What it means
The drive raises this alarm when one of the message buffers of its CAN interface overflows, so that CAN messages can no longer be taken up in time. The alarm value tells you which of the three buffers is affected: the non-cyclic send buffer (SDO response buffer), the non-cyclic receive buffer (SDO receive buffer) or the cyclic send buffer (PDO send buffer). The drive itself does not trip as a result of this alarm.
Why it appears
- The non-cyclic send buffer (SDO response buffer) has overflowed (alarm value 1).
- The non-cyclic receive buffer (SDO receive buffer) has overflowed (alarm value 2).
- The cyclic send buffer (PDO send buffer) has overflowed (alarm value 3).
What to check
- Check the bus cable.
- Set a higher baud rate in p8622 (CAN bit rate).
- Check the bit timing and, if required, optimize it in p8623.
- For alarm value 2: reduce the cycle times of the SDO receive messages.
- For alarm value 2: have the master send an SDO request only after the SDO feedback for the previous SDO request has been received.
Reading the message value
- The drive stores the alarm value in r2124; interpret it as a decimal number.
- 1: Non-cyclic send buffer (SDO response buffer) overflow.
- 2: Non-cyclic receive buffer (SDO receive buffer) overflow.
- 3: Cyclic send buffer (PDO send buffer) overflow.
Parameters the manual names
- p8622 — set a higher baud rate here (CAN bit rate) to take load off the CAN interface.
- p8623 — check the CAN bit timing selection here and optimize it if the alarm persists.
- r2124 — read the alarm value here (decimal) to identify which of the three buffers has overflowed.
Acknowledging and restarting
No acknowledgment is required for this alarm; it disappears once the affected buffer no longer overflows. If it keeps coming back, work through the checks above.
What differs between the drive families
Straight from the manuals' own fields — A08753 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2927 |
| G130, G150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1641 |
| G120 | NONE | NONE | Communication error to the higher-level control system (9) | — | SINAMICS G120 · p. 901 |
The drives this code lives on
A08753 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 A08753 mean on a SINAMICS drive?
A message buffer of the CAN interface has overflowed. The alarm value in r2124 tells you which buffer: 1 is the SDO response buffer, 2 the SDO receive buffer and 3 the PDO send buffer.
How do I fix alarm A08753?
Check the bus cable, then set a higher baud rate in p8622 and check and, if required, optimize the bit timing in p8623. If the alarm value is 2, also reduce the cycle times of the SDO receive messages and only send a new SDO request after the feedback for the previous one.
Does A08753 have to be acknowledged?
No. The alarm requires no acknowledgment and the drive does not trip; it goes away when the buffer overflow stops.
Which drives can issue A08753?
The manuals describe this alarm for the G120, G130, G150, S120 and S150.
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 A08xxx group · SINAMICS manuals · Siemens manuals