JVL MAC050, User Manual

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30 JVL Industri Elektronik A/S - User Manual - Integrated Servo Motors MAC050 - 800
2.5 Mechanical zero search
2.5.7 Find index position after zero search
The motor offers 2 unique points per revolution called the index points. These points are
found by the internal hall sensors and are always the same.
By enabling the ’Find index after zero search’ feature, an extra precise zero point can be
defined.
This feature is intended to be used if the external sensor does not offer the desired pre-
cision. The feature can be used after each of the basic zero search modes including the
torque zero search mode.
Enable the index search feature in the Main window.
When the feature is selected, it is very important that the external zero search sensor is
adjusted to the correct position range with a certain margin to the index points to ensure
that the same index is always found during every zero search. If the external sensor is
activated too close to the index points, it can cause the motor to finalize the zero search
with reference to the wrong index point, which in practice will constitute an error of 0.5
motor revolution. Adjustment of the zero search point must be done regardless of which
of the 6 (3) zero search formats is selected.
The illustration below shows the MacTalk Tests tab which must be used for adjusting the
zero search point.
Ensure that the zero point test is made several times to ensure that the white dot is lo-
cated in the acceptable interval each time.
TT0974GB
Select “Find index after homing”
using this field.
TT0975GB
Press this botton to see
where the zero search
sensor (sensor search mode) or
mechanical stop (torque search
mode) is located.
The actual position will be
displayed by the little white dot
in the left side of the window.