Корзина

  • Sheave check – Rotate by hand; feel for rough spots or debris in grooves.
  • Guide rail & shoe – Measure gib clearance (0.5–1.0 mm). Excess clearance causes lateral scratching.
  • Controller memory – Use Otis Service Tool (GTS) to read:

    • The Otis Gen2 motor is a permanent magnet synchronous machine (PMSM). If the brake is not fully releasing (due to a failed brake rectifier or worn brake shoe), the rotor rubs against the stator or the stationary brake pads.

    | Fault Code | Description | Typical Cause | |------------|-------------|----------------| | 1301 | Scratch memory checksum error | Battery backup failure, low voltage during reboot | | 1302 | Invalid scratch parameter range | Manual edit error, corrupted download | | 2103 | Door timing scratch mismatch | Door operator settings lost after power cycle | | 2400 | Drive tuning scratch lost | Encoder/belt replacement without re-learn |

  • In Gen2 controllers, a “scratch fault” or “scratch checksum error” indicates that stored data has been corrupted or altered unexpectedly.

    • If you are responding to a "Scratch" complaint, follow this systematic approach using the Otis Service Tool (S/T or Compass).

    Otis Gen2 Scratch

  • Sheave check – Rotate by hand; feel for rough spots or debris in grooves.
  • Guide rail & shoe – Measure gib clearance (0.5–1.0 mm). Excess clearance causes lateral scratching.
  • Controller memory – Use Otis Service Tool (GTS) to read:

    • The Otis Gen2 motor is a permanent magnet synchronous machine (PMSM). If the brake is not fully releasing (due to a failed brake rectifier or worn brake shoe), the rotor rubs against the stator or the stationary brake pads.

    | Fault Code | Description | Typical Cause | |------------|-------------|----------------| | 1301 | Scratch memory checksum error | Battery backup failure, low voltage during reboot | | 1302 | Invalid scratch parameter range | Manual edit error, corrupted download | | 2103 | Door timing scratch mismatch | Door operator settings lost after power cycle | | 2400 | Drive tuning scratch lost | Encoder/belt replacement without re-learn |

  • In Gen2 controllers, a “scratch fault” or “scratch checksum error” indicates that stored data has been corrupted or altered unexpectedly.

    • If you are responding to a "Scratch" complaint, follow this systematic approach using the Otis Service Tool (S/T or Compass).

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