HEIDENHAIN ND 282 B User Manual
User’s Manual
ND 282
Measured Value
Displays
English (en)
4/2001
B
Display of actual value and input
(8 decades with algebraic sign)
REF SET START PRINT inch
=
<>
21
MIN ACTL MAX DIFF
HEIDENHAIN
Status display with indicators
Numeric keypad
with decimal point
789
456
MOD
123
.
0
CL
2
Key Function
• Set datum
• Transfer input value
• Set display to value from P79 (P80!)
• Leave parameter list
• Select datum
• Page backwards in parameter list
MOD
• Start series of measurements
• Switch display for measurement series
• Start measured value output “PRINT”
• Select parameter after switch-on
• Page forward in parameter list
• Delete entry
• Set display to zero (P80!)
• CL plus MOD: select parameter list
• CL plus number: select parameter
• Algebraic sign
• Reduce parameter value
• Decimal point
• Increase parameter value
Indicator Meaning
REF If the decimal points are also blinking:
Display is waiting for reference mark
traversing. If decimal points are not blinking:
Reference mark has been traversed—display
stores datum points in nonvolatile memory
Blinking: display is waiting for ENT or
CL to be depressed
inch Position values in inches
1 / 2 Selected datum point
PRINT Blinking: Display is waiting for ENT to
be pressed for data output
SET Blinking: Display is waiting for input values
< / = / > Sorting and tolerance checking:
measured value smaller than lower limit /
within the limits / greater than upper limit
MIN
/
MAX / Series of measurements: Minimum /
DIFF / ACTL
START Series of measurements is running
maximum / greatest difference (MAX–MIN) /
current measured value
Blinking: Confirm selection or deselect
function
Blinking: Display is waiting for signal to
start series of measurements
3
Items supplied with ND 282 B
ND 282 B Measured value display unit,
benchtop model
Encoder input 11 µA
Power cord 3 m (9.9 ft)
User's Manual ND 282 B
Items Supplied
Adhesive plug-in feet For stacking ND 282 B units
This manual is for the ND 282 B measured value
display with the following software number or higher:
PP
354 394-01
Id. Nr. 344 998-xx
The software number is indicated on a label on the
4
rear panel.
Contents
Working with the ND Display Units
Encoders and Reference Marks 6
Switch-On, Traversing the Reference Marks 7
Datum Setting 8
Finding Minimum and Maximum Values 9
Sorting and Tolerance Checking 12
Measured Value Output 13
Error Messages 15
Installation and Specifications
Rear Panel, Accessories 16
Mounting 17
Power Connection 18
Operating Parameters 19
List of Operating Parameters 21
Linear Encoders 24
BCD Interface (X33) 27
Switching Inputs and Outputs EXT (X41) 29
Distance-to-Go Mode 34
Displaying the Software Version 35
Locking the Keypad 36
Specifications 37
Dimensions 38
Contents
5
Position Encoders and Reference Marks
The ND 282 B display unit is designed for use with photoelectrical linear encoders with 11 µA
primarily for HEIDENHAIN MT length gauges with 11 µA
The MT length gauges have one reference mark. The scales
of other photoelectric linear encoders (see “Linear Encoders”) can contain one reference mark or many
reference marks.
coded
If there is an interruption of power, the relationship between
the position of the length gauge and the displayed position
value is lost. The reference marks on the position encoders
and the REF reference mark evaluation feature enable the
display unit to quickly reestablish this relationship again
when the power is restored.
When a reference mark is crossed over, a signal is generated
which identifies that position as a reference point. At the
same time, the display unit restores the relationship be-
Position Encoders and Reference Marks
tween length gauge position and display values which you
last defined by setting the datum.
To restore the datum on scales with distance-coded refer-
ence marks, you only need to traverse a maximum of 20 mm
for linear encoders.
sinusoidal signals:
PP
distance-
PP
.
Scale in Distance-coded
linear encoder reference marks
Reference mark
Reference marks on linear encoders
6
Switch-On, Traversing the Reference Marks
REF Mode
ä
0
ENT...CL
5 , 6 9 7
For automation purposes, crossing over the reference marks
and the display ENT ... CL can be disabled with parameter P82.
Turn on the power.
1
(Switch located on rear panel.)
• ND 282 B appears for two seconds.
• ENT ... CL
• REF indicator is blinking.
• Data interface shows error 7.
Switch-on the reference mark evaluation
function.
• The position value that was last
assigned to the reference mark
position is displayed.
• REF indicator lights up.
• Decimal point is blinking.
Cross over the reference mark.
Move the plunger until the display starts
counting and the decimal point stops blink-
Û
ing. The display is now ready for operation.
