F07752 — Drive: Piston position not possible

F07752 means the drive cannot use the piston position. The piston has been calibrated — the zero point calibration value in p0476 is not 0 — and the absolute position is available (p1407.3 = 1), yet the piston position actual value r0094 is not plausible: it is negative or higher than the cylinder piston stroke set in p0313. The same condition can also be issued as an alarm (A); in that case the manual notes there is no reaction and nothing to acknowledge.

• The piston has been calibrated (p0476 is not 0) and the absolute position is available (p1407.3 = 1), so the drive expects a usable piston position.
• Despite this, the piston position actual value r0094 is not plausible: it is negative or higher than the cylinder piston stroke set in p0313.

1. Check the position inversion (p0410.1).
2. Check the direction convention: r0094 must be zero when the piston is located at the A side, and when moving from the A to the B side, the velocity and position increase must be positive.
3. Check the piston calibration; if required, recalibrate the piston with the piston at the A side (p1909.1 = 1).
4. If the encoder has been replaced, recalibrate the piston.
5. If the machine zero point has been shifted, recalibrate the piston.

• p0476 (Piston zero point calibration value): the stored calibration value; it must be set to 0 before this fault is acknowledged, and a value not equal to 0 shows the piston has been calibrated.
• r0094 (CO: Piston position actual value): the piston position the drive judges; it must read zero at the A side and must not be negative or higher than the stroke.
• p0313 (Cylinder piston stroke): the upper limit of plausibility; r0094 must not exceed the stroke entered here.
• p0410 (Encoder inversion actual value): check the position inversion at p0410.1 as the first remedy step.
• p1909 (Data identification without enabling activation): set p1909.1 = 1 to recalibrate the piston with the piston at the A side, completely retracted.
• p1959 (Data identification moving configuration): set p1959.2 = 1 as the alternative way to start the new calibration.
• p1960 (Moving measurement selection): set p1960 = 1 together with p1959.2 for that calibration.

The manual prescribes the sequence: Before acknowledging the fault, set p0476 = 0. Then calibrate the piston again — either set p1909.1 = 1 with the piston completely retracted, or set p1959.2 = 1 and p1960 = 1. Recalibration is also required whenever the encoder has been replaced or the machine zero point has been shifted.