Reference - YASKAWA VS-505WII Manual

(REFERENCE)
ROUGH CHECK OF THYRISTORS
Where thyristors normally function, the following
values are obtained .
More than several hundreds of kiloohms across
Several ohms to several hundreds of ohms across
(A) and (K) . (G) and (K) .
IPA
RPA
1 6
FS
FT
(a)
Resistance across thyristor
(b) Resistance across thyristor
terminals (A) and (K)
terminals (G) and (K)
ELEMENTARY DIAGRAM OF THYRISTOR CONVERTER UNIT
(TYPE CDMR-W II, 230V, 90A)
P15
RT=4-p 18
P19, P20
1PCB
G1
K1
K2
G2
G1
K1
N3,4
Y1,
Y5
I
R1
Il R .)
JPDC-P05()
FPA~ ,
RPA i
G1
Thyristor fails
i f 0 or - is in-
dicated on the
even either
tester (x 1 0
range)
Fig . 25 Rough Check of Thyristors
AC POWER SUPPLY
200/220V 50/60Hz
----------- ~----------
Fig . 26 Main Circuit
500
W1
500
Thyristor fails
if 0 or - is in-
dicated on the
even either
tester (x 1 S2
ran ge )
CONTROLLER
JPDC-CO41
R
1PCB