F30688 — SI Motion P2: Actual value synchronization not permissible

F30688 is a Safety Integrated fault of the SI Motion P2 group: the function “actual value synchronization” has been enabled in a combination that the drive does not permit. The manual lists three such inadmissible combinations (see causes below); the drive object then coasts down (OFF2) and the fault additionally results in a STOP A that cannot be acknowledged. The G130/G150 and S120/S150 entries describe the condition identically, so the same checking procedure applies on every family. The manual prints no message value for this fault, so the value display carries no further diagnostic information.

• Actual value synchronization has been enabled although the drive is set up as a 1-encoder system; the function is only permissible in a 2-encoder system.
• Actual value synchronization and a monitoring function with absolute reference — SCA (Safe Cam) or SLP (Safely-Limited Position) — have been enabled at the same time.
• Actual value synchronization and safe position via PROFIsafe (SP: Safe Position) have been enabled at the same time.

1. Check in p9501 which SI Motion safety functions are enabled in the Control Unit and whether actual value synchronization is among them.
2. Resolve the encoder question: either deselect actual value synchronization, or parameterize a 2-encoder system — the encoder for the second channel is assigned in p9526.
3. If a monitoring function with absolute reference (SCA/SLP) is enabled, deselect either this monitoring function or actual value synchronization — both together is not permissible.
4. If safe position via PROFIsafe is enabled, deselect either actual value synchronization or this function.
5. Carry out a POWER ON so that the corrected configuration is accepted.

• p9501 — SI Motion enable safety functions (Control Unit): here you see which SI Motion functions are enabled and deselect any function that may not be combined with actual value synchronization.
• p9526 — SI Motion encoder assignment second channel: here the second-channel encoder is assigned, which is what a 2-encoder system requires if actual value synchronization is to remain enabled.

A simple acknowledge does not clear F30688; the fault is acknowledged by POWER ON — the drive must be switched off and on again after the inadmissible combination has been removed. The STOP A that the fault triggers cannot be acknowledged either, so the stop also ends only once the parameterization has been corrected and the POWER ON has been carried out.