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Troubleshooting and repair, Output rectifier test procedure (continued), Procedure – Lincoln Electric INVERTEC SVM199-A User Manual

Page 92

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OUTPUT

OUTPUT

MPS

MPS

AA

OLTS

OLTS

VV

REMOTE

REMOTE

LOCAL

LOCAL

CONTROL

CONTROL

SELECT

SELECT

SOFT

CRIP
HI-FREQ

TIG

TOUCH

START

TIG

POSITIVE (+)

OUTPUT

TERMINAL

NEGATIVE (-)

OUTPUT

TERMINAL

OUTPUT

OUTPUT

MPS

MPS

A

A

OLTS

OLTS

V

V

REMOTE

REMOTE

LOCAL

LOCAL

CONTROL

CONTROL

SELECT

SELECT

SOFT

CRIP

HI-FREQ
TIG

TOUCH
START
TIG

POSITIVE (+)
OUTPUT
TERMINAL

NEGATIVE (-)
OUTPUT
TERMINAL

FIGURE F.13 - OUTPUT TERMINAL LOCATION

OUTPUT RECTIFIER TEST PROCEDURE (continued)

PROCEDURE

1. Remove main input supply power to the V450-

PRO.

2. Remove any output load that may be connect-

ed to the V450-PRO.

3. With the analog ohmmeter, measure the resis-

tance between the positive and negative output
terminals. Refer to Figure F.13.

Important: The positive (+) meter probe must be
attached to the positive output terminal and the
negative (-) meter probe must be attached to the
negative output terminal.

4. If the reading is approx. 50 ohms, the output

rectifier modules are not shorted. If the reading
is less than 10 ohms, one or more of the rectifi-
er modules may be shorted. Reverse meter
probe and verify low reading.

5. Remove the case top perform the Input Filter

Capacitor Discharge procedure.

6. Using the 5/16” wrench, remove and insulate

lead 202A from the negative output terminal.
Repeat step 4 to confirm if it is less than 10
ohms short.

7. Reconnect lead 202A to the negative output ter-

minal.

8. Replace the shorted modules if necessary.

TROUBLESHOOTING AND REPAIR

F-52

F-52

INVERTEC® V450-PRO

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