Specifications 31
Specifications
Models
Model
Nominal Vac
Line-to-Neutral
Nominal Vac
Line-to-Line
Phases
Wires
WNB-3Y-208-P
120
208–240
3
4
WNB-3Y-400-P
230
400
3
4
WNB-3Y-480-P
277
480
3
4
WNB-3Y-600-P
347
600
3
4
WNB-3D-240-P
120*
208–240
3
3–4
WNB-3D-400-P
230*
400
3
3–4
WNB-3D-480-P
277*
480
3
3–4
* Note: the delta models have an optional neutral connection that may be used for measuring
wye circuits. In the absence of neutral, voltages are measured with respect to ground. Delta
WattNode models use the phase A and phase B connections for power.
Table 9: WattNode Models
Model Options
Any of these models are available with the following options:
●
Bidirectional Outputs
-
(this is the standard model)
This model has two pulse output chan-
nels.
P1
generates pulses in proportion to the total real positive energy, while
P2
generates
pulses in proportion to the total real negative energy. The individual phase energies are all
added together every 200 ms. If the result is positive, it is accumulated for the
P1
output; if
negative, it is accumulated for the
P2
output. If one phase has negative power (-100 W), while
the other two phases have positive power (+100 W each), the negative phase will subtract
from the positive phases, resulting in a net of 100 W, causing pulses on
P1
, but no pulses on
P2
. There will only be pulses on
P2
if the sum of all three phases is negative.
●
Option P3
: Per-Phase Outputs
- Models with this option have three pulse output channels:
P1
,
P2
, and
P3
. Each generates pulses in proportion to the real positive energy measured on
one phase (phases A, B, and C respectively).
●
Option DPO
: Dual Positive Outputs
- This option is like the standard model with
bidirectional outputs, but with the addition of the
P3
output channel. The
P3
chan-
nel indicates positive real energy, just like the
P1
channel. This is useful when the meter
needs to be connected to two different devices, such as a display and a data logger. See
Manual Supplement MS-11: Option DPO (Dual Positive Outputs)
for details.
●
Option PV
: Photovoltaic
- The photovoltaic option measures residential PV systems. It
allows one WattNode meter to measure the bidirectional total house energy, and the PV (or
wind) generated energy. See
Manual Supplement MS-10: Option PV (Photovoltaic)
for details.
●
Option Hz
: Custom Pulse Output Frequency
- WattNode meters are available with custom
full-scale pulse output frequencies ranging from 0.01 Hz to 600 Hz (150 Hz maximum for
Options P3, DPO,
and
PV
). For custom frequencies, specify
Option Hz=nnn
, where
nnn
is the desired full-scale frequency. To specify different frequencies for
P1
,
P2
, and
P3
, use
Option Hz=rrr/sss/ttt
, where
P1
frequency =
rrr
,
P2
frequency =
sss
,
P3
frequency =
ttt
.
●
Option SSR
: Solid State Relay Output
- Replaces the standard optoisolator outputs with
solid state relays capable of switching 500 mA at up to 40 Vac or ±60 Vdc. See
below for details.
●
Option TVS=24
- Install 24 V bidirectional TVS protection diodes across P1, P2, and P3
outputs. Used with
Option SSR
when driving 12 Vdc electromechanical counters to protect
the solid-state relays from the inductive kickback of the counter.
