Mitsubishi FR-S500 Instruction Manual download pdf (Page 49)

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

Function Name Definition

(OC1)

Overcurrent cut-off during

acceleration

The inverter output current rose to or

above about 200% of the rated inverter

current during acceleration.

(OC2)

Overcurrent cut-off during

constant speed

The inverter output current rose to or

above about 200% of the rated inverter

current during constant-speed operation.

(OC3)

Overcurrent cut-off during

deceleration

The inverter output current rose to or

above about 200% of the rated inverter

current during deceleration.

(OV1)

Regenerative overvoltage

cut-off during acceleration

Excessive regenerative energy or surge

voltage occurred during acceleration.

(OV2)

Regenerative overvoltage

cut-off during constant

speed

Excessive regenerative energy or surge

voltage occurred during constant speed.

(OV3)

Regenerative overvoltage

cut-off during deceleration

or stop

Excessive regenerative energy or surge

voltage occurred during deceleration or

stop.

(THM)

Motor overload cut-off

(Electronic thermal

overcurrent protection) (*1)

Overload or reduced cooling capability

during low-speed operation

Protection from burning due to motor

temperature rise

(THT)

Inverter overload cut-off

(Electronic thermal

overcurrent protection) (*1)

Current more than 150% of the rated

output current flew and overcurrent shut-off

did not occur.

Output transistor protection from overheat

(FIN)

Fin overheat Temperature rise of the heat sink.

(GF)

Start-time output side

ground fault overcurrent

protection (*2)

Ground fault occurred on the inverter's

output side.

(OHT)

External thermal relay (*3)

External thermal relay provided for

protection from overheat was actuated

(contact open).

(OLT)

Stall prevention (overload)

Stall prevention was activated to drop the

running frequency to 0. (OL appears while

stall prevention is activated.)

(OPT)

Communication error

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.)

(PE)

Parameter error Error occurred in the parameter stored.

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Mitsubishi FR-S500 Instruction Manual Page 49

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