Mitsubishi Electric FR-A520-0.4K Instruction Manual page 221

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