What it means
The drive reports A49173 as an alarm from the cooling unit: the temperature of the cooling liquid at the intake of the unit has risen above the alarm threshold that applies to the connected power unit.
The threshold is not a fixed value. It depends on the power unit and is stored in its hardware description data; the manuals give e.g. 42 ... 50 °C as typical values. While the alarm is active the drive itself takes no action, and no acknowledgement is required — the alarm clears on its own once the intake temperature falls back below the threshold.
Why it appears
- The cooling liquid intake temperature has risen above the alarm threshold specified for the power unit.
What to check
- Check the cooling system.
- Check the ambient conditions.
Acknowledging and restarting
A49173 needs no acknowledgement. As an alarm it resets itself as soon as the cooling liquid intake temperature drops back below the alarm threshold. If the alarm stays on, the intake temperature is still too high, and the cooling system and the ambient conditions should be checked.
The same on every family
Every manual that describes A49173 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Auxiliary unit faulted (20) | None | SINAMICS S120, S150 List Manual · p. 3290 |
| G130, G150 | NONE | NONE | Auxiliary unit faulted (20) | None | SINAMICS G130, G150 List Manual · p. 1934 |
The drives this code lives on
A49173 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 alarm A49173 mean on a SINAMICS S120 or G150?
The cooling unit reports that the cooling liquid intake temperature has exceeded the alarm threshold specified for the power unit. That threshold is hardware-dependent, e.g. 42 ... 50 °C.
How do I clear alarm A49173?
You do not have to acknowledge it; it clears itself once the intake temperature falls back below the threshold. Until then, check the cooling system and the ambient conditions.
What is the alarm threshold behind A49173?
There is no single value — it depends on the power unit and is stored in its hardware description data. The manuals give e.g. 42 ... 50 °C.
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 A49xxx group · SINAMICS manuals · Siemens manuals