A31411 — Encoder 1: Absolute encoder signals internal alarms

A31411 is output when the absolute encoder connected as Encoder 1 signals an internal alarm: the encoder's fault word includes alarm bits that have been set, and the drive takes this word over as the alarm value in r2124. The alarm condition therefore arises inside the encoder itself, which passes it to the drive in its fault word. Depending on how the drive is configured, the same condition can also be output as a fault (F) or with no reaction (N) instead of as this alarm.

• The absolute encoder reports an internal condition: its fault word contains alarm bits that have been set, and the drive signals these as A31411.
• Which internal condition the encoder is reporting — for example a discharged battery, an exceeded temperature, speed too high or an error in an internal encoder interface — is shown by the set bit in the alarm value r2124 (see the decoding under Message value).

1. Read the alarm value in r2124 and interpret it in binary: the word is structured yyyyxxxx (hex), with xxxx = fault cause and yyyy = supplementary information.
2. Match the set bit against the decoding in the next section to see which internal alarm the encoder is signalling.
3. Check the encoder fault response configured in p0491, which the manual cross-references for this code.
4. Replace the encoder — this is the remedy the manual gives for this code.

The message value carries two items: the fault cause (%1, output in binary) and the additional information (%2). Both come from the alarm value in r2124, which the manual interprets in binary as yyyyxxxx (hex): yyyy = supplementary information, xxxx = fault cause. The set bits mean:

• yyyy = 0:
  • Bit 0: Frequency exceeded (speed too high).
  • Bit 1: Temperature exceeded.
  • Bit 2: Control reserve, lighting system exceeded.
  • Bit 3: Battery discharged.
  • Bit 4: Reference point passed.
• yyyy = 1:
  • Bit 0: Signal amplitude outside the control range.
  • Bit 1: Error multiturn interface.
  • Bit 2: Internal data error (singleturn/multiturn not with single steps).
  • Bit 3: Error EEPROM interface.
  • Bit 4: SAR_converter error.
  • Bit 5: Fault for the register data transfer.
  • Bit 6: Internal error identified at the error pin (nErr).
  • Bit 7: Temperature threshold exceeded or fallen below.

• r2124 (Alarm value): holds the encoder's alarm word for this code — read it in binary and split it as yyyyxxxx (hex) to identify the set alarm bit (fault cause) and the supplementary information.
• p0491 (Motor encoder fault response ENCODER): the manual cross-references this parameter for the code; check here how the drive is configured to respond when the motor encoder reports this condition.

As the alarm A31411, the code requires no acknowledgement. If the drive configuration raises the same condition as a fault instead, the manual requires an IMMEDIATE acknowledgement, and the reaction printed for the affected drive object takes effect. With the N variant, the drive takes no action and nothing needs to be acknowledged. Once the encoder has been replaced — the manual's remedy — the drive can be restarted.