Instruction manual

180
MAINTENANCE/INSPECTION
6.1.6 Daily and periodic inspection
Area of
Inspection
Inspection
Item
Description
Interval
Method Criterion Instrument
Customer's
check
Daily
Periodic*
1 year
2 years
General
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-L3).
Within
permissible AC
(DC) voltage
fluctuation
(Refer to page
190)
Meter,
digital
multimeter
Main circuit
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 (L3), 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.

Te rm i na l
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, L2, L3 - +, –),
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