What it means
A37999 appears when the HF Damping Module sends the Control Unit an alarm that the Control Unit firmware cannot interpret. The manual attributes this to a firmware mismatch: it occurs if the firmware on this component is more recent than the firmware on the Control Unit. The message itself only says "New message: %1"; which alarm the module has actually raised is stored as a number in r2124. Depending on how the drive is configured, the same condition can also be issued as a fault (F) or as a message without a reaction (N) instead of an alarm.
Why it appears
- The HF Damping Module has issued an alarm that the Control Unit firmware cannot interpret.
- This occurs when the firmware on the HF Damping Module is more recent than the firmware on the Control Unit.
What to check
- Read the alarm number of the unknown message in r2124 and interpret it as a decimal value.
- If required, read about the significance of this new alarm in a more recent description of the Control Unit.
- Replace the firmware on the HF Damping Module by an older firmware version (r0168).
- Alternatively, upgrade the firmware on the Control Unit (r0018 shows the installed Control Unit firmware version).
Reading the message value
- Alarm value (r2124, interpret decimal): alarm number — the number of the new alarm that the HF Damping Module has reported and the Control Unit firmware does not know.
Parameters the manual names
- r2124 — alarm value: for this message it holds the number of the unknown HF Damping Module alarm and must be read as a decimal figure.
- r0018 — Control Unit firmware version: shows which firmware level the Control Unit is on before you upgrade it.
Acknowledging and restarting
As an alarm, A37999 does not have to be acknowledged and does not interrupt operation; it goes away once the firmware mismatch is removed — an older firmware version on the HF Damping Module or an upgraded Control Unit. If the drive outputs the same condition as a fault instead, it must be acknowledged immediately (POWER ON).
The same on every family
Every manual that describes A37999 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. 3278 |
The drives this code lives on
A37999 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A37999 on a SINAMICS mean?
The HF Damping Module has issued an alarm that the Control Unit firmware cannot interpret. This happens when the firmware on the HF Damping Module is more recent than the firmware on the Control Unit.
How do I find out which alarm the HF Damping Module raised?
The number of the new alarm is stored in r2124 and must be interpreted as a decimal value. If required, the significance of this new alarm can be read in a more recent description of the Control Unit.
How do I fix alarm A37999?
Remove the firmware mismatch: either replace the firmware on the HF Damping Module by an older version (r0168) or upgrade the firmware on the Control Unit (r0018).
Does A37999 stop the drive or need an acknowledgement?
As an alarm it requires no acknowledgement and does not interrupt operation. If the drive is configured to output the condition as a fault, it must be acknowledged immediately (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 A37xxx group · SINAMICS manuals · Siemens manuals