Mitsubishi Electric FX3G SERIES Programming Manual page 891

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Error PLC operation at
code error occurrence
Operation error [M8067(D8067)]
6748
6749
6750
6751
6752
6753
Continues
operation
6754
6755
6756
6757
6758
6759
6760
Contents of error
PID output upper limit set value < PID output lower limit
set value.
Abnormal PID input variation alarm set value or output
variation alarm set value (Set value < 0)
<Step response method>
Improper auto tuning result
<Step response method>
Auto tuning operation direction mismatch
<Step response method>
Improper auto tuning operation
<Limit cycle method>
Abnormal output set value for auto tuning
[ULV (upper limit) ≤ LLV (lower limit)]
<Limit cycle method>
Abnormal PV threshold (hysteresis) set value for auto
tuning (SH < 0)
PV
<Limit cycle method>
Abnormal auto tuning transfer status
(Data of device controlling transfer status is abnormally
overwritten.)
<Limit cycle method>
Abnormal result due to excessive auto tuning
measurement time (τon > τ, τon < 0, τ < 0)
<Limit cycle method>
Auto tuning result exceeds proportional gain. (KP=
outside range from 0 to 32767)
<Limit cycle method>
Auto tuning result exceeds integral time.
(T = outside range from 0 to 32767)
I
<Limit cycle method>
Auto tuning result exceeds derivative time.
(T = outside range from 0 to 32767)
D
ABS data read from servo sum check error
38 Error Check Method and Error Code List
38.4 Error Code List and Action
Action
<Transpose of output upper limit value and output lower
limit value. → PID operation is continued.>
Verify that the target setting contents are correct.
<Alarm output is not given. → PID operation is
continued.>
Verify that the target setting contents are correct.
<Auto tuning is finished. → PID operation is started.>
• The deviation at start of auto tuning is 150 or less.
• The deviation at end of auto tuning is 1/3 or more of
the deviation at start of auto tuning.
Check the measured value and target value, and then
execute auto tuning again.
<Auto tuning is forcibly finished. → PID operation is not
started.>
The operation direction estimated from the measured
value at the start of auto tuning was different from the
actual operation direction of the output during auto
tuning.
Correct the relationship among the target value, output
value for auto tuning, and the measured value, and then
execute auto tuning again.
<Auto tuning is finished. → PID operation is not started.>
Because the set value was fluctuated during auto tuning,
auto tuning was not executed correctly.
Set the sampling time to a value larger than the output
change cycle, or set a larger value for the input filter
constant.
After changing the setting, execute auto tuning again.
<Auto tuning is forcibly finished. → PID operation is not
started.>
Verify that the target setting contents are correct.
<Auto tuning is forcibly finished. → PID operation is not
started.>
Ensure that devices occupied by PID instruction are not
overwritten in the program.
<Auto tuning is forcibly finished. → PID operation is not
started.>
The auto tuning time is longer than necessary.
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 (α), or set a
smaller value to the PV threshold (SH
and then check the result for improvement.
= 32767). → PID operation is
<Auto tuning is finished (K
P
started.>
The variation of the measured value (PV) is small
compared with the output value. Multiply the measured
value (PV) by "10" so that the variation of the measured
value will increase during auto tuning.
= 32767). → PID operation is
<Auto tuning is finished (K
P
started.>
The auto tuning time is longer than necessary.
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 (α), or set a
smaller value to the PV threshold (SH
and then check the result for improvement.
Check servo wiring and parameter setting. Also check the
ABS instruction.
31
32
33
34
35
36
37
) for auto tuning,
PV
38
A
) for auto tuning,
PV
B
889