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34
Precautions for Maintenance and Inspection
3.2.6 Daily and Periodic Inspection
Area of
Inspection
Inspection
Item
Description
Interval
Method Criterion Instrument
Customer
setting
Daily
Periodic
1 year
2 year
General
Surrounding
environment
Check ambient
temperature,
humidity, dust, dirt,
etc.
{
(Refer to page 10)
Ambient
temperature:
(constant torque)
-10°C to + 50°C
(14°F to 122°F),
non-freezing.
(Variable torque)
-10°C to + 40°C
(14°F to 104°F),
non-freezing.
Ambient humidity:
90% or less,
non-condensing.
Thermometer,
hygrometer,
recrder
Overall unit
Check for unusual
vibration and noese.
{
Visual and auditory
checks.
No fault.
Power
supply
voltage
Check that main
circuit voltage is
normal.
{
Measure voltage
across power
regeneration common
converter
terminals R2/L1, S2/L2,
T2/L3.
Within permissible
AC voltage
fluctuation (Refer
to page 44)
Meter,
digital
multimeter
Mian circuit
General
(1) Check with
megger (across
main circuit
terminals and
ground termimal).
(2) Check for loose
screws and bolts.
(3) Check for
overheating of
each part.
(4)Clean.
{
{
{
{
(1) Disconnect all
cables from power
regeneration
common converter
and measure across
terminals R2/L1, S2/
L2, T2/L3, P/L+, N/
L- and ground
terminal with
megger.
(2) Re-tighten.
(3) Visual check.
(1) 5M
Ω or more.
(2),(3) No fault.
500VDC
class
megger
Conductors,
cables
(1) Check conductors
for distortion.
(2) Check cable
sheaths for
breakage.
{
{
(1), (2) Visual check. (1), (2) No fault.
Terminal
block
Check for damage.
{
Visual check. No fault
Converter
module
Check resistance
across terminals.
{
Disconnect cables from
inverter and measure
across terminals R2/L1,
S2/L2, T2/L3, P/L+,
N/L- with a meter
range of 100
Ω.
(Refer to page 35) Analog meter
Smoothing
capacitor
(1) Check for liquid
leakage.
(2) Check the safety
valve for
projection or
bulge.
(3) Measure
capacitance.
{
{
{
(1), (2) Visual check.
(3) Use capacitance
meter to make
measurement.
(1), (2) No fault.
(3) 85% or more of
rated capacitance.
Capacitance
meter
Relay
(1) Check for chatter
during operation.
(2) Check for rough
surface on
contacts.
{
{
(1) Auditory check.
(2) Visual check.
(1) No fault.
(2) No fault.
Resistor
(1) Check for crack in
resistor insulation.
{
(1) Visual check.
Cement resistor,
wire-wound resistor.
(1) No fault.