Siemens SINAMICS S150 Operating Instructions Manual page 375

input p2597 (homing type selection). The signal in binector input p2595 (start homing) must
be set during the entire referencing process otherwise the process is aborted. Once started,
the status signal r2684.11 (reference point set) is reset.
During the entire search for reference, monitoring of the software limit switches is inactive;
only the maximum traversing range is checked. If necessary, monitoring of the software limit
switches is reactivated once complete.
The velocity override set is only effective during the search for the reference cam (step 1).
This ensures that the "cam end" and "zero mark" positions are always overrun at the same
speed. If signal propagation delays arise during switching processes, this ensures that the
offset caused during establishment of position is the same in each homing process.
Axes which only have one zero mark over their entire traversing and/or modulo range, are
identified using parameter p2607 = 0 (reference cam present). After starting the homing
process, synchronization to the reference zero marks is started straight away (see step 2) for
these axes.
● Search for reference, step 1: travel to reference cam
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
If there is no reference cam present (p2607 = 0), go to step 2.
When the homing process is started, the drive accelerates at maximum acceleration
(p2572) to the reference cam approach velocity (p2605). The direction of the approach is
determined by the signal of binector input p2604 (search for reference start direction).
The drive is informed that the reference cam has been reached by the signal at binector
input p2612 (reference cam). The drive is then decelerated to a standstill using the
maximum delay (p2573).
If a signal at binector input p2613 (reversing cam, minus) or at binector input p2614
(reversing cam, plus) is detected during the search for reference, the search direction is
reversed. The reversing cams are low active cams. If both reversing cams are active
(p2613 = "0" and p2614 = "0"), the drive remains stationary. As soon as the reference
cam is found, synchronization to the reference zero mark begins immediately (see step
2).
If the axis leaves its start position and travels the distance defined in parameter p2606
(max. distance to reference cam) heading towards the reference cam without actually
reaching the reference cam, the drive remains stationary and fault F07458 (reference
cam not found) is issued.
When starting the homing process, if the axis is already at the cam, it does not have to
travel to the reference cam and instead synchronization to the reference zero mark is
started straight away (see step 2).
Functions, monitoring, and protective functions
9.4 Extended functions
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