What it means
F30087 means the power unit has detected that its coolant temperature exceeded the specified fault threshold. The drive reacts by switching off (OFF2), i.e. it coasts down, and the fault has to be acknowledged immediately before the drive will start again. The fault value stored in r0949 gives the coolant temperature at which the drive tripped, read as a decimal number. Neighbouring power-unit faults — for example F30083 (cooling medium flow rate too low) or F30078 (defective fan or line reactor has overheated) — are separate codes with their own pages.
Why it appears
- The coolant temperature of the power unit has exceeded the specified fault threshold.
What to check
- Check the cooling system.
- Check the ambient conditions.
Reading the message value
- The drive stores the fault value in r0949.
- Interpret r0949 as a decimal number: the value it contains is the coolant temperature at which the fault was raised.
Parameters the manual names
- r0949 — fault value of the last event; for F30087 read it as a decimal number to see the coolant temperature that exceeded the threshold.
Acknowledging and restarting
This fault must be acknowledged immediately. Because the drive trips with OFF2, it coasts down and will only start again once the fault has been acknowledged. Before returning the drive to service, check the cooling system and the ambient conditions so that the coolant temperature stays below the fault threshold.
The same on every family
Every manual that describes F30087 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Power electronics faulted (5) | Power Module | SINAMICS S120, S150 List Manual · p. 2969 |
The drives this code lives on
F30087 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F30087 mean in SINAMICS?
The power unit reports that its coolant temperature has exceeded the specified fault threshold. The drive switches off (OFF2) and the fault must be acknowledged immediately.
How can I see the coolant temperature that triggered F30087?
The fault value is stored in r0949. Interpret the value as a decimal number — it is the coolant temperature at which the drive tripped.
How do I reset F30087?
Acknowledge the fault immediately; the drive coasts down with OFF2 and restarts only after acknowledgement. Check the cooling system and the ambient conditions beforehand.
What causes F30087?
The manual gives a single cause: the coolant temperature exceeded the specified fault threshold. It recommends checking the cooling system and the ambient conditions.
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 F30xxx group · SINAMICS manuals · Siemens manuals