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. |