What it means
F07898 reports that a flying restart did not succeed. During the flying restart, the drive determines the rotor position of a separately excited synchronous motor from voltage measurements. This identification only works if the motor has built up sufficient flux. The drive raises the fault when the flux was still too low once the set excitation time had elapsed.
Why it appears
- The rotor position of a separately excited synchronous motor is being identified from voltage measurements.
- The set excitation time elapsed while the motor flux was still too low, so the position identification failed.
What to check
- Check the excitation build-up time currently set in p0346 for the connected motor.
- Increase the excitation time in p0346 so that the separately excited synchronous motor has built up enough flux by the end of the excitation phase, before the rotor position identification takes place.
Parameters the manual names
- p0346 — Motor excitation build-up time: increase this time so the flux is high enough when the rotor position identification is carried out for this fault not to recur.
Acknowledging and restarting
The drive will not start again until this fault has been acknowledged. Once the excitation build-up time in p0346 has been increased, acknowledge the fault and attempt the flying restart again.
The same on every family
Every manual that describes F07898 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | OFF2 | IMMEDIATELY | Motor overload (8) | Control Unit (CU) | SINAMICS G130, G150 List Manual · p. 1603 |
| S120, S150 | OFF2 | IMMEDIATELY | Motor overload (8) | Control Unit (CU) | SINAMICS S120, S150 List Manual · p. 2872 |
The drives this code lives on
F07898 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F07898 mean on a SINAMICS drive?
It means a flying restart was unsuccessful: after the set excitation time had elapsed, the flux of the separately excited synchronous motor was too low to identify the rotor position from the voltage measurements.
How do I fix fault F07898?
Increase the motor excitation build-up time in p0346, then acknowledge the fault and repeat the flying restart.
Which parameter belongs to fault F07898?
p0346, the motor excitation build-up time; raising its value gives the motor more time to build up flux before the rotor position identification starts.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the F07xxx group · SINAMICS manuals · Siemens manuals