HEIDENHAIN ND 287 User Manual - Manual (Page 73)

ND 287
73
II – 2 Installation Set
u
p
Incremental rotary encoder
 For rotary encoders, enter the encoder's signal period per revolution
(360°) directly in the SIGNAL PERIOD field (see "Encoder
parameters" on page 98). Press the DOWN arrow key to move to the
next parameter.
 In the REFERENCE MARK field, use the numeric keys to enter the
number of reference marks (0 for NONE, 1 for SINGLE, ...) per
revolution (360°).
 In the EXTERNAL REF field, press the ON/OFF soft key to select
whether pin 25 at connection X41 is active or inactive. This pin can
be used to activate or deactivate the reference mode. The
respective current status is changed.
 In the COUNT DIRECTION field, select the count direction by
pressing the POSITIVE/ NEGATIVE soft key. If the encoder's count
direction matches the user's traverse direction, select POSITIVE. If
the directions do not match, select NEGATIVE.

In the ERROR MONITOR field, select whether the ND will monitor
and display encoder counting and signal errors by pressing the
ERROR soft key. In the ERROR MONITOR field, you can select OFF,
FREQUENCY, CONTAMINATION or FRQ.+CONTAMINATION.
When an error message occurs, press the C key to acknowledge it.
Counting errors
are caused by contamination or excessive
frequency:
 Contamination : The signal to the encoder falls below a set limit.
 Frequency errors : The signal frequency exceeds the set limit.
Fig. II.13 Incremental rotary encoder form
Fig. II.14 Incremental rotary encoder form
Fig. II.15 Incremental rotary encoder form
If you set the ERROR MONITOR field to OFF, the ND 287
will ignore encoder errors.