Anaheim Stepper MBC25081TB Users Guide

							MBC25081TB Series
Bipolar Microstep Driver 
User’s Guide
910 East Orangefair Lane, Anaheim, CA 92801
e-mail: [email protected](714) 992-6990  fax: (714) 992-0471
website: www.anaheimautomation.com
ANAHEIM AUTOMATION
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							General Description
The MBC25081TB is a 2.5 amps/phase bipolar microstep driver capable of running four, six and eight lead 
step motors.  The MBC25081TB has an output current range of 0.5 to 2.5 amps/phase and operates off 
12VDC minimum to 24VDC maximum.  The inputs are capable of running from either open collector or 
TTL level logic outputs, or sourcing 24VDC outputs from PLCs.  The MBC25081TB features resolutions 
from 200-1600 steps/revolution, providing smooth rotary operation, built in over temperature and short 
circuit shut down, automatic 70% reduction in current after clock pulses\
 stop being received, and status 
LED’s to indicate power on (green LED) and clocks being received (yellow LED).  The MBC25081TB is 
a compact, low profile package meant to be used where space is limited but performance is expected.
MBC25081TB Driver Features
• 2.5 Amps/Phase Output Current
• Bipolar Microstepping Drive Operation
• Over Temperature and Short Circuit Shutdown
• Microstep Divisors of 8, 4, 2, or Full Step
• Compact Package: 3.10” x 2.26” x 0.92”
• 12-24VDC Power Requirement
• Accepts TTL Logic or 24V Level Inputs
• Ideal for Precise Positioning
• Efficient and Durable 
• Long Life Expectancy
Dimensions
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Ordering InformationPart Number Description
MBC25081TB 12-24VDC, 0.5-2.5A Bipolar Microstep Driver, Package with Heat Sink and detach
-
able terminal blocks
MBC25081 12-24VDC, 0.5-2.5A Bipolar Microstep Driver, Package with Heat Sink
MBC15081 12-24VDC,0.3-1.5A Bipolar Microstep Driver, Open-Frame
PSAM24V2.7A 24V @ 2.7A Universal Input Power Supply
Hook-Up Diagram
Input Pin Descriptions
Pin # Description
1 Direction
2 Clock
3 On/Off
4 MS2
5 MS1
6 12VDC-24VDC
7 0VDC (Gnd)Motor Pin Descriptions
Pin # Description
1 Phase A
2 Phase Ā
3 Phase B
4 Phase B 
Control Inputs (Pins 1, 2, 3, 4, 5):
Microstep Resolution Truth Table
MS1 MS2Resolution
Active ActiveFull Step
Inactive (Open) ActiveHalf Step
Active Inactive (Open) Quarter Step
Inactive (Open) Inactive (Open) Eighth StepDirection:  Logic “1” CW
    Logic “0” CCW
Clock:   Active - 1 Step
    Inactive (open) - Reduce
  Current Mode
On/Off:   Active - Off
    Inactive (open) - On
Notes:
Open Inputs are inactive and internally pulled 
up to +5VDC for JP1 position 1-2 (Sinking)  
Open Inputs are inactive and internally pulled 
down to 0VDC for JP1 position 2-3 (Sourcing)
A. Minimum Command Active Time Before 
Clock Pulse (Data Set-Up Time)...200nS
B. Minimum Command Active Time After Clock 
Pulse (Data Hold Time)
C. Minimum CLOCK Pulse Width.......1.0uS
D. Minimum CLOCK Inactive Time.......1.0uS
Maximum CLOCK Frequency................500kHz
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							With JP1 in position 1-2 (sinking) the inputs are considered inactive or Logic “1” if left open, or active or 
Logic “0” if grounded.   With JP1 in position 2-3 (sourcing) the inputs are considered inactive or Logic “0” 
if left open, and active or Logic “1” if pulled to 3.5 - 24VDC.
Setting the Output Current:
The output current on the MBC25081TB is set by the onboard potentiometer.  This potentiometer deter-
mines the per phase peak output current of the driver.  The relationship between the output current and 
the potentiometer value is as follows:
Warning! Step motors will run hot even when configure correctly.  Damage may occur to the motor if a 
higher than specified current is used.  Most specified motor currents are maximum values.  Care should 
be taken to not exceed these ratings.
Reducing Output Current
Reducing the output current is accomplished automatically and occurs approximately 20mSec after the last 
clock input has been received.  The amount of current per phase in the reduction mode is approximately 
70% of the set current.  When the current reduction circuit is activated, the current reduction resistor is 
paralleled with the current adjustment potentiometer.  This lowers the total resistance value, and thus 
lowers the per phase output current.
Connecting the Step Motor
Phase  1  and  Phase  3  of  the  step  motor  are  connected  to  pins  1  and  2  on  connector  P2.  Phase  2  and 
Phase 4 of the step motor are connected to pins 3 and 4 on connector P2.  Please refer to the figure for 
a TYPICAL APPLICATION HOOK-UP.
