What it means
A49939 signals that the battery of the uninterruptible power supply (UPS) is discharged. The Control Unit generates the message through the signal source of binector input p6577[27]. The drive configuration decides whether the condition appears as this alarm or also as a fault (F); what happens then is described under "Reset and restart" below.
Why it appears
- The battery of the uninterruptible power supply (UPS) is discharged.
What to check
- Check the UPS battery.
Parameters the manual names
- p6577 (BI: Circuit monitoring functions signal source) — A49939 is output via index [27] of this binector input of the Control Unit.
Acknowledging and restarting
As an alarm the message is informational: the drive takes no automatic action and nothing needs to be acknowledged — the task is to check the UPS battery. If the configuration raises the same condition as a fault instead, the infeed and the SERVO, VECTOR and HLA drive objects perform OFF1 by default (a different stop response such as NONE, OFF2 or OFF3 can be selected, depending on the drive object), and the fault must then be acknowledged immediately.
The same on every family
Every manual that describes A49939 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | General drive fault (19) | None | SINAMICS S120, S150 List Manual · p. 3297 |
The drives this code lives on
A49939 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does A49939 UPS battery discharged mean on SINAMICS?
The alarm reports that the uninterruptible power supply (UPS) battery is discharged. It is generated by the Control Unit via binector input p6577[27].
Does A49939 shut down the drive?
Not as an alarm — the drive takes no automatic action. If the condition is configured as a fault, the infeed and the SERVO, VECTOR and HLA drive objects perform OFF1 by default.
How is A49939 reset or acknowledged?
As an alarm it needs no acknowledgement; you simply check the UPS battery. Only when the condition is raised as a fault must it be acknowledged immediately.
Which parameter is linked to A49939?
p6577 (BI: Circuit monitoring functions signal source): the message is output via index [27] of this binector input of the Control Unit.
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