Newall A50 User manual

A50 Single Axis Digital Readout System
NEWALL MEASUREMENT SYSTEMS LTD
CONTENTS
2 SPECIFICATIONS
3 CONNECTIONS
4 INSTALLATION
4 Panel Mounting
4 Desktop Mounting
5 OPERATION
5 Setting the display
6 Using Digifind
6 Using Centerfind
7 SETUP
7 Using setup mode
8 Encoder type
8 Resolution
9 Direction
9 Radius / Diameter
10 Error compensation
11 Linear error compensation
12 Segmented error compensation
14 TROUBLESHOOTING
15 CLEANING
N

CONNECTIONS
A50 Digital Readout SystemCONNECTIONS
Newall Measurement Systems Ltd 3
NOTES
DO NOT CONNECT
THIS UNIT DIRECTLY
TO THE MAINS
SUPPLY.
If you have a Newall
encoder which is not fitted
with D-type connector, an
adaptor cable is available.
Part No: 307-60940
Contact your supplier for
details.
2.5mm Power Inlet
15 - 24Vdc ±10% @0.25A
Encoder Input
9-way ‘D’
Earth Ground Terminal
(Should be grounded to machine) Cable Tie Anchor
(All cables should be secured)
·The A50 is suitable for use only with Newall Spherosyn and Microsyn analogue encoders.
·Ensure that all cables are secured to prevent their connectors from dropping into hazardous positions
when unplugged, for example the floor or coolant tray.
·Ensure that all cables are routed to prevent them from being caught on moving parts.
·Turn off the power supply before connecting the encoder, by disconnecting power supply connector
·Ensure that the A50 is grounded to the machine before turning on the machine supply.
Blanking Plug

Setting The Display
OPERATION
A50 Digital Readout SystemOPERATION, Setting the display
NOTES
Toggling the display off
doesn’t turn the power off
- as long as the power
supply is plugged in, all
settings are preserved,
and the position is
updated.
At the beginning of each
working session, set the
datum in Absolute mode,
then switch the A50 to
Incremental mode.
By using the A50 in this
way, you will be able to
return the machine to its
absolute datum at any
time, by simply switching
back to Absolute mode.
If you are using
Segmented Error
Compensation, see
page 10 for details of the
datum setting procedure.
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In normal operation, the keys are used as follows:
·Press to toggle the display and keypad on and off.
·Press to toggle the display between inches
and millimetres.
·Press to toggle the A50 between absolute
and incremental mode.
Absolute mode
In this mode, the A50 will display the position
relative to an fixed datum.
Incremental mode
In this mode, theA50 can be used to display each
position relative to the last position. This is also
known as point-to-point use.
Setting the datum
·To zero the display at the current position:
press . All readings will now be relative to this zero point.
·To set the display to a known fixed point:
Example: to enter the value . All readings
will now be relative to this fixed point.
·If you make a mistake while entering a number, pressing will clear the entry one
character at a time.
·It is advisable to mark the Absolute Datum point physically on the machine , so as to be able to re-establish this
datum after power loss. See Digifind Page 6

NOTES
Digifind works only in
absolute mode.
Pressing in absolute
mode redefines the
datum.
Do not move the machine
when the A50’s power is
off.
When the power is
switched back on again,
the A50 uses Digifind to
automatically re-establish
the datum.
Entering a fixed point, or
using Centrefind, will
change the datum in
absolute mode - but
can still be used to return
to the old datum.

Using Setup Mode
SETUP
A50 Digital Readout SystemSETUP, Using setup mode
NOTES
Normally, Setup needs to
be done only once, and it
is possible that the factory
default settings are
suitable for your needs
without change.
If the power is already
switched on, pressing
will enter
setup mode.
If you have entered setup
mode in this way, you will
need to press twice
to return to normal
operating mode.
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Setup mode is accessible immediately after the power has been switched on, as follows:
When power is applied, the A50 will go through a brief self-test routine. The display shows the model
number, then the software version number, all segments and indicators light momentarily, after which the
A50 is ready for use.
·To enter Setup mode, press anytime before the self-test finishes.
·At the end of the test, the display will read . Press any key to continue.
There are five options that can be configured:
Option Default Display
Encoder type Spherosyn
Resolution 0.005mm
Direction 1
Radius / Diameter Radius
Error compensation Off
To cycle through the options, press . Each option is described in detail on the following pages.
When you have finished setting all the options, press to return the A50 to normal operating mode.

