Mitsubishi FR-S500 Instruction Manual download pdf (Page 80)

75

Precautions for maintenance and inspection

ERRORS AND PROTECTIVE FUNCTIONS

7

7.7.4 Daily and periodic inspection

Area of

Inspection

Inspection

Item

Inspection Item

Interval

Corrective

Action at Alarm

Occurrence

Customer's

Check

Daily

Periodic

*2

General

Surrounding

environment

Check the ambient temperature,

humidity, dirt, corrosive gas, oil

mist, etc

{

Improve

emvironment

Overall unit

Check for unusual vibration and

noise

{

Check alarm

location and

retighten

Power supply

voltage

Check that the main circuit voltages

and control voltages are normal

*1

{

Inspect the power

supply

Main circuit

General

(1) Check with megger (across main

circuit terminals and earth

(ground) terminal).

{

Contact the

manufacturer

(2) Check for loose screws and

bolts.

{ Retighten

(3) Check for overheat traces on the

parts.

{

Contact the

manufacturer

(4) Check for stain { Clean

Conductors,

cables

(1) Check conductors for distortion.

(2) Check cable sheaths for

breakage and deterioration

(crack, discoloration, etc.)

{

Contact the

manufacturer

{

Contact the

manufacturer

Transformer/

reactor

Check for unusual odor and

abnormal increase in whining

sound.

{

Stop the device

and contact the

manufacturer.

Terminal block Check for damage. {

Stop the device

and contact the

manufacturer.

Smoothing

aluminum

electrolytic

capacitor

(1) Check for liquid leakage. {

Contact the

manufacturer

(2) Check for safety valve projection

and bulge.

{

Contact the

manufacturer

Relay/

contactor

Check that the operation is normal

and no chatter is heard.

{

Contact the

manufacturer

Resistor

(1) Check for crack in resistor

insulation.

{

Contact the

manufacturer

(2) Check for a break in the cable. {

Contact the

manufacturer

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