Hytec Electronics Ltd
 

Data Acquisition and Control

Stepper Motor Driver 8909U
DIN Rail Module

The Hytec 8909U is a simple and compact DIN-rail mounted stepper motor driver for use with 6 or 8-lead hybrid stepper motors. The unit has the following features:-

·         Four channels of unipolar stepper motor drive at up to 1 amp per phase
·         Single external 12 or 24-volt power supply.
·         Direct connection to the Hytec 8601 Stepper Motor Controller.
·         Simple hook-up to the motor via screw terminals.
·         Limit Switch and Encoder inputs for all four channels
·         Fully opto-isolated on the VME/8601 side
·         Full over-current detection on all outputs with fault reporting to the 8601
·         Direct drive of 12 or 24-volt motors or use with external series resistors.

Each channel has three inputs coming from the 8601; these are step, direction and auxiliary. The auxiliary signal may be used to control the power to the motor if desired.

Each channel also sends back four status signals to the 8601; these are positive and negative travel limit switch signals; a home limit signal and a fault signal. The fault signal is asserted if either of the output current sense signals for the channel indicate a fault. This fault detection results in the motor power being shut off for a pre-determined time (nominally 100 milliseconds) after which power is re-applied to gauge if the fault has been removed.

In addition, the unit contains logic for accepting single-ended TTL signals from quadrature encoders giving phase A and phase B signals. 5-volt power for this type of encoder is provided at the screw terminal interface.

Hytec offers companion DC power supplies in DIN-rail mounting format and 12 or 24-volt output versions with either 5 or 10 amp outputs. The 5 amp version would be used when 0.5 amp motors are being driven, while the 10 amp version would be needed if driving at 1 amp per phase. Hytec can also offer suitable series resistor assemblies, for example, two 50-watt 22 ohm resistors mounted on an aluminium plate for each motor, suitable for 24-volt 1 amp operation.

Specification

Size:                           DIN-rail module   7.5 ins x 3.0 ins
Operating temp:            0 to 45 deg C ambient
Number of channels:      4
Step Sequence:            Half-step – 400 steps per revolution.
Fault detection:            Over-current detection at preset (user adjustable) level on all eight                                    phase output driving cells.
Power:                         +24V @ phase current x 8 plus 0.2 amps maximum

PCB Jumpers

J1               Factory set

J2               Select power enable mode: OUT = On all the time; IN = Motors powered when                   stepping.

J3               Factory set

Connections
I/O Connector - 50 way on 8909U Board

Pin

Signal

Pin

Signal

1

Ch1 Step output

26

Ch 1 Phase A

2

Ch1 Direction output

27

Ch 1 Phase B

3

Ch1 OP1 output

28

CH 1 Index

4

Ch1 OP2 output

29

Reserved I/P4

5

Ch2 Step output

30

Ch 2 Phase A

6

Ch2 Direction output

31

Ch 2 Phase B

7

Ch2 OP1 output

32

Ch 2 Index

8

Ch2 OP2 output

33

Reserved I/P8

9

Ch3 Step output

34

Ch 3 Phase A

10

Ch3 Direction output

35

Ch 3 Phase B

11

Ch3 OP1 output

36

Ch 3 Index

12

Ch3 OP2 output

37

Reserved I/P12

13

Ch4 Step output

38

Ch 4 Phase A

14

Ch4 Direction output

39

Ch 4 Phase B

15

Ch4 OP1 output

40

Ch 4 Index

16

Ch4 OP2 output

41

     Reserved I/P16

17

Ch1 +LIM I/P

42

GND

18

Ch1 HOME LIM I/P

43

Ch1 -LIM I/P

19

Ch2 +LIM I/P

44

Ch1 FAULT I/P

20

Ch1 HOME LIM I/P

45

Ch2 -LIM I/P

21

Ch3 +LIM I/P

46

Ch2 FAULT I/P

22

Ch3 HOME LIM I/P

47

Ch3 -LIM I/P

23

Ch4 +LIM I/P

48

Ch3 FAULT I/P

24

Ch4 HOME LIM I/P

49

Ch4 -LIM I/P

25

GND

50

Ch4 FAULT I/P

 

MOTOR CONNECTOR – 14-WAY SCREW TERMINALS

 

Pin          Function

1           Motor phase A

2           Phase A/B centre tap

3           Motor phase B

4           Motor phase C

5           Phase C/D centre tap

6           Motor phase D

7           Ground

8           Encoder phase A

9           Encoder phase B

10          5-volt encoder supply

11          Positive limit switch (to ground)

12          Negative limit switch (to ground)

13          Home limit switch (to ground)

14          Spare

 

POWER INPUT CONNECTOR

 

Pin           Function

1             12 or 24-volt power

2             GROUND

3             GROUND

 

Download User Manual

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HYTEC Head Office
Post : 5 Cradock Road, Reading, Berkshire, RG2 0JT, England.
Phone : +44 (0)118 9757770
Fax : +44 (0)118 9757566


Copyright © 2006 [Hytec Electronics Ltd]. All rights reserved.
Information in this document is subject to change without notice.
Other products and companies referred to herein are trademarks or registered trademarks of their respective companies or mark holders.
Our policy is one of continuous product development and the right is reserved to supply equipment which may vary slightly from that described.

Last modified: October 29, 2008