Circuits - Hitachi P1-00080-L Basic Manual

Chapter 6
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
(Red) (Black)
R PD
D1
PD R
S PD
D2
PD S
T PD
D3
PD T
R N
D4
N R
S N
D5
N S
T N
D6
N T
U P
TR1
P U
V P
TR2
P V
W P
TR3
P W
U N
TR4
N U
V N
TR5
N V
W N
TR6
N W
RB P
P RB
TR7
RB N
N RB
Measured result
No conduction
Conduction
No conduction
Conduction
No conduction
Conduction
Conduction
No conduction
D1
Conduction
No conduction
R
Conduction
No conduction
S
No conduction
Conduction
T
No conduction
Conduction
No conduction
D4
Conduction
Conduction
No conduction
Conduction
No conduction
Conduction
No conduction
No conduction
Conduction
No conduction
No conduction
D1
R
S
T
D4
6-4
Inspection and maintenance
*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)
Chopper Brake
PD P RB
Converter
D2 D3
C +
TR7
D5 D6
N
Model(P1-*****-*)
200V class : 00800-L(150L)～04300-L(900L)
400V class : 00400-H(150H)～03160-H(1320H)
Chopper Brake
PD P RB
Converter
D2 D3
C +
TR7
D5 D6
N
Inverter
TR1 TR2 TR3
U
V
W
TR4 TR5 TR6
Inverter
TR1 TR2 TR3
U
V
W
TR4 TR5 TR6