5 of 20 - Installing the Meter and CTs (Current Transformers)

Installing the Meter

  1. The meter should should be mounted inside of a weather-proof enclosure
  2. Secure the 35mm DIN rail and then snap the meter onto the rail
     

Installing the Current Transformers (CTs)

  1. Turn off AC power before clamping on current transformers
  2. Install the CTs around the conductors to be measured
    1. Clamp one CT around the L1 wire   
    2. Clamp the second CT around the L2 wire
    3. Split-core CTs can be opened for installation around a conductor. 
    4. Install the CT with the arrow pointing toward the grid for consumption or export measurement
    5. The current transformer is packed together with the meter
  3. The Acrel meter should be mounted inside the main service (or sub) panel. This is what measures the power going to and from the utility company.
    1. The signal wire connects the Acrel meter to the inverter


Wiring the Meter:

  1. Verify that power is OFF before making connections. 
  2. Insert a grounding cable through the appropriate conduit and the knockout that was opened and connect it from Pin 5 of the 5-pin terminal block to the grounding terminal 
  3. Connect the AC side wires (meter input) using the 5-pin terminal block: 
    1. Insert the wires through the appropriate conduit and the knockout that was opened. 
    2. Loosen the appropriate screws on the 5-pin terminal block. 
    3. Connect each AC wire to the appropriate screw terminal (pins 1, 2). Verify that the lines match the symbols printed on the meter front label. 
    4. Connect ground to pin 5 and neutral to pin 3. 
    5. Tighten the screws making sure the wires are fully inserted and cannot be pulled out easily. 
    6. Insert the 5-pin terminal block into the socket on the meter making sure it is fully seated in the meter. 
  4. Connect the CT wires to the 4-pin terminal block (block1):
    1. Insert the wires through the appropriate conduit and the knockout that was opened. 
    2. Connect the blue and brown wires according to the dots printed on the label: blue to pins 1/3, brown to pins 2/4. 
    3. Insert the 4-pin terminal block into the socket on the meter making sure it is fully seated in the meter 
  5. Connect the RS485 twisted pair cable to the 4-pin terminal block (block2): 
    1. Insert the wires through the appropriate conduit and the knockout that was opened. 
    2. Connect the wires to the A+ and B- terminals, and connect the shield to the G terminal. 
    3. Insert the 4-pin terminal block into the socket on the meter making sure it is fully seated in the meter 
  6. Return the terminal block end-stops to the sides of the meter.



Connecting to the Inverter

  1. An RS485 communication cable will need to be ran between the meter and the inverter




M
Michael is the author of this solution article.

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