Errors And Protective Functions - Mitsubishi FR-S520-0.1K to 3.7K(-R)(-C) Instruction Manual

7. ERRORS AND PROTECTIVE FUNCTIONS

7.1 About Errors (Definitions)
When an alarm occurs in the inverter, the protective function is activated to bring
the inverter to an alarm stop and the PU display automatically changes to any of
the following error (alarm) indications.
For details, refer to the instruction manual (detailed) which is separately available.
(1) Major failures
Control Panel
Indication
Overcurrent cut-off during
(OC1)
acceleration
Overcurrent cut-off during
(OC2)
constant speed
Overcurrent cut-off during
(OC3)
deceleration
Regenerative overvoltage
(OV1)
cut-off during acceleration
Regenerative overvoltage
cut-off during constant
(OV2)
speed
Regenerative overvoltage
cut-off during deceleration
(OV3)
or stop
Motor overload cut-off
(THM) (Electronic thermal
overcurrent protection) (*1)
Inverter overload cut-off
(Electronic thermal
(THT)
overcurrent protection) (*1)
Fin overheat
(FIN)
Start-time output side
ground fault overcurrent
(GF)
protection (*2)
External thermal relay (*3)
(OHT)
Stall prevention (overload)
(OLT)
Communication error
(OPT)
Parameter error
(PE)
Function Name
37
Definition
The inverter output current rose to or
above about 200% of the rated inverter
current during acceleration.
The inverter output current rose to or
above about 200% of the rated inverter
current during constant-speed operation.
The inverter output current rose to or
above about 200% of the rated inverter
current during deceleration.
Excessive regenerative energy or surge
voltage occurred during acceleration.
Excessive regenerative energy or surge
voltage occurred during constant speed.
Excessive regenerative energy or surge
voltage occurred during deceleration or
stop.
Overload or reduced cooling capability
during low-speed operation
Current more than 150% of the rated
output current flew and overcurrent shut-off
did not occur.
Temperature rise of the heat sink.
Ground fault occurred on the inverter's
output side.
External thermal relay provided for
protection from overheat was actuated
(contact open).
Stall prevention was activated to drop the
running frequency to 0. (OL appears while
stall prevention is activated.)
Communication errors occurred
consecutively more than the permissible
number of retries when the RS-485
connector is used and communication
parameter n5 = "- - -".
RS-485 communication error occurred.
Communication was broken for a period
set in communication parameter n6.
(Only for the type with RS-485 function.)
Error occurred in the parameter stored.