User`s Manual - MJ Cnc Automation
Contents
1. This driver uses an 8 bit DIP switch to set microstep resolution and motor operating current as shown below Current during motion Microstep resolution Mandil Current half full 7 1 Microstep Resolution Selection Microstep resolution is set by SW5 6 7 8 of the DIP switch as shown in the following table Microstep ustep rev for 1 8 motor SW5 SW6 SW7 SW8 2 400 on on on on 4 800 on ofi on on 8 1600 on on off on 16 3200 on ofi off on 32 6400 on on on off 64 12800 on ofi on off 128 25600 on on off off 256 51200 on off off off 5 1000 off on on on 10 2000 off ofi on on 25 5000 off on off on 50 10000 off off off on 125 25000 off on on off 250 50000 off off on off 12 8078 High Performance Microstepping Driver V1 2 7 2 Current Setting The first three bits SW1 2 3 of the DIP switch are used to set the current during motion dynamic current Select a setting closest to your motor s required current DIP Setting for current during motion 8078 sw1 sw2 SW3 2 8A on on on 3 5A off on on 4 2A on off on 4 9A off off on 5 7A on on off 6 4A off on off 7 0A on off off 7 8A off off off Remarks 1 Due to motor inductance the actual current in the coil may be smaller than the dynamic current settings particularly at higher speeds 2 Static current setting The current automatically reduce2. C Humidity 40 0 90 RH Vibration 5 9m s Max Storge Temp 20 C 65 C Weight About 0 44kg Mechanical Dimensions Side View 4 eng ZY 112 Figure 1 Mechanical dimensions 8078 High Performance Microstepping Driver V1 2 3 Driver Connectors P1 and P2 The driver has two connectors P1 for control signals and P2 for power and motor connections The following is a brief description of the two connectors of the driver More detailed descriptions of the pins and related issues are presented in section 4 5 6 9 Control Signal Connector P1 pins Pin No Signal Functions 1 Pull 45V 2 Pul pulse Pulse signal in single pulse pulse direction mode this input represents pulse signal effective for each upward rising edge in double pulse mode pulse pulse this input represents clockwise CW pulse For reliable response pulse width should be longer than 3vs Dir 5V Dir Dir 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 JMPI this signal is counter clock CCW pulse effective on each rising edge For reliable motion response direction signal should be sent to driver 2vs before the first pulse of a motion direction reversal Ena 5V Ena Ena Enable signal this signal is used for enable disable high
3. F2 P Am kr ae n a Tt E i Bs H fie E ii fi Bleed dite Faal Counrreers fled biro Sores CHraciera i Pa pla Toma a hh oe ot ee Tae can cd H Sad Werin load Figure 3 Driver Connection to Step Motor Note that when two coils are parallelly connected coil inductance is reduced by half and motor speed can be significantly increased Serial connection will lead to increased inductance and thus the motor can be run well only at lower speeds 5 1 Connecting 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 Connection 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 Use the per phase or unipolar current rating as the peak output current or multiply the bipolar current rating by 1 4 to determine the peak output current 8078 High Performance Microstepping Driver V1 2 PHASE A PHASE A PT PHASE B Figure 4 8 Lead Motor Series Connections Parallel Connection 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 ratin
4. level for enabling driver and low level for disabling driver Usually left unconnected enabled Remark 1 Pul dir is the default mode under cover jumper JMP1 can be used to switch to CW CCW double pulse mode Remark 2 Please note 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 for example reconnecting motor A to driver A and motor A to driver A will invert motion direction 8078 High Performance Microstepping Driver V1 2 Power connector P2 pins Pin No Signal Functions 1 Gnd DC power ground 2 V DC power supply 18VDC 80VDC Including voltage fluctuation and EMF voltage 3 4 Phase A Motor coil A leads A and A 5 6 Phase B Motor coil B leads B and B 4 Control Signal Connector P1 Interface This driver uses differential inputs to increase noise immunity and interface flexibility Single ended control signals from the indexer controller can also be accepted by this interface The input circuit has built in high speed opto coupler and can accept signals in the format of line driver open collector or PNP output Line driver differential signals are suggested for reliability In the following figures connections to open collector and PNP signals are illustrated l Controller Driver Open collector YCC FUL 2700 signal common f
