Auto tuning time is longer than necessary due to insufficient range or filter settings. The manual's first action is: “• Increase the difference (ULV - LLV) between the upper limit and lower limit of the output value for auto tuning, set a smaller value to the input filter constant (q), or set a smaller value to the PV threshold (SHPV) for auto tuning, and then check the result for improvement. The operation is continued with KP = 32767.”
- Model
- Mitsubishi MELSEC iQ-F Series
- Display shows
- Operation error (351CH)
- Type
- Error code
- Source
- Manual p. 283
What 351CH means
Operation error p. 283
Common causes
- • The auto tuning time is longer than necessary. p. 283
What to do
- • Increase the difference (ULV - LLV) between the upper limit and lower limit of the output value for auto tuning, set a smaller value to the input filter constant (q), or set a smaller value to the PV threshold (SHPV) for auto tuning, and then check the result for improvement. The operation is continued with KP = 32767. p. 283
If 351CH is still not resolved
The manual gives no further instruction for this code. Open the code table in the PDF or contact Mitsubishi service.
This page summarises what the manufacturer’s manual says about 351CH; 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 Mitsubishi. Found a mistake? Report an error.