Siemens CU240S Error F00090: Encoder feedback loss

Siemens CU240S · taken from the manufacturer’s manual, pages cited

Fault codeF00090

Encoder feedback loss indicates the encoder signal has been lost, either due to a complete signal failure or sudden speed change exceeding set limits. The manual lists no action for this code.

Model
Siemens CU240S
Display shows
Encoder feedback loss (F00090)
Type
Fault code
Source
Manual p. 388

What F00090 means

Encoder feedback loss p. 388

Common causes

  • Signal from Encoder lost (check fault value r0949): p. 388
  • r0949 = 0: Encoder signal lost. p. 388
  • r0949 = 1: Encoder loss detected due to sudden speed change (i.e. speed change detected on encoder in a single scan > value in p0492). p. 388
  • r0949 = 2: Encoder signal lost whilst running at low speed. p. 388
  • r0949 = 5: Encoder not configured in p0400, but required for sensorless control (p1300 = 21 or 23). p. 388
  • r0949 = 6: Encoder not found, but configured in p0400. p. 388
  • r0949 = 7: Encoder loss detected due to motor stalled . p. 388

If F00090 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Siemens service.

Open the manual at page 388 All CU240S error codes Manual details & download

This page summarises what the manufacturer’s manual says about F00090; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.