Resolution
Encoder Type
NOTES
The Encoder setting
must match the actual
encoder in use, or the
A50 will not display the
measurement correctly.
There are three possible settings:
Spherosyn Microsyn 10
Microsyn 5
·Press to cycle between the four settings.
·Press to accept the setting and move on to the next option - Resolution.
The Resolution settings available will depend on the encoder, and also on the setting.
Display Spherosyn or Microsyn 5
Microsyn 10
1µm (0.001) (0.00005) . . . . . . . . . . . . . . . . . . . . . . . . . . .
2µm (0.002) (0.0001) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5µm (0.005) (0.0002) . . . . . . . . . . . . . . . . . . . . . . . . .
10µm (0.01) (0.0005) . . . . . . . . . . . . . . . . . . . . . . . . .
20µm (0.02) (0.001) . . . . . . . . . . . . . . . . . . . . . . . . . .
50µm (0.05) (0.002) . . . . . . . . . . . .
·Press to cycle between the four available settings.
·Press to accept the setting and move on to the next option - Direction.

Radius / Diameter
Direction
A50 Digital Readout SystemSETUP, Direction, Circle measurement
Newall Measurement Systems Ltd 9
The Direction setting allows you to match the A50 to the actual direction of travel of the machine.
alternative settings
·Press to cycle between the two settings.
·Press to accept the setting and move on to the next option - Radius / Diameter
Selecting the Diameter setting causes the A50 to display double the actual scale / machine movement
radius
diameter
·Press to cycle between the two settings.
·Press to accept the setting and move on to the next option - Error Compensation.
SETUP NOTES
The Direction setting is
quite arbitrary. Set it to
whichever makes most
sense to the job.
The Diameter setting is
useful for lathes, and
other turning applications,
to display diameter, rather
than radius.

Error Compensation
NOTES
If error compensation is
applied, it is important
that it is absolutely
correct, If is not correct,
errors could be increased
rather than reduced.
After setting up the error
compensation, it is
advisable to check its
effect in normal operation.
Segmented
compensation need not
be over the entire scale
length.
It can be applied to a
length of high importance.
It can be as small as one
segment.
There are three possible settings:
off
linear error compensation
segmented error compensation
·Press to cycle between the three settings
·If you select linear compensation or segmented compensation, pressing will take you to the
individual settings for the compensation method chosen, described below.
Linear compensation
In this mode, a single constant
correction factor for the scale can
be applied
t

Linear Error Compensation
A50 Digital Readout SystemSETUP, Linear error compensation
NOTES
The correction factor
cannot be established
while in Setup mode.
Carry out the
measurements in normal
operating mode, then
turn the power off and re-
enter Setup mode as
described on page 7.
Where the measurement
of the standard included
the tool / probe diameter
this should be subtracted
from the displayed
measurement.
Only values between
-9999 and +9999 are
allowed.
If you make a mistake
while entering a number,
pressing will clear
the entry one character at
a time.
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Calculating the correction factor
Example - to check the scale against a standard which is exactly 500mm wide:
·Set the tool or probe to one edge of the standard, and press . The display will read
.
·Set the tool or probe to the other edge of the standard. Assume the A50 displays .
·Calculate the correction factor:
error = (500.000 - 499.800) = 0.2mm
correction error factor = x 1,000,000 = +400 ppm
This measured value needs to be increased to match the standard, so this is a positive correction
factor.
If the display had read 500.2 for the same standard, the correction factor would be -400 ppm.
Setting the correction factor
·Enter Setup mode, by pressing , and select Error Compensation.
·Select Linear Compensation, as described on page 10.
The display will read , or a previously entered value.
·Press, to enter a correction factor of 400 ppm (as above)
·To enter a different correction factor, press and start again.
·Press to accept the setting and move back to the first option - Encoder.
0.2
500
Standard
Tool Diameter

Segmented Error Compensation
NOTES
Up to 99 segments can
be defined.
To take advantage of
Segmented Error
Compensation, you will
need access to a high
accuracy standard, such
as a laser measuring
system.
Error Compensation
initially defaults to off,
with no points set.
If Error Compensation is
set to OFF after
correction points have
been set, the data is
retained, but not applied.
When Segmented Error
Compensation is set to
ON again, the data is
applied
Newall Measurement Systems Ltd12
Identification of correction parameters
The scale travel is broken down into a number of user-defined segments, each with its own correction
factor, measured against an high-accuracy standard. The following parameters need to be identified:
Each correction point is measured with respect to the starting point - zero - which is usually set close to
one end of the scale. The reference point can be set anywhere along the scale, and does not need to
coincide with either the absolute datum or any of the correction points. However, it may be convenient to
make the absolute datum and the reference point the same.
Setting the correction points
·Enter setup mode, by pressing and select error compensation.
·Select segmented compensation, as described on page 10.
The display will read .
Press to continue, or press to accept any previous settings and move back to the first option
- Encoder Type
error
travel
starting point - zero
correction points
reference point
0
12
3
4
5
6

