manual (e-8078) - Excella Electronics
Contents
1. s better to use lower supply voltage to decrease noise heating and improve 18 Contents reliability 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supply only during the ON duration of the PWM cycle but not during the OFF duration Therefore the average current withdrawn from power supply is considerably less than motor current For example two 3A motors can be well supplied by one power supply of 4A rating Multiple Drivers It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 has enough capacity To avoid cross interference DO NOT daisy chain the power supply input pins of the drivers Instead please connect them to power supply separately Selecting Supply Voltage The power MOSFETS inside the M8078 can actually operate within 24 80VDC in2. and active at downward falling edge Jl t J2 j d J1 J2short circuit CW CCW mode and active at low level The fixed level Connector P2 Configurations Contents 4 Control Signal Connector P1 Interface The M8078 can accept differential and single ended inputs including open collector and PNP output The M8078 has 3 optically isolated logic inputs which are located on connector P1 to accept line driver control signals These inputs are isolated to minimize or eliminate electrical noises coupled onto the drive control signals Recommend use line driver control signals to increase noise immunity of the driver in interference environments In the following figures connections to open collector and PNP signals are illustrated Controller i Ver Figure 3 Connections to open collector signal common anode Controller ae A Re if VOSY ee Belk howerd 1259 if VOIN Re2k ower 1250 if VODr24 R sust be commected to control signal terminal Figure 4 Connection to PNP signal common cathode 5 Connecting the Motor The M8078 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 16 Contents determine the peak output current P2 B B Figure 5 4 lea
3. 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 B4 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 Figure 9 8 lead motor parallel connections 6 Power Supply Selection The M8078 can match medium and small size stepping motors from NEMA frame size 17 to 43 made by us or other motor manufactures around the world 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
4. User s Manual For E 8078 High Performance Micro stepping Driver Attention Please read this manual carefully before using the driver f EXCELLA ELECTRONICS 54 Annapurna Industrial Estate Tilak Road Ghatkopar East Mumbai 400 077 India Tel 91 22 21029911 Fax No 91 22 21029922 E Mail sales excellaelectronics com Website www excellaelectronics com Contents Table of Contents 1 Introduction Features and Applications cccccsesseseseeeeeesseesseessesseessessesseeseaas l MAA GI CTO e E A E E NE E E E l SAUT E o E E T A AET A E E E ETT l APPC ATON S e E E 13 DSC AO e E E TEE E A E E 13 Electrical Specification cases ccrisecccrcencesteccorzeactenenohevedessedenatsioasayedesegussaieentieedastecsem 13 Operating Environment and other Specifications ccccccccceecceeeeeeeeeeeeeeeees 13 Mechanical Se CLI CAL ONS erore EE E EEEE 14 Elimination of Heat nnenneenneersssrssssssrssrssersssssssrssssssssssssrsssrsssesesresneeseeereerree 14 3 Pin Assignment and Description ccccceecccecceceeseeeeeeseeeeseeeeeseeeeeeeeeseeseeseesseesseaaas 14 Connector P1 Configurations iecsccccscccanccvecceseceadeaatnebedddawnddavsusdonceddaatedesseaeeawiects 14 Selecting Effective Pulse Edge or Effective Level and Control Signal Mode 15 Connector P2 Configurations ccccccccccccccccecceceeeeeeeeeeeeeeeeeeeeeeeeeeseeseeeeeeseeeeeeeeees 15 4 Control Signal Connector P1 In
5. ceesseed EA O E 21 OL EY PICA C onne UL OM feos sc oes aches E abasaaca ae ualete N 21 LO Sequence Chartof Control Signals sss st a eae a eee ere 22 I E PROLEC HOM PUNCHIONS ariaren a a a 23 Short voltage and Over voltage protection cccccceeeesseeseeseeseeessessesseessesaaas 23 Overcurrent PrOlCOUON sissih lcd n act venanuisnlntentaaes dauaniahiaeaec teats 23 Short C met PLO CHOM senn a a 23 Over Temperature Prot ctiom rrisin nea i a Eaa 23 12 Frequently Asked Questions niea a E A 23 Problem Symptoms and Possible Causes ccccccccccccsccccceececcceeeeeeeeeeeeseeseeeeees 24 II M8078 Microstepping Driver Manual V1 0 1 Introduction Features and Applications Introduction The M8078 is a high performance microstepping drivers based on pure sinusoidal current control technology Owing to this advanced technology the driven motor can run with smaller noise lower heating smoother movement and have better performance at higher speed than most of the drivers in the markets It is suitable for driving 2 phase and 4 phase hybrid stepping motors Features High performance cost effective Supply voltage up to 75 VDC Output current up to 7 8A Pulse input frequency up to 200 KHz Pure sinusoidal current control technology TTL compatible and optically isolated input Automatic idle current reduction 16 selectable resolutions in decimal and binary up to 51 200 steps rev Suitable for 2 phase a
6. cluding 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 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 24 75VDC leaving room for power fluctuation and back EMF 7 Selecting Microstep Resolution and Driver Output Current This driver uses an 8 bit DIP switch to set microstep resolution and motor operating current as shown below Dynamic Current Wicrestep Resolution 142 3 45161 7 8 Standstill Current half full 19 Contents Microstep Resolution Selection 2 z O ign N ot ge en Nn e 5 Nn Nn ee o lt z N ON oe O h o J rg nN 2 Q gt o nN N gt 5 5 gt o x ga S oO 3 9 Ps aa ee ON ON ON ON ON ON OFF Z O Es i Z Z OFF Z OFF Z Z 2 z9 z5 OFF Z OFF Z Z OFF Z O gt i zZ OFF Current Settings to be such that the motor will not overheat for long time operation S
