What it means
A30999 — the manuals title it Power unit: Unknown alarm
— is output when the power unit issues an alarm that the firmware on the Control Unit does not know and therefore cannot interpret. The manual states that this can occur if the firmware on the power unit is more recent than the firmware on the Control Unit. Depending on how the drive is configured, the same condition can also be output as a fault (F) or as a message without any reaction (N).
Why it appears
- An alarm occurred on the power unit that the firmware on the Control Unit cannot interpret.
- The firmware on the power unit is more recent than the firmware on the Control Unit.
What to check
- Read the alarm value in r2124 as a decimal number — it contains the alarm number of the alarm the power unit issued.
- If required, read about the significance of this new alarm in a more recent description of the Control Unit.
- Compare the firmware versions: r0128 shows the firmware version of the power unit, r0018 the firmware version of the Control Unit.
- Either replace the firmware on the power unit by an older firmware version (r0128 shows which version is installed), or upgrade the firmware on the Control Unit (r0018 shows which version is installed).
Reading the message value
- The message value reports the new message: the drive outputs
New message: %1
— the alarm that the power unit has issued and that the Control Unit firmware cannot interpret. - Alarm value (r2124, interpret decimal): Alarm number — the drive writes the number of the new alarm into r2124, and the value must be interpreted as a decimal number.
Parameters the manual names
- r2124 — alarm value: read the alarm number of the unknown power-unit alarm here; the manual says to interpret the value as decimal.
- r0128 — power unit firmware version (PU FW version): check here which firmware the power unit is running before replacing it with an older version.
- r0018 — Control Unit firmware version (CU FW version): check here which firmware the Control Unit is running before upgrading the Control Unit firmware.
Acknowledging and restarting
As an alarm, A30999 requires no acknowledgment and the drive takes no automatic action in response to it. If the drive is configured to output the same condition as a fault (F), that fault must be acknowledged immediately; in addition, the drive must be powered up again (POWER ON).
What differs between the drive families
Straight from the manuals' own fields — A30999 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Power electronics faulted (5) | Power Module | SINAMICS S120, S150 List Manual · p. 3025 |
| G130, G150 | NONE | NONE | Power electronics faulted (5) | Power Module | SINAMICS G130, G150 List Manual · p. 1715 |
| G120 | NONE | NONE | Power electronics faulted (5) | — | SINAMICS G120 · p. 933 |
The drives this code lives on
A30999 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A30999 mean on a SINAMICS drive?
The power unit has issued an alarm that the firmware on the Control Unit cannot interpret. The manual says this can occur if the firmware on the power unit is more recent than the firmware on the Control Unit.
How do I fix A30999?
Read the alarm number from r2124 (interpret it as a decimal number) and, if required, look up its significance in a more recent description of the Control Unit. Then either replace the power unit firmware with an older version (r0128) or upgrade the Control Unit firmware (r0018).
Does A30999 have to be acknowledged?
No — as an alarm it requires no acknowledgment and the drive takes no automatic action. If the condition is output as a fault (F), it must be acknowledged immediately and the drive must be powered up again (POWER ON).
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