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0$&+,1( &21752//( 5 67(33(508/7 ,3/(;&$5' 6.30 Technical Reference Manual Chapter Issue 4 May 03 STEPPER MUL TIPLEX CARD Mult iplex er Descriptio n The S tepper Multipl exer is used to c ontrol the st…

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Chapter Issue 4 May 03 Technical Reference Manual 6.29

Signals and Pins The following shows servo drive card edge connector pins for all cards used

on the machine:

NOTE

Axis 1 also has an input at pin 14d from the MultiMove card and an output at

pins 14b and 14z (0V) to provide the rising table brake function.

Pin Signal Description Edge Connector

2d Demand +V ±10V with respect to 4d from the NextMove Card.

Torque proportional to demand voltage (max

demand = 10V, Zero demand = 0V)

4d Demand - V Tied to GND

6d GND

2z Master Enable Input, must be grounded to enable card

12b Error Output Normally high, goes low in error condition

20 AC1 44V ac input from transformer tapping

22 AC2

24 Motor +ve Output to motor, ±62V Pulse Width Modulated

(PWM)

NOTE

The connectors for the output are plug-in types, the

wiring diagram does not show this connection

26 Motor -ve

28 GND 0V

Indicates connections used

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6.30 Technical Reference Manual Chapter Issue 4 May 03

STEPPER MULTIPLEX CARD

Multiplexer

Description

The Stepper Multiplexer is used to control the stepper motors and their sensors

which do not need to be controlled in conjunction with each other ie, not for

alignment purposes. A decoder on the multiplexer board converts the three

input control (CTRL 0-2), the drive signal (MUX Axis Step) and the axis direction

control (MUX Axis Dir) into Step and Direction outputs that are used by the Dual

Stepper Drivers. The axes controlled are; the front and rear squeegees; the

moving rail and the paste dispenser. When the axes are driven to their respec-

tive home position switches, they indicate to the multiplexer board that the axis

has reached home, a single MUX Axis Home signal is fed back to the NextMove

controller. All signals can be monitored on LEDs MUX0 to MUX4, in this way the

single home signal can be deduced for the relevant axis used.

The multiplexer can be thought of as a fully programmable switch where the

controlling inputs CTRL 0-2 determine the logical output state of eight internal

switches in the multiplexer. Only five of these switched outputs are utilized in

this application. Two signals are provided by the NextMove card - Step and

Direction (Dir). By combining (multiplexing) these signals it is possible to

sequentially switch the relevant axis (as determined in machine software) to

enable it to be driven to position. The dual stepper cards condition the signals

to achieve optimum drive results.

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Chapter Issue 4 May 03 Technical Reference Manual 6.31

Electrical Block Diagram

Figure 6-22 Stepper Multiplexer/Supplies Monitor Block Diagram

In addition to the multiplexer function this card also has a set of indicator LEDs

and test points (TP), available on the front panel for supplies voltage monitoring.

CAUTION

POTENTIAL MACHINE DAMAGE.

The links fitted to this card control the

drive sequence and step modes for each axis. If the link positions are

changed, the axis can be driven out of sequence and may cause damage

to the machine. The correct link fittings are factory set and should not be

changed.

Alignment (XF, XR, Y)[to alignment Dual Stepper Cards]

CTRL 0-2

MUX Axis Dir

MUX Axis

Home

MUX Axis

Step

NextMove

4 Output Drives

NextMove I/O

Stepper Multiplexer

Step

Dir

Dual

Stepper

Dual

Stepper

Home

N/A

Home

Paste Car Home

Rail Home

Rear Sq Home

Front Sq Home

24V USR

+ 12V USR

5V LOGIC

24V US MMX13

AC1

AC2

24V Fans

24V Stepper

24 SW MMX12

24 SW MMX11

24 US MMX13

+12 USR

-12 USR

5V LOGIC

0V US

-12V USR

0V US

Supplies Monitor

AC1

AC2

24V Fans

24V Stepper

24V SW MMX13

NOTE

MMXxx Denotes the MultiMove Axis

24VSW MMX11

Multiplexer

MUX

Monitor

0-4

Multiplexer Control MUX 0-4

Truth Table

Description O/P

CTRL

Bit

000

MUX 0

MUX 1

MUX 2

MUX 3

MUX 4

Front Squeegee

Rear Squeegee

Moving Rail

Paste Carriage

Unused

001

100

011