MGI M4000E series, Instruction Manual

Page: 191 / 215

180
MAINTENANCE/INSPECTION
6.1.6 Daily and periodic inspection
Ar
ea 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
G
eneral
Surrounding
environment
Check ambient
temperature,
humidity, dust, dirt,
etc.
Refer to page 14.
Ambient
temperature:
-10°C to +40°C
(14°F to 104°F),
non-freezing.
Ambient
humidity: 90%
or less, non-
condensing.
Thermo-
meter,
hygrometer,
recorder
Overall unit Check for unusual
vibration and noise.
Visual and auditory
checks.
No fault.
Power
supply
voltage
Check that main
circuit voltage is
normal.
Measure voltage
across inverter
terminals R-S-T (L
1
-
L
2
-L
3
).
Within
permissible AC
(DC) voltage
fluctuation
(Refer to page
190)
Meter,
digital
multimeter
Ma
in
c
ir
cu
it
General
(1) Check with
megger (across
main circuit
terminals and
ground terminal).
(1) Disconnect all
cables from
inverter and
measure across
terminals R (L
1
),
S (L
2
), T (L
3
), U,
V, W and ground
terminal with
megger.
(2) Retighten.
(3) Visual check.
(1) 5M
Ω
or
more.
500VDC
class megger
(2) Check for loose
screws and bolts.
(2), (3) No fault.
(3) Check for
overheat on each
part.
(4) Clean.
Conductors,
cables
(1) Check conductors
for distortion.
(1), (2) Visual check. (1), (2) No
fault.
(2) Check cable
sheaths for
breakage.
Terminal
block
Check for damage. Visual check No fault
Inverter
module
Converter
module
Check resistance
across terminals.
Disconnect cables
from inverter and
measure across
terminals R, S, T-P,
N (L
1
, L
2
, L
3
- +, –),
and across U, V, W -
P (+), N (–) with a
meter with a 100 Ω
range.
Refer to page
182.
Analog meter
Smoothing
capacitor
(1) Check for liquid
leakage.
(1), (2) Visual check. (1), (2) No
fault.
Capacity
meter
(2) Check for safety
valve projection
and bulge.
(3) Measure
electrostatic
capacity.
(3) Measure with
capacity meter.
(3) 85% or
more of
rated
capacity.
M4500E.book 180 ページ ２００５年２月２２日 火曜日 午後５時７分