6-4
Chapter 6
Inspection and maintenance
6.5 Checking method for
inverter/converter
・
Using the multimeter, you can check if the inverter or
converter unit are defective or non-defective.
(Preparation)
①
Remove the supply (R,S,T) and motor wiring (U,V,W), and
also the regenerative braking resistor(P,RB).
②
Prepare the multimeter. (Application measurement range
is 1Ω)
(Checking method)
・
Measure and check the current conduction at each of the
inverter main circuit terminals R, S, T, U, V, W, RB, P, N, by
changing the polarity of the multimeter alternately.
Multimeter polarity
Measured result
(Red)
(Black)
Co
nv
er
te
r c
irc
ui
t
D1
R
PD
No conduction
PD
R
Conduction
D2
S
PD
No conduction
PD
S
Conduction
D3
T
PD
No conduction
PD
T
Conduction
D4
R
N
Conduction
N
R
No conduction
D5
S
N
Conduction
N
S
No conduction
D6
T
N
Conduction
N
T
No conduction
In
ve
rt
er
c
irc
ui
t
TR1
U
P
No conduction
P
U
Conduction
TR2
V
P
No conduction
P
V
Conduction
TR3
W
P
No conduction
P
W
Conduction
TR4
U
N
Conduction
N
U
No conduction
TR5
V
N
Conduction
N
V
No conduction
TR6
W
N
Conduction
N
W
No conduction
BR
D
p
ar
t
TR7
RB
P
No conduction
P
RB
Conduction
RB
N
No conduction
N
RB
No conduction
*1) Before checking the circuits, measure the voltage across
terminals P and N with the multimeter in DC voltage range
mode to confirm that the smoothing capacitor has been fully
discharged.
*2) When not conducting, it shows an infinite value. Due to the
influence of the smoothing capacitor, it may show
momentarily any other value other than infinite. When
conducting, indicates a value around several tens of ohms Ω.
The measurements with different multimeters may not match
exactly, but as long the values are close between them, it is
acceptable.
*3) The chopper braking circuit is built-in in the models below:
P1-00044L
~
P1-01240L(ND004L
~
ND220L)
P1-00041H
~
P1-00620H(ND007H
~
ND220H)
Model(P1-*****-*)
200V class : 00044-L(004L)
~
00600-L(110L)
400V class : 00041-H(007H)
~
00310-H(110H)
Model(P1-*****-*)
200V class : 00800-L(150L)
~
04300-L(900L)
400V class : 00400-H(150H)
~
03160-H(1320H)
Converter
Inverter
PD
D1
D4
D2
D5
D3
D6
R
S
T
TR4
TR5
TR6
TR1
TR2
TR3
C
+
P
N
TR7
RB
U
V
W
Chopper Brake
Converter
Inverter
PD
D1
D4
D2
D5
D3
D6
R
S
T
TR4
TR5
TR6
TR1
TR2
TR3
C
+
P
N
TR7
RB
U
V
W
Chopper Brake
Summary of Contents for P1-00041HFEF
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