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F-15

F-15

TROUBLESHOOTING & REPAIR

MAIN TRANSFORMER TEST (continued)

FIGURE F.2 – MAIN TRANSFORMER TEST POINT LOCATIONS

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H5 H2 H3 H4

H1

(SHOWN CONNECTED

FOR 230V)

L1L2

RECONNECT PANEL

W

B

G

L1

L2

 

LINE

 

SWITCH

H1

H4

H1

H1

H4

LOCATED ON FRONT

OF MACHINE'S BASE

MAIN

TRANSFORMER

H1

 

 

 

 

 

 

 

 

 

 

LOCATED ON

 

 

 

 

 

 

 

MACHINE'S BASE

 

 

 

 

 

 

 

(STORAGE

 

 

 

 

 

 

 

COMPARTMENT SIDE)

 

 

 

 

 

 

 

OUTPUT

LOCATED NEXT TO

H2

 

 

RECTIFIER

 

 

MAIN TRANSFORMER

 

 

 

 

 

 

 

 

(ON WIRE DRIVE SIDE)

H5

 

X1

 

 

 

 

 

 

 

+

 

2520

 

 

 

 

 

 

 

 

 

 

 

 

H3

 

57 VAC

 

80 VDC

s

 

+

 

 

h a

 

 

 

 

o

 

 

 

 

 

 

 

m t

 

 

 

 

 

 

 

s

R1

 

 

 

 

 

0 w

 

 

 

 

 

 

t

 

 

 

 

 

 

0

0

 

 

 

 

 

 

5

5

2400/100

 

 

 

-

 

 

 

H4

 

 

 

2530

 

 

X2

 

 

 

115 VAC 30 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOCATED ON

 

 

 

 

 

 

 

CHOPPER BOARD

 

X5 X6

 

 

 

 

 

ASSEMBLY

X3

X4

 

 

 

 

 

 

 

 

CONTROL RECTIFIER

 

 

 

 

 

 

 

+

 

 

 

 

 

 

-

LOCATED ON

 

 

 

 

 

TRANSFORMER

 

 

 

 

 

 

 

 

 

BAFFLE

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PROCEDURE

WARNING

The ON/OFF POWER SWITCH will be "hot" during these tests.

NOTE: Secondary voltages will vary proportionately with the primary input voltage.

1.Disconnect the main input power supply to the machine.

2.Perform the Case Cover Removal procedure.

3.Remove the tool tray with a 5/16 in. nut-driver (3 screws).

TEST INPUT VOLTAGE TO THE MAIN TRANS- FORMER PRIMARY WINDING:

4.Confirm the reconnect panel is connected properly for the correct voltage. See reconnect panel con- nection diagram located on back of machine above reconnect door.

5.Test for correct input voltage between L1 lead at the LINE SWITCH to L2. Voltage tested will vary depending on the input voltage connection. See Wiring diagram for test point locations.

*If the voltage is incorrect, check for loose or broken leads between the reconnect panel and the ON/OFF POWER SWITCH. Also, test the ON/OFF POWER SWITCH for proper operation.

*If the voltage is correct, check for the same voltage at H1 and H4 and at the bottom of the LINE SWITCH with the switch in the ON position.

*If the voltage is incorrect, check for loose or broken leads between the reconnect panel and the LINE SWITCH.

*If the correct voltage is being applied to the main transformer primary winding, proceed to the table below for the secondary winding output voltage tests.

Leads

Description

Expected Voltage

 

 

 

X1-X2

Power to output

57 VAC

rectifier

 

 

X3-X4

Power to fan motor

115 VAC

 

 

 

X5-X6

Power to control

30 VAC

rectifier

 

 

If the correct voltage is being applied to the main transformer and one or more of the secondary volt- ages is missing or incorrect, the main transformer may be faulty. Replace the main transformer.

POWER MIG 300

Page 59
Image 59
Lincoln Electric SVM160-B service manual Main Transformer Test, Rectifier

SVM160-B specifications

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