A32811 — Encoder 2: Encoder serial number changed

A32811 is signalled by Encoder 2 when the serial number the encoder now delivers no longer matches the serial number stored in the drive. The drive only performs this comparison on encoders that actually provide a serial number, so for encoders without one no such check takes place. The manual names exactly one situation in which the serial number changes: the encoder was replaced. Depending on how the drive is configured, the same condition can also be signalled as a fault or only noted without any reaction.

• The encoder serial number has changed; the drive only checks this on encoders that deliver a serial number.
• The encoder was replaced.

1. Establish whether the encoder was replaced — this is the only cause the manual names for a changed serial number.
2. Mechanically adjust the encoder, then accept its new serial number by setting p0440 = 1.
3. With closed-loop position control, note how the adjustment status p2507 interacts with the serial number: it is accepted when the adjustment is started (p2507 = 2), and once the encoder is adjusted (p2507 = 3) the drive checks the serial number for changes and resets the adjustment (p2507 = 1) if it detects one.
4. If serial number monitoring should not raise this message again, hide it: in the corresponding encoder data set, enter the serial number as p0441 = FF, p0442 = 0, p0443 = 0, p0444 = 0, p0445 = 0.

• p0440 (Copy encoder serial number) — set to 1 so the drive accepts the encoder's new serial number.
• p0441 (Encoder commissioning serial number part 1) — set to FF, together with the parts below, to hide serial number monitoring.
• p0442 (Encoder commissioning serial number part 2) — set to 0 when hiding serial number monitoring.
• p0443 (Encoder commissioning serial number part 3) — set to 0 when hiding serial number monitoring.
• p0444 (Encoder commissioning serial number part 4) — set to 0 when hiding serial number monitoring.
• p0445 (Encoder commissioning serial number part 5) — set to 0 when hiding serial number monitoring.
• p2507 (LR absolute encoder adjustment status) — shows where the absolute encoder adjustment stands: the new serial number is accepted when the adjustment starts (p2507 = 2), and from p2507 = 3 a changed serial number resets the adjustment (p2507 = 1).

Once the encoder has been mechanically adjusted and its new serial number accepted with p0440 = 1 — or serial number monitoring has been hidden with the settings above — the cause is gone and the message no longer appears. While the drive signals the condition as an alarm there is nothing to acknowledge; when the drive signals it as a fault, acknowledge it straight away before restarting the drive.