36 EM-ABS-01 for ACU 03/12
6.6 Commissioning of linear encoders
In addition to the settin
s described in the previous chapters, the conversion from the
rotary to the translatory system must be considered when it comes to commissionin
a linear encoder. This conversion is influenced
reatly by the diameter of the turnin
wheel.
The following applies:
Circumference = π * diameter
Note: Linear encoders are normally not suitable for speed control, as the sam-
plin
time is too lon
to enable
ood speed control. For this reason, the
following descriptions are based on the use as a position encoder in confi-
guration x40.
Note: 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 commissionin
linear encoders with ACTIVE CUBE frequency inverters.
Linear encoders typically have a fixed resolution (e.g. 1 mm). In some linear encod-
ers, the resolution can be confi
ured. 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 usin
the four parameters
its/Turn 1271, Bits Multiturn 1272, EC2 Gear Factor Numerator 513 and
C2
Gear Factor Denominator
514.
he positionin
reference system is always referred to the output side, in user units,
through parameters
Feed constant 1115, Gear Box: Driving Shaft Revolutions 1116
and
Gear Box: Motor Shaft Revolutions 1117. Thus, these parameters must also be
considered when configuring the linear encoder.
Note:
Parameters
Bits/Turn 1271 and Bits Multiturn 1272 are virtual quantities
in the case of a linear encoder and are determined by the mechanical
properties of the system. Different properties of the mechanical system
(e.
.
ear transmission or turnin
wheel diameter) will lead to differen
parameter settings.
Note:
Shifting of a bit in parameters
Bits/Turn 1271 and Bits Multiturn 1272
has the same effect as doubling or halving in parameters
C2 Gear Facto
umerato
513/ EC2 Gear Factor Denominator 514.
Reduction of
Bits/Turn 1271 or increase of Bits Multiturn 1272 by 1 Bit
--> has the same effect as doubling of 513 / 514
Increase of
Bits/Turn 1271 or reduction of Bits Multiturn 1272 by 1 Bit
--> has the same effect as halving of 513 / 514
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