291
Inspection item
6
PR
E
C
A
U
T
IO
N
S
F
O
R
M
A
IN
T
EN
A
N
C
E
A
N
D
IN
SPE
C
T
IO
N
6.1.3
Daily and periodic inspection
*1 It is recommended to install a device to monitor voltage for checking the power supply voltage to the inverter.
*2 One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
Consult us for periodic inspection.
Are
a
o
f
Ins
pec
tion
Inspection Item
Inspection Item
Interval
Corrective Action at
Alarm Occurrence
Cu
st
ome
r's
Ch
ec
k
Da
ily
Period
ic
*2
General
Surrounding
environment
Check the surrounding air 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
(3)Visual check and judge by the life check of the
main circuit capacitor
(Refer to page 292)
{
Relay/contactor
Check that the operation is normal and no chatter
is heard.
{
Contact the manufacturer
Control
circuit
protective
circuit
Operation check
(1)Check that the output voltages across phases
with the inverter operated alone is balanced
{
Contact the manufacturer
(2)Check that no fault is found in protective and
display circuits in a sequence protective
operation test.
{
Contact the manufacturer
Pa
rt
s
ch
ec
k Overall
(1)Check for unusual odor and discoloration.
{
Stop the device and contact
the manufacturer.
(2)Check for serious rust development
{
Contact the manufacturer
Aluminum
electrolytic
capacitor
(1)Check for liquid leakage in a capacitor and
deformation trance
{
Contact the manufacturer
(2)Visual check and judge by the life check of the
control circuit capacitor.
(Refer to page 292.)
{
Cooling
system
Cooling fan
(1)Check for unusual vibration and noise.
{
Replace the fan
(2)Check for loose screws and bolts
{
Retighten
(3)Check for stain
{
Clean
Heatsink
(1)Check for clogging
{
Clean
(2)Check for stain
{
Clean
Air filter, etc.
(1)Check for clogging
{
Clean or replace
(2)Check for stain
{
Clean or replace
Display
Indication
(1)Check that display is normal.
{
Contact the manufacturer
(2)Check for stain
{
Clean
Meter
Check that reading is normal
{
Stop the device and contact
the manufacturer.
Load
motor
Operation check
Check for vibration and abnormal increase in
operation noise
{
Stop the device and contact
the manufacturer.
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