Yaskawa GPD503 Drive User Manual
Page 144
Appendix 4. DIODE AND TRANSISTOR MODULE RESISTANCE TEST
DIODE MODULE
Measure the resistance across the module terminals with a volt-ohm meter. Set the meter
at the X1 range. The measured resistance should be within the values listed in Table
A4-1.
RESISTANCE TEST FOR 3Ø CONVERTER MODULES (BRIDGE RECT)
VOM RESISTANCE SCALE RX1
+ IS THE POSITIVE POLARITY LEAD*
- IS THE NEGATIVE POLARITY LEAD
*THE VOM RED LEAD IS NOT NECESSARILY THE POSITIVE POTENTIAL IN THE RESISTANCE
MODE. FOR THESE TESTS THE + LEAD REFERS TO THE POSITIVE POTENTIAL. MAKE
SURE YOU KNOW WHICH POLARITY YOU HAVE ON YOUR VOM.
+
–
NORMAL
ABNORMAL
READING
READING
ON
ON
(OHMS)
(OHMS)
L1
P
L2
P
L3
P
10 to 50
0 or INFINITE
N
L1
N
L2
N
L3
+
–
NORMAL
ABNORMAL
READING
READING
ON
ON
(OHMS)
(OHMS)
+
–
NORMAL
ABNORMAL
READING
READING
ON
ON
(OHMS)
(OHMS)
L1
N
L2
N
L3
N
INFINITE
LESS THAN
P
L1
P
L2
P
L3
P
N
MAGNITUDE
0 or INFINITE
OF CAP
CHARGE TO
INFINITE
+
–
NORMAL
ABNORMAL
READING
READING
ON
ON
(OHMS)
(OHMS)
▲
▲
▲
▲
▲
▲
L1
L2
L3
P
N
●
●
●
●
●
●
●
●
●
Table A4-1. Diode Module Resistances
A4-1