Mitsubishi FR-A800

Check first when you have a trouble
PROTECTIVE FUNCTIONS
665
6
Input
signal
For the separated converter type, terminals
RDA and SE of the converter unit are not
connected to terminals MRS (X10 signal) and
SD (PC for source logic) of the inverter
respectively.
Check for the wiring.
Refer to the
Instruction
Manual
(Hardware)
of the FR-
A802.
Two-wire or three-wire type connection is
incorrect.
Check the wiring.
Use the Start self-holding selection (STP (STOP)) signal when
the three-wire type is used.
436
Parameter
Setting
Under V/F control, Pr.0 Torque boost setting
is improper.
Increase the Pr.0 setting by 0.5% increments while observing
the rotation of a motor.
If that makes no difference, decrease the setting.
597
Pr.78 Reverse rotation prevention selection
is set.
Check the Pr.78 setting.
Set Pr.78 when you want to limit the motor rotation to only one
direction.
323
Pr.79 Operation mode selection setting is
incorrect.
Select the operation mode which corresponds with input
methods of start command and frequency command.
306
Bias and gain (calibration parameter C2 to
C7) settings are improper.
Check the bias and gain (calibration parameter C2 to C7)
settings.
415
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.
298, 299
Frequency settings of various running
frequency (such as multi-speed operation) are
zero.
Especially, Pr.1 Maximum frequency is zero.
Set the frequency command according to the application.
Set Pr.1 higher than the actual frequency used.
328, 345
Pr.15 Jog frequency is lower than Pr.13
Starting frequency for JOG operation.
Set Pr.15 higher than Pr.13.
298, 299,
327
The Pr.359 Encoder rotation direction
setting is incorrect under encoder feedback
control or under vector control.
If the "REV" on the operation panel is lit even though the
forward-rotation command is given, set Pr.359 = "1".
68, 626
Operation mode and a writing device do not
correspond.
Check Pr.79 Operation mode selection, Pr.338
Communication operation command source, Pr.339
Communication speed command source, Pr.550 NET mode
operation command source selection and Pr.551 PU mode
operation command source selection, and select an
operation mode suitable for the purpose.
306,
316
S
tart sign
al operation selection is set by
Pr.250 Stop selection.
Check the Pr.250 setting and the connection of STF and STR
signals.
436
The motor has 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.
When Pr.261 Power failure stop selection = "2 or 12", the
motor automatically restarts after the power is restored.
540
Performing auto tuning.
When offline auto tuning ends, press 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 tuning, and the PU's
monitor display returns to the normal indication.
(Without this operation, next operation cannot be started.)
442, 537
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.)
Set Pr.872 Input phase loss protection selection ="1" (input
phase failure protection active).
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.
342, 528,
534, 540
The motor test operation is selected under
vector control or PM sensorless vector control.
Check the Pr.800 Control method selection setting. 164
When the FR-HC2, FR-CV, or FR-CC2 is
used, the input logic setting of the X10 signal
is incorrect.
Set Pr.599="0" (initial value for standard models and IP55
compatible models) to use the X10 signal with the NO contact
input specification, and Pr.599="1" (initial value for separated
converter types) to use the X10 signal with the NC contact input
specification.
614
Load
Load is too heavy. Reduce the load. 
Shaft is locked. Inspect the machine (motor). 
Check
points
Possible cause Countermeasure
Refer to
page