Lenze EVS9332xS - Manual (Page 132)

Function library
Function blocks
3.2.27 Digital frequency processing (DFSET)
3−80
l
EDSVS9332S−EXT EN 2.0
3.2.27.4 Suppressing fault signals when synchronising via touch probe
Interference pulses which act on the actual pulse and setpoint pulse signal at the inputs X5/E4 and
X5/E5 can cause unwanted transients and faulty functions.
As of software version 6.2 it is possible to filter interference pulses via masking windows, thus
reducing interferences by up to 90%, depending on the application.
The masking windows can be set separately, for the actual pulses (X5/E4) via C0551 and for the
setpoint pulses (X5/E5) via C0546.
9300STD340
X5/E4
X5/E5
0
0
ƒ
ƒ
  
‚ ‚ ‚ ‚ ‚ ‚ ‚
„
„

C0551
C0546
‚
Fig. 3−72 Masking of interference pulses for setpoint and actual pulses
0 Variations of the actual / setpoint pulses
 Actual pulses at X5/E4
‚ Setpoint pulses at X5/E5
ƒ Interference pulse in the masked area is filtered out
„ Interference pulse in a non−masked area causes transients
Setting of masking window
1. Measure the number of increments between two pulses. Since the number varies depending
on the application, the variation limits must be detected and considered when setting the
masking windows.
– C0528/4 displays the number of increments between 2 actual pulses at X5/E4 (e.g. motor
increments).
– C0528/3 displays the number of increments between 2 setpoint pulses at X5/E5 (e.g. master
increments).
2. Set the size of the masking window, considering the variation limits. The higher the limits the
smaller the masking window must be set.
– In C0551 the size of the masking window between 2 actual pulses at X5/E4 can be set by
entering the corresponding number of increments.
– In C0546 the size of the masking window between 2 setpoint pulses at X5/E5 can be set by
entering the corresponding number of increments.
– Consider the division factors C0531 and C0535 when setting the masking windows.
)
Note!
l The range to be masked out (masking windows C0546 and C0551) starts with the
first touch probe pulse and restarts with every new touch probe pulse.
Modifications of the masking window via C0546 or C0551 are accepted
immediately.
l If very low speeds are used, the masking window in C0551 should be set to
1 increment to prevent that actual pulses are classified as interference pulses.