7. control signals connections and connector P2 for power and motor connections The following tables are brief descriptions of the two connectors More detailed descriptions of the pins and related issues are presented in section 4 5 9 Approx 570g 20 10 oz Connector P1 Configurations Contents DIR 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 active at 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 SV 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 Selecting Effective Pulse Edge or Effective Level and Control Signal Mode There are two jumpers J1 and J2 inside the M8078 specifically for selecting active pulse edge or effective level and control signal mode as shown in figure 2 Default setting is PUL DIR mode and upward rising edge active afe i t a Q a 2 ia b J1 short circuit J2 open circuit a J1 J2 open circuit PUL DIR mode and active at upward rising edge c J1 open circuit J2 short circuit CW CCW mode and active at high level The fixed level Figure 2 J1 and J2 jumpers PUL DIR mode
8. d 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 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 P2 Figure 7 6 lead motor full coil higher torque connections 17 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
9. e twisted pair shield cable To prevent noise incurred in PUL DIR signal pulse direction signal wires and motor wires should not be tied up together It is 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 Connection A complete stepping system should include stepping motor stepping driver power supply and controller pulse generator A typical connection is shown as figure 10 21 Contents Controller Reo if Votes RE KiPower i 125 i VOCmTIV Rezk PowereO125W if VOCezdy R must be connected to control signal terminal Figure 10 Typical connection 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 following diagram tat opi hme im High Levels 5V i I I I PUL PUL l High Lervrel 3 SF r Low Level 5Y
10. ince 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 connection methods Phase current rating supplied by motor manufacturer is important in selecting 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 setting closest to your motor s required current Dynamic current setting Contents Se OOOO a2A BAN OFF ON AMA or OFF ON STA ON ON OFF OFF ON OFF ON OFF OFF OFF OFF OFF Notes Due to motor inductance the actual current in the coil may be smaller than the dynamic current setting particularly under high speed condition Standstill current setting SW4 is used for this purpose OFF meaning that the standstill current is set to be half of the selected dynamic current and ON meaning that standstill current is set to be the same as the selected dynamic current The current automatically reduced to 60 of the selected dynamic current one 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 us
11. nd 4 phase motors Support PUL DIR and CW CCW modes Short voltage over voltage over current and over temperature protection M8078 Microstepping Driver Manual V1 0 Contents oo Mechanical Specifications unit mm 1 inch 25 4 mm Applications Suitable for a wide range of stepping motors from NEMA size 17 to 43 It can be used in various kinds of machines such as X Y tables labeling machines laser cutters engraving machines pick place devices and so on Particularly adapt to the applications desired with low noise low heating high speed and high precision 2 Specifications Electrical Specifications T 25 C a Front view b Side view Figure 1 Mechanical specifications Recommend use side mounting for better heat dissipation Elimination of Heat Operating Environment and other Specifications Driver s reliable working temperature should be lt 60 and motor working temperature should be lt 80 It is recommended to use automatic idle current mode namely current automatically reduce Environment Avoid dust oil fog and corrosive gases to 60 when motor stops so as to reduce driver heating and motor heating It is recommended to mount the driver vertically to maximize heat sink area Use forced cooling method to cool the system if necessary 40 RH 90 RH Humidity MALON 5 9m s Max 3 Pin Assignment and Description The M8078 has two connectors connector P1 for
12. stions In the event that your driver 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 part 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 23 Contents Problem Symptoms and Possible Causes Microstep resolution setting is wrong Fault condition exists Control signal is interfered Something wrong with motor coil Acceleration is set too high Inadequate heat sinking cooling Current is set too high 24
13. taris DEE sIRVCCH tp 5ps km Lor Level oo SV ENA EXA PUL DIR cw CCH Figure 11 Sequence chart of control signals Remark a tl 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 b t2 DIR must be ahead of PUL effective edge by 5us to ensure correct direction c t3 Pulse width not less than 1 5us d t4 Low level width not less than 1 5us 22 Contents 11 Protection Functions To improve reliability the driver incorporates some built in protections features Short voltage and Over voltage protection When power supply voltage is lower than 18VDC over voltage protection will be activated and power indicator LED will turn off When power supply voltage exceeds 94VDC over voltage protection will be activated and the Alarm indicator LED will turn on Over current Protection Protection will be activated when continuous current reaches to 16A Short Circuit Protection Protection will be activated in case of short circuit between motor coils or between motor coil and ground Over Temperature Protection Protection will be activated when driver temperature reaches to 75 When above protections are active the motor shaft will be free or the Alarm LED will turn on except short voltage protection Reset the driver by repowering it to make it function properly after removing above problems 12 Frequently Asked Que
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