What it means
A35927 is raised when the evaluation of a temperature sensor on channel 7 of a Terminal Module (TM) produces an error: the measured resistance lies outside the range the drive expects for the connected sensor type. The drive stores the case it detected as an alarm value in r2124, which tells you whether the sensor signal was interrupted or too low. Depending on how the drive is configured, the same condition can also be output as a fault or without any reaction.
Why it appears
- An error occurred while the drive was evaluating the temperature sensor connected to channel 7 of the Terminal Module.
- Alarm value 1: wire breakage, or the sensor is not connected — the measured resistance was above the upper threshold for the sensor type (KTY84, PT100 or PT1000).
- Alarm value 2: the measured resistance was too low for the connected sensor type (PTC thermistor, KTY84, PT100 or PT1000).
What to check
- Read the alarm value of the message in r2124 as a decimal number: 1 means wire breakage or the sensor is not connected, 2 means the measured resistance is too low.
- Make sure that the sensor is connected correctly.
- Replace the sensor.
Reading the message value
The drive stores the alarm value belonging to this message in r2124; 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 of this message; read it as a decimal number to see whether the drive detected a wire breakage or a missing sensor (1) or a resistance that is too low (2).
Acknowledging and restarting
As an alarm, A35927 does not stop the drive and does not have to be acknowledged. If the drive's configuration outputs the same condition as a fault, that fault is acknowledged immediately by switching the drive power on again (POWER ON).
What differs between the drive families
Straight from the manuals' own fields — A35927 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | External measured value / signal state outside the permissible range (16) | Terminal Module (TM) | SINAMICS S120, S150 List Manual · p. 3246 |
| G130, G150 | NONE | NONE | External measured value / signal state outside the permissible range (16) | Terminal Module (TM) | SINAMICS G130, G150 List Manual · p. 1908 |
The drives this code lives on
A35927 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 SINAMICS alarm A35927 mean?
The Terminal Module has detected an error while evaluating the temperature sensor on channel 7: either a wire breakage or a sensor that is not connected (alarm value 1), or a measured resistance that is too low (alarm value 2).
How do I fix A35927?
Make sure that the sensor is connected correctly, and replace the sensor if the message stays. The alarm value in r2124 tells you which of the two cases the drive detected.
Which sensor resistances trigger A35927?
For alarm value 1 the resistance was above 2170 Ohm (KTY84), 194 Ohm (PT100) or 1944 Ohm (PT1000); for alarm value 2 it was below 20 Ohm (PTC thermistor), 180 Ohm (KTY84), 60 Ohm (PT100) or 603 Ohm (PT1000).
Does A35927 have to be acknowledged?
As an alarm, no. If the drive's configuration outputs the same condition as a fault, that fault is acknowledged immediately by switching the drive power on again (POWER ON).
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