Lenze I95AE240F User Manual

12.1.3.4 Evaluaon of the signal quality
Signal quality
The signal quality is evaluated by the 0x2C42:004 par
ameter, which is used to monitor the
inial read-out and seng of the posion.
If a transmission error should occur:
•
The curr
ent angular
dri is marked as invalid in parameter , bit 7
•
The inverter maintains its operang status
Angular dri
Communicaon with the encoder is no longer monitored during angular dri
determinaon.
The value displayed in 0x2C42:003 is de
termined in dierent ways depending on the type of
encoder:
•
Determinaon of the current angular dri for the SinCos encoder
In the case of an incremental SinCos encoder, the pulses between two zero pulse events of
the Z-track are counted. Assuming that there are no faults, this value corresponds to the
set number of increments. The accuracy of this process corresponds to ± 1 increment grad-
uaon of the encoder, with the dierence between the set number of increments and the
counted pulses being converted to an angle with an accuracy of ±0.1°. The disadvantage is
that an updated angular dri value only become available at the end of a complete
encoder revoluon. In turn, this means that the update rate depends on the speed.
•
Determinaon of the current angular dri for the SinCos Hiperface® absolute value
encoder
In the case of a SinCos absolute value encoder with HIPERFACE® protocol, no Z-track is
available; instead, the posion is regularly read out of the encoder. When the rst encoder
read-out operaon is performed (aer power-up or eliminaon of wire breakage), the
encoder posion is used to inialise the internal device counter unit and to set an internal
device posion. All other read-out processes from the encoder are used to generate a dif-
ference between the internal device posion and the encoder posion. Assuming that
there are no faults, the dierence is zero. However, the dead me of the communicaon
with the encoder means that the accuracy of the process is dependent on the speed and
therefore restricted compared to the zero pulse process. However, the advantage is that
the update rate does not depend on the speed, but is instead only determined by the com-
municaon rate. The update rate is encoder-specic and is generally in the range between
30 ... 50 ms.
Parameter
Address Name / seng range / [default seng] Info
0x2C42:003 Encoder sengs: Angle
dri
•
R
ead only: x.x °
Display of the angular dri of the current angle error.
This indic
ates whether too many or two few pulses have been detected
by the internal device counter unit for EMC-related reasons.
0x2C42:004 Encoder sengs: Actual amplitude signal quality
•
Read only: x %
The signal quality indicates the actual amplitude of the SinCos analog
signals with regard to 1 Vss = 100 %.
•
The signal quality should be between 95 ... 105 %.
•
There is no need for opmisaon if the signal quality is within the tol-
erance zone for the analog encoder signals given in the data sheet of
the encoder manufacturer.
Conguring the feedback system
Congure feedback system for motor control
Enc
oder sengs
187

Lenze I95AE240F Specifications

General

Brand	Lenze
Model	I95AE240F
Category	Inverter
Language	English