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List of fault displays
7.2 List of fault displays
When a fault occurs, the drive unit trips and the PU display automatically changes to one of the following fault or alarm indications.
The error message shows an operational error. The
drive unit
output is not shut off.
Warnings are messages given before faults occur. The
drive unit
output is not shut off.
Alarms warn the operator of failures with output signals. The
drive unit
output is not shut off.
When faults occur, the protective functions are activated to
drive unit
trip and output the fault signals.
Function Name Description Countermeasure Display
Error message
Operation panel lock
Operation has been attempted during the
operation panel lock.
Press for 2s to release lock.
Password locked
Reading/writing of a password-restricted
parameter has been attempted.
Enter the password in Pr. 297 Password lock/unlock to unlock the
password function before operating.
Write disable error
yParameter setting has been attempted
although parameter writing is set to be
disabled.
yOverlapping range has been set for the speed
jump.
yPU and the drive unit cannot make normal
communication.
yCheck the setting of Pr. 77 Parameter write selection.
yCheck the setting of Pr. 31 to Pr. 36 (speed jump).
yCheck the connection of PU and the drive unit.
Write error during
operation
Parameter writing has been attempted while a
value other than "2" is set in Pr. 77 Parameter
write selection and the STF (STR) is ON.
ySet "2" in Pr. 77 Parameter write selection.
yAfter stopping the operation, set parameters.
Calibration error
Analog input bias and gain calibration values
have been set too close.
Check the settings of calibration parameters C3, C4, C6 and C7
(calibration functions).
Mode designation error
yParameter setting has been attempted in the
External or NET operation mode when Pr. 77
Parameter write selection is not "2."
yParameter writing has been attempted when
the command source is not at the operation
panel.
yAfter setting the operation mode to the "PU operation mode",
set parameters.
ySet "2" in Pr. 77 Parameter write selection.
yRemove the parameter unit (FR-PU07), then set the Pr. 551
PU mode operation command source selection = "9999 (initial
setting)."
ySet Pr. 551 PU mode operation command source selection = "4."
Drive unit reset
The reset signal (RES signal) is ON.
(drive unit output is shutoff.)
yTurn OFF the reset command.
Warning
Stall prevention
(overcurrent)
The overcurrent stall prevention has been
activated.
ySet Pr.7 Acceleration time and Pr.8 Deceleration time longer.
yReduce the load
ySet the stall prevention operation current in
Pr. 22
Stall
prevention operation level. (The acceleration/deceleration time
may change.)Increase the stall prevention operation level
with
Pr. 22
Stall prevention operation level, or disable stall
prevention with
Pr. 156
Stall prevention operation selection.
(Operation at OL occurrence can be selected using
Pr. 156
Stall prevention operation selection. )
yCheck the connection of the PM motor.
Stall prevention
(overvoltage)
The overvoltage stall prevention function or the
regeneration avoidance function has been
activated.
(This warning is also output during the
regeneration avoidance operation.)
Set the deceleration time longer.
Regenerative brake pre-
alarm *2
The regenerative brake duty has reached 85% of
the Pr. 70 Special regenerative brake duty setting or
higher.
ySet the deceleration time longer.
yCheck the Pr.30 Regenerative function selection and Pr. 70
Special regenerative brake duty settings.
Electronic thermal relay
function pre-alarm *1
The cumulative value of the electronic thermal O/
L relay has reached 85% of the Pr. 9 Electronic
thermal O/L relay setting or higher.
yReduce the load and frequency of operation.
ySet an appropriate value in Pr. 9 Electronic thermal O/L relay.
PU stop
on the operation panel has been pressed
during the External operation.
Turn the start signal OFF and release with .
Maintenance signal
output *2
The cumulative energization time has exceeded
the maintenance output timer set value.
Setting "0" in Pr. 503 Maintenance timer erases the signal.
Undervoltage
The voltage at the main circuit power has been
lowered.
Investigate the devices on the power supply line such as the
power supply itself.
SA
The shorting wire across the terminals S1 and
SC or the terminals S2 and SC is disconnected.
Short across the terminals S1 and SC and the terminals S2
and SC with shortening wires.
Alarm
Fan alarm
The cooling fan is at a standstill although it is
required to be operated. Cooling fan speed has
decelerated.
Check for fan failure. Please contact your sales representative.