F33100 — Encoder 3: Zero mark distance error

F33100 reports that the zero mark distance measured on Encoder 3 does not correspond to the zero mark distance parameterized in the drive. The monitoring distance is set in p0425 for a rotary encoder and in p0424 for a linear encoder. For distance-coded encoders the zero mark distance is determined from pairs of detected zero marks; depending on how the pairs are generated, a single missing zero mark may not produce this fault and also has no effect in the system. The same condition can also be issued as an alarm (A) or without any reaction (N), depending on the drive's configuration; in those cases neither an automatic reaction nor an acknowledgment occurs.

• The zero mark distance measured by the drive does not correspond to the parameterized zero mark distance (p0425 for a rotary encoder, p0424 for a linear encoder).
• For distance-coded encoders the zero mark distance is determined from detected zero mark pairs; depending on the pair generation, a missing zero mark cannot result in this fault and has no effect in the system.

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 parameterized distance between zero marks: p0424 for a linear encoder, p0425 for a rotary encoder.
5. If the message is output above a speed threshold, reduce the filter time in p0438 if necessary.
6. Replace the encoder or the encoder cable.

• The drive writes the fault value to r0949; interpret it as a decimal number.
• The value is the last measured zero mark distance in increments.
• 4 increments correspond to 1 encoder pulse.
• The sign of the value designates the direction of motion when the zero mark distance was detected.

• p0424 — parameterized zero mark distance for a linear encoder; set it to the value the zero mark monitoring compares against.
• p0425 — parameterized zero mark distance for a rotary encoder; adapt it when the measured distance deviates.
• p0438 — square-wave encoder filter time; reduce it if the message is output above a speed threshold.
• r0949 — fault value; read the last measured zero mark distance from it in decimal interpretation.

As a fault, F33100 stops the drive with OFF1 and is acknowledged once pulses are inhibited (PULSE INHIBIT); the drive can then be restarted. When the same condition is configured as an alarm (A) or without a reaction (N), the drive takes no automatic action and no acknowledgment is required.