What it means
F06922 reports that a phase failure of the brake resistor was detected. The manuals describe the fault identically for the G120, G130/G150 and S120/S150 converters: the brake resistor is operated through the braking chopper, and the affected phase is stored as a decimal fault value in r0949 — 11 for phase U, 12 for phase V and 13 for phase W. The failed phase can therefore be read directly from the fault value.
Why it appears
- A phase failure was detected on the brake resistor.
- The phase failure signal is evaluated using the monitoring time in p3235 (phase failure signal motor monitoring time), which the manual references for this fault.
What to check
Check the feeder cables to the braking resistors.
- For the G130/G150 and S120/S150 entries the remedy additionally references the braking chopper parameters p1360 (Braking chopper braking resistor cold), p1362 (Braking chopper activation threshold), r1363 (Braking chopper output voltage) and p1364 (Braking chopper resistor asymmetry).
Reading the message value
- The fault value is stored in r0949 and must be interpreted as a decimal number.
- 11 — Phase U
- 12 — Phase V
- 13 — Phase W
Parameters the manual names
- r0949 — fault value: read the stored value as a decimal number to identify the affected phase of the brake resistor (11 = U, 12 = V, 13 = W).
- p3235 — phase failure signal motor monitoring time: the monitoring time referenced in the cause of this fault.
- p1360 — braking chopper braking resistor cold: referenced by the remedy when checking the brake resistor.
- p1362 — braking chopper activation threshold: referenced by the remedy when checking the braking chopper.
- r1363 — CO: braking chopper output voltage: referenced by the remedy when checking the braking chopper.
- p1364 — braking chopper resistor asymmetry: referenced by the remedy when checking the brake resistor.
Acknowledging and restarting
Acknowledge the fault immediately. F06922 is raised without a protective reaction, so the drive does not trip when the phase failure is detected; the fault still has to be acknowledged before the message is cleared. The remedy is to check the feeder cables to the braking resistors first.
What differs between the drive families
Straight from the manuals' own fields — F06922 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | IMMEDIATELY | Braking Module faulted (14) | Motor | SINAMICS S120, S150 List Manual · p. 2776 |
| G130, G150 | NONE | IMMEDIATELY | Braking Module faulted (14) | Motor | SINAMICS G130, G150 List Manual · p. 1533 |
| G120 | — | — | Braking Module faulted (14) | — | SINAMICS G120 · p. 869 |
The drives this code lives on
F06922 is described for G120, G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F06922 mean on a SINAMICS drive?
F06922 'Braking resistor phase failure' means the drive has detected a phase failure of the brake resistor. The affected phase is stored as a decimal fault value in r0949: 11 = phase U, 12 = phase V, 13 = phase W.
How do I fix F06922?
Check the feeder cables to the braking resistors, then acknowledge the fault — immediate acknowledgment is required. For G130/G150 and S120/S150 the remedy also references the braking chopper parameters p1360, p1362, r1363 and p1364.
Does F06922 trip the drive?
No. The fault is raised without a protective reaction, but it must be acknowledged immediately.
Which phase of the brake resistor has failed?
Read the fault value in r0949 as a decimal number: 11 means phase U, 12 means phase V and 13 means phase W.
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 F06xxx group · SINAMICS manuals · Siemens manuals