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MD2278

1. unipolar current rating as the peak output current uG CONECTION PHASE B Figure 7 6 Lead Full Coil Higher Torque Motor 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 MD2278 High Performance Microstepping Driver V1 0 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 80 220VAC 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 220V 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 u
2. valid Generally ENA and ENA is NC not connected 2 t2 DIR must be ahead of PUL effective falling edge by Sus to ensure correct direction 3 t3 Pulse width not less than 1 2us 4 t4 low level width not less than 1 2us 11 Wire Connection 1 2 3 4 In order to improve driver noise rejection it is recommended to use twist ed 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 is better to separate them by at least 10 cm otherwise the motor noise will easily disturb pulse direction signals motor position error system instability and other types of failure If a power supply serves several drivers separate connections drivers is recommended instead of daisy chaining It 1s prohibited to pull and plug connector P2 while driver is powered ON as there is still high current flowing through coil even when motor is stopped Pulling and plugging P2 with power on will cause extremely high voltage surge EMF destroy the dirver 14 MD2278 High Performance Microstepping Driver V1 0 TWELVE MONTH LIMITED WARRANTY FULLING MOTOR Co Ltd warrants its products against defects in materials and workmanship for a period of 12 months from receipt by the end user During the warranty period FULLING will either at its option repair or replace products which prove to be defective EXCLUSIONS The above warranty shall not
3. User s Manual For MD2278 High Performance Microstepping Driver Version 1 0 2000 All Rights Reserved Attention Please read this manual carefully before using driver The content in this manual has been carefully prepared and is believed to be accurate but no responsibility is assumed for inaccuracies FULLING reserves the right to make changes without further notice to any products herein to improve reliability function or design FULLING 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 of others FULLING s general policy does not recommend the use of its products in life support or aircraft applications wherein a failure or malfunction of the product may directly threaten life or injury According to FULLING s terms and conditions of sales the user of FULLING s products in life support or aircraft applications assumes all risks of such use and indemnifies FULLING against all damages MD2278 High Performance Microstepping Driver V1 0 Table of Contents 1 Introduction Features and Applications TET E E T E E ea bsguees sence 2 2 Specifications and Operating Environment 6eeeeeeeeeteeetetetetettetesestssersittese nenet 3 3 Driver Connectors P1 and acento ed arenes rns nero tenants ace adasee nee eeeoes reaeane 4 A Control Signal Connector P D Interface s ts sss s sereeves svsvanssnsessenses
4. Zhou city JiangSu Province China Also enclose information regarding the circumstances prior to product failure 15
5. ansnosoanvscesseneceuenness 5 5 Driver Connection to Motors P2 seessesresressesseeressesressesresressessenrensensenreeresseeresseeresseens 6 6 Power Supply and Driver Voltage and Current eescseeseteeeeeteeeteteneeeeee 9 7 Selecting Microstep Resolution and Driver Current Output sss2eseeeee eee 11 amp Protection FUNCIONS lt t s4 lt ctswettecatersavecaeestecadencevedewsaasscdewiarsesuwaie sedendaveduweesesedewsassoenaadeus 12 9 Connection Diagram for Driver Motor Controller eeestis 13 10 Control Signal Waveform and Timing istsesssniassiesnsnvatsncennssasstansveevtevesiebsureanecsnen tans 13 1i Wire Clavie Tort Coreen eee eee te ee ee ern errr 14 Appendix Limited Warrant ty eserinin eor rea a 15 1 Introduction Features and Applications MD2278 are high performance microstepping drivers incorporating the most advanced technology in the world today They are suitable for driving any 2 phase and 4 phase hybrid step motors current 7 8A 3 9A By using advanced bipolar constant current chopping technique they can produce more motor torque at high speed than other drivers The microstep capability allows stepping motors run at higher smoothness less vibration and lower noise The 3 state current control feature leads to lower motor heating Features of this driver High quality low price Low heating for motor amp driver Supply voltage AC80 250V TTL compatible inputs Automatic idle current re
6. apply to defects resulting from improper or inadequate handling by customer improper or inadequate customer wiring unauthorized modification or misuse or operation outside of the electrical and or environmental specifications for the product OBTAINING WARRANTY SERVICE To obtain warranty service a returned material authorization number RMA must be obtained from customer service at e mail before returning product for service Customer shall prepay shipping charges for products returned to FULLING for warranty service and FULLING shall pay for return of products to customer WARRANTY LIMITATIONS FULLING makes no other warranty either expressed or implied with respect to the product FULLING specifically disclaims the implied warranties of merchantability and fitness for a particular purpose Some jurisdictions do not allow limitations on how long and implied warranty lasts so the above limitation or exclusion may not apply to you However any implied warranty of merchantability or fitness is limited to the 12 month duration of this written warranty Shipping Failed Product If your product should fail during the warranty period e mail customer service at to obtain a returned material authorization number before returning product for service Please include a written description of the problem along with contact name and address Send failed product to distributor in your area or Changzhou Fulling motor Co Ltd 66 Zhujiang Road Chang
7. arks Due to motor inductance the actual current in the coil may be smaller than the dynamic current settings particularly at higher speeds E i m n amcre k REg El a ee Static current The current automatically reduced to 60 of dynamic current setting 0 2 second after the last E a pulse this will theoretically reduce motor heating to 36 due to I I of the original value es DIP setting for pulse mode SWS is used for this purpose ON means CW CCW mode OFF means PUL DIR mode 8 Protection Functions e Over voltage short voltage over current over heating and short circuit protection _FE To improve reliability the driver incorporates a number of built in protections features Figure 9 Driver connection in a stepping system a Over voltage protection and short voltage protection When power supply voltage exceeds 250VAC protection will be activated and power indicator LED will turn red When power supply voltage is lower than 80VAC the driver will not works 10 Control signal Waveform and Timing properly In order to avoid some fault operation and deviation PUL DIR and ENA must accord with some b Coil ground Short Circuit Protection parameters as following diagram Protection will be activated in case of short circuit between motor coil and ground 12 13 Remark MD2278 High Performance Microstepping Driver V1 0 m wR 1 tl ENA must be ahead of DIR by at least Sus logic HIGH as
