Overview
13
Installation Troubleshooting
SYMPTOM:
The WattNode is reporting zero power.
Probable Causes Corrective
Actions
The WattNode is not receiving the line
voltage that it needs.
First, make sure that the light gray voltage connector is firmly
seated. Then, using a voltmeter, perform the following checks.
For 1P and 3Y models measure the voltage between the
NEUTRAL and øA terminals, for 3D models measure the
voltage between the øA and øB terminals. This voltage should
be within 20% of the values listed in the VAC column of
Table 2: Power and Energy Parameters.
An unused pair of CT screw terminals
has not been jumpered with an insulated
shorting wire.
On any unused CT screw terminals, connect the white and the
black terminals (indicated by dots on the label) together with a
short insulated jumper wire. Strip both ends of the jumper wire
to expose 1/4" (5mm) of bare wire.
One or more CT may be installed
backwards.
If the CT faces towards the load or the white and black wires
have been reversed, then the power for that phase will be
negative. To verify the direction of installation, follow
PROCEDURE A
below.
The voltage and CT wires may be wired
out of phase.
The best approach is to visually verify that everything is wired
correctly, but if that is not a feasible option, then follow
PROCEDURE B
below.
The CT rating may be too large for the
application or the load being measured
may not be active.
If possible, verify that at least 5% of the CT’s rated current is
flowing through the CT. Follow
PROCEDURE C
below to
check the CTs.
The WattNode is not functioning
correctly.
If another WattNode with the same model number is installed
and working, a suspect unit may be tested by disconnecting the
screw terminals from the working unit, and plugging them into
the suspect unit. If the suspect unit works correctly, then most
likely it is the wiring to the suspect unit, and not the WattNode
that is at fault.
SYMPTOM:
The WattNode is reporting an incorrect power.
Probable Causes Corrective
Actions
An unused pair of CT screw terminals
has not been jumpered with an insulated
shorting wire.
On any unused CT screw terminals, connect the white and the
black terminals (indicated by dots on the label) together with a
short insulated jumper wire. Strip both ends of the jumper wire
to expose 1/4" (5mm) of bare wire.
The CTs do not all have the same full-
scale current rating.
Check the current ratings of all the CTs and ensure that they
match.
The CT full-scale current is incorrect.
Recheck the CT’s full-scale current ratings. If the wire is
passed through the CT more than once, then divide the full-
scale current rating by the number of times that the wire passes
through the CT.
One or more CT may be installed
backwards.
If the CT faces towards the load or the white and black wires
have been reversed, then the power for that phase will be
negative. To verify the direction of installation, follow
PROCEDURE A
below.