Note: The physical direction of the motor with respect to the direction input will depend on the connection 
of the motor windings.  To reverse the direction of the motor with respect to the direction input, switch the 
wires on Phase 1 and Phase 3.
WARNING: DO NOT CONNECT OR DISCONNECT MOTOR WIRES WHILE POWER IS APPLIED!
Motor Selection
The MBC25081TB is a Bipolar Microstep Driver that is compatible with both Bipolar and Unipolar Motor 
Configurations, (i.e. 8 and 4 lead motors, and 6 lead center tapped motors).
Step motors with low current ratings and high inductance will perform better at low speeds, providing 
higher low end torque.  Motors with high current ratings and low inducta\
nce will perform better at higher 
speeds, providing more high-end torque.
Since the MBC25081TB uses a constant current source drive technique, it is not necessary to use a mo-
tor that is rated at the same voltage as the supply voltage.  What is important is that potentiometer is set 
to the appropriate current level based on the motor being used.  Higher voltages will cause the current to 
flow faster through the motor coils.  This in turn means higher step rates can be achieved.  Care should 
be taken not to exceed the maximum voltage of the driver.
Peak 
Current Potentiometer 
Setting Peak 
Current Potentiometer 
Setting
0.50A 0%1.70A 60%
0.70A 10%1.90A 70%
0.90A 20%2.10A 80%
1.10A 30%2.3090%
1.30A 40%2.50A 100%
1.50A 50% ------MBC25081TB Potentiometer Settings
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							Step Motor Configurations
Step motors can be configured as 4, 6, or 8 leads.  Each configuration requires different currents.  Refer 
to the lead configurations and the procedures to determine their output current.
Determine Output Current
The output current for a motor used with a bipolar driver is determined differently from that of a unipolar 
driver.  In the MBC25081TB, a sine/cosine output function is used in rotating the motor.  The output current 
for a given motor is determined by the motors current rating and the wiring configuration of the motor.  There 
is a current adjustment potentiometer used to set the output current of \
the MBC25081TB.  This sets the 
peak output current of the sine/cosine waves.  The specified motor current (which is the unipolar value) is 
multiplied by a factor of 1.0, 1.4, or 2.0 depending on the motor configuration (series, half-coil, or parallel).
6 Lead Motors
Half-Coil Connection: When configuring a 6 lead motor in half-coil (connected from one end of the coil 
to  the  center  tap),  multiply  the  specified  per  Phase  (or  unipolar)  current  rating  by  1.4  to  determine  the 
current setting potentiometer value.  This configuration will provide more torque at higher speeds when 
compared to the series configuration.
Series: When configuring the motor in series (connected from end to end with the center tap floating) use 
the specified per Phase (or unipolar) current rating to determine the current setting potentiometer value.
8 Lead Motors
Series Connection:  When configuring the motor windings in series, use the per Phase (or unipolar) cur-
rent rating to determine the current setting potentiometer value.
Parallel Connection: When configuring the motor windings in parallel, multiply the per Phase (or unipolar) 
current rating by 2.0 to determine the current setting potentiometer val\
ue.
4 Lead Motors
Series Connection: Multiply the specified series motor current by 1.4 to determine the current adjustment 
potentiometer value.  Four Lead Motors are usually rated with their appropriate series current, as opposed 
to the Phase Current , which is the rating for 6 and 8 lead motors.
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							ANAHEIM AUTOMATION
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Copyright 2007 by Anaheim Automation. All rights reserved. No part of this publication may be reproduced, 
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written permission of Anaheim Automation, 910 E. Orangefair Lane, Anaheim, CA 92801. 
DISCLAIMER
Though every effort has been made to supply complete and accurate information in this manual, the 
contents are subject to change without notice or obligation to inform the buyer. In no event will Anaheim 
Automation be liable for direct, indirect, special, incidental, or conse\
quential damages arising out 
of the use or inability to use the product or documentation.   
Anaheim Automation’s general policy does not recommend the use of its’ products in life support applications 
wherein a failure or malfunction of the product may directly threaten life or injury.  Per Anaheim Automation’s 
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risks of such use and indemnifies Anaheim Automation against all damages.
LIMITED WARRANTY
All Anaheim Automation products are warranted against defects in workmanship, materials and construction, 
when used under Normal Operating Conditions and when used in accordance with specifications. This 
warranty shall be in effect for a period of twelve months from the date of purchase or eighteen months 
from the date of manufacture, whichever comes first.  Warranty provisions may be voided if products 
are subjected to physical modifications, damage, abuse, or misuse.
Anaheim Automation will repair or replace at its’ option, any product which has been found to be defective 
and is within the warranty period, provided that the item is shipped freight prepaid, with previous authorization 
(RMA#) to Anaheim Automation’s plant in Anaheim, California. 
TECHNICAL SUPPORT
If you should require technical support or if you have problems using any of the equipment covered by this 
manual, please read the manual completely to see if it will answer the questions you have. If you need 
assistance beyond what this manual can provide, contact your Local Distributor where you purchased the 
unit, or contact the factory direct.
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