HEIDENHAIN ND 221 B v.2 - Manual (Page 17)

17
Parameter Settings / Function
P43 REF Reference marks
One reference mark
SINGLE REF.
Distance-coded with 500 • SP
(SP: signal period)
500 SP
Distance-coded with 1000 • SP
(e.g. for HEIDENHAIN LS ...C)
1000 SP
Distance-coded with 2000 • SP 2000 SP
Distance-coded with 5000 • SP 5000 SP
P44 REF Reference mark evaluation
Evaluate the reference mark
REF. ON
Do not evaluate the reference
mark
REF. OFF
P45 ALARM Encoder monitoring
No monitoring
ALARM OFF
Monitor the frequency FREQUENCY
Monitor contamination CONTAMINAT.
Contamination + frequency FRQ. + CONT.
P50 RS232 Baud rate
110 / 150 / 300 / 600 / 1200 /
2 400 / 4 800 / 9 600 / 19 200 /
38 400 baud
Parameter Settings/ Function
P41 L.COMP. Linear error compensation
– 99 999.9 < P41 < + 99 999.9 [µm/m]
Default setting: 0
Example: Find input value for P41
Displayed measuring length ............. L
a
= 620.000 mm
Actual length (measured, e.g.
with the VM 101 comparator
system from HEIDENHAIN) .............. L
t
= 619.877 mm
Length difference ............................. ∆L = L
t
– L
a
= – 123 µm
Compensation factor k (= P41):
k =
∆L / L
a
= – 123 µm / 0.62 m ........ k = – 198.4 [µm/m]
P42 BKLASH Backlash compensation
Input range (mm):
+9.999 to -9.999
Default setting: 0.000
= no backlash compensation
During a change in direction, the mechanical play between the
encoder and table, the so-called backlash, can cause error.
Positive backlash: The rotary encoder moves before the table,
therefore display value is too high (positive value input).
Negative backlash: The rotary encoder moves after the table,
therefore the display value is too low (negative value input).
List of Operating Parameters