Siemens SIDOOR AT40 System Manual page 95

Shutdown/deceleration functions
In an unlimited system, the shutdown and deceleration functions are split into the following:
"rapid stop", "ramp stop" and "coasting down". These definitions do not apply in a door
system because these are to be considered as limited systems.
Table 6- 9 Shutdown/deceleration functions in an unlimited system
Function Description
Rapid stop Decelerates the drive to standstill with the maximum braking ramp (taking into account technical and
safety-related limit areas).
Ramp stop Same meaning as rapid stop, but a configured ramp is used to decelerate the drive to standstill.
Coasting down The drive is not actively braked, it can run freely and is only slowed by the friction inherent in the
system (e.g. gearing).
In SIDOOR systems, coasting down is equivalent to the Deenergize (no current) door
command. For safety reasons, however, direct coasting down must not take place due to the
limits implemented in a door system (safety reasons). This is why the following definitions
apply to the SIDOOR door drive:
Table 6- 10 SIDOOR door drive shutdown/deceleration functions (limited system)
Function Description
Not a door com- Decelerates the drive to standstill with a configured ramp (p3674 "DecRampOp" or p3677
mand/Deenergize "DecRampCls") and then assumes free running mode.
Special stop
Stop Decelerates the drive to standstill with a configured ramp (p3674 "DecRampOp" or p3677
"DecRampCls") and then assumes virtual short-circuit mode (50 % PWM → source voltage brake
active).
Reverse Direction of travel reversal by local sensor (e.g. light curtain and pressure-sensitive edge) or "Open →
Close" or "Close → Open" drive order change.
Decelerates the drive to standstill with a configured ramp (p3675 "RevRampOpToCls" or p3678
"RevRampClsToOp"). The following behavior is dependent on the current system status.
AT40, ATD400V, ATD400K, ATD4xxW, ATD400S, ATE250S, ATD400T
System Manual, 06/2016, A2B00096162-AN
Controllers
6.2 Drive functions
95