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MPH-02, MPB-02, MPD-02
Reference Position
Operating Principle
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Note:
In the case of rotary encoders, reference mark signals usually
occur once per encoder revolution!
When the reference mark signal is read the next time, the previous,
encoder-related actual position value at a reference position of the axis or
shaft is set to a defined value. The reference position corresponds to the
current axis position at the occurrence of the reference mark signal.
Note:
When reference mark evaluation has been activated, only the
reference mark that was read first is evaluated, other
reference marks are ignored!
The new actual position value at the reference position after the homing
procedure is the value of parameter
• P-0-0087, Actual position value offset of measuring encoder.
P-0-0052
P-0-0052:
actual position value of measuring encoder
P-0-0087:
actual position value offset of measuring encoder
Fig. 9-10:
Actual position value of the measuring encoder after homing
procedure
When the position reference of the measuring encoder was established,
this is displayed in parameter P-0-0331, Status of measuring encoder.
The reference mark evaluation for the measuring encoder should then be
deactivated in the respective bit of parameter P-0-0330, Control word of
measuring encoder!
Note:
When a measuring encoder gear is used, the occurrence of
the reference mark of the encoder with reference to the actual
position value of the axis or shaft to be measured mostly isn't
unequivocal! On the control side it is necessary to make sure
that the reference mark evaluation is activated at the
appropriate axis or shaft position (identification via initiator or
the like)!
Shifting the Position Data Reference
Shifting the position data reference affects the current actual position
value of the measuring encoder connected to the drive. Whether the
current actual position value has position data reference to the axis or not
is irrelevant for the shifting of the position data reference! The shifting is
triggered on the master side by writing P-0-0087, Actual position value
offset of measuring encoder and is immediately carried out on the drive
side.
Note:
The reference status of the actual position values is not
affected by the shifting of the position data reference.
When the drive is switched on the first time, the offset, set by the current
value of P-0-0087, with regard to the original actual position value of the
measuring encoder takes immediate effect.
If the position data reference is shifted several times in succession, each
new value in P-0-0087 refers to the original actual position value of the
measuring encoder, i.e. the shifted values do not act in an additive way!
Extended Drive Functions
= P-0-0087
new
9-15
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