What it means
F31887 reports a component fault on the DRIVE-CLiQ connection of encoder 1: the drive has detected a fault on the DRIVE-CLiQ component involved, the Sensor Module for encoder 1, and faulty hardware cannot be excluded. The message value tells you which component is affected and what the fault cause was. Depending on the drive configuration, the same condition can also be output as an alarm or without any reaction.
Why it appears
- A fault was detected on the DRIVE-CLiQ component involved — the Sensor Module for encoder 1.
- Faulty hardware cannot be excluded.
What to check
- Check the DRIVE-CLiQ wiring for an interrupted cable or poor contacts.
- Check the electrical cabinet design and the cable routing for EMC compliance.
- If required, use another DRIVE-CLiQ socket (p9904).
- Replace the component involved.
Reading the message value
- The drive codes the information as 0000yyxx hex in the message value: yy = component number, xx = fault cause. Read the value as fault value in r0949, or as alarm value in r2124 when the condition is output as an alarm.
- 32 (= 20 hex): Error in the telegram header.
- 35 (= 23 hex): Receive error: the telegram buffer memory contains an error.
- 66 (= 42 hex): Send error: the telegram buffer memory contains an error.
- 67 (= 43 hex): Send error: the telegram buffer memory contains an error.
- 96 (= 60 hex): Response received too late during runtime measurement.
- 97 (= 61 hex): Time taken to exchange characteristic data too long.
Parameters the manual names
- r0949 (fault value) — read the component number and fault cause of this fault here.
- r2124 (alarm value) — holds the same coding when the condition is output as an alarm.
- p9904 (Topo_compare ackn, topology comparison acknowledge differences) — named by the remedy when the Sensor Module is to be operated via another DRIVE-CLiQ socket.
Acknowledging and restarting
Remove the cause first, then acknowledge the fault immediately — no special reset procedure is described. When the drive is configured to output this condition as an alarm or without any reaction, no acknowledgement is required.
What differs between the drive families
Straight from the manuals' own fields — F31887 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | Infeed: NONE (OFF1, OFF2) Servo: ENCODER (IASC/DCBRK, NONE) Vector: ENCODER (IASC/DCBRK, NONE) Hla: ENCODER (NONE) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Sensor Module Encoder 1 | SINAMICS S120, S150 List Manual · p. 3073 |
| G130, G150 | Vector: ENCODER (IASC/DCBRK, NONE) Infeed: NONE (OFF1, OFF2) | IMMEDIATELY | Internal (DRIVE-CLiQ) communication error (12) | Sensor Module Encoder 1 | SINAMICS G130, G150 List Manual · p. 1756 |
The drives this code lives on
F31887 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 fault F31887 mean?
It reports a component fault on the DRIVE-CLiQ component for encoder 1, the Sensor Module Encoder 1; the manuals note that faulty hardware cannot be excluded.
How do I fix fault F31887?
Check the DRIVE-CLiQ wiring and the EMC-compliant cabinet design and cable routing, if required use another DRIVE-CLiQ socket (p9904), and replace the component involved. Then acknowledge the fault immediately.
Where do I read the fault cause of F31887?
In the message value: r0949 as fault value or r2124 as alarm value, coded 0000yyxx hex — yy is the component number, xx the fault cause, e.g. 32 (= 20 hex) for an error in the telegram header.
Does F31887 always require an acknowledgement?
No — depending on the drive configuration, the same condition can also be output as an alarm or without any reaction, in which case no acknowledgement is required.
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 F31xxx group · SINAMICS manuals · Siemens manuals