What it means
Alarm A30066 comes from the Power Module: the air discharged from the DC link capacitor has exceeded the alarm threshold — in other words, the cooling air leaving the capacitor is warmer than permitted. Depending on the drive's configuration, the same condition can also be issued with no reaction (N) instead of this alarm. The drive takes no automatic action while the alarm is standing, but the situation can worsen: if operation is unchanged, the permissible limit value can be exceeded, the drive then outputs fault F30067 and inhibits the pulses.
Why it appears
- The ambient temperature is too high.
- Cooling is insufficient — for example, a fan has failed.
What to check
- Check that the fan is actually running.
- Inspect the fan elements.
- Verify that the ambient temperature lies within the permissible range.
Reading the message value
- The drive stores the alarm value in r2124; this is the %1 shown as the message value.
- Interpret the value in r2124 as a decimal number: it is the temperature when the alarm threshold was reached, given in 0.01 °C.
Parameters the manual names
- r2124 — after the alarm, read here the temperature at which the alarm threshold was reached; interpret the value as decimal, in 0.01 °C.
Acknowledging and restarting
No acknowledgement is needed and there is nothing to reset by hand: This alarm is only withdrawn after the alarm threshold has been fallen below - and the corresponding hysteresis.
Remove the cause first — fan running again, cooling restored, ambient temperature back in the permissible range — so the temperature actually drops below the threshold; until then the alarm stays active.
The same on every family
Every manual that describes A30066 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Overtemperature of the electronic components (6) | Power Module | SINAMICS S120, S150 List Manual · p. 2962 |
The drives this code lives on
A30066 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A30066 mean on a SINAMICS S120 or S150?
The Power Module reports that the air discharged from the DC link capacitor has exceeded the alarm threshold, i.e. the capacitor cooling air is too warm. The temperature at which the threshold was reached is stored in r2124.
How do I clear alarm A30066?
No acknowledgement is required. The alarm only withdraws itself once the temperature has fallen below the alarm threshold, including the corresponding hysteresis.
What causes A30066?
An ambient temperature that is too high, or insufficient cooling such as a fan failure. Check whether the fan is running, check the fan elements, and check that the ambient temperature is in the permissible range.
What happens if alarm A30066 stays?
If operation is unchanged, the permissible limit value can be exceeded; the drive then outputs fault F30067 and inhibits the pulses.
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 A30xxx group · SINAMICS manuals · Siemens manuals