Mitsubishi Electric FR-D720S SC EC, Инструкция по эксплуатации, Страница: 458 / 512

Check first when you have troubles Troubleshooting
7 - 22
Parameter
Setting
Pr. 0 "Torque boost" setting is improper
when V/F control is used.
Increase Pr. 0 setting by 0.5% increments
while observing the rotation of a motor.
If that makes no difference, decrease the
setting.
6-26
Pr. 78 "Reverse rotation prevention selec-
tion" is set.
Check the Pr. 78 setting.
Set Pr. 78 when you want to limit the motor
rotation to only one direction.
6-167
Pr. 79 "Operation mode selection" setting
is wrong.
Select the operation mode which corre-
sponds with input methods of start com-
mand and frequency command.
6-175
Bias and gain (calibration parameter C2 to
C7) settings are improper. Check the bias and gain (calibration
parameter C2 to C7) settings.
6-153
Pr. 13 "Starting frequency" setting is
greater than the running frequency.
Set running frequency higher than Pr. 13.
The inverter does not start if the frequency
setting signal is less than the value set in
Pr. 13.
6-62
Frequency settings of various running fre-
quency (such as multi-speed operation)
are zero. Especially, Pr. 1 "Maximum fre-
quency" is zero.
Set the frequency command according to
the application. Set Pr. 1 higher than the
actual frequency used.
6-40
Pr. 15 "Jog frequency" setting is lower
than Pr. 13 "Starting frequency". Set Pr. 15 "Jog frequency" higher than
Pr. 13 "Starting frequency".
6-51
Operation mode and a writing device do
not match.
Check Pr. 79, Pr. 338, Pr. 339 and Pr. 551,
and select an operation mode suitable for
the purpose.
6-172,
6-186
Start signal operation selection is set by
the Pr. 250 "Stop selection". Check Pr. 250 setting and connection of
STF and STR signals.
6-94
Inverter decelerated to a stop when power
failure deceleration stop function is
selected.
When power is restored, ensure the safety,
and turn OFF the start signal once, then
turn ON again to restart.
Inverter restarts when Pr. 261="2".
6-134
Performing auto tuning.
When offline auto tuning ends, press the
STOP/RESET key of the operation panel
for the PU operation.
For the External operation, turn OFF the
start signal (STF or STR).
This operation resets the offline auto tun-
ing, and the PU's monitor display returns
to the normal indication.
(Without this operation, next operation
cannot be started.)
6-74
Automatic restart after instantaneous
power failure function or power failure stop
function is activated. (Performing overload
operation with single-phase power input
specification model may cause voltage
insufficiency, and results in a detection of
power failure.)
Disable the automatic restart after
instantaneous power failure function
and power failure stop function.
Reduce the load.
Increase the acceleration time if the
automatic restart after instantaneous
power failure function or power failure
stop function occurred during
acceleration.
6-123,
6-134
Load
Load is too heavy. Reduce the load. —
Shaft is locked. Inspect the machine (motor). —
Others
Operation panel display shows an error
(e.g. E.OC1).
When any fault occurs, take an appropri-
ate corrective action, then reset the
inverter, and resume the operation.
7-9
Check points Possible Cause Countermeasures
Refer to
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