3 Phase Eastron Meter with 3 Phase Inverter

The External Meter we will use for our 3 Phase inverters will be the Eastron SDM630MCT. Please see the overview wiring diagram below. please note this guide is based on the eastron CT clamp version. one of the versions is known as SDM630MCT.MBV2

Step 1 – Connect Power to Eastron

As per diagram, you’ll need to double up the Neutral to NA, and also double up L1 to LA to power on the Eastron meter.

Step 2 – Connect CT clamps

On the Live tails from the incoming supply between the Meter and the Consumer Board – please clamp on the CT clamps on the Live tails for the relative Legs. The Ct clamp has an arrow that MUST face the Consumer unit.

Once CT clamps connected, please connect each end accordingly.

As you can see, we have extended the CT clamps using CAT 5 cable and doubled up the wires. We have confirmation from Eastron themselves that we can extend the CT clamps. 5A CT cables can be extended up to 1-2 meters, MA CT cables can be extended up to 5 meters, before you start to get slight inaccuracies with the readings.

Step 3 – Cable from Eastron to Inverter

Using one end of the data cable CAT 5/CAT 6 – Choose which coloured cable to connect into TX+A and choose another and connect to TX-B.

Using the other end of the data cable CAT 5/CAT 6 – Create connections on Inverter side, please see pin out connections in the diagram below. Pin 1 = 485-B and Pin 2 = 485-A and plug RJ45 into Meter/RS485 Port. (Note, as of March 2024 these are the correct pins. Please revert to your manual on the latest pin configuration.)

Step 4 – Settings on the Eastron

When setting up the unit, some screens require the entering of a number. On entry to the setting up section, a password must be entered. Digits are set individually, from left to right. The procedure is as follows:

1) The current digit to be set flashes and is set using the and  buttons

2) Press  to confirm each digit setting. The SET indicator appears after the last digit has been set.

3) After setting the last digit, press  to exit the number setting routine. The SET indicator will be removed.

To enter set-up mode, pressing the  button for 3 seconds, until the password screen appears. Password is 1000.

Please follow the settings below and change where needed to meet the same values as shown below. 

Step 5 – Settings on Inverter

Go into the Settings page and select Advanced Settings and select others tab.

Select Ex_Meter for CT, and select Eastron in the drop down menu.