MPH-02, MPB-02, MPD-02
Extended Drive Functions
9-13
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
During the transition from communication phase "P2" to "P4" (bb), the
drive recognizes that the former position data reference of the encoder
does no longer exist. It sets P-0-0331, Status of measuring encoder to
"not homed" and signals the loss of position data reference by the error
message
•
F2176 Loss of measuring encoder reference
.
Establishing the Position Data Reference to the Axis or
Shaft
Whether absolute evaluation is possible or not depends on the encoder
type (P-0-0076, P-0-0327), the resolution of the measuring encoder and
on the modulo range that was set (P-0-0765). This is displayed by a bit in
parameter
P-0-0328, Type of position encoder for measuring
encoder
.
Note:
The value range of position data, that can be displayed in
absolute form, of the encoder used is displayed in parameter
P-0-0334, Absolute encoder range of measuring encoder
.
If the value range of the measuring encoder determined by the
modulo factor is smaller, absolute evaluation is possible!
Depending on relative or absolute evaluation of the measuring encoder,
the controller makes available different procedures for establishing the
position data reference. Depending on the kind of evaluation there are the
following possibilities:
•
"set absolute measuring" for measuring encoders to be evaluated in
absolute form
•
"homing" for measuring encoders to be evaluated in relative form
Note:
After having successfully established the position data
reference, the actual position value refers to the axis or shaft.
The measuring encoder then is "in reference" or has been
"homed".
CAUTION
When the position data reference is established,
the actual position value of the measuring
encoder can change abruptly!
⇒
If the actual position value is used as the command
variable of the drive, the control master has to take
this into account when establishing the position data
reference!
Establishing Position Data Reference for Measuring Encoder
to be Evaluated in Absolute Form
The position data reference of a measuring encoder to be evaluated in
absolute form (see respective bits of P-0-0328) to an axis or shaft is
established by
P-0-0012, C0300 Command Set absolute measuring
.
As it is possible to connect several encoders to be evaluated in absolute
form to the controller, the absolute encoder to be homed is selected by a
bit in
P-0-0612, Control word for setting absolute measuring
. The
command "set absolute measuring" only takes effect for the selected
encoder.
Procedures for Establishing the
Position Data Reference
Activating "Set Absolute
Measuring"
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
