Anaheim Stepper DPD72351 Users Guide

							3738If a Fault occurs, reset the Fault by applying a logic “0 to the Reset Fault InputSTANDARD MOTOR TORQUE/SPEED CURVES
(terminal 4) for at least 100ms (or by cycling power OFF for at least 15
seconds).  After resetting, try to run the motor again.  If the driver faults again
then check the conditions listed below.
Is the LED blinking Slowly?
This indicates that the motor has a phase shorted or there is a short in the motor
cable or wiring.  Check the motor and the wiring for shorts. If the driver continues
to sense “shorts” after the motor and wiring are determined to be good, then the
output transistors should be checked (see below).
Is the LED blinking Quickly? 
This indicates that there is an open connection in one of the motor wires.  Check
the 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 so that it loses it’s
positioning.
Is the LED on Steadily?
This indicates that there is a ground fault - a voltage shorted to 0V.  This
detection is useful in detecting a short-to-case in a motor when the motor’s case
AND the driver’s 0V are both connected to earth ground.  Excessive noise on the
0V line may also cause the driver to sense this type of fault.  This type of fault
sensing may be disabled by placing jumper JP3 in position “1-2.  NOTE: IF THE
GROUND FAULT DETECTION IS DISABLED, DO NOT CONNECT THE
DRIVER’S 0V TO EARTH GROUND!
Checking Output Transistors1.Remove the side plate.
2.Set the multimeter to Diode Test.
3.Place the RED meter lead on (between) the Sense Resistors (labeled Rs in
Figure 5).
4.Touch the BLACK meter lead to each phase (terminals 1, 2, 12, and 13).
5.This should give readings between 0.450V and 0.550V.
6.If any  readings are significantly less than 0.450V, then the unit has been
damaged.  To send the unit in for repair, contact the factory for an RMA#. 
						

							3940TROUBLESHOOTING
My computer wont talk to the DPD72351.
To use a computer to communicate to the DPD72351, you must use a
communications program such as Crosstalk, or a programming language such as
BASIC, or C language.  The communication parameters must be set up correctlyfor 8 Data Bits, No Parity Bits, and 1 Stop Bit.  The Baud Rate can be set up for
rates between 75 Hz to 9600 (75, 150, 300, 600, 1200, 2400, 4800, 9600). Check
the Baud Rate setting on the yellow and black rotary switch on the side of the unit.
This setting must match to the baud rate you specified (see Table 12).  The
Request To Send (RTS) signal is supported by some software and not others.
Refer to the software manual to see what you need, or just use trial and error - it will
not damage anything.  Generally use RTS on, or the first 8 positions of the dip
switch. Once the communications are set up you finally need to talk to the
DPD72351.  This is done by selecting the axis you want to talk to.  Position the
Axis Select for the desired axis number for your unit.  If you chose axis 0 for
example, the rotary dip switch would be pointing to 0. To communicate to this axis,
type a period, the @ sign, the axis number, a comma, and a question mark.
(.@0,?)  The DPD72351 should then return two numbers to your screen - first the
number 35, and then the revision number of the chip.  Now you are communicating.
The unit will not Autostart.
Be sure the that the communication switch is set to RS422.
NOTE: Axis F will not autostart. 
						

							4142GLOSSARY
Absolute Mode  A positioning coordinate reference wherein all positions are specified relative to
some reference, or home position. This is different from  relative, or incremental programming,
where distances are specified relative to the current position.
Baud Rate  A term used frequently in serial data communications but often is misunderstood. A
baud is defined as the reciprocal of the shortest pulse duration in a data word (signal), including
start, stop, and parity bits. This  is often taken to mean the same as bits per second, a term that
expresses only  the number of data bits per second. Very often, the parity bit is included as  an
information or data bit.
Break Signal  A break is often used to signal a remote computer to stop trans-  mission. Typically
a Break Signal is produced by holding the data terminal  equipment (DTE) transmit data (TXD) low
for some time significantly longer than  the time it takes to send a word.
Daisychain  A term used to describe the linking of several RS422/RS232C devices in a sequence
such that a single data stream flows through one device and on to the next. Daisy-chained devices
usually are distinguished by device addresses, which serve to indicate the desired destination for
data in the stream.
Debug  A term used to define refinements to a system or program that remove undesirable effects.
EEPROM  Electrically Erasable Programmable Read-Only Memory. A memory device frequently used
with microprocessors, that can be erased and reprogrammed with-  out removing it from the circuit.
This creates non-volatile memory; i.e. memory  that wont be lost if the power is turned off.
Hard Limit Switch  A switch (i.e. photo, Hall-effect or mechanical) that defines the absolute limit
of motion in a particular direction. It may be used to prevent collisions  or out-of-bounds conditions.
    
Home  A reference position in a motion control system, usually derived from a mechanical datum.
Often designated as the zero position.
Home Limit Switch The switch used to establish the reference position designated  home.    
                                                                     
Program Counter  The Program Counter is used by the processor to point to the address of the
next instruction to be executed by the processor in the stored program mode.
Mask  A binary-weighted number that conceals some or all of the bits in an associated memory
address  or register.
Relative Mode  A coordinate system where positions or distances are specified relative to the
current position.
Stack  A register or buffer in memory that uses Last-In-First-Out (LIFO) entry and retrieval of data.
Soft Limit Switch  This switch is used exclusively in Homing Mode 0 (zero). If positioned properly
for the appropriate parameters, it causes the motor to ramp down to the Base Speed before
encountering the Home Limit Switch. This ensures that the motor speed is within the start-stop
region.
                          
Start-Stop Region  That range of speeds in which a step motor can start, stop, or reverse
direction in synchronism with the external pulse signal.
910 E. Orangefair Lane, Anaheim CA 92801
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