1)
appears.
Crossing over the reference marks automatically switches the
display to REF mode: The last assignment of display values to
length gauge positions is stored in nonvolatile memory.
1)
Press the CL key if you choose not to traverse the reference
marks. Note that, in this case, the relationship between
length gauge position and display value will be lost if the
power is interrupted or if the unit is switched off.
Switch-On, Traversing the Reference Marks
7
Datum Setting
The datum setting procedure assigns a display value to a
known position. With the ND 200 series, you can set two
separate datum points.
There are several ways to set the datum:
• Enter a numerical value, or
• Transfer a value from an operating parameter
Datum Setting
(see P79, P80), or
• By external signal
Select datum 1 or 2.
Enter numerical value (here 5),
5
You can switch between datums 1 and 2 as desired. Datum 2
can be used, for example, for working with incremental dimensions.
When you switch back to datum 1, the display unit resumes
display of the actual position of the MT.
SET blinks.
Confirmthe entered numerical value.
Z
?
?
?
?
?
Without datum setting: unknown assignment of measured
values to positions
8
After datum setting: Assignment of measured values to
positions
Finding Minimum and Maximum Values from a
Series of Measurements
After a series of measurements has been started, the display
transfers the first measured value to the memory for minimum
and maximum values. Every 0.55 ms, the display compares the
current measured value with the memory contents: A new
value is stored if it is greater than the stored maximum value or
smaller than the stored minimum value. At the same time, the
display calculates and stores the difference DIFF between the
current MIN and MAX values.
Display Meaning
MIN Minimum value from the series of measurements
MAX Maximum value from the series of measurements
DIFF Difference MAX – MIN
ACTL Current measured value
MAX
ACTL
Series of measurements: The MIN, MAX and DIFF values of an
uneven surface
DIFF
MIN
Starting the measurement series and selecting the display
You can start the series of measurements either by pressing
MOD and selecting the desired display—as described on the
following pages—or by external signal over the switching
inputs at the D-sub connection EXT (see section on X41).
When a series of measurements is started, the internal MIN/
MAX/DIFF memory is reset.
Example: Measurement series for determining eccentricity
Finding Minimum and Maximum Values
e
9
Starting a series of measurements
Switching between MIN, MAX, DIFF and ACTL displays
Repeatedly
MOD
MAX
Repeatedly
Select the display for a series of measurements.
The selected indicator blinks (here, MAX).
Confirm selection.
... until the START indicator blinks.
MOD
START
Start the series of measurements.
Finding Minimum and Maximum Values
Indicator preselection
Press MOD to start the series of measurements and select the
display with the indicators.
Operating parameter P86 allows you to define which indicator
is displayed first when MOD is pressed.
It is not possible to switch between the displays as
described below if the switching input for external
control of the series of measurements (pin 6 on
D-sub connection EXT) is active.
As an alternative, you can select the display with operating
parameter P21 (see “Operating Parameters”).
Repeatedly
MOD
MIN
The display now shows the smallest value measured during the
current series of measurements.
Select the new display of a series of
measurements.
The selected indicator blinks (here, MIN).
Confirm the change.
10
Starting a new series of measurements
Repeatedly
MOD
START
Ending a series of measurements
Repeatedly
MOD
or
Repeatedly
MOD
START
Select the indicator START.
The indicator START blinks.
Start a new series of measurements.
Select the active indicator (MIN, ACTL,
MAX, DIFF).
The indicator that lit up last blinks.
End the series of measurements.
Select the indicator START.
The START indicator blinks.
Finding Minimum and Maximum Values
End the series of measurements.
11
Sorting and Tolerance Checking
In the sorting and tolerance checking mode, the display unit
compares the displayed value with the programmed upper
and lower sorting limits. The sorting and tolerance checking
mode is enabled and disabled with operating parameter
P17.
Entering sorting limits
Sorting limits are entered in operating parameters P18 and
P19 (see “Operating Parameters”).
Sorting signals
The indicators and switching outputs at D-sub connection
EXT (see section on X41) sort the display value into one of
three classes.
Sorting and Tolerance Checking
Display Meaning
= Measured value is within sorting limits
< Measured value is smaller than lower sorting
limit
> Measured value is greater than upper sorting
limit
Part 1
Accept
Part 2
Rework
12
Operating parameters for sorting and tolerance
checking
P17 CLASS. Sorting ON/OFF
P18 L.CLASS. Lower sorting limit
P19 U.CLASS. Upper sorting limit
Part 3
Reject
Example: Upper sorting limit = 26.02 mm
Lower sorting limit = 26.00 mm
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