Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 197

Area of
Inspection
Inspec-
Item
tion
Inverter
module, Check resistance
Converter across terminals.
module
(1) Check for liquid
(2) Check for safety
Smoothing
capacitor
Main (3) Measure
circuit
(1) Check for chatter
Relay (2) Check for rough
(1) Check for crack in
(2) Check for open
Resistor
(1) Check balance of
Control
circuit Operation
Protec- check (2) Perform sequence
tive circuit
(1) Check for unusual
Cooling
Cooling fan
system (2) Check for loose
(1) Check if LED lamp
Display
(2) Clean.
Display
Check that reading is
normal.
Meter
(1) Check for unusual
(2) Check for unusual
General
Motor
(1) Check with megger
Insulation
resistance
Note: The value for the 400V class is indicated in the parentheses.
Daily and Periodic Inspection
Description
Daily
{
leakage.
{
valve projection and
bulge.
electrostatic
capacity.
during operation.
surface on
contacts.
resistor insulation.
cable.
output voltages
across phases with
inverter operated
independently.
protective operation
test to make sure of
no fault in protective
and display circuits.
{
vibration and noise.
connection.
{
is blown.
{
{
vibration and noise.
{
odor.
(across terminals
and ground
terminal).
PROTECTIVE FUNCTIONS
Interval
Periodic
Method
1 2
year years
Disconnect cables
from inverter and
measure across
{
terminals R, S, T, P,
N and U, V, W, P, N
〈L , +, − and
, L , L
1 2 3
U, V, W, +, −〉 with
tester range of 100Ω.
(1), (2) Visual check.
(3) Measure with
capacity meter.
{
{
(1) Auditory check.
(2) Visual check.
{
{
(1) Visual check.
Cement resistor,
{
wire-wound
resistor.
(2) Disconnect one
end and measure
with tester.
{
(1) Measure voltage
across inverter
output terminals
U-V-W.
(2) Simulatively
{
connect or
disconnect
inverter protective
circuit output
terminals.
(1) Turn by hand with
power off.
{
(2) Re-tighten
(1) Light indicator
lamps on panel.
{
(2) Clean with rag.
Check reading of
meters on panel.
(1) Auditory, sensory,
visual checks.
(2) Check for unusual
odor due to
overheating,
damage, etc.
{
(1) Disconnect cables
from U, V, W,
including motor
cables.
184
Crlterlon Instrument
(See the following
Analog meter
pages)
(1), (2) No fault.
(3) 85% or more
of rated capacity.
Capacity
meter
(1) No fault.
(2) No fault.
(1) No fault.
(2) Error should
be within
Meter, digital
±10% of
multimeter
indicated
resistance
value.
(1) Phase-to-
phase voltage
balance within
4V (8V) for Digital
200V (400V). multimeter,
(2) Fault must rectifier type
occur because voltmeter
of sequence.
No unusual
vibration, unusual
noise.
(1) Check that
lamps are lit.
Must satisfy
specified and Voltmeter,
management ammeter, etc.
values.
(1), (2) No fault.
(1) 5M Ω or more
500V megger