5. SE B Ni DME TION PHASE B Figure 7 6 Lead Full Coil Higher Torque Motor 8078 High Performance Microstepping Driver V1 2 5 3 Connection 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 PHASE A O PHASE A PHASE B PHASE B Figure 8 4 Lead Motor Connections 6 Power supply Selection Driver Voltage and Current Selection 6 1 Power Supply Selection It is important to choose appropriate power supply to make the driver operate properly and deliver optimal performance Maximum Voltage Input The power MOSFETS inside the driver can actually operate within 18V 80VDC including power input fluctuation and back EMF voltage generated by motor coils during motor shaft deceleration Higher voltage will damage the driver Therefore it is suggested to use power supplies with theoretical output voltage of no more than 95V leaving room for power line fluatuation and Back EMF Regulated or Unregulated power supply Both regulated and unregulated power supplies can be used to supply DC power to the driver However unregulated power supplies are preferred due to their ability to withstand current surge If regulated power supply such as most switching supplies is indeed used it is important to have large current output rat
6. User s Manual For 8078 High Performance Microstepping Driver Version 1 0 2000 All Rights Reserved Attention Please read this manual carefully before using driver 8078 High Performance Microstepping Driver V1 2 Table of Contents Introduction Features and Applications ssssssssseseteseeseseseseeeseseeteeeeeeeneenees 2 Specifications and Operating Environment s 1sssseeeeseeseseseseseeeeeeeeeeeeeeneenees Driver Connectors P1 and P2 1seeeeeeeeeeeeeeeees Control Signal Connector P1 Interface Driver Connection to Motors P2 eesse Power Supply and Driver Voltage and Current Selecting Microstep Resolution and Driver Current Changing Microstep Resolution on the fly etere Connection Diagram for Driver Motor Controller 0 Control Signal Waveform and Timing PPPE PIE sia sevsvadseceds sun aiastececesissin aca svediaunssieaes SF OwmrIaAnbRWNe 1 Introduction Features and Applications 8078 are high performance microstepping driv ers based on most advanced technology in the world today They are suitable for driving any 2 phase and 4 phase hybrid step motors By using advanced bipolar constant current chopping technique they can output more speed and power from the same motor compared with traditional technologies such as L R drivers Its 3 state current control technology allows coil currents to be well controlled with relatively small current rip
7. d to 60 of dynamic current setting 1 second after the last pulse This will theoretically reduce motor heating to 36 due to I I of the original value If the application needs a different idle current please contact Leadshine for minor modification of circuit DIP setting for current during standstill SW4 is used for this purpose current setting due to coil inductance OFF meaning that the standstill current is set to be half of the dynamic current and ON meaning that standstill current is set to be the same as dynamic current 13 8078 High Performance Microstepping Driver V1 2 8078 High Performance Microstepping Driver V1 2 8 Protection Functions To improve reliability the driver incorporates a number of built in protections features a Over voliage protection When power supply voltage exceeds 80VDC protection will be activated and power indicator LED will turn red When power supply voltage is lower than 18VDC the driver will not works properly b Coil ground Short Circuit Protection Protection will be activated in case of short circuit between motor coil and ground c Over current Protection Protection will activated in case of short current which may otherwise damage the driver Attention since there is no protection against power leads reversal it is critical to make sure that power supply leads are correctly connected to driver Otherwise the driver will be damaged instantly 9 Co
8. e good driving results it is important to select supply voltage and output current properly Generally 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 Selecting Supply Voltage Higher supply voltage can increase motor torque at higher speeds thus helpful for avoiding losing steps However higher voltage may cause more motor vibration at lower speed and it may also cause over voltage protection and even driver damage Therefore it is suggested to choose only sufficiently high supply voltage for intended applications Setting Proper Output Current a Fora 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 b 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 connection methods 11 8078 High Performance Microstepping Driver V1 2 c Phase current rating supplied by motor manufacturer is important to selecting driver current but the selection also depends on leads and connection 7 Selecting Microstep Resolution and Driver Current Output
