Operating instructions

Functions, monitoring, and protective functions
9.4 Extended functions
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
383
at binector input p2597 (referencing type selection). The signal in binector input p2595 (start
referencing) 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 reference point approach, 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 referencing 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 referencing
process, synchronization to the reference zero marks is started straight away (see step 2) for
these axes.
● Reference point approach, step 1: travel to reference cam
If there is no reference cam present (p2607 = 0), go to step 2.
When the referencing 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 (reference point approach 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 reference point approach, the search
direction is reversed.
If the "reversing cam, minus" is approached in the positive direction, or the "reversing
cam, plus" is approached in the negative direction, fault F07499 (EPOS: reversing cam
approached with wrong traversing direction) is output. In this case, the wirng of the
reversing cam (p2613, p2614) and/or the traversing direction for approaching the
reversing cam must be checked.
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,
then synchronization to the reference zero mark is immediately started (refer to 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 referencing 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).