Siemens SIDOOR ATD4 W Series - Combination of Retry and Reverse; Slow Obstruction Approach

A variable wait time can be con󹪝gured (p3865 and p3882) after each retraction attempt (on
reaching the corresponding reverse target position). The drive remains stopped during the wait
time.
The reversing distance or the type of reverse (full or partial reverse) can be con󹪝gured to an
accuracy of ±2 cm in parameters p3866 and p3883.
If the system is blocked during reversing, all reversing processes that are still open are
terminated immediately and wait mode is activated (see Wait mode (Page 90)). A following
drive order can also be con󹪝gured in parameters p3867 and p3884, which is activated at the
same time as the switch to wait mode.
After the con󹪝gured number of reversing operations/retraction attempts have been made, wait
mode is activated (see Wait mode (Page 90)). A following drive order can also be con󹪝gured,
which is activated at the same time as the switch to wait mode (p3868 and p3885).
While the obstruction reversing system is active, any change in an external drive order (see Table
A-16 DCMD signal (Page 319)) immediately ends all open reversing actions (including the
cancelation of wait mode).
Note
A reverse due to a drive order being changed is part of the basic software, and is not a󹪜ected by
the reversing on account of an obstruction described here (Open → Close, Close → Open).
4.3.8.4 Combination of retry and reverse
The reverse and retry systems can be combined. The combination is subject to the following
rules:
• A reverse is made after executing the con󹪝gured number of retries. The action is repeated for
the number of con󹪝gured reverses.
• Parameters p3863 and p3880 have no e󹪜ect when reversing is activated.
• Wait mode becomes active after the last reverse.
• If the number of retries and reversing operations is set to "0", the "retry" following drive order
has a higher priority than the "reverse" drive order.
4.3.8.5 Slow obstruction approach
The position of the last obstruction in the drive direction is automatically stored in the system.
The speed is automatically reduced to the corresponding creep speed (p3670 or p3666) on
approaching this position. The system calculates a braking ramp so that the reduced speed is
reached at the set distance (parameter p3855 or p3872) from the stored position of the
obstruction. If the obstruction can be overcome, the system adjusts the speed after the same
distance back to the "normal" driving curve.
Slow obstruction approach can be activated or deactivated for each drive direction in parameter
p3850.
SIDOOR functions
4.3 Extended functions
ATD4xxW for industrial applications
System Manual, 06/2022, A5E51901827B AA 89