Siemens CU240B/E-2 Error F07985: Drive: Speed controller optimization (oscillation test)

Control unit · taken from the manufacturer’s manual, pages cited

Fault codeF07985

A fault occurred during the vibration test for speed controller optimization. The manual's first action is: “- check the motor parameters (rating plate data). After the change: Calculate p0340 = 3.”

Model
Siemens CU240B/E-2
Display shows
Drive: Speed controller optimization (oscillation test) (F07985)
Type
Fault code
Source
Manual p. 706

What F07985 means

Drive: Speed controller optimization (oscillation test) p. 706

Common causes

  • A fault has occurred during the vibration test. p. 706
  • Fault value (r0949, decimal interpretation): p. 706
  • 1: The speed did not reach a steady-state condition. p. 706
  • 2: The speed setpoint was not able to be approached as the minimum limiting is active. p. 706
  • 3: The speed setpoint was not able to be approached as the suppression (skip) bandwidth is active. p. 706
  • 4: The speed setpoint was not able to be approached as the maximum limiting is active. p. 706
  • 5: Torque limits too low for a torque step. p. 706
  • 6: No suitable speed controller setting was found. p. 706
  • For fault value = 1: p. 706
  • For fault value = 2: p. 706
  • For fault value = 3: p. 706
  • For fault value = 4: p. 706
  • For fault value = 5: p. 706
  • For fault value = 6: p. 706
  • See also: p1959 (Rotating measurement configuration) p. 706

What to do

  1. - check the motor parameters (rating plate data). After the change: Calculate p0340 = 3. p. 706
  2. - check the moment of inertia (p0341, p0342). After the change: Calculate p0340 = 3. p. 706
  3. - carry out a motor data identification routine (p1910). p. 706
  4. - if required, reduce the dynamic factor (p1967 < 25 %). p. 706
  5. - adapt the speed setpoint (p1965) or adapt the minimum limit (p1080). p. 706
  6. - adapt the speed setpoint (p1965) or suppression (skip) bandwidths (p1091 ... p1094, p1101). p. 706
  7. - adapt the speed setpoint (p1965) or maximum limit (p1082, p1083 and p1086). p. 706
  8. - increase the torque limits (e.g. p1520, p1521). p. 706
  9. - reduce the dynamic factor (p1967). p. 706
  10. - disable the vibration test (p1959.4 = 0) and repeat the rotating measurement. p. 706

If F07985 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 706 All CU240B/E-2 error codes Manual details & download

This page summarises what the manufacturer’s manual says about F07985; 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.