Mitsubishi FR-S500 Installation Manual download pdf (Page 25)

Error message

Meaning Description Remedy

Display

FR-PU04

LED-

display

PU Leave

Out

Parameter unit

connection error

A connection error between in

-

verter and external parameter

unit occurred during operation.

This alarm is only returned, if Pr.

17 is set to “1”.

Check the connection of the pa

-

rameter unit.

Automatic re

-

start retry ex

-

ceeded

After activation of a protective

function the inverter failed to be

restarted automatically within

the number of retries specified

in Pr. 67.

Remedy the actual cause of the

originary protective function.

CPU

Fault

CPU error

Failure on CPU printed circuit

board.

Contact the MITSUBISHI ELEC

-

TRIC customer service

PS

Inverter was

stopped via con

-

trol panel or PU

STOP key on the control panel

or PU was pressed during exter

-

nal operating mode.

Check Pr. 75.

OL

Overcurrent

during

acceleration

If a current of more than 150 %



of the rated inverter current

flows in the motor, this function

stops the increase of the fre

-

quency until the overload cur

-

rent reduces to prevent the in

-

verter from resulting in

overcurrent shut-off.

Change the acceleration/deceler

-

ation time. Increase the stall pre

-

vention operation level via Pr. 22.

Disable the stall prevention via Pr.

21. Check whether the torque

boost in Pr. 0 is set higher than re

-

quired.

Overcurrent

during constant

speed

If a current of more than 150 %



of the rated inverter current

flows in the motor, this function

lowers the frequency until the

overload current reduces to pre-

vent the inverter from resulting

in overcurrent shut-off.

Overcurrent

during decelera-

tion

If a current of more than 150 %

of the rated inverter current

flows in the motor, this function

stops the decrease of the fre-

quency until the overload cur-

rent reduces to prevent the in-

verter from resulting in

overcurrent shut-off.

oL

Overvoltage

during

deceleration

If the regenerative energy of the

motor exceeds the brake capac

-

ity of the inverter, this function

stops the decrease of the fre

-

quency to prevent overvoltage

shut-off. When the regenerative

energy has reduced, decelera

-

tion resumes.

Increase the deceleration time

using Pr. 8 “deceleration time”.

Undervoltage

The power supply voltage is too

low.

Check the power supply

voltage.

Write error

Write was performed with “1”

(write disable) set in Pr. 77 or

frequency jump setting range

overlapped or parameter write

was performed via the control

panel although it was not write

enabled.

Check the settings of Pr. 77, 31 to

36, and n17.

OPERATOR

ERR

Write error

Write was performed during op

-

eration or in the external opera

-

tion mode or an attempt was

made to change the operation

mode set by an operation com

-

mand via Pr. 79.

Stop operation before changing

settings.

Select PU (parameter unit) oper

-

ation mode.

Calibration error

Analog input bias and gain are

set too closely.

Check the settings of Pr. C3, C4,

C6, and C7.

햲

The current limit value (Pr. 22) can be changed. By default, it is set to 150%.

Protective Functions

FR-S 500 EC/ECR 25

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