Mitsubishi Electric FR-S500 Series, Instruction Manual

Page: 196 / 222

186
Precautions for maintenance and inspection
3.3.6 Daily and periodic inspection
Are
a
of
Insp
ecti
on
Inspection
Item
Inspection Item
Interval
Corrective
Action at Alarm
Occurrence
C
ustom
er'
s
Ch
ec
k
Da
ily
Pe
riodic
*2
Ge
n
era
l
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
M
ai
n ci
rc
ui
t
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