Miller DYNASTY DX, Technical Manual

Page: 19 / 80

TM-357 Page 17 Dynasty DX
Best Test For PM3 And PM4 (Use
MILLER IGBT tester #043553)
(Continued)
Y
Read and follow safety
information in Section 5-1
before proceeding.
1 Visually inspect PM3 and
PM4 for damage.
2 Disconnect gate lead plug
PLG7 from receptacle RC7 on
control board PC1.
.
Make sure meter probes make
good electrical contact. Black
paint on bolts may act as an in-
sulator.
Test PM3 as follows:
3 Connect red tester lead to C1,
black tester lead to E1, and
yellow tester lead to gate
(PLG7–pin 12). Next, connect
red lead to C2, black lead to
E2, and yellow tester lead to
gate (PLG7–pin 3).
Test PM4 as follows:
4 Connect red tester lead to C1,
black lead to E1, and yellow
lead to gate (PLG7– pin 6).
Next, connect red lead to C2,
black lead to E2, and yellow
lead to gate (PLG7– pin 9).
Connect PLG7 to RC7.
Alternate Test For PM3 And PM4
(Use standard digital meter set to
ohms position) (Continued)
Y
Read and follow safety
information in Section 5-1
before proceeding.
1 Visually inspect PM3 and
PM4 for damage.
2 Disconnect gate lead plug
PLG7 from receptacle RC7 on
control board PC1.
.
Make sure meter probes make
good electrical contact. Black
paint on bolts may act as an in-
sulator.
3 For PM3 and PM4, measure
between C1 and E1, and then
between C2 and E2 (a high
resistance means device is
okay, zero ohms means
device is shorted)
4 For PM3, check for 100K
ohms resistance (+/– 10%)
between the following:
E1 and PLG7–pin 12
E2 and PLG7–pin 3
5 For PM4, check for 100K
ohms resistance (+/– 10%)
between the following:
E1 and PLG7–pin 6
E2 and PLG7–pin 9
Connect PLG7 to RC7.
Receptacle
RC7
Terminal
C2/E1
Terminal
E2
Terminal
C1
Terminal
C2/E1
Terminal
E2
Terminal
C1
Front Of Unit
Control Board PC1
ST-802 037 / ST-802 408 / SA-188 731-A
1
12
7
PLG7
Tab Lock
Bottom View
6