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Precautions for maintenance and inspection
3
PROTECTIVE FUNCTIONS
3.3.6 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
environment
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