Lenze EVS 9300 series, System Manual

Page: 240 / 504

Function library
Function blocks
9.2.28 Digital frequency processing (DFSET)
9-114
L
EDSVS9332S-D11 EN 3.0
9.2.28.4 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, one for the actual pulses (X5/E4) via C0546 and one for
the setpoint pulses (X5/E5) via C0551.
9300STD340
X5/E4
X5/E5
0
0
ƒ
ƒ
  
‚ ‚ ‚ ‚ ‚ ‚ ‚
„
„

C0546
C0551
‚
Fig. 9-72 Masking of interference pulses for setpoint and actual pulses

Variations of the actual/setpoint pulses
c Actual pulses at X5/E4
d
Setpoint pulses at X5/E5
e
Interference pulse in the masked area is filtered out
f 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.
– Code C0528/4 indicates the number of increments between two actual pulses at X5/E4.
– Code C0528/3 indicates the number of increments between two setpoint pulses at X5/E5.
2. Set the size of the masking window, considering the variation limits. The higher the limits the
smaller the masking window must be set.
– Via C0546 the size of the masking window between two actual pulses is set by the number
of pulses at X5/E4.
– Via C0551 the size of the masking window between two setpoint pulses is set by the number
of pulses at X5/E5.
– Consider the division factors C0531 and C0535 when setting the masking windows.