The ratio between multi-turn resolution and modulo range is not an integer, causing position adjustment to reset. The manual's first action is: “Make the ratio between the multi-turn resolution and the modulo range an integer number. The ratio v is calculated as follows: • Motor encoder without position tracking (p29243 = 0); - For multi-turn encoders: v = (4096 * p29247 * p29248)/(p29249 * p29246) - For single-turn encoders: v = (p29247 * p29248)/(p29249 * p29246) • Motor encoder with position tracking (p29243 = 1); v = (p29244 * p29247)/p29246”
- Model
- Siemens SINAMICS V90, SIMOTICS S-1FL6
- Display shows
- LR: multi-turn does not match the modulo range (F7442)
- Type
- Fault code
- Source
- Manual p. 292
What F7442 means
LR: multi-turn does not match the modulo range p. 292
Common causes
- The ratio between the multi-turn resolution and the modulo range (p29246) is not an integer number. This results in the adjustment being set back, as the position actual value cannot be reproduced after power-off/power-on. p. 292
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
- Make the ratio between the multi-turn resolution and the modulo range an integer number. The ratio v is calculated as follows: • Motor encoder without position tracking (p29243 = 0); - For multi-turn encoders: v = (4096 * p29247 * p29248)/(p29249 * p29246) - For single-turn encoders: v = (p29247 * p29248)/(p29249 * p29246) • Motor encoder with position tracking (p29243 = 1); v = (p29244 * p29247)/p29246 p. 292
If F7442 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 F7442; 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.