What it means
A35928 comes from a Terminal Module (TM): while evaluating the temperature sensor connected to its channel 8, the drive found an error. The alarm value that the drive stores in r2124 — read as a decimal number — tells which of two conditions it saw: an interrupted sensor circuit or a resistance that is too low. Depending on how the drive is configured, the same condition can also be output as a fault (F) or as a message without any reaction (N).
Why it appears
- An error occurred while the drive was evaluating the temperature sensor on channel 8 of the Terminal Module.
- Alarm value 1: wire breakage, or the sensor is not connected.
- Alarm value 2: the measured resistance of the sensor is too low.
What to check
- Read the alarm value in r2124 as a decimal number to determine what the drive detected: 1 = wire breakage or sensor not connected, 2 = measured resistance too low.
- Make sure that the sensor is connected correctly.
- Replace the sensor.
Reading the message value
The message value carries the alarm value; the drive also stores it in r2124, and the manual says to interpret it as a decimal number.
- 1 — wire breakage or sensor not connected: KTY84: R > 2170 Ohm, PT100: R > 194 Ohm, PT1000: R > 1944 Ohm.
- 2 — measured resistance too low: PTC thermistor: R < 20 Ohm, KTY84: R < 180 Ohm, PT100: R < 60 Ohm, PT1000: R < 603 Ohm.
Parameters the manual names
- r2124 — alarm value: read it as a decimal number to tell whether the drive detected a wire breakage or an unconnected sensor (1) or a resistance that is too low (2).
Acknowledging and restarting
As an alarm, A35928 requires no acknowledgement. If the drive is configured to raise the same condition as a fault instead, that fault is acknowledged immediately; switching the power supply off and on (POWER ON) also acknowledges it.
The same on every family
Every manual that describes A35928 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | External measured value / signal state outside the permissible range (16) | Terminal Module (TM) | SINAMICS S120, S150 List Manual · p. 3247 |
| G130, G150 | NONE | NONE | External measured value / signal state outside the permissible range (16) | Terminal Module (TM) | SINAMICS G130, G150 List Manual · p. 1909 |
The drives this code lives on
A35928 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A35928 mean on a SINAMICS drive?
A Terminal Module has detected an error while evaluating the temperature sensor on channel 8. The alarm value in r2124 distinguishes a wire breakage or an unconnected sensor (1) from a resistance that is too low (2).
How do I fix alarm A35928?
Make sure that the temperature sensor on channel 8 is connected correctly, and replace the sensor if the message remains. The alarm itself requires no acknowledgement; if the condition is configured as a fault, it is acknowledged immediately, and switching the power supply off and on (POWER ON) also acknowledges it.
Which resistance limits belong to A35928?
For alarm value 1 (wire breakage or sensor not connected): KTY84 above 2170 Ohm, PT100 above 194 Ohm, PT1000 above 1944 Ohm. For alarm value 2 (resistance too low): PTC thermistor below 20 Ohm, KTY84 below 180 Ohm, PT100 below 60 Ohm, PT1000 below 603 Ohm.
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 A35xxx group · SINAMICS manuals · Siemens manuals