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Chapter 8 Maintenance
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207
Table 8-3 Description of Main Circuit Electro Measurement
Item
Input(Power supply)
DC
Interme
diate
Link
Output
(
Motor
)
D0
term
inals
Vol
tage
Wave
form
Cur
rent
Measuring
instrument
Voltm
eter
Curre
nt
meter
Power
meter
DC
voltmete
r
Volt
meter
Curre
nt
meter
Power
meter
Volt
mete
r
Instrument
Type
Movin
g-coil
Electr
o-
Magn
etic
Electr
o-
dynam
ic
Magnet
o-
Electric
Rectifi
er
-type
Electr
o-
Magn
etic
Electr
o-
dynam
ic
Mag
neto-
Elect
ric
Parameter
Virtu
al
value
of
First
harm
onic
Total
virtua
l
value
Total
virtua
l
powe
r
DC
voltage
Virtu
al
value
of
First
harm
onic
Total
virtua
l
value
Total
virtua
l
value
of
powe
r
DC
volta
ge
When power supply is asymmetric seriously or three phases current is not balanced,
please use electro-dynamic type three-phase wattmeter to measure the power.
Because the product has passed electric insulation test and dielectric strength
examination, similar experiment is not required. In addition, the experiment will
decrease the insulating voltage proof and improper experiment may cause product failure.
If the experiment must be done, only skilled workers satisfy the qualification.
When doing experiment of main circuit voltage proof, please choose capacity equivalent
instrument, using time and leakage current of which can be set. Moreover, this
experiment will shorten life span of the device. Also, the main circuit terminals ( R, S, T,
U, V, W, P1, + ,-)must be short-circuited before using megohm-meter and the megohm
voltage level must match the system
(
220Vsystem/megohm-meter250V,380V
system/megohm-meter500V,660Vsystem/megohm-meter 1000V. Control circuit can’t
be measure by megohm-meter, but by universal meter (high resistance).
Earth-resistance of product (380V) should not be less than 5 M
Ω
and that of control
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