Summary
My energy meter does not turn on
- Check that your energy meter is properly wired
- Verify that the auxiliary power supply is correctly connected (if required, depending on the meter model)
Indeed, this power supply is required to power the display on certain energy meter models such as the EM3333TCRS or the EM35TCPURS in the three-phase version (see page 134). This 230 Vac supply must be connected to terminals 5 and 6 of the meter. It is possible to loop from terminals 7 and 8 to the auxiliary power supply of another meter.
The solution
Once the auxiliary power supply is connected, the backlight of your energy meter will turn on.
My consumption fluctuates up or down
Check the data on your meter, there is likely a reading error.
Indeed, you need to read the consumption on both digit lines of the display.
For example, the consumption on the meter below is 9,031.4 kWh.
The solution
By reading both lines of the display, the values naturally become consistent.
I have one or more phases showing negative (active power)
- Check the wiring of your current transformers, there is likely an error or a reversal.
The current transformer (CT) must be installed so that the current flows from P1 to P2 (from the source to the load). If the CT is installed backward, your meter will display negative values (active power).
Tip: t is not necessary to rewire your installation; you simply need to swap the cables between S1 and S2.
the solution
After modifying the wiring, the values return to positive.
My consumption seems low or excessive
First, check the CT ratio, if it is a CT-based meter, there is likely an incorrect value programmed in the meter. Check the meter parameters in the “Ct rATE” menu.
The displayed value must match the CT ratio. For example, for a 100/5 A CT, you should enter 20.
Warning
On MID-certified meters, it is not possible to modify this value.
The current readings are inconsistent
Check the wiring of your split-core CTs or Rogowski coils connected to your meter at 333 mV. It is imperative to connect the S2 terminals of the CTs to ground.
If this is not done, the values displayed by the meter may be inconsistent.
The solution
Connect the S2 terminals of your CTs to ground, and the values will become consistent.