7
Operation
DynaStop® in conjunction with STO
Operating Instructions – MOVIMOT
®
flexible
188
The following figure shows the behavior when STO is activated before rotational
speed "0" is reached:
Deceleration
ramp
Speed
Drive enable
Control signal
STO
DynaStop
®
active
inactive
t
t
1
t
t
2
[2]
[2]
[1]
[1]
30807229195
[1] Parameter:
Apply brake/activate DynaStop
®
in STO state = "0" (no) factory settings
[2] Parameter:
Apply brake/activate DynaStop
®
in STO state = "1" (yes)
(Path: Functions > Drive functions > FCB01 Output stage inhibit > Brake/
DynaStop
®
)
t Time
t
1
Point of time when deceleration ramp is initiated
t
2
Point of time when STO is triggered
Δt Time span between initiating the deceleration ramp and STO
Safe time delay range
Range with active, safety-related STO function
Activating the STO function during the deceleration ramp aborts controlled decelera-
tion:
Possible reasons for premature activation of STO:
• Deceleration time Δt too short
• Extension of the deceleration ramp when the current limit is reached, e.g. due to
too high load
29129451/EN – 12/2019
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