F07435 — Drive: Setting the ramp-function generator for sensorless vector control

The drive raises F07435 when the ramp-function generator is operated in a way that sensorless vector control does not permit: during operation with sensorless vector control (r1407.1) the ramp-function generator was stopped (p1141) or bypassed (p1122), and an internal setting command of the ramp-function generator output froze the setpoint speed — or the command was not able to be realized. Depending on the drive's configuration, the same condition can also be issued with no reaction (N).

• During operation with sensorless vector control (r1407.1) the ramp-function generator was stopped (p1141): an internal setting command of the ramp-function generator output caused the setpoint speed to be frozen (the S120/S150 and G130/G150 descriptions add: or the command was not able to be realized).
• In the S120/S150 and G130/G150 descriptions the cause list is broader: the ramp-function generator was bypassed (p1122) during sensorless vector operation.
• Also for these drive objects: the drive is switched on with flying restart activated (p1200) and the ramp-function generator is bypassed (p1122) at the same time.

1. Deactivate the holding command for the ramp-function generator (p1141) so it is no longer stopped during sensorless vector operation.
2. Do not bypass the ramp-function generator (p1122) — this step comes from the S120/S150 and G130/G150 remedy.
3. If the ramp-function generator is held using jogging while the speed setpoint is simultaneously inhibited (r0898.6), suppress the fault via p2101 and p2119 — the manual calls this necessary in exactly that case.
4. Check the setpoint routing: for sensorless vector control it is not practical to read in the main setpoint of the speed control via p1155 or p1160 (p0922). Inject the main setpoint before the ramp-function generator (p1070) instead, because the RFG output is set automatically when transitioning from closed-loop speed controlled into open-loop speed controlled operation.

• Message value “Parameter: %1” — the value identifies the parameter concerned. The manual prints no bit-by-bit decoding for it.

• p1141 (BI, continue/freeze ramp-function generator): the holding command that stops the RFG; deactivating it is the first remedy step.
• p1122 (BI, bypass ramp-function generator): must not be active here; bypassing the RFG — including at switch-on with flying restart — is named as a cause for the affected drive objects.
• p1200: named in the cause — the fault also occurs when the drive is switched on with flying restart activated while the RFG is bypassed.
• p2101 (change fault response): together with p2119, the pair the remedy names for suppressing this fault.
• p2119 (change message type): the second parameter for suppressing the fault.
• p1155 (CI, speed controller speed setpoint 1): not a practical path for the main setpoint with sensorless vector control.
• p1160 (CI, speed controller speed setpoint 2): same — avoid reading the main setpoint in here for sensorless vector control.
• p0922 (IF1 PROFIdrive PZD telegram selection): cited in the note together with the p1155/p1160 setpoint path it advises against.
• p1070 (CI, main setpoint): where the main setpoint should be injected — before the ramp-function generator — for sensorless vector control.

The fault response trips the drive to OFF2, so the motor coasts down. Once the cause has been removed, acknowledge the fault immediately — only then will the drive restart. Where the drive's configuration outputs the condition as N, there is neither a reaction nor an acknowledgement.