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0$&+,1( &21752//( 5 67(33(508/7 ,3/(;&$5' 6.32 Technical Reference Manual Chapter Issue 4 May 03 S tepper Multiple xer Supplies Monitor Card The card consist s of a supplies monitor section and a mult…
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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
3
2
2
2
2
NextMove
4 Output Drives
NextMove I/O
Stepper Multiplexer
Step
Step
Dir
Dir
Dual
Stepper
Dual
Stepper
Home
N/A
Home
Home
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
TP
-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
2
1
0
000
MUX 0
MUX 1
MUX 2
MUX 3
MUX 4
Front Squeegee
Rear Squeegee
Moving Rail
Paste Carriage
Unused
0
0
1
001
100
011
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6.32 Technical Reference Manual Chapter Issue 4 May 03
Stepper Multiplexer Supplies Monitor Card
The card consists of a supplies monitor section and a multiplexer section. The
multiplexer can be subdivided into three sections the MUX monitor, the Stepper
Line Decoder and the Axis Home Encoder.
The supplies monitor section is labelled with the relevant monitor voltage and
green LEDs are used to indicate that voltages are present. Test points are also
provided so that the voltage of the supplies can be measured with respect to
zero volts.
The MUX monitor consists of 5 yellow LEDs which provide an indication of the
currently selected channel from the stepper line encoder section, this section
decodes the three input control lines to give eight sequential outputs as
described previously. The outputs from the decoder are fed to the dual stepper
driver cards, described later. In addition to this, the MUX axis step signal and
the MUX axis direction signals from the NextMove card are routed into the
stepper line encoder section to establish the step and direction commands on
each of the dual stepper drive cards.
The axis home encoder section enables the signals from the home axis
switches to be directed to the NextMove card, it can establish which axes have
found their home positions relevant to the control sequence.
Figure 6-23 Stepper MUX/Supplies Monitor
CAUTION
ANTI-STATIC HANDLING.
Standard precautions must be adhered to when
handling electronic cards and configuring and inserting into the enclo-
sures.
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Chapter Issue 4 May 03 Technical Reference Manual 6.33
DUAL STEPPER DRIVE
The dual stepper drive card can be configured to drive either a single or two
stepper motors. For single axis control, the drive cards are not populated with
two device sets.
Stepper drive signal coding is generated by two on board OTP-EPROM 8-Bit
CMOS Micro-controllers (PIC16C54). The drive to each stepper motor phase
is provided by two H-Bridge motor driver devices (LMD 18245).
Circuit Protection The circuit is connected to the + 24V SW (Switched) and the + 24V US
(UnSwitched) supplies. The unswitched supply is protected by a diode-fuse
voltage transient suppressor circuit consisting of D2 and F1(0.5AT). The diode
operates over an extremely short time period, this enables the absorption of
voltage spikes without blowing the fuse. If a sustained current is experienced
the fuse exceeds its rated value and blows. The switched supply is similarly
protected by a diode-fuse circuit consisting of D1 and F2 (3.15AT)
Regulated Supply The +5V regulated voltage (VCC) is provided by the +24V US voltage at the
output of U7. This voltage in turn provides the CH1 and CH2 reference voltages
for the LMD 18245 DAC Ref, this output is used as a comparator voltage in the
device’s internal 4-Bit digital to analog converter.
Input Signals Two inputs, Dir 1 and Dir 2 are the direction inputs and Step 1 and Step 2 are
the step signals to the stepper drive motors. These signals are opto coupled
through the input device U3 (TLP 521 - 4) then routed to the respective micro
controller devices (PIC16C54) and test points TP1-4.