller R 0 if VOC SV ReiK Powerd 1250 if VOCe12v R 2K Powers 1250 if WOC 24V must be connected to control signal terminal Figure 4 Connections to difference control signal 5 Connecting the Motor The 3225 driver can drive any 2 pahse and 4 pahse hybrid stepping motors Connections to 4 lead Motors 4 lead motors are the least flexible but easiest to wire Speed and torque will depend on winding inductance In setting the driver output current multiply the specified phase current by 1 4 to determine the peak output current Contents P2 Figure 5 4 lead Motor Connections Connections to 6 lead Motors Like 8 lead stepping motors 6 lead motors have two configurations available for high speed or high torque operation The higher speed configuration or half coil is so described because it uses one half of the motor s inductor windings The higher torque configuration or full coil uses the full windings of the phases Half Coil Configurations As previously stated the half coil configuration uses 50 of the motor phase windings This gives lower inductance hence lower torque output Like the parallel connection of 8 lead motor the torque output will be more stable at higher speeds This configuration is also referred to as half chopper In setting the driver output current multiply the specified per phase or unipolar current rating by 1 4 to determine the peak output current Figure 6 6 lead motor half
11. uency up to 100 KHz Input signals TTL compatible and optically isolated Automatic idle current reduction 3 state current control technology for less motor heating 4 selectable microstep resolutions 1 2 4 8 PUL DIR amp CW CCW mode optional Suitable for 2 phase and 4 phase motors DIP switch current setting with 7 different values Small size 86 55 20mm 3225 Micro Microstepping Driver Manual V2 0 Contents a Mechanical Specifications unit mm 1 inch 25 4 mm Applications Suitable for a wide range of stepping motors from NEMA size 14 to 23 which used in various kinds of machines such as X Y tables labeling machines laser cutters engraving machines pick place devices and etc It s specially adapted to the applications desired with low vibration high speed and high precision 2 Specifications Electrical Specifications T 25 C Supply voltage 12 24 VDC _ Pulse input frequency 100 KHz Isolation resistance 500 MQ A Recommend use side mounting for better heat dissipation Operating Environment and Other Specifications Elimination of Heat Cooling Natural Cooling or forced cooling Driver s reliable working temperature should be lt 65 motor working temperature should Environment Kei aest a fog m corrosive gases be lt 800 Ambient Temperature 070 0 500 Recommend use automatic half current mode namely current automatically be reduced to Elun
12. ut Current cccccccceeeeeeeeeees Microstep Resolution Selection Contents Current OC LUNGS enaa n a E EE EEEE EEEE 9 Dynamo Ca nk SEMDE a eae a whan than eh ait shcnd bcdem on Reon 9 SLAs Cl ONEN g scans sannsaesscutnceescemadanecatnneadesacenncuen concen snanemssuetcvanes 9 PRR TG TOC BAS 0c en ts Co CS OE SE OE EE REE EAE RENT 10 9 Typical Connections yids se io esse eee TG 10 10 Sequence Chart oF Control S1Onals 1 20 2 6 0 cnc deta neater assent wet A 11 11 Frequently Asked Questions 0 00 000cccccsssesssesseeeseeeeeeeseeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 12 Problem Symptoms and Possible Causes ccccccccccccccceeeceeeeeeeeeseeeeeeseeeeseeeeess 12 3225 Micro Microstepping Driver Manual V2 0 1 Introduction Features and Applications Introduction The 3225 is a very small size high performance microstepping driver based on one of the most advanced technologies in the world today It s suitable for driving any 2 phase and 4 phase hybrid stepping motors By using advanced bipolar constant current chopping technique it can output more speed and power from the same motor compared with traditional drivers such as L R drivers Its 3 state current control technology allows coil currents to be well controlled with relatively smaller current ripple therefore less motor heating 1s achieved Features High performance Low cost Supply voltage up to 24VDC Output current up to 2 5A Pulse freq
13. y is considerably less than motor current For example two 3A motors can be well supplied by one power supply of 4A rating Multiple Drivers It is recommended to have multiple drivers to share one power supply to reduce cost if the supply Contents Microstep Resolution Selection Microstep resolution is set by SW 5 SW 6 of the DIP switch as shown in the following table OFF OFF Current Settings For a given motor higher driver current will make the motor to output more torque but at the same time causes more heating in the motor and driver Therefore output current is generally set to be such that the motor will not overheat for long time operation Since parallel and serial connections of motor coils will significantly change resulting inductance and resistance it is therefore important to set driver output current depending on motor phase current motor leads and l hods Ph i li fi IS 1 in selecti has enough capacity To avoid cross interference DO NOT daisy chain the power supply input connection methods Phase current rating supplied by motor manufacturer is important in selecting i h he selection al l ions Sine OF te davas dasad pense conecciones y oaae driver current however the selection also depends on leads and connections The first three bits SW1 2 3 of the DIP switch are used to set the dynamic current Select a Attention NEVER connect power and ground in the wrong direction as it will dam
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