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Mitsubishi Electric FR-E520 Instruction Manual Page 213

Transistorized inverter.
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Inspection
Description
Item
(1) Check for
chatter during
operation.
Relay
(2) Check for rough
surface on
contacts.
(1) Check balance
of output
voltages across
phases with
inverter operated
independently.
(2) Perform
Operation
sequence
check
protective
operation test to
make sure there
is no fault in
protective or
display circuits.
(1) Check for
unusual vibration
and noise.
Cooling fan
(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.
(2) Check for
General
unusual odor.
Check with megger
Insulation
(across terminals
and earth (ground)
resistance
terminal).
Note: The values within the parentheses are for the 400V class.
* For periodic inspection, contact you nearest Mitsubishi sales representative.
MAINTENANCE/INSPECTION
Interval
Periodic*
Method
$
(1) Auditory check. (1) No fault.
$
(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
overheat,
damage, etc.
$ Disconnect cables
from U, V, W,
including motor
cables.
203
Criterion
Instrument
(2) No fault.
(1) Phase-to-
phase
voltage
balance
within 4V
(8V) for
Digital
200V
multimeter,
(400V).
rectifier type
voltmeter
(2) Fault must
occur
because of
sequence.
No unusual
vibration and
unusual noise.
(1) Check that
lamps are
lit.
Must satisfy
Voltmeter,
ammeter,
specified and
etc.
management
values.
(1), (2) No
fault.
5MΩ or more. 500V
megger
6

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