What it means
A30054 is reported by the Power Module: while the brake is being opened, the power unit detects that the power supply voltage is less than 21.4 V. Depending on how the drive is configured, the same condition can also be issued as a fault or with no reaction instead of this alarm.
Why it appears
- While the brake is being opened, the power supply voltage is detected as less than 21.4 V.
What to check
- Check the 24 V voltage for stability and value.
- Read the alarm value in r2124 to see the voltage that was present at the moment the brake was opened (how to interpret it is described below).
Reading the message value
- The drive stores the alarm value in r2124; interpret it as a decimal number. The value is the supply voltage fault in 0.1 V.
- Example: alarm value = 195 → voltage = 19.5 V.
Parameters the manual names
- r2124 — alarm value: shows the supply voltage the power unit measured when the brake was opened; read it as a decimal in 0.1 V steps, e.g. 195 = 19.5 V.
Acknowledging and restarting
As an alarm, A30054 needs no acknowledgement. If the drive's configuration raises the same condition as a fault instead, that fault must be acknowledged immediately.
What differs between the drive families
Straight from the manuals' own fields — A30054 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | NONE | NONE | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS G130, G150 List Manual · p. 1668 |
| S120, S150 | NONE | NONE | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS S120, S150 List Manual · p. 2959 |
| G120 | NONE | NONE | Supply voltage fault (undervoltage) (3) | — | SINAMICS G120 · p. 915 |
The drives this code lives on
A30054 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 SINAMICS alarm A30054 mean?
The power unit detected while the brake was being opened that the power supply voltage is less than 21.4 V. The message comes from the Power Module.
How do I fix A30054?
Check the 24 V voltage for stability and value. The alarm value in r2124 tells you the voltage present at that moment, in 0.1 V steps.
Does A30054 have to be acknowledged?
No — as an alarm it requires no acknowledgement. If the drive is configured to issue the same condition as a fault, that fault must be acknowledged immediately.
What does alarm value 195 mean for A30054?
The alarm value in r2124 is interpreted as a decimal number with 0.1 V resolution, so a value of 195 corresponds to a supply voltage of 19.5 V.
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