- Install a 100K Ohm resistor in-line with the Equipment Ground terminal (19).
- Disconnect Equipment Ground terminal (18).
The EUR–5A sensor circuits and the EMC inputs are referenced to a common circuit ground. In most situations, this part of the system can be left floating from the building panel ground (not connected to it). In some cases, noise or transient immunity may be improved if the EUR–5A (with its sensors) is actually grounded to the building ground. But this can create a voltage difference on the sensors because of the difference in the electrical potential of the building ground and the outdoor building structures contacting the sensors creating a ground loop. To avoid this potential ground loop install a resistor, such as 100 ohms, between the EUR–5A ground terminal (18 or 19) and the building panel ground.