Lenze 8400 - Manual (Page 1305)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
1305
18 Function library
18.1 Function blocks | L_Interpolator_1
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18.1.95.3 Angle correction in case of transmission errors
If an angular offset between master and slave is caused due to transmission errors (missing data
telegrams), it will be corrected by a catch-up function in the FB. For this purpose, the following
connections and parameter settings are required for the slave at the FB L_Interpolator_1:
1. The master angle of the master is connected to the dnPhiIn_p input.
2. The speed signal of the master is connected to the nNIn_a input.
3. The nNOut_a output is connected to the nSet_v input of the FB
L_DFSET_1 .
The following illustration shows the principle of the catch-up function in the FB L_Interpolator_1:
[18-42] Principle of the catch-up function
The speed signal at nNIn_a is provided almost 1:1 at the nNOut_a output. In case of a telegram
error, a correction value can be added to the signal. This correction value results from the
subtraction of the integrated speed signal from the position value applied at dnPhiIn_p.
If for instance a data telegram fails, the input values for a program cycle remain constant. In the
following cycle, the correct position and speed are pending again.
"Holding" the position at dnPhiIn_p results in a difference between the position values at dnPhiIn_p
and at the output of the integrator. This difference is added to the nNOut_a output signal.
In order that this angle correction does not lead to a strong jerk in the master value, the amount of
correction increments is limited per cycle (catch-up cycle) using C00953 . A typical correction value
is for instance 10 increments/ms.
When the controller is inhibited, the integrator is to be loaded with the position value pending at
dnPhiIn_p by setting the bSpeedAct0 input to TRUE. When the controller is enabled, the nNOut_a
speed signal is integrated.
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