6encoder evaluation – Lenze 9400 User Manual
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Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
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6
Encoder evaluation
6.3
Parameter setting
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6.3.8.3
Linear distance measuring devices with SSI protocol
Linear distance measuring devices provide the position directly in a physical unit of length (e.g.
[mm]). An incremental position must be sent to the position controller via the system block
LS_Feedback. The reference of this incremental position corresponds to a value of 65536 (Lenze
setting:
= 16) in the case of a revolution at the output end.
The necessary conversion of the position value can be carried out by means of the block
L_EsEncoderConv. The block L_EsEncoderConv is designed for rotary encoders. Conversion to
(notional) rotative values is therefore necessary for the adaptation of linear distance measuring
devices. The results of the conversion must be entered in the code.
Conversion for the number of encoder increments in C05273:
In the case of linear distance measurement devices, the encoder resolution is usually indicated in
the form of graduations in [μm] or as a number of increments per millimetre [inc/mm].
The following rule of thumb can be used to determined the number of encoder increments C05273:
[6-9]
Determinatino of the number or encoder increments of linear distance measuring devices with SSI protocol
The integer (INT = integer part of the calculation) must be entered in C05273. The resulting
rounding-off error is corrected by means of the position encoder gearbox factor (
in the machine parameters.
Determination of the position encoder gearbox factor of linear distance measuring devices with
The resulting maximum position which can be shown can be checked in
.
The maximum speed that can be shown is indicated in
If the necessary speeds and positions for the application can no longer be shown, C05273 can be
enlarged. The internal resolution is thus decreased.
Calculation of the position encoder gearbox factor
Please note that, when the number of encoder increments in the numerator of the following
formula is indicated, the value with decimal places must be given whereas, in the numerator, the
integer (INT = integer) is used for purposes of calculation:
[6-10] Determination of the position encoder gearbox factor of linear distance measuring devices with SSI protocol
Number of encoder increments
Feed constant [units/rev]
Encoder graduation [units]
---------------------------------------------------------------------
=
C05273 = INT number of encoder increments
C02524
Encoder graduation
---------------------------------------------------
=
Position encoder - gearbox factor
Encoder Strichzahl (incl. decimal places)
–
Number of encoder increments (integer)
-----------------------------------------------------------------------------------------------------------------
=
C02522
C02523
--------------------
Number of encoder increments (incl. decimal places)
C05273
----------------------------------------------------------------------------------------------------------------------------------------
=