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F-50

TROUBLESHOOTING AND REPAIR

F-50

 

CAPACITOR BANK REMOVAL AND REPLACEMENT (continued)

 

FIGURE F.16 — LOCATION OF CAPACITOR BANK REMOVAL AND REPLACEMENT COMPONENTS.

LEAD

 

SCR DIODE #206

CAPACITOR

LEAD

BANK

 

LEAD

 

#206B

SHUNT

LEADS

X1 AND X2

POWER

ENHANCEMENT

CHOKE LEAD

OUTPUT

CHOKE LEAD

PROCEDURE

tive capacitor bank buss bar using a

 

1/2 in. open end wrench.

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See Figure F.16 for location of capacitor bank removal and replacement components.

1.Disconnect main input power to the machine.

2.Remove the case side panels using a 3/8 in. nutdriver.

3.Test that the capacitors are discharged using a volt ohmmeter. Polarity must be observed.

4.Remove the two transformer secondary leads X2 and X3 (braided copper strap) from the negative capacitor bank buss bar using two 1/2 in. open end wrench- es.

5.Remove the shunt, leads 206, 206B, and the SCR diode lead from the nega-

6.Remove the choke lead and lead 204B from the positive capacitor bank buss bar using two 1/2 in. open end wrench- es.

7.Remove the power factor enhancement choke lead from the positive capacitor buss bar using two 1/2 in. open end wrenches.

8.Remove the three nuts holding the capacitor bank to the floor of the machine using a 3/8 in. nut driver.

9.Clear the leads and carefully remove the capacitor bank assembly from the machine.

10.Reassemble the capacitor bank in the reverse order.

POWER MIG 255C

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Lincoln Electric SVM170-A service manual Capacitor Bank Removal and Replacement