Non Zero Voltage Readings on ION6200 or Siemens Access 9200 Meters when nothing is connected to the meter's voltage inputs.

Goals and Symptoms

Problem:
ION6200 or Siemens Access 9200 meters with the P24 low DC voltage power supply option will, in some cases, show readings of 1.5 - to 3.0 volts (Voltage Line to Neutral) for all phases, when nothing is connected to the voltage inputs.

Confirming the Problem:
If the ground cable is removed from the power supply module the line to neutral voltage reading returns to the correct reading of 0 Volts. Alternatively if you remove the Earth cable from the voltage input terminals the voltage reading returns to the correct reading of 0 Volts.

Causes and Fixes

Solution:
ION6200 or Siemens Access 9200 meters with P24 low DC voltage power supplies will be shipped with ferrites that will cover and attach to the power supply cable. All ION6200 or Siemens Access 9200 meters with P24 power supplies shipped after May 14, 2010 will include the ferrite and installation instructions. The ferrite information that we are using can be found below:

Ferrite Information:
Laird technologies
Steward
28A2024-0A2

Please note:
As suggested on page 11 of the ION6200 installation guide: Connect the power supply G (ground) terminal to the same point as the meter earth ground terminal.