Anaheim Stepper BLD751 Users Guide

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Troubleshooting
If a fault occurs, reset the fault by applying a logic “0” to the Reset Fault Input (pin 4) for at least 100ms 
or by cycling power off for at lest 15 seconds.  After resetting, try to run the motor again.  If the driver 
continues to fault, check the conditions listed below.
Short (One Blink)
This indicates that the driver or motor has a phase shorted or there is a “short” in the motor cable or wir-
ing.  Check the motor and the physical wiring for shorts.  If the driver continues to sense shorts after the 
motor and wiring are determined to be accurate, then the output transistors should be checked using a 
multimeter as follows:
1.  Set the multimeter to diode test.
2.  Place the red lead on the ground (pin 7).
3.  Touch the black lead to each phase (pins 1, 2, 12, and 13).
4.  This should give readings between 0.450V and 0.550V.
5.  If any readings are signifi cantly less than 0.450V, then the unit has been damaged.
Open (Two Blinks)
This indicates that there is an “open” or intermittent connection in one of the motor wires.  Check motor 
and the wiring for opens.  Another condition that may cause this type of fault, is when a large motor is 
ramped down too quickly and it loses it position (stalls).
High Voltage Too High (Three Blinks)
This indicates that the input voltage of the transformer is too high.  Check the input voltage of the trans-
former to see if it is within the specifi ed range.
Low Voltage Too Low (Four Blinks)
This indicates that there is an excess amount of current being pulled from the driver or the input voltage 
to the transformer is too low to provide the amount of current needed by the low voltage winding.  Check 
the input voltage of the transformer to see if the voltage is within the specifi ed range.
Over Temperature (Five Blinks)
This is caused by the heat sink reaching a temperature of 80°C.  Make sure proper ventilation or an ad-
ditional heat sink is provided so the temperature does not reach this level.
If a factory repair is required, contact Anaheim Automation for a RMA#
(800) 345-9401 or (714) 992-6990
COPYRIGHT 
Copyright 2007 by Anaheim Automation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, 
or translated into any language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior 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 consequential 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 Terms and Conditions, the user of Anaheim Automation products in life support applications assumes all 
risks of such use and indemnifi es 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 specifi cations. 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 fi rst. Warranty provisions may be voided if products are subjected to physical modifi cations, 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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Open Loop Torque Speed Curve