8. duction Output current up to 7 8A peak RMS 5 57A Input frequency up to 400KHz Opto isolated inputs Microstep resolution pulse per rotation selectable vary from 400 500 600 800 1000 1200 1600 2000 2400 3200 4000 5000 6000 6400 8000 and 10000 Suitable for any 2 phase stepping motor with 4 6 8 leads DIP switch current setting CW CCW mode available optional MD2278 High Performance Microstepping Driver V1 0 Applications of this driver Applicable for automated machinery and equipment for instance air driven inscription machines labeling machines cutting machines laser engraving plotter medical instruments and pick place devices 2 Specifications and Operating Environment Electric Specifications T 25 C MD2278 Parameters Typical Output Current 0 42 RMSO 3A 78 Amps Supply voltage DC 80 180 250 VAC Pulseinput frequency o 400 Ke Isolation resistance 500 doo y dai O Operating Environment and Parameters Environment 0 50 C Mechanical Dimensions unit mm 1 inch 25 4 mm Front View Side View Figure 1 Mechanical dimensions Recommended to use side mounting for better heat dissipation MD2278 High Performance Microstepping Driver V1 0 Extra Heat Sink Driver s reliable working temperature should be lt 65 C motor temperature 80 C It is recommended automatic half current mode i e current automatically reduced by 60 when motor stops so a
9. id step motors The following diagrams illustrate connection to various kinds of motor leads Pi if m Bl ead bbin Fa akd anrr Sees ELosi hiroa bara Cone Tifl Ee Lahi P2 E Laai hee F ma Ani nH b Lial bed Di bis ME h L mi ra lee 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 PHASE A PHASE A PHASE B os PHASE H a Figure 4 8 Lead Motor Series Connections MD2278 High Performance Microstepping Driver V1 0 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 ind
10. lecting Microstep Resolution and Driver Current Output This driver uses a 9 bit DIP switch to set microstep resolution motor operating current and pulse mode selection as shown below resolution setting current setting oo P Pel an el PULA DIE and CRYCCH selection 7 1 Microstep Resolution Selection Microstep resolution is set by SW1 SW4 of the DIP switch as shown in the following table ustep rev for 1 8 motor 7 2 Current Setting The SW6 SW9 of the DIP switch are used to set the current during motion dynamic current Select a setting closest to your motor s required current 11 MD2278 High Performance Microstepping Driver V1 0 MD2278 High Performance Microstepping Driver V1 0 DIP Setting for current during motion c Over current Protection MD2278 DIP switch setting Protection will activated in case of short current which may otherwise damage the driver Peak current A RMS A swe __ _sw7__ swe __ _swe__ 0 45 Attention since there is no protection against power leads reversal it is critical to OFF OFF OFF make sure that power supply leads correctly connected to driver Otherwise the driver will be 1 41 damaged instantly 188 __ 4 34 ae ee ee ee 9 Connection Diagram for Driver Motor Controller A complete stepping system should include stepping motor stepping driver power supply and ie A typical connection is shown below T o ome 6e an o o oF N Rem
11. mum permitted input voltage 30VDC maximum output current 20mA generally can be serial connected to PLC input terminal READY Output alarm signal negative Remark 1 SWS ON means PUL DIR mode OFF means CW CCW pulse 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 MD2278 High Performance Microstepping Driver V1 0 Power connector P2 pins AC input varies from 80V to 220V recommended to use 180V E Motor coil A leads A and A Motor coil B leads B and B P Connect ground terminal 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 Controller Wee Driver PUL signal MD2278 High Performance Microstepping Driver V1 0 5 Driver Connection to Step Motors MD2278 driver can drive any 4 6 8 lead hybr
12. or other motor manufactures from around the world To achieve 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 oOver 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 c Phase current rating supplied by motor manufacturer is important to selecting driver current but the selection also depends on leads and connection 10 MD2278 High Performance Microstepping Driver V1 0 7 Se
13. s to decrease driver and motor s heating Please mount the driver vertically to maximize heat sink area 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 PULL 5V Pulse signal in single pulse pulse direction mode this input represents PUL PUL 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 1 5us DIR 4 5V Direction signal in single pulse mode this signal has low high voltage levels representing two directions of motor rotation in double pulse DIR DIR mode set by inside jumper JMP1 this signal is counter clock CCW pulse effective on each rising edge For reliable motion response direction signal should be sent to driver 2us before the first pulse in the reverse motion direction Enable signal this signal is used for enable disable high level for ENA ENA enabling driver and low level for disabling driver Usually left unconnected enabled READY Output alarm signal positive READY is a photocouper output from open collector circuit effectively output when driver operate normally maxi
14. sed 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 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 MD2278 High Performance Microstepping Driver V1 0 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 instead please 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 43 and 51 made by FULLING
15. uctance 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 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 balf 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 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 confi8guration 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 MD2278 High Performance Microstepping Driver V1 0 PHASE X PHASE i PHASE Ff PHASE B O HO CONNECT 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

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