The calculated jerk time exceeds the internal limit of 1000 ms due to excessively high acceleration or deceleration settings. The manual's first action is: “• Increase the jerk limiting (p2574). • Reduce maximum acceleration or maximum deceleration (p2572, p2573). See also: p2572 (EPOS maximum acceleration), p2573 (EPOS maximum deceleration), p2574 (EPOS jerk limiting)”
- Model
- Siemens SINAMICS V90, SIMOTICS S-1FL6
- Display shows
- EPOS: Jerk time is limited (A7440)
- Type
- Alarm code
- Source
- Manual p. 306
What A7440 means
EPOS: Jerk time is limited p. 306
Common causes
- The calculation of the jerk time Tr = max (p2572, 2573)/2574 resulted in an excessively high value so that the jerk time is internally limited to 1000 ms. p. 306
What to do
- • Increase the jerk limiting (p2574). • Reduce maximum acceleration or maximum deceleration (p2572, p2573). See also: p2572 (EPOS maximum acceleration), p2573 (EPOS maximum deceleration), p2574 (EPOS jerk limiting) p. 306
Before you service the product, read the safety instructions in the manual p. 2.
If A7440 is still not resolved
- Contact service / dealer for assistance p. 2 “Qualified Personnel The product/system described in this documentation may be operated only by personnel qualified for the specific task in accordance with the relevant documentation, in particular its warning notices and safety instructions.”
- Contact service / dealer for assistance p. 13 “NOTICE Property damage due to loose power connections Insufficient tightening torques or vibration can result in loose power connections. This can result in damage due to fire, device defects or malfunctions.”
This page summarises what the manufacturer’s manual says about A7440; 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.