What it means
A37034 is an alarm from the HF Damping Module in SINAMICS S120 and S150 drives: the alarm threshold for internal overtemperature has been reached inside the unit. It is the warning stage before the trip level — If the temperature inside the unit continues to increase, fault F37036 may be triggered.
The alarm therefore points at the cooling of the unit, and the checks below address exactly that.
Why it appears
- The ambient temperature might be too high.
- Insufficient cooling, fan failure.
What to check
- Check the ambient temperature.
- Check the fan for the inside of the unit.
Reading the message value
The drive stores the alarm's value in r0949; interpret it in binary. The set bit shows which range inside the HF Damping Module reported the overtemperature:
- Bit 0 = 1: Control electronics range.
- Bit 1 = 1: Power electronics range.
Parameters the manual names
- r0949 — fault value: read this parameter and interpret it bit by bit to see whether the overtemperature alarm came from the control electronics range (bit 0) or the power electronics range (bit 1) of the HF Damping Module.
Acknowledging and restarting
No acknowledgement is required for this alarm — there is nothing to reset at the operator panel. Restore the cooling instead: check the ambient temperature and the fan for the inside of the unit. Keep in mind that the alarm is the preliminary stage; if the temperature inside the unit continues to increase, fault F37036 may be triggered.
The same on every family
Every manual that describes A37034 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. 3263 |
The drives this code lives on
A37034 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A37034 mean on a SINAMICS S120 or S150?
It is an alarm from the HF Damping Module: the alarm threshold for internal overtemperature has been reached inside the unit. If the temperature continues to increase, fault F37036 may be triggered.
How do I acknowledge or reset alarm A37034?
No acknowledgement is required. Instead, restore cooling — check the ambient temperature and the fan for the inside of the unit — before the condition escalates to fault F37036.
What causes alarm A37034?
The manual names an ambient temperature that might be too high, and insufficient cooling with fan failure, as possible causes.
What is the fault value of A37034?
The drive stores it in r0949, interpreted in binary: bit 0 = 1 means the control electronics range, bit 1 = 1 means the power electronics range.
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