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Inspection item
6
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
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.
Area of
Inspection
Inspection Item Description
Interval
Corrective Action at
Alarm Occurrence
Customer's
Check
Daily
Periodic
*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 172)
{
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
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
Parts check
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 trace.
{ Contact the manufacturer
(2)
Visual check and judge by the life check of the
control circuit capacitor.
(Refer to page 172.)
{
Cooling
system
Cooling fan
(1)Check for unusual vibration and noise. { Replace the fan
(2)Check for loose screws and bolts. {
Fix with the fan cover fixing
screws
(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.