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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 222

Freqrol-cs80.
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Check
Possible cause
point
Pr.0 Torque boost setting is improper
when V/F control is used.
Pr.78 Reverse rotation prevention
selection is set.
Pr.79 Operation mode selection setting
is incorrect.
The bias and gain (the calibration
parameter C2 to C7) settings are not
appropriate.
The Pr.13 Starting frequency setting is
greater than the running frequency.
Zero is set in various running frequency
settings (such as for multi-speed
operation).
Especially, Pr.1 Maximum frequency is
zero.
Pr.15 Jog frequency is lower than Pr.13
Starting frequency during JOG
operation.
Parameter
setting
Operation mode and a writing device do
not correspond.
The start signal operation selection is set
by Pr.250 Stop selection.
The motor has decelerated to a stop
when the power failure deceleration stop
function is selected.
Auto tuning is being performed.
The automatic restart after instantaneous
power failure function or power failure
stop function has been activated.
(Performing overload operation during
input phase loss may cause voltage
insufficiency, and that may result in
detection of power failure.)
Load is too heavy.
Load
The shaft is locked.
Countermeasure
Increase the Pr.0 setting by 0.5% increments while observing the
rotation of a motor.
If that makes no difference, decrease the setting.
Check the Pr.78 setting. Set Pr.78 to limit the motor rotation to only
one direction.
Select the operation mode suitable for the input methods of the start
command and frequency command.
Check the bias and gain (the calibration parameter C2 to C7)
settings.
Set the running frequency higher than the one set in Pr.13.
The inverter does not start if the frequency setting signal has a value
lower than that of Pr.13.
Set the frequency command according to the application. Set Pr.1
equal to or higher than the actual frequency used.
The Pr.15 setting should be equal to or higher than the Pr.13 setting. 99,
Check Pr.79 Operation mode selection, Pr.338 Communication
operation command source, Pr.339 Communication speed
command source, and Pr.551 PU mode operation command source
selection, and select an operation mode suitable for the purpose.
Check the Pr.250 setting and the connection of the STF and STR
signals.
When power is restored, ensure the safety, and turn OFF the start
signal once, then turn ON again to restart. When Pr.261 Power
failure stop selection = "2", the motor automatically restarts after the
power is restored.
When offline auto tuning ends, press the
panel for the PU operation. For the External operation, turn OFF the
start signal (STF or STR).
This operation resets the offline auto tuning, and the PU's monitor
display returns to the normal indication.
(Without this operation, next operation cannot be started.)
Disable the automatic restart after instantaneous power failure
function and power failure stop function.
Reduce the load.
Increase the acceleration time if the function was activated during
acceleration.
Reduce the load.
Inspect the machine (motor).
Refer to
page
193
108
100
134
99,
109,
100,
145
160
key of the operation
147
115, 159,
160
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble
1
2
3
93
5
117
6
108
7
105
8
9
10
221

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