MGI M4000E series, Instruction Manual

Page: 192 / 215

181
6
MAINTENANCE/INSPECTION
Ma
in
ci
rc
u
it
Relay
(1) Check for
chatter during
operation.
(1) Auditory check. (1) No fault.
(2) Check for rough
surface on
contacts.
(2) Visual check. (2) No fault.
Cont
rol
c
ir
cui
t
P
rot
ec
tiv
e
c
irc
ui
t
Operation
check
(1) Check balance
of output
voltages across
phases with
inverter operated
independently.
(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.
(1) Phase-to-
phase
voltage
balance
within 12V.
Digital
multimeter,
rectifier type
voltmeter
(2) Simulate
connection of
inverter
protective
circuit output
terminals.
(2) Fault must
occur
because of
sequence.
Cool
in
g
syst
e
m
Cooling fan
(1) Check for
unusual vibration
and noise.
(1) Turn by hand
with power off.
No unusual
vibration and
unusual noise.
(2) Check for loose
connection.
(2) Visual check.
Di
spl
a
y
Display
(1) Check for LED
lamp blown.
(1) Lamps indicate
indicator lamps
on panel.
(1) Check that
lamps are
lit.
(2) Clean. (2) Clean with rag.
Meter
Check that reading
is normal.
Check reading of
meters on panel.
Must satisfy
specified and
management
values. Voltmeter,
ammeter,
etc.
Mo
to
r
General
(1) Check for
unusual vibration
and noise.
(1) Auditory,
sensory, visual
checks.
(1), (2) No
fault.
(2) Check for
unusual odor.
(2) Check for
unusual odor
due to
overheat,
damage, etc.
Insulation
resistance
Check with megger
(across terminals
and ground
terminal).
Disconnect cables
from U, V, W,
including motor
cables.
5M
Ω
or more. 500V
megger
A
rea o
f
In
sp
ecti
o
n
Inspection
Item
Description
Interval
Method Criterion Instrument
Cu
sto
m
er
's
ch
eck
Dai
ly
Periodic*
1 ye
ar
2 years
M4500E.book 181 ページ ２００５年２月２２日 火曜日 午後５時７分