Miller DYNASTY DX, Technical Manual

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TM-357 Page 16 Dynasty DX
5-5. IGBT Modules PM1, PM2, PM3, PM4
Best Test For PM1 And PM2 (Use MILLER
IGBT tester #043553)
Y
Read and follow safety information in
Section 5-1 before proceeding.
.
It is not necessary to remove interconnect-
ing board PC2 to test the IGBT’s unless in-
put capacitor C3 or C4 is shorted.
1 Disconnect gate lead plug PLG5 from
receptacle RC5 on control board PC1.
Test PM1 as follows:
2 Connect red tester lead to C1, black tester
lead to E1, and yellow tester lead to gate
(PLG5–pin 10). Next, connect red lead to
C2, black lead to E2, and yellow tester
lead to gate (PLG5–pin 7).
Test PM2 as follows:
3 Connect red tester lead to C1, black lead
to E1, and yellow lead to gate (PLG5– pin
6). Next, connect red lead to C2, black
lead to E2, and yellow lead to gate
(PLG5–pin 9).
Connect PLG5 to RC5.
If IGBT’s 1 or 2 are defective, check D1, D2, D3,
and D4 on PC2 (see Section 5-6). Also check
W1 and W2 in 230/460 volt models (see Section
5-7).
Proceed to top of next page to test PM3 and
PM4.
Alternate Test For PM1 And PM2 (Use stan-
dard digital meter set to ohms position)
Y
Read and follow safety information in
Section 5-1 before
proceeding.
.
It is not necessary to remove interconnect-
ing board PC2 to test the IGBT’s unless in-
put capacitor C3 or C4 is shorted.
1 Disconnect gate lead plug PLG5 from
receptacle RC5 on control board PC1.
2 For PM1 and PM2, measure between C1
and E1, and then between C2 and E2 (a
high resistance means device is okay,
zero ohms means device is shorted)
3 For PM1, check for 100K ohms resistance
(+/– 10%) between the following:
E1 and PLG5–pin 10
E2 and PLG5–pin 7
4 For PM2, check for 100K ohms resistance
(+/– 10%) between the following:
E1 and PLG5–pin 6
E2 and PLG5–pin 9
Connect PLG5 to–RC5.
If IGBT’s 1 or 2 are defective, check D1, D2, D3,
and D4 on PC2 (see Section 5-6). Also check
W1 and W2 in 230/460 volt models (see Section
5-7).
Proceed to bottom of next page to test PM3 and
PM4.
Control Board PC1
Receptacle
RC5
Terminal
C1
Terminal
E2
Terminal
C2/E1
IGBT Module PM1 Or PM2
Rear Of Unit
ST-802 275 / Ref. SD-183 484 / SA-188 731-A
6
12
PLG5
Tab Lock
Bottom View
15
10
6