JVL MIS17 Series User Manual page 162

6.5
6.5.8 Making a Zero point offset
Common for all the zero search modes, it is possible to optionally define the zero point
as a value other than zero (position 0).
When is it useful to use the zero point offset?
- If it is required that the position interval under normal operation is always convenient
values from 0 to x instead of a mixture of negative and positive values. This can hap-
pen if the zero point sensor is placed a long distance away from the normal position-
ing interval or inside the normal positioning interval.
- If an automatic move to an initial position is desired after a power up zero search.
The offset value must be specified in the "Zero search position" field.
The complete zero search will be performed in the following order:
1. The zero search is started either automatically (power up) or initiated by a command
from the serial interface.
2. The basic Zero search is completed and the position counter is set to the value spec-
ified in the "Zero search position" field.
3. If the zero search position value is different from position, the motor will now move
to position 0.
4. The zero search is now complete and the motor will switch to normal operation, i.e.
the mode selected in the "Start up mode" field in the main window.
The illustration below shows the complete zero search cycle.
162 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS17x, 23x, 34x, 43x
Zero search modes
The motor will always go to position 0
after a complete Zero search is done - this
causes the motor to move the difference
between 0 and the value specified in the
"Zero search position" field.
Velocity
Zero search in progress
velocity etc. depends on
the actual zero search mode.
Zero search
started
TT2171-02GB
The speed and acceleration
is set to the general setting
in MacTalk under "Profile data"
After the basic zero search has
been done, the actual position counter
is set to the value specified in the
"Zero search position" register
Time
Actual position counter
is now zero (position 0).
Zero search complete.