What it means
A37312 is an alarm from the HF Choke Module (reactor module) of an S120 or S150 drive: the module signals an overtemperature or a fan failure. The manuals list the condition both as an alarm and as a fault — if the alarm is present for longer than 30 s, the drive outputs fault F37313. While it is only an alarm, the drive does not shut down by itself; the escalation to the fault side is what changes the drive's behaviour.
Why it appears
- The HF Choke Module signals an overtemperature or a fan failure.
- The cable between the HF Choke Module and the HF Damping Module has been withdrawn or is defective (X21).
- The fan of the HF Choke Module is defective.
- The ambient temperature is outside the permissible range.
What to check
- Check the cable between the HF Choke Module and the HF Damping Module at X21 — the manual names it as withdrawn or defective.
- Check the fan of the HF Choke Module and replace it if necessary.
- Check whether the ambient temperature is in the permissible range.
Acknowledging and restarting
Alarm A37312 needs no acknowledgement — it clears itself once the overtemperature or fan problem has been removed. If the alarm has been present for longer than 30 s, the drive outputs fault F37313; the manual then notes Reaction upon F: NONE (OFF1, OFF2, OFF3)
and Acknowl. upon F: IMMEDIATELY (POWER ON)
. In practice: remove the cause first, then acknowledge fault F37313 immediately (POWER ON) before restarting the drive.
The same on every family
Every manual that describes A37312 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Power electronics faulted (5) | None | SINAMICS S120, S150 List Manual · p. 3267 |
The drives this code lives on
A37312 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A37312 mean on a SINAMICS S120 or S150?
The HF Choke Module (reactor module) signals an overtemperature or a fan failure. If the alarm is present for longer than 30 s, the drive outputs fault F37313.
How do I fix alarm A37312?
Check the cable between the HF Choke Module and the HF Damping Module at X21, check the fan of the HF Choke Module and replace it if necessary, and check whether the ambient temperature is in the permissible range.
Does A37312 stop the drive?
No — as an alarm it needs no acknowledgement and the drive does not shut down by itself. Only the escalation to fault F37313 after 30 s brings the fault reaction into play.
What is the difference between A37312 and F37313?
A37312 is the alarm form of the same condition; F37313 is output when the alarm has been present for longer than 30 s. The fault is 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