Technology of Electrical Automatic

Why Meter voltage display abnormal?

Blue Jay designed meter will record primary side and secondary side voltage value in register map. Most models show primary side value; some special request may show secondary side value.


If used in low-voltage application (less than 0.66KV), regular value range is 10-450V. Meter will default set [voltage range] parameter to “380”, and [VT ratio] to “1”.


If used in Medium- voltage or high-voltage application (Over 0.66KV), meter can external connect voltage transformer to expand the measurement range to 11KV or higher, depends on the VT specification.

For example, meter connect 110V/11KV transformer. meter will default set [voltage range] parameter to “110”, and [VT ratio] to “100”.


Above setting will be pre-set in our factory, except client have other request on this setting. During on-site installation, due to incorrect configuration operations by personnel, or incorrectly written parameters of the SCADA system, the [VT ratio] may set to 0 or other value, that will lead the meter show error display of voltage.


Do following step may help for troubleshooting:


  1. Terminals not tightened, please check terminal joint or re-wiring.
  2. Check setting of the [VT ratio], please refer user manual related chapter of Meter operation.
  3. Review SCADA or HMI coding, two see whether operate the [VT ratio] register.


If problem still not solved, can consider hardware failure, the general phenomenon is that a certain phase of the voltage shows “0”, rarely happen three-phase simultaneous errors. The possible reasons may be:


-. Hardware failure, it may be that the resistance of the voltage sampling circuit is burned

-. Open circuit caused by virtual welding


In this case, you can try to open the product shell, take a picture and send it to the after-sales support team for remote support. If the circuit board or components are burnt, that only way is return to the factory for repair.