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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 198

Transistorized inverter, high function & low acoustic noise.
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Area of
Inspection
Inspec-
Description
Item
tion
Inverter
module,
Check resistance
Converter
across terminals.
module
(1) Check for liquid
leakage.
(2) Check for safety
Smoothing
valve projection and
capacitor
bulge.
Main
(3) Measure
circuit
electrostatic
capacity.
(1) Check for chatter
during operation.
Relay
(2) Check for rough
surface on
contacts.
(1) Check for crack in
resistor insulation.
(2) Check for open
Resistor
cable.
(1) Check balance of
output voltages
across phases with
Control
inverter operated
circuit
Operation
independently.
Protec-
check
(2) Perform sequence
tive circuit
protective operation
test to make sure of
no fault in protective
and display circuits.
(1) Check for unusual
Cooling
vibration and noise.
Cooling fan
system
(2) Check for loose
connection.
(1) Check if LED lamp
Display
is blown.
(2) Clean.
Display
Check that reading is
normal.
Meter
(1) Check for unusual
vibration and noise.
(2) Check for unusual
General
odor.
Motor
(1) Check with megger
Insulation
(across terminals
resistance
and ground
terminal).
Note: The value for the 400V class is indicated in the parentheses.
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PROTECTIVE FUNCTIONS
Daily and Periodic Inspection
Interval
Periodic
Method
Daily
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
1
, L
2
, L
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

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