Mitsubishi FX2-16E series, User Manual

Page: 294 / 520

FX
3U
Series Programmable Controllers
User’s Manual - Hardware Edition
286
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.6 Judgment by Error Codes and Representation of Error Codes
Operation error [M8067(D8067)]
6753
Continues
operation
<Limit cycle method>
Abnormal output set value for auto tuning
[ULV (upper limit)
≤
LLV (lower limit)]
<Auto tuning is forcibly finished.
→
PID operation is
not started.>
Check whether the target setting contents are
correct.
6754
<Limit cycle method>
Abnormal PV threshold (hysteresis) set value for
auto tuning (SH
PV
< 0)
6755
<Limit cycle method>
Abnormal auto tuning transfer status
(Data of device controlling transfer status is
abnormally overwritten.) <Auto tuning is forcibly finished.
→
PID operation is
not started.>
Ensure that devices occupied by PID instruction are
not overwritten in the program.
6756
<Limit cycle method>
Abnormal result due to excessive auto tuning
measurement time (
τ
on >
τ
,
τ
on < 0,
τ
< 0)
<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
PV
) for auto tuning, and then check the
result for improvement.
6757
<Limit cycle method>
Auto tuning result exceeds proportional gain. (K
P
=
outside range from 0 to 32767)
<Auto tuning is finished (K
P
= 32767).
→
PID
operation is 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.
6758
<Limit cycle method>
Auto tuning result exceeds integral time.
(T
I
= outside range from 0 to 32767)
<Auto tuning is finished (K
P
= 32767).
→
PID
operation is 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
PV
) for auto tuning, and then check the
result for improvement.
6759
<Limit cycle method>
Auto tuning result exceeds derivative time.
(T
D
= outside range from 0 to 32767)
6760 ABS data read from servo sum check error
Check servo wiring and parameter setting. Also
check ABS instruction.
6762
Port specified by inverter communication instruction
is already used in another communication. Check to make sure the port is not specified by
another instruction.
6763
1) Input (X) specified by DSZR, DVIT or ZRN
instruction is already used in another
instruction.
2) The interrupt signal device for DVIT instruction
is outside the allowable setting range.
1) Check to make sure the input (X), as specified
by DSZR, DVIT or ZRN instruction, is not being
used for the following purposes:
- Input interrupt (including the delay function)
- High-speed counter C235 to C255
- Pulse catch M8170 to M8177
- SPD instruction
2) Check the contents of D8336 for the correct
interrupt signal specification for DVIT instruction.
6764
Pulse output number is already used in a
positioning instruction or pulse output instruction
(PLSY, PWM, etc.).
Check to make sure the pulse output destination is
not being driven by another positioning instruction.
6765 Number of applied instruction exceeds limit.
The number of times an applied instruction is used
in the program exceeds the specified limit.
6770 Memory cassette write error
When the memory cassette is used, check whether
it is mounted correctly.
If the problem persists, something may be
malfunctioning inside the PLC. Consult your local
Mitsubishi Electric representative.
Error
code
PLC operation at
error occurrence
Contents of error Action