9. e i D gnal am B k 200 i aT e aK I Direc han steal D i I 2700 I I ae i Enabk sgnal E _ A Ee ERA R n w WCC Su i l R 550 W WEC 0 i k R 1 5k n YCC 2a De E E j Not bat R kork be ce relkrconmece dD the controler s gial Pul DIr Ena 3 hea of vlc 8078 High Performance Microstepping Driver V1 2 PNP output common anode vec Pulse signal ree caper FUL 2700 J i B lt D I n E k 5 Controller yec PUL Direction signal Direction signal R DIR 2700 Driver a u Pia YCC mabla signal Enable signal aes ENAt l E E ia R it vod 8V Fh es ea le ay R 550 it YCC 176 See RASk it VOD aay Mote tat R miould be eral sonnented bo te controller gnali Ful Or Ena jinitead of Woo Figure 2 Signal Interface Single Pulse and Double Pulse Modes There is a jumper JMPI inside the driver specifically for the purpose of selecting pulse signal mode settings for one pulse mode pulse dir and for double pulse double pulse mode gt mode CW CCW are shown on the left Ferre Jumper 000000 000000 070 0 080 a mode out of factory is one pulse one pulse mode 8078 High Performance Microstepping Driver V1 2 5 Driver Connection to Step Motors 8078 driver can drive any 4 6 8 lead hybrid step motors The following diagrams illustrate connection to various kinds of motor leads P2
10. g by 1 96 or the bipolar current rating by 1 4 to determine the peak output current Figure 5 8 Lead Motor Parallel Connections 5 2 Connection 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 use the full windings of the phases 8078 High Performance Microstepping Driver V1 2 Half Coil Configuration 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 bal copper In setting the driver output current multiply the specified per phase or unipolar current rating by 1 4 to determine the peak output current PHASE A i CONNECTE PHASE B O PHASE B O HO COMHECTOH Figure 6 6 Lead Half Coil Higher Speed Motor Connections Full Coil Confuguration 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 Use the per phase or unipolar current rating as the peak output current PALS A hi SOMME CT OM PHASE A PHA
11. ing to avoid problems like current clamp for example using 4A supply for 3A motor driver operation On the other hand if unregulated supply is 10 8078 High Performance Microstepping Driver V1 2 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 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 provided that the supply has enough capacity To avoid cross interference DO NOT dazy chain the power supply input pin of the drivers connect them to power supply separately 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 improve noise heating and reliability NEVER connect power and ground in the wrong direction as it will damage the driver 6 2 Driver Voltage and Current Selection This driver can match small and medium size step motors NEMA 34 and 43 made by Leadshine or other motor manufactures from around the world To achiev
12. nnection Diagram for Driver Motor Controller A complete stepping system should include stepping motor stepping driver power supply and controller pulse generator A typical connection is shown below Figure 9 Driver connection in a stepping system 10 Control signal Waveform and Timing This driver can accept pulse control signals up to 500khz Before a direction reversal direction signal needs to be established at least 2 us before the first pulse of the next pulse train Please examine time diagrams of the three control signals as follows 14 PUL Pulse signal Ico susah gt s f PiE 1 I ENA Enable signal 15
13. ple and results in less motor heating Features of this driver High performance low cost Supply voltage up to 80VDC current to 7 8A Inaudible 20khz chopping frequency TTL compatible and optically isolated input signals Automatic idle current reduction Mixed decay current control for less motor heating 14 selectable resolutions in decimal and binary Microstep resolutions up to 51 200 steps rev Suitable for 4 6 8 lead motors Over current over voltage and short circuit protection Small size 119 x 97 x 48mm Applications of this driver Suitable for a wide range of stepping motors of size Nema 34 and 43 and usable for various kinds of machines such as X Y tables labeling machines laser cutters engraving machines and pick place devices particularly useful in applications with low vibration high speed and high precision requirements 8078 High Performance Microstepping Driver V1 2 2 Specifications and Operating Environment Electric Specifications T 25 C 8078 Parameters Min Typical Max Remark Peak Output Current 2 8A by user 7 8A By DIP switch Supply voltage DC 18V 68V 80V Logic signal current 10mA 12mA 18mA Pulse input frequency 0 By user 300Khz Isolation resistance 500MQ Operating Environment and Parameters Cooling Natural cooling or forced convection Environment Space Avoid dust oil frost and corrosive gas Temperature 0 J 50
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