Troubleshooting & repair, Input rectifier test – Lincoln Electric INVERTEC SVM101-B User Manual
Page 64
V300-I
TROUBLESHOOTING & REPAIR
TEST PROCEDURE
1. Perform
Input Filter Capacitor Discharge
Procedure as detailed in this section.
2. Locate Input Rectifier (Component D-13).
3. Locate leads needed to perform tests shown in
Figure F.11.
4. Use ohmmeter to perform tests shown in Table F.5.
Replace the Inpit Rectiferif readings are not as indi-
cated
NOTE: When installing a new Input Rectifier, torque
mounting nuts (in a cross tightening pattern) to 6
inch-pounds (.7 Nm). Torque terminals to 26 inch-
pounds (3 Nm). ALWAYS GO TO STEP 6 TO
CHECK RELATED COMPONENTS.
6. Inspect Main Power Switch S1 and replace if faulty.
Go to step 7.
7. Test Capacitors C1 and C2 and replace both
Capacitors if either is faulty.
NOTE: Faulty Capacitors could be the reason for a
defective Input Rectifier.
Visually inspect Capacitors for leakage, damage, etc.,
and use appropriate test equipment to determine com-
ponent integrity (also check/test Switch Boards for
damage).
F-34
F-34
INPUT RECTIFIER TEST
Test Points
Steps
+ Probe
– Probe
Acceptable Meter Reading
A
9
H1
Greater than 1K ohms
B
9
A
Greater than 1K ohms
C
9
H5
Greater than 1K ohms
D
H1
9
Less than 100 ohms
E
A
9
Less than 100 ohms
F
H5
9
Less than 100 ohms
G
12
H1
Less than 100 ohms
H
12
A
Less than 100 ohms
I
12
H5
Less than 100 ohms
J
H1
12
Greater than 1K ohms
K
A
12
Greater than 1K ohms
L
H5
12
Greater than 1K ohms
TABLE F.5
FIGURE F.11 - INPUT RECTIFIER LOCATION