Functions
8.18 Fail-safe functions
Control Units CU240S
8-106 Operating Instructions, 11/2006, A5E00766042B AA
maximum application related
reachable frequency F
max
reached
actual
fr equency
W
I
setpoint
fr equency
fault
reac-
tion
time
Δt
react.
time
envelope
delay
Δt
envelope
shifted envelope
LSTO limit
Figure 8-69 Maximum fault reaction time
The maximum envelope shift corresponds to the fault reaction time ∆t reactiontime
(maximum LSTOlimit) wich is given as:
ෙW
UHDFWLRQWLPH
)
PD[UHDFK
)
PD[
P
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