Alarm codeA7440
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
Safety warnings — read before you start
- DANGERGeneral Safety Instructions. 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. p. 2
- WARNINGRisk of Electric Shock and Fire. Risk of electric shock and fire from supply networks with an excessively low impedance Excessively high short-circuit currents can lead to the protective devices not being able to interrupt these short-circuit currents and being destroyed, and thus causing electric shock or a fire. p. 12
- WARNINGElectric Shock if No Ground Connection. Electric shock if there is no ground connection For missing or incorrectly implemented protective conductor connection for devices with protection class I, high voltages can be present at open, exposed parts, which when touched, can result in death or severe injury. p. 12
- WARNINGElectric Shock Due to Unsuitable Power Supply. Electric shock due to connection to an unsuitable power supply When equipment is connected to an unsuitable power supply, exposed components may carry a hazardous voltage that might result in serious injury or death. p. 12
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
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.