Officially, P.831 is labeled "Transient Harmonic Damping." Unoffically, technicians call it "The Latch."
The item is a Bosch Rexroth Linear Servo Motor (IndraDyn S) . It is a small-frame, air-cooled motor designed for precise linear motion, requiring a compatible IndraDrive amplifier to function. clm 01.3-x-e-2-0-fw
In one German printing plant, a unit that had been powered off for six months suddenly tried to complete a "home" routine at 3:00 AM, spinning a roller with enough force to dent a steel beam. The log file simply read: "CLM 01.3-X-E-2-0-FW: Replay complete." Officially, P
If you set P.831 too high, the drive doesn't stall. It anticipates a stall and reverses polarity violently. Engineers have lost fingers to this. One service manual from 2005 explicitly warns: "Do not adjust P.831 while the load is suspended." The log file simply read: "CLM 01