What it means
F30078 is raised by the Power Module of a SINAMICS S120 or S150 converter when the temperature monitoring of the internal braking resistor or of the line reactor has responded. The drive executes an OFF2 response, and, in addition to that response, the use of the internal braking resistor is inhibited while the fault is present. No message value is supplied with this fault, so the fault itself carries no further diagnostic bits.
Why it appears
- The temperature monitoring of the internal braking resistor has responded. The manual notes that an overtemperature condition of the internal braking resistor can only be initiated by a defective fan.
- The temperature monitoring of the line reactor has responded. This can occur when a DC link coupling is used and the motoring power fed into the DC link is not evenly distributed across the rectifiers of the power units.
What to check
- Check the converter fan and replace it if necessary. This addresses the braking-resistor branch of the fault, since a defective fan is its only stated cause.
- Reduce the motoring power. This addresses the line-reactor branch, which arises from motoring power that is not evenly distributed across the rectifiers of the power units when a DC link coupling is used.
Acknowledging and restarting
Rectify the cause first, then acknowledge the fault and restart the drive. The drive provides immediate acknowledgement for this fault, so it can be acknowledged as soon as it appears. Keep in mind that, in addition to the OFF2 response, the use of the internal braking resistor was inhibited as part of this fault; the inhibition applies for as long as the fault is present.
The same on every family
Every manual that describes F30078 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | OFF2 | IMMEDIATELY | Overtemperature of the electronic components (6) | Power Module | SINAMICS S120, S150 List Manual · p. 2966 |
The drives this code lives on
F30078 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F30078 mean on a SINAMICS S120 or S150?
It reports that the temperature monitoring of the internal braking resistor or the line reactor in the Power Module has responded. The drive executes an OFF2 response and additionally inhibits the use of the internal braking resistor.
Can the internal braking resistor overheat for any reason other than a fan fault?
No. The manual states that an overtemperature condition of the internal braking resistor can only be initiated by a defective fan.
Why does the line reactor overheat and trigger F30078?
This can happen when a DC link coupling is used and the motoring power fed into the DC link is not evenly distributed across the rectifiers of the power units. The manual's remedy for this branch is to reduce the motoring power.
How do I clear and reset F30078?
Check the converter fan and replace it if necessary, reduce the motoring power, then acknowledge the fault and restart the drive. The drive allows immediate acknowledgement of this fault.
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