Table of Contents
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9-12
Extended Drive Functions
Real Resolution of Measuring
Encoder
Smoothing the Actual Measuring
Encoder Position Value
Velocity of the Axis or Shaft to
be Measured
Signal Monitoring for Sine
Encoders
Monitoring the Axis or Shaft
Position
Monitoring the Position Data
Reference
Note:
The value of P-0-0326 calculated according to the formulas
"drive-internal measuring encoder resolution" normally will
never be exactly 2
depending on the encoder, as little as possible greater than
15
2
, the conditions with regard to the selected number of
cycles and the possibilities of encoder evaluation are ideal!
The lower value from "drive-internal resolution of master axis position
data" and "maximum measuring encoder resolution after digitalization" is
the real resolution of the position data.
The actual position values of the measuring encoder (P-0-0052) can be
smoothed via a filter. The time constant of smoothing is entered in
parameter P-0-0329, Smoothing of actual position value 3 of
measuring encoder. Smoothing can also be deactivated (see Parameter
Description P-0-0329).
The velocity of the axis or shaft to be measured is displayed in parameter
P-0-0332, Actual velocity value of measuring encoder. The scaling of
the velocity is axis or shaft revolutions per minute.
Monitoring Functions for Measuring Encoder
For the measuring encoder there are signal monitoring functions that are
corresponding to the monitoring functions for motor encoder and optional
encoder. The drive, however, outputs warnings or error messages
specific to the measuring encoder.
See "Measuring Systems: Monitoring the Measuring Systems" in chapter
"Motor, Mechanical Axis System, Measuring Systems"
For signal monitoring of sine encoders as measuring encoders the
following diagnostic messages can be generated:
• E2076 Measuring encoder: encoder signals disturbed
• F2043 Measuring encoder: encoder signals incorrect
When the drive is switched off, the current encoder data of an absolute
measuring encoder are stored in
• P-0-0179, Absolute encoder buffer 3 (measuring encoder).
When switching on a drive with an absolute measuring encoder, a check
is run to determine in how far the current actual position value of the
measuring encoder differs from the actual position value at the time the
drive was switched off the last time. The maximum allowed difference is
determined in
• P-0-0097, Absolute encoder monitoring window for measuring
encoder.
If the difference exceeds the determined value, the following error
message is output:
• F2076 Actual pos. value 3 outside absolute encoder window
This monitoring function can be deactivated!
The position data reference of a measuring encoder that can be
evaluated in absolute form gets lost after the following measures have
been taken:
• change of parameter values of mechanical connection
• change of encoder resolution
• change of modulo range
• replacement of measuring encoder
MPH-02, MPB-02, MPD-02
15
(= 32768). With results that are,
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
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