Mitsubishi Electric FR-F800 Series Instruction Manual page 442

 PID gain tuning error
• When the read value of Pr.1219 or the PID gain tuning status monitor display is "9, 90 to 96", tuning has not been properly
completed due to a tuning error. Remove the cause of the tuning error, and perform tuning again.
Monitor value
9
90
91
92
93
94
95
96
 Fine adjustment after PID gain tuning
• If fine adjustment is required after completion of PID gain tuning, adjust the proportional band (Pr.129 or Pr.756), integral
time (Pr.130 or Pr.757), and differential time (Pr.134 or Pr.758).
The response is fast, but vibrations are observed.
Measured value[%]
Set point[%]
Optimal
Measured value[%]
Set point[%]
Response is slow.
Measured value[%]
Set point[%]
NOTE
• When the differential operation is used, adjust the differential time (Pr.134 or Pr.758) while checking the stability and the
response. (Increasing the differential time makes the differential effect larger, and decreasing the differential time makes the
differential effect smaller.)
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Error description
Termination of tuning due to
activation of an inverter protective
function
Input upper limit error
Input lower limit error
Deviation limit error
Timeout error
Calculation error
Setting error
PID mode error
Status of measurement values
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Cause of tuning error
An inverter protective function is activated.
The measured value is higher than the PID upper
limit (Pr.131 or Pr.1143).
The measured value is lower than the PID lower
limit (Pr.132 or Pr.1144).
The deviation exceeded the PID deviation limit
(Pr.553 or Pr.1145).
Tuning is not terminated within the time set in
Pr.1211 after the start of PID gain tuning.
The tuning calculation is inconsistent.
• PID control is disabled during tuning.
• The PID control setting has been changed
during tuning.
• In the limit cycle method, the Pr.1215 setting is
equal to or lower than the Pr.1216 setting.
• PID gain tuning has been started during
automatic switchover or pre-charge operation.
• A stall prevention or regeneration avoidance
operation occurred during PID gain tuning.
• A condition for output shutoff by the sleep
function was satisfied during PID gain tuning.
• Frequency fluctuation occurred because of the
frequency jump, maximum frequency, or
minimum frequency during PID gain tuning.
• Increase the proportional band (Pr.129 or Pr.756).
(Smaller proportional effect)
• Increase the integral time (Pr.130 or Pr.757).
(Smaller integral effect)
Time
—
Time
• Decrease the proportional band (Pr.129 or Pr.756).
(Larger proportional effect)
• Decrease the integral time (Pr.130 or Pr.757).
(Larger integral effect)
Time
Corrective action for error
Remedy the cause. (Refer to
page 594.)
Change the Pr.131 or Pr.1143
setting as appropriate.
Change the Pr.132 or Pr.1144
setting as appropriate.
Change the Pr.553 or Pr.1145
setting as appropriate.
Change the Pr.1211 setting as
appropriate.
In the step response method,
change the Pr.1212 and Pr.1213
settings as appropriate.
In the limit cycle method, change
the Pr.1217 setting as
appropriate.
• Enable PID control.
• Change the Pr.1215 and
Pr.1216 settings as
appropriate.
Change the setting of each
function as appropriate.
Adjustment method
5. PARAMETERS
5.11 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
441