7
Operation
DynaStop® in conjunction with STO
Operating Instructions – MOVIMOT
®
flexible
194
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
29128668/EN – 12/2019
