What it means
A30041 is reported by the Power Module: the power supply of the power unit has dropped below its lower threshold. On SERVO, SERVO_AC and SERVO_I_AC drive objects the alarm covers both the 24 V and the 48 V power supply; the other drive objects report the 24 V supply. The drive configuration decides whether the message stays an alarm or is also raised as a fault — as a fault it is acknowledged IMMEDIATELY, and a POWER ON (switch-off/switch-on) is then enough to restart.
Why it appears
- The power supply of the power unit has dropped below its lower threshold. On SERVO drive objects either the 24 V or the 48 V supply can be affected; the other drive objects report the 24 V supply.
What to check
- Check the power supply of the power unit.
- Carry out a POWER ON for the component — switch the Power Module off and on again.
Reading the message value
- The drive stores the alarm value in r2124; the message value carries it as well — on SERVO drive objects it is output as channel and voltage.
- SERVO, SERVO_AC, SERVO_I_AC: interpret r2124 hexadecimal as yyxxxx hex, where yy is the channel (0 = 24 V power supply, 1 = 48 V power supply) and xxxx the voltage in 0.1 V.
- VECTOR, VECTOR_AC, VECTOR_I_AC and VECTOR_G: interpret r2124 decimal as the 24 V voltage in 0.1 V.
- A_INF, B_INF, R_INF, S_INF: the alarm value is only for internal Siemens troubleshooting.
Parameters the manual names
- r2124 — alarm value: read it to determine which supply channel dropped out and the voltage that was present, interpreted per the drive object as listed above.
Acknowledging and restarting
While A30041 appears as an alarm, no acknowledgement is required. If the drive is configured to raise the same condition as a fault, the fault is acknowledged IMMEDIATELY — a POWER ON (switch-off/switch-on) of the component is sufficient.
What differs between the drive families
Straight from the manuals' own fields — A30041 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS S120, S150 List Manual · p. 2953 |
| S120, S150 | NONE | NONE | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS S120, S150 List Manual · p. 2953 |
| S120, S150 | NONE | NONE | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS S120, S150 List Manual · p. 2954 |
| G130, G150 | NONE | NONE | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS G130, G150 List Manual · p. 1663 |
| G130, G150 | NONE | NONE | Supply voltage fault (undervoltage) (3) | Power Module | SINAMICS G130, G150 List Manual · p. 1664 |
The drives this code lives on
A30041 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 A30041 in SINAMICS mean?
The power supply of the power unit has dropped below its lower threshold — the 24 V supply, or on SERVO drive objects also the 48 V supply. The measured value is stored in r2124.
How do I clear A30041?
Check the power supply of the power unit and then carry out a POWER ON (switch-off/switch-on) of the component. The manual lists no other measures.
Does A30041 have to be acknowledged?
No — as an alarm it needs no acknowledgement. If the same condition is configured as a fault, it is acknowledged IMMEDIATELY with a POWER ON.
How do I read the alarm value of A30041?
In r2124. On SERVO drive objects interpret it hexadecimal as yyxxxx: yy is the channel (0 = 24 V, 1 = 48 V) and xxxx the voltage in 0.1 V; on VECTOR drive objects interpret it decimal as the 24 V voltage in 0.1 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