Siemens CU240B/E-2 Error F07984: Drive: Speed controller optimization, moment of inertia

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

Fault codeF07984

A fault occurred while identifying the moment of inertia during 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, moment of inertia (F07984)
Type
Fault code
Source
Manual p. 706

What F07984 means

Drive: Speed controller optimization, moment of inertia p. 706

Common causes

  • A fault has occurred while identifying the moment of inertia. 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: It is not possible to increase the speed by 10% as the minimum limiting is active. p. 706
  • 6: It is not possible to increase the speed by 10% as the suppression (skip) bandwidth is active. p. 706
  • 7: It is not possible to increase the speed by 10% as the maximum limiting is active. p. 706
  • 8: The torque difference after the speed setpoint step is too low in order to be able to still reliably identify the moment of inertia. p. 706
  • 9: Too few data to be able to reliably identify the moment of inertia. p. 706
  • 10: After the setpoint step, the speed either changed too little or in the incorrect direction. p. 706
  • 11: The identified moment of inertia is not plausible. p. 706
  • For fault value = 1: p. 706
  • Re fault value = 2, 5: p. 706
  • Re fault value = 3, 6: p. 706
  • Re fault value = 4, 7: p. 706
  • For fault value = 8: p. 706
  • For fault value = 9: p. 706
  • For fault value = 10: p. 706
  • Note: 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. - adapt the speed setpoint (p1965) or adapt the moment of inertia (refer to p0341, p0342). De-select rotating measurement (p1960), enter the moment of inertia p0342, re-calculate the speed controller p0340 = 4 and repeat the measurement. p. 706
  9. - check the moment of inertia (p0341, p0342). After the change, re-calculate (p0340 = 3 or 4). p. 706
  10. The moment of inertia identification routine can be disabled using p1959.2. p. 706

If F07984 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 F07984; 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.