Lincoln Electric DC-655 service manual High Voltage is present at

Section TOC

Master TOC

F-29 F-29

TROUBLESHOOTING & REPAIR

CONTROL TRANSFORMER (T2) TEST (continued)

Return to

Return to Section TOC

Return to Section TOC

Return to

Return to Master TOC

Return to Master TOC

5.Locate the control transformer secondary leads. See Figure F.10. Lead X1 is con- nected to the coil terminal on the CR1 input contactor. Lead X2 is spliced into lead #211, which is then connected to the input power switch (SW1).

WARNING

HIGH VOLTAGE is present at

the input leads.

6.Apply the correct three-phase input power to the DC-655 and check for 115 VAC at leads X1 to X2.

NOTE: The DC-655 does not have to be ON to perform this test. If the main AC input supply voltage varies, the control trans- former secondary voltage will vary by the same percentage.

7.If approximately 115 VAC is present at leads X1 to X2, the control transformer is function- ing properly.

8.If approximately 115 VAC is NOT present at leads X1 to X2, make certain the correct input voltage is being applied to the primary winding of the control transformer and that the correct primary leads (H1, H2, H3, etc.) are being used. See the connection infor- mation diagram on the input access door.

9.If the correct voltage is being applied to the primary of the control transformer and the secondary voltage is incorrect or not pre- sent, the control transformer may be defec- tive.

Return to Section TOC

Return to Master TOC

IDEALARC DC-655