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Secondary Voltage is Too Low

Transformer secondary voltage can be too high, too low or there may be no voltage. Please note that transformer voltage is a ratio of the primary voltage. If the primary voltage is too high or too low, the secondary voltage will also be too high or too low.

Check: Solution:
Verify the taps are set up the same or set up incorrectly for the incoming voltage. Set up taps at the same level and for the correct primary voltage.
The voltage exceeds the ability of the taps to tune the voltage. A different transformer with a larger tap range or higher input voltage may be needed. Adjust the input voltage to be within the range of the transformer taps.
The transformer is wired correctly per the input voltage. Verify the transformer being installed is the correct voltage for the application. If the nameplate matches the application, the transformer may be incorrectly nameplated.
Verify the neutral connection is properly wired and grounded per the applicable codes. All three coils should be attached to a common neutral point. If the transformer neutral is damaged, it will have to repaired. Wire and ground the neutral per applicable codes. A coil may have been inverted during manufacturing and would have to be replaced.
The transformer is wired correctly per the input voltage. The transformer may be wired in reverse.
Check the power factor. If the power factor is above 1.0 (leading), high voltages will result. This must be corrected at a systems level.
Verify the coils are look similar and have similar resistance values. The turns ratio may have been incorrectly wound or one or more of the coils may be incorrect in comparison to the other coils.

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