Diode And Igbt (Transistor) Module Resistance Test - Veikong gpd 515/g5 Startup Manual

6 . 5 D I O D E A N D IGBT (TRANSISTOR) MODULE RESISTANCE TEST
A . 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 6-4.
NOTE: If the DC bus fuse is blown (PUF), the values shown below may not be accurate.
Power should be removed from L1, L2, & L3 and the CHARGE light
should be out prior to conducting these tests.
+ – NORMAL
+ – NORMAL
READING
READING
ON ON (OHMS)
ON ON (OHMS)
L1 + 1
L2 + 1
2.5 to 50 Ω
L3 + 1
– L1
– L2 0.25 to 0.7
– L3 if using
RESISTANCE TEST FOR 3Ø CONVERTER MODULES (BRIDGE RECT)
L 1
L 2
L 3
* 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.
WARNING
Table 6-4. Diode Module Resistances
ABNORMAL
ABNORMAL
READING
READING
(OHMS)
(OHMS)
0 Ω
or or INFINITE
scale
G G
L L L
G
G
G
L L L
G G
VOM RESISTANCE SCALE R x 1
+ IS THE POSITIVE POLARITY LEAD *
– IS THE NEGATIVE POLARITY LEAD
+ – NORMAL
+ – NORMAL
READING
READING
ON ON (OHMS)
ON ON (OHMS)
L1 –
L2 –
L3 – INFINITE
+ 2 L1
+ 2 L2
+ 2 L3
+ 2 – MAGNITUDE
OF CAP
CHARGE TO
INFINITE
6-27
ABNORMAL
ABNORMAL
READING
READING
(OHMS)
(OHMS)
LESS
THAN
1M Ω
0 Ω
or INFINITE
+ 2 or + 1
–