46
PRECAUTIONS FOR MAINTENANCE
AND INSPECTION
7.4 Daily and Periodic Inspection
*1 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
Custo-
mer's
Check
Daily
Periodic *1
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.
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
Check cable sheaths for breakage
and deterioration (crack,
discoloration, etc.).
{
Contact the
manufacturer.
Terminal block Check for damage.
{
Stop the device
and contact the
manufacturer.
Resistor
(1)Check for crack in resistor
insulation.
{
Contact the
manufacturer.
(2) Check for unusual odor.
{
Contact the
manufacturer.
Control circuit/protective circuit
Operation
check
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
Check for liquid leakage in a
capacitor and deformation trance.
{
Contact the
manufacturer.
Cooling system
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.
Indication
Indication
(1)Check that display is normal.
{
Contact the
manufacturer.
(2)Check for stain.
{
Clean.
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