Mitsubishi Electric 800 Series Instruction Manual page 650

Check
Possible cause
points
For the separated converter type, terminals
RDA and SE of the converter unit are not
connected to terminals MRS (X10 signal) and
Input
SD (PC for source logic) of the inverter
respectively.
signal
Two-wire or three-wire type connection is
incorrect.
Under V/F control, Pr.0 Torque boost setting
is improper.
Pr.78 Reverse rotation prevention selection
is set.
Pr.79 Operation mode selection setting is
incorrect.
Bias and gain (Pr.902 to Pr.905) settings are
improper.
Pr.13 Starting frequency setting is greater
than the set frequency.
Frequency settings of various set frequency
(such as multi-speed operation) are zero.
Especially, Pr.1 Maximum frequency is zero.
Pr.15 Jog frequency is lower than Pr.13
Starting frequency for JOG operation.
The Pr.359 (Pr.852) Encoder rotation
direction setting is incorrect under encoder
feedback control or under vector control.
When a vector control compatible option is
used, the option to be used and parameter
settings do not match.
Operation mode and a writing device do not
Parameter
correspond.
setting
Start signal operation selection is set by
Pr.250 Stop selection.
The motor has decelerated to a stop when
power failure deceleration stop function is
selected.
Performing auto tuning.
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.)
The motor test operation is selected under
vector control or PM sensorless vector control.
When the FR-CC2 is used, the input logic
setting of the X10 signal is incorrect.
Load is too heavy.
Load
Shaft is locked.
Check first when you have a trouble
Countermeasure
Check for the wiring.
Check the wiring.
Use the Start self-holding selection (STP (STOP)) signal when
the three-wire type is used.
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 when you want to limit the motor rotation to only one
direction.
Select the operation mode which corresponds with input
methods of start command and frequency command.
Check the bias and gain (Pr.902 to Pr.905) settings.
Set frequency higher than Pr.13.
The inverter does not start if the frequency setting signal is less
than the value set in Pr.13.
Set the frequency command according to the application.
Set Pr.1 higher than the actual frequency used.
Set Pr.15 higher than Pr.13.
If the "REV" on the operation panel is lit even though the
forward-rotation command is given, set Pr.359 (Pr.852) = "1".
Correctly set Pr.862 Encoder option selection according to
the option to be used.
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.
Check the Pr.250 setting and the connection of 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 or 12", the
motor automatically restarts after the power is restored.
When offline auto tuning ends, press
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.)
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.
Check the Pr.800 Control method selection setting.
Set Pr.599="0" 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.
Reduce the load.
Inspect the machine (motor).
PROTECTIVE FUNCTIONS
Refer to
page
Refer to the
Instruction
Manual
(Hardware)
of the FR-
A862.
421
589
308
291
402
283, 284
314, 329
283, 284,
312
64, 619
141
291, 301
421
526
of the operation
426, 523
326, 515,
526
137
608
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649
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