Hitachi SJ Series, User Manual

Page: 647 / 786

19-5
Chapter 19
Maintenance and Inspection
19.6 Checking Method of Inverter and
Converter.
・
Using a tester, you can check the condition of
inverter and converter if it is good or bad.
(preparation)
(i) Remove the power lines connected from an
external source (R, S, T), wires connecting to the
motor (U, V, W), and regenerative braking resistor
(P, RB).
(ii)
Prepare a tester. (The range used is 1Ω
resistance measurement range.)
(Checking method) *1)
・
You can determine the good-or-bad condition of
conduction status of terminals on the inverter main
circuit terminal block R, S, T, U, V, W, RB, P, and N
by alternately changing the polarity of tester for
measurement.
Tester polarity
Measured
value *2) (Red) (Black)
C
o
n
v
e
rt
e
r
D1
R PD Non-conductive
PD R Conductive
D2
S PD Non-conductive
PD S Conductive
D3
T PD Non-conductive
PD T Conductive
D4
R N Conductive
N R Non-conductive
D5
S N Conductive
N S Non-conductive
D6
T N Conductive
N T Non-conductive
In
v
e
rt
e
r
TR1
U P Non-conductive
P U Conductive
TR2
V P Non-conductive
P V Conductive
TR3
W P Non-conductive
P W Conductive
TR4
U N Conductive
N U Non-conductive
TR5
V N Conductive
N V Non-conductive
TR6
W N Conductive
N W Non-conductive
BRD TR7
RB P Non-conductive
P RB Conductive
RB N Non-conductive
N RB Non-conductive
*1) By measuring the voltage between P and N in the DC
voltage range, check that electricity is fully discharged
from the smoothing capacitor before performing check.
*2) When electricity is not conducted, a nearly infinite
value is demonstrated.
Due to effects of the smoothing
capacitor, electricity may be conducted instantly, not
showing an infinite value. When electricity is conducted,
a numeric value range will be indicated from some to
dozens in a unit of
Ω. The values vary depending on
the element type, tester, type, etc. However, it is
acceptable if numeric values obtained for each item
are nearly the same. The measured value may be
varied some degree in
Ω by the reason of the
preventing inrush current of current limiting resistor.
*3) The braking circuit (BRD) section is equipped as
standard on the following models: P1-00044-L -
P1-01240-L (P1-004L~P1-220L) and P1-00041-H -
P1-00930-H (P1-007H~P1-370H)
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
Braking resistor circuit (BRD) *3)
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
Braking resistor circuit (BRD) *3)
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) - 02950-L (550L)
400V class: 00400-H (150H) - 03160-H (1320H)