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Inspection
Description
Item
(1) Check for chatter
during operation.
(2) Check for rough
Relay
surface on
contacts.
(1) Check balance of
output voltages
across phases with
inverter operated
independently.
Operation
(2) Perform sequence
check
protective
operation test to
make sure there is
no fault in
protective or
display circuits.
(1) Check for unusual
vibration and
Cooling fan
noise.
(2) Check for loose
connection.
(1) Check for LED
lamp blown.
Display
(2) Clean.
Check that reading is
normal.
Meter
(1) Check for unusual
vibration and
noise.
General
(2) Check for unusual
odor.
Check with megger
Insulation
(across terminals and
resistance
ground terminal).
Note: The values within the parentheses are for the 400V class.
* For periodic inspection, contact you nearest Mitsubishi sales representative.
PROTECTIVE FUNCTIONS
Interval
Periodic*
Method
(
(1) Auditory check.
(
(2) Visual check.
(
(1) Measure voltage
across inverter
output terminals
U-V-W.
(
(2) Simulate
connection of
inverter
protective circuit
output terminals.
(
(1) Turn by hand
with power off.
(
(2) Visual check.
(
(1) Lamps indicate
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 overheats,
damage, etc.
( Disconnect cables
from U, V, W,
including motor
cables.
181
Criterion
Instrument
(1) No fault.
(2) No fault.
(1) Phase-to-
phase
voltage
balance
Digital
within 4V
multimeter,
(8V) for
rectifier
200V (400V).
type
(2) Fault must
voltmeter
occur
because of
sequence.
No unusual
vibration and
unusual noise.
(1) Check that
lamps are lit.
Must satisfy
Voltmeter,
specified and
ammeter,
management
etc.
values.
(1), (2) No fault.
5M Ω or more.
500V
megger
5
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