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212
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Note: Values in parrentheses indicate those for 400V class.
*Consult us for periodic inspection.
Area of
Inspec
-tion
Inspect
ion
Item
Description
Interval
Method Criterion Instrument
Cus-
tomers
check
Daily
Periodic
1
year
2
year
Main
circuit
Inverter
module,
Convert
er
module
Check resistance
across terminals.
{
Disconnect all
cables from the
inverter and
measure across
terminals R, S, T,
P, N and U, V, W,
P, N with a meter
range of 100Ω.
(Refer to page
213)
Analog
tester
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.
(2) Check for open
cable.
{
{
(1) Visual check.
Cement
resistor, wire-
wound resistor.
(2) Disconnect one
end and
measure with a
meter.
(1) No fault.
(2) Error should
be within
±10% of
indicated
resistance
value.
Meter,
digital
multimeter
Control
circuit
Protec-
tive
circuit
Operati
on
check
(1) Check balance of
output voltages
across phases with
inverter operated
alone.
(2) Perform sequence
protective operation
test to ensure no
fault in protective
and display circuits.
{
{
(1) Measure
voltage across
inverter output
terminals U-V-
W.
(2) Simulatively
short or open
the protective
circuit output
terminals of the
inverter.
(1) Phase-to-
phase
voltage
balance
within 4V
(8V) for 200V
(400V).
(2) Fault must
occur
because of
sequence.
Digital
multimeter,
rectifier
type
voltmeter
Cooling
system
Cooling
fan
(1) Check for unusual
vibration and noise.
(2) Check for loose
connection.
{
{
(1) Turn by hand
with power off.
(2) Visual check.
No unusual
vibration,
unusual noise.
Display
Display
(1) Check for LED
lamp blown.
(2) Clean.
{
{
(1) Lamps indicate
indicator lamps
on panel.
(2) Clean with rag.
(1) Check that
lamps are lit.
Meter
Check that reading is
normal.
{ Check the readings
of meters on the
panel.
Must satisfy
specified and
management
values.
Voltmeter,
ammeter,
etc.
Motor
General
(1) Check for unusual
vibration and noise.
(2) Check for unusual
odor.
{
{
(1)Auditory,
sensory, visual
checks.
(2) Check for
unusual odor
due to
overheating,
damage, etc.
(1), (2) No fault.
Insulati
on
resistan
ce
(1) Check with megger
(across terminals
and earth (ground)
terminal).
{ (1) Disconnect
cables from U,
V, W, including
motor cables.
(1) 5M Ω or
more 500V
megger