Commissioning Of Linear Encoders - BONFIGLIOLI Active Cube User Manual

6.6

Commissioning of linear encoders

In addition to the settings described in the previous chapters, the conversion from the
rotary to the translatory system must be considered when it comes to commissioning
a linear encoder. This conversion is influenced greatly by the diameter of the turning
wheel.
The following applies:
Circumference = π * diameter
Note:
Note:
Linear encoders typically have a fixed resolution (e.g. 1 mm). In some linear encod-
ers, the resolution can be configured. First check the resolution of the linear encoder
using the data sheet or the parameter configuration.
The resolution of the linear encoder must be assigned in the frequency at the resolu-
tion of the selected user units. This is done using the four parameters
Bits/Turn
Gear Factor Denominator
The positioning reference system is always referred to the output side, in user units,
through parameters
and
Gear Box: Motor Shaft Revolutions
considered when configuring the linear encoder.
Note:
Note:
36
Linear encoders are normally not suitable for speed control, as the sam-
pling time is too long to enable good speed control. For this reason, the
following descriptions are based on the use as a position encoder in confi-
guration x40.
For the calculations described in this chapter, an Excel worksheet was pre-
pared by Bonfiglioli. Please contact your local sales agent. This Excel work-
sheet will help you to carry out the calculations required for commissioning
linear encoders with ACTIVE CUBE frequency inverters.
1271, 1272,
Bits Multiturn
514.
Feed constant
Parameters
Bits/Turn
in the case of a linear encoder and are determined by the mechanical
properties of the system. Different properties of the mechanical system
(e.g. gear transmission or turning wheel diameter) will lead to different
parameter settings.
Shifting of a bit in parameters
has the same effect as doubling or halving in parameters
513/
Numerator EC2 Gear Factor Denominator
Reduction of
Bits/Turn
--> has the same effect as doubling of 513 / 514
Increase of 1271 or reduction of
Bits/Turn
--> has the same effect as halving of 513 / 514
EM-ABS-01 for ACU
EC2 Gear Factor Numerator
1115,
Gear Box: Driving Shaft Revolutions
1117. Thus, these parameters must also be
1271 and
Bits Multiturn
1271 and
Bits/Turn
1271 or increase of
Bits Multiturn
Bits Multiturn
513 and
EC2
1116
1272 are virtual quantities
1272
Bits Multiturn
EC2 Gear Factor
514.
1272 by 1 Bit
1272 by 1 Bit
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