As shown in figure "A" of the illustration, if in troubleshooting the control circuit using on-line techniques with a voltmeter with the start button depressed and the following readings are taken, what is the problem? "X1" to "X2" reads 115 VAC; "1" to "X2" reads 0 VAC; "2" to "X2" reads 0 VAC; and "3" to "X2" reads 0 VAC. EL-0123

Question

As shown in figure "A" of the illustration, if in troubleshooting the control circuit using on-line techniques with a voltmeter with the start button depressed and the following readings are taken, what is the problem? "X1" to "X2" reads 115 VAC; "1" to "X2" reads 0 VAC; "2" to "X2" reads 0 VAC; and "3" to "X2" reads 0 VAC.      EL-0123

Accepted Answer

Option B: the fuse is blown. A reading of 115 VAC at the transformer secondary (X1 to X2) confirms the transformer is functional. However, the absence of voltage at points 1, 2, and 3 indicates the circuit is interrupted immediately after the secondary output, which is characteristic of a blown fuse in the control power circuit.