What it means
A37056 is raised when the temperature of the HF Damping Module heat sink exceeds the permissible limit value. Depending on the drive's configuration, the drive can also output the same condition as a fault. For the fault case the manual notes: HF Damping Module Reaction upon F: NONE (OFF1, OFF2, OFF3)
— the drive therefore does not shut down with OFF1, OFF2 or OFF3 because of this message. The heat sink temperature that triggered the message is available as the alarm value in r2124 (see below).
Why it appears
- Cooling is insufficient or a fan has failed.
- The HF Damping Module is overloaded.
- The ambient temperature is too high.
What to check
- Check whether the fan is running.
- Check the fan elements.
- Check whether the ambient temperature is within the permissible range.
Reading the message value
- The drive enters the heat sink temperature as the message value; it is the alarm value stored in r2124.
- Interpret r2124 as a decimal number: the reading is the temperature in units of 0.01 °C.
Parameters the manual names
- r2124 (alarm value): for this message it holds the HF Damping Module heat sink temperature that triggered A37056 — read it as a decimal number in units of 0.01 °C to see how hot the heat sink currently is.
Acknowledging and restarting
An acknowledgement is only accepted once the heat sink has cooled down again. The manual states: This fault can only be acknowledged after the alarm threshold for alarm A05000 has been undershot.
After checking the fan and the ambient temperature, wait until the temperature has fallen back below the alarm threshold of A05000, then acknowledge the message.
The same on every family
Every manual that describes A37056 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. 3266 |
The drives this code lives on
A37056 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A37056 mean on a SINAMICS?
It reports that the heat sink of the HF Damping Module has exceeded its permissible temperature limit value. The measured temperature is stored as the alarm value in r2124, in units of 0.01 °C.
Why does the drive raise A37056?
The manual names insufficient cooling or fan failure, an overload, and an ambient temperature that is too high as causes for the excessive heat sink temperature.
How do I clear A37056?
Check whether the fan is running, check the fan elements and the ambient temperature, and let the heat sink cool down. The message can only be acknowledged after the alarm threshold of A05000 has been undershot.
Can A37056 also appear as a fault?
Yes — depending on the drive's configuration, the same overtemperature condition can also be output as a fault. The manual notes for the HF Damping Module that no OFF1, OFF2 or OFF3 reaction is triggered.
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