Functions
8.18 Fail-safe functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-103
8.18.2 Limiting values for SS1 and SLS
Maximum fault reaction time
The maximum fault reaction time during active safe braking ramp (used in SS1 and SLS) is
given as delay from crossing the parameterised envelope until triggering an LSTO.
actual
fr equency
W
I
setpoint
fr equency
fault
reac-
tion
time
Δt
react.
time
envelope
delay
Δt
envelope
envelope
LSTO limit
Figure 8-67 Maximum shut-dowwn time
Description
When parameterising the limiting envelope for SLS and SS1 with P9680/P9880 and
P9691/P9891 the following minimum tolerances should be considered to provide maximum
performance of the drive:
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