JVL MAC050 User Manual page 38

2.6
2.6.8 Making a Zero point offset
Common for all the Homing modes, it can optionally be chosen to 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 desired that the position interval under normal operation is always convenient
positive values from 0 to +n, instead of a mixture of negative and positive values. This
can occur if the zero point sensor is placed a long distance away from the normal posi-
tioning interval or inside the normal positioning interval.
- If an automatic move to an initial position is desired after a power-up Homing.
The offset value must be specified in the "Homing position" field.
The total Homing will be performed in following order.
1. The Homing is started either automatically (power up) or initiated by command from
the interface or via an expansion module.
2. The basic Homing is completed and the position counter is set to the value specified
in the Homing position field.
3. If the Homing position value is different from position, the motor will now move to
position 0.
4. The Homing is now completed and the motor will switch to normal operation which
means the mode selected in the "Startup mode" field in the main window.
The illustration below shows the complete cycle.
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Mechanical Homing
The motor will always go to position 0 after a
complete Homing is done. This causes the motor to
move the difference between 0 and the value
specified in the Homing position
Homing in progress
velocity ect. depends on
the actual homing mode
Homing started
After the basic homing has
been done, the actual
position counter is set to the
specified value in Homing
position.
JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500
setup.
The speed and acceleration is
set to the general setting in
MacTalk under Profile data.
Actual position counter
is now zero (position 0)
Homing complete.
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