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Errors (Alarms)
(4) Write errors
Operation Panel
Indication
oL FR-PU04 oL
Name Stall prevention (overvoltage)
Description
During
deceleration
If the regenerative energy of the motor increases too much to
exceed the brake capability, this function stops the decrease
in frequency to prevent overvoltage shut-off. As soon as the
regenerative energy has reduced, deceleration resumes.
Check point Check for sudden speed reduction.
Corrective action
The deceleration time may change.
Increase the deceleration time using Pr. 8 "deceleration time".
Operation Panel
Indication
PS FR-PU04 PS
Name PU stop
Description
Pr. 75 "reset selection/PU stop selection" has been set and a stop was
made by pressing the key of the operation panel or parameter unit
(FR-PU04) during operation in the external operation mode.
Check point
Check for a stop made by pressing the key of the operation panel
during external operation.
Corrective action Refer to page 71.
Operation Panel
Indication
UV
Name Undervoltage
Description
If the power supply voltage of the inverter reduces, the control circuit will
not operate properly and will result in decreased motor torque or increased
heat generation. To prevent this, if the power supply voltage reduces below
about 115VAC, this function stops the inverter output.
Check point
• Check for a start of large-capacity motor.
• Check that the power supply capacity is as indicated in the specifications
(refer to page 178).
Corrective action Check the power supply system equipment such as the power supply.
Operation Panel
Indication
Er1 FR-PU04 Control Mode
Name Write disable error
Description
• Write was performed using the parameter unit with "1" (write disable) set
in Pr. 77 "parameter write disable selection".
Corrective action
• Check the setting of Pr. 77 "parameter write disable selection". (Refer to
page 74.)
Operation Panel
Indication
Er2 FR-PU04
In PU/EXT Mode
OPERATOR ERR
Name Write-while-running error/mode designation error
Description
• Write was performed during operation using the parameter unit.
• An attempt was made to change the Pr. 79 setting to the operation mode
where the operation command has been input.
• Write was performed in the external operation mode using the parameter unit.
Corrective action
• After stopping operation, make parameter setting.
• After setting the operation mode to the "PU operation mode", make
parameter setting. (Refer to page 75.)
STOP
RESET
STOP
RESET