Troubleshooting & repair – Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B User Manual
Page 109
POWER WAVE 450
F-49
F-49
INPUT RECTIFIER RESISTANCE TEST
(continued)
TROUBLESHOOTING & REPAIR
9. Check all leads connected to the input
rectifier. Check for looseness or shorted
wires.
10. Using an analog type meter, perform the
resistance test Steps A through L accord-
ing to the Table F.1.
NOTE: If terminals AC1, AC2, and AC3 of
the input rectifier are not easily
accessible, use terminals T1, T2,
and T3, respectively, of main con-
tactor CR1 for the resistance mea-
surements. Similarly, if terminals
POS and NEG of the input rectifier
are not easily accessible, use ter-
minals POS and NEG of the recon-
nect switch for the resistance mea-
surements.
11. After the test is completed and the prob-
lem successfully repaired, reconnect the
negative leads to the reconnect switch.
Fasten the reconnect switch assembly
back into position on the machine.
NOTE: If input rectifier was shorted, other
components may be faulty.
Perform Field Effect Transistor/
Switch Board Test and check for
“leaky” or “shorted” capacitors.
12. Install the machine case sides and top.
13. Install the handle and the lift bail rubber
gasket.
TABLE F.1 – INPUT RECTIFIER RESISTANCE VALUES
Step
Place
Place
(See
+ Lead
- Lead
Note)
Test for
on . . .
on . . .
If . . .
Then . . .
A
1K Ohms
POS
AC1
>1K Ohms
Go to step B.
<100 Ohms
Tested failed.
B
1K Ohms
POS
AC2
>1K Ohms
Go to step C.
<100 Ohms
Tested failed.
C
1K Ohms
POS
AC3
>1K Ohms
Go to step D.
<100 Ohms
Tested failed.
D
1K Ohms
AC1
NEG
>1K Ohms
Go to step E.
<100 Ohms
Tested failed.
E
1K Ohms
AC2
NEG
>1K Ohms
Go to step F.
<100 Ohms
Tested failed.
F
1K Ohms
AC3
NEG
>1K Ohms
Go to step G.
<100 Ohms
Tested failed.
G
<100 Ohms
AC1
POS
<100 Ohms
Go to step H.
>1K Ohms
Test failed.
H
<100 Ohms
AC2
POS
<100 Ohms
Go to step I.
>1K Ohms
Test failed.
I
<100 Ohms
AC3
POS
<100 Ohms
Go to step J.
>1K Ohms
Test failed.
J
<100 Ohms
NEG
AC1
<100 Ohms
Go to step K.
>1K Ohms
Test failed.
K
<100 Ohms
NEG
AC2
<100 Ohms
Go to step L.
>1K Ohms
Test failed.
L
<100 Ohms
NEG
AC3
<100 Ohms
Input Rectifier OK
>1K Ohms
Test failed.