Setting the correction points continued
The display will change to .
1Set the machine to the point you have chosen to be the starting point, and zero the high-accuracy
standard at this point. Press .
2The display will change to .
Set the machine to the point you have chosen to be correction point 1. Press .
3The display will change to .
Enter the distance from the starting point, measured by the standard.
Example, Assume the laser measuring system displays 678.9 . Then press
to enter a correction point position of 678.9. The A50 will calculate the correction factor, and record
this against its own position measurement.
·Repeat steps 2and 3for each correction point.
When all correction points have been entered, Press .
4The display will change to .
Set the machine to the point you have chosen as the reference point. Press .
5The display will return to .
Press to accept the settings and move back to the first option - Encoder Type
Exit SetUp and begin normal operation
A50 Digital Readout SystemSETUP, Segmented error compensation
NOTES
This procedure must be
carried out in strict
sequence, and in full, to
be valid. There must be
no reversals in direction.
Pressing at steps 2
or 3, will display the
current position relative to
the starting point.
Do not worry about the
direction of the standard
measurement. eg. 678.9
and -678.9 are treated
the same.
Pressing will clear
the entry one character at
a time.
When all characters are
deleted, pressing will
take you back one step at
a time.
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TROUBLESHOOTING
TROUBLESHOOTING A50 Digital Readout System
NOTES
Newall Measurement Systems Ltd14
The display is blank.
The display works, but resets
from time to time without any
keys being pressed.
The display works, but gives
erratic readings, the last digit
jitters or the measurements jump
to new figures unexpectedly.
or
appears in the display.
continued
·Press . The display may have been switched off.
·Check that the power supply is correctly connected to a
working mains outlet.
·Check that the power supply cables are not damaged.
·Check that the power supply voltage is at least 13.5Vdc
(minimum operating limit)
·This suggests either that the supply voltage is too low, or that
the power supply or mains supply has an intermittent fault.
·Check that the power supply voltage is 15-24Vdc ±10%.
·Check that all connections are sound.
·This suggests that there may be a poor earth (ground)
connection.
·Both the A50, and the machine on which it is installed, must
have proper earth (ground) connections. (see page 3)
·There may be a problem with the encoder (see below).
·This indicates that the unit is not receiving a proper signal
from the encoder.
·Check that the encoder connections are sound.
continued
SolutionsSymptom

CLEANING
CLEANING
Newall Measurement Systems Ltd 15
A50 Digital Readout System
·Disconnect the power supply from the A50 before cleaning.
·Do not use corrosive or abrasive cleaning materials.
·Do not use compressed air.
·Apply a small amount of cleaning fluid to a lint-free cloth. Use this to wipe over the case and keypad,
taking care not to allow fluid into the connectors.
The unit will not respond to any
key presses.
Readings are incorrect
·Check that there is no damage to the connectors or to the
encoder.
·Substitute a known working encoder, if one is available.
·Switch the A50 off, then back on again.
·Switch the A50 off and back on again.
·Check encoder type to ensure correct selection
·Check error compensation factors
·If using segmented error, verify datum position
Symptom continued Solutions continued
TROUBLESHOOTING NOTES
Providing the machine
has not been moved
more than:
6.3mm (0.25”) for a
Spherosyn encoder or
2.5mm (0.1”) for a
Microsyn encoder
you will not lose the
datum position by
switching the power off
and back on again.
FOLLOW THESE
INSTRUCTIONS
CAREFULLY TO
AVOID DAMAGE TO
THE A50.
If the solutions suggested above do not solve your problem, contact Newall for further instruction

WORLD HEADQUARTERS
Newall Measurement Systems Ltd.
Technology Gateway, Cornwall Road
South Wigston
Leicester LE18 4XH
ENGLAND
Telephone: [phone]
Facsimile: [phone]
Email: [email protected]
Web: www.newall.co.uk
Newall Electronics, Inc.
1778 Dividend Drive
Columbus, Ohio 43228, USA
Telephone: [phone]
Toll Free: 800.229.4376
Facsimile: +1 614.771.0219
Email: [email protected]
Web: www.newall.com
NEWALL MEASUREMENT SYSTEMS LTD
023-80320-UK .June 2005