What it means
Alarm A05003 reports that the temperature inside the power unit has reached the alarm threshold for internal overtemperature. It is an early warning rather than a trip: the drive raises the alarm first and only triggers fault F30036 if the temperature inside the power unit increases by an additional 5 K. Depending on how the drive is configured, the same condition can also be output with no reaction (N).
Why it appears
- The alarm threshold for internal overtemperature inside the power unit has been reached.
- For chassis power units, the manual states this threshold condition as the trigger for the message.
What to check
- Check whether the ambient temperature is within the defined limit values.
- Check whether the fan has failed.
- Check the fan's direction of rotation.
Acknowledging and restarting
No acknowledgement is required for this message. What matters is acting on the cooling side while the alarm is standing: bring the ambient temperature back within the defined limit values and make sure the fan is working and turning in the correct direction. If the temperature inside the power unit increases by a further 5 K before this is done, the drive triggers fault F30036.
What differs between the drive families
Straight from the manuals' own fields — A05003 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | Power electronics faulted (5) | Power Module | SINAMICS S120, S150 List Manual · p. 2746 |
| G130, G150 | NONE | NONE | Power electronics faulted (5) | Power Module | SINAMICS G130, G150 List Manual · p. 1519 |
| G120XA | NONE | NONE | — | — | SINAMICS G120XA PN converter · p. 1118 |
The drives this code lives on
A05003 is described for G120XA, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A05003 mean on a SINAMICS drive?
The power unit has reached its alarm threshold for internal overtemperature. It is a warning stage — the drive only triggers fault F30036 if the internal temperature rises by an additional 5 K.
How do I fix alarm A05003?
Check that the ambient temperature is within the defined limit values, that the fan has not failed, and that it rotates in the correct direction. The message itself requires no acknowledgement.
Does A05003 stop the drive?
No — A05003 is an alarm. The trip comes only as fault F30036, and only if the temperature inside the power unit increases by a further 5 K.
Can A05003 appear without any reaction?
Yes. Depending on the drive's configuration, the same overtemperature condition can also be output with no reaction (N).
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 A05xxx group · SINAMICS manuals · Siemens manuals