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152
3
Interval
Periodic*
Area of
Inspection
Inspection
Item
Description
Daily
1 year
2 years
Method Criterion Instrument
Control circuit
Protective circuit
Operation
check
(1) Check
balance of
output
voltages
across
phases with
inverter
operated
independentl
y
.
(2) Perform
sequence
protective
operation
test to make
sure there is
no fault in
protective or
display
circuits.
(1) Measure
voltage
across
inverter
output
terminals U-
V-W.
(2) Simulate
connection of
inverter
protective
circuit output
terminals.
(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 and
unusual noise.
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.
Display
Meter
Check that
reading is
normal.
Check reading of
meters on panel.
Must satisfy
specified and
management
values.
Voltmeter,
ammeter,
etc.
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
overheat,
damage, etc.
(1), (2) No fault.
Motor
Insulation
resistance
(1) Check with
megger
(across
terminals
and ground
terminal).
(1) Disconnect
cables from
U, V, W
(including
motor cables).
5M
Ω
or more. 500V
megger
Note: The value for the 400V class is indicated in the parentheses.
* For periodic inspection, contact you nearest Mitsubishi sales representative.