Which are you using (e.g., S7-1500, SINAMICS S120)?
Ensure shielded cables are properly grounded to drain interference. 2. Audit the Hardware Configuration Open your TIA Portal or SIMATIC Manager project. Navigate to the . Check the Isochronous Mode settings.
The inverters control commands (start/stop) and the setup commands (p1910) come from different sources. siemens fault 0a7991 best
The condition is a status notification rather than a hardware breakdown. It signifies that the drive is waiting to map the electrical characteristics of the connected motor to optimize control loops.
: You or another technician selected a standstill or rotating measurement via parameter p1900 or p1910 . Which are you using (e
This is the standard engineering practice to clear the notification while ensuring precise motor protection and torque efficiency. How can resolve the alarm Code 7991 and 8526 - SiePortal
If you see both:
Save configurations to ROM (), isolate the 400V/24V power, and reboot.
💡 If your PLC cycle time is too high, consider moving non-critical logic to a different cyclic interrupt (OB) to prioritize the motion control communication. When to Contact Siemens Support Audit the Hardware Configuration Open your TIA Portal
How can resolve the alarm Code 7991 and 8526 - SiePortal - Siemens
: If you are in the commissioning phase, give the drive a "Run" command. The drive will perform a motor identification (at a standstill or rotating, depending on settings), often making a whistling sound. Once finished, the alarm will automatically clear.