A32422 — Encoder 2: Pulses per revolution square-wave encoder outside tolerance bandwidth

A32422 is an alarm from Encoder 2: the pulses per revolution of the connected square-wave encoder are outside the tolerance bandwidth. In concrete terms, the zero mark distance the drive measures does not correspond to the zero mark distance that is parameterized. The monitoring only takes effect when square-wave encoder PPR correction is active and fault 31131 has been re-parameterized; the alarm is then raised as soon as the accumulator contains larger values than the thresholds p4683 or p4684. For a rotary encoder, the zero mark distance used for zero mark monitoring is set in p0425. Depending on the drive configuration, the same condition can also be output as a fault or as a message with no reaction.

• The measured zero mark distance does not correspond to the parameterized zero mark distance.
• The alarm only becomes active with square-wave encoder PPR correction and re-parameterized fault 31131, when the accumulator contains larger values than p4683 or p4684.

1. Check that the encoder cables are routed in compliance with EMC.
2. Check the plug connections.
3. Check the encoder type — the encoder must have equidistant zero marks.
4. Adapt the parameter for the distance between zero marks (p0424, p0425).
5. Replace the encoder or the encoder cable.

The drive writes the accumulated differential pulses in encoder pulses into the alarm value; it is stored in r2124 and is to be interpreted as a decimal number.

• r2124 (interpret decimal): accumulated differential pulses in encoder pulses

• p0424 — encoder linear zero mark distance: the parameter for the distance between zero marks that the remedy names for adaptation on a linear encoder.
• p0425 — encoder rotary zero mark distance: sets the zero mark distance for zero mark monitoring of a rotary encoder; adapt it when the measured distance deviates.
• p4683 — zero mark monitoring tolerance window alarm threshold positive: the alarm is raised when the accumulated differential pulses are larger than this positive threshold.
• p4684 — zero mark monitoring tolerance window alarm threshold negative: the corresponding negative threshold of the tolerance window.
• r2124 — alarm value: shows the accumulated differential pulses in encoder pulses for this alarm, to be read as a decimal number.

As an alarm, A32422 requires no acknowledgment and does not switch the drive off by itself. If the drive is configured so that the same condition appears as a fault instead, the fault must be acknowledged IMMEDIATELY before the drive can be restarted. The condition ends once the measured zero mark distance again corresponds to the parameterized one.