Chapter 7 Checking and Troubleshooting
7-16
Ar
ea
Ch
ec
ki
ng
po
in
ts
Description
How to Check
Judgment Criterion
In
st
ru
m
en
t
In
di
ca
to
r
M
et
er
Is the indicator value
normal?
Check the indicator
value on the display of
the panel surface.
Check the value under
the regulation and
standard value
Vo
lt M
et
er
/
C
ur
re
nt
M
et
er
, e
tc
.
(4) Regular Checking (2 year interval)
Ar
ea
Ch
ec
ki
ng
po
in
ts
Description
How to Check
Judgment Criterion
In
st
ru
m
en
t
M
ai
n
cir
cu
it
En
tir
e
sy
st
em
Megger Checking
(between the main
circuit terminal and the
ground terminal
Unfasten the
connection of the
inverter, and then
measure the gap
among R, S, T, U, V,
and W terminals and
this area after having
them shorted out.
5MΩ or more
D
C
5
00
V
C
la
ss
M
eg
ge
r
M
ot
or
R
es
ist
an
ce
In
su
la
tio
n Megger checking
(between the output
terminal and the
ground terminal)
Unfasten the
connection among U,
V, and W, and then
bind the motor wiring.
5MΩ or more
50
0V
C
la
ss
M
eg
ge
r
Caution
Avoid direct rays of light or a warm and humid place.
Install the inverter in a closed panel or clean place free from foreign substances such as
oil mist and fiber dust.
In order to meet the EMC standard, 200V 30~75kW and more than 90kW product should
be installed inside a metal cabinet or panel.
