48
Operating Instructions
PowerIntScale
(1609)
In order to report power as an integer value (±32,767), the meter must scale the power so that it
doesn’t overflow. By default, the WattNode meter selects a
PowerIntScale
value of 1, 10, 100,
or 1000 whenever the
CtAmps
(or
CtAmpsA
,
CtAmpsB
, or
CtAmpsC
) are changed. The meter
selects a value that won’t overflow unless the power exceeds 120% of full-scale.
PowerIntScale
Power Resolution
Maximum Power Reading
0 (default)
Auto-configure
varies
1
1 watt
±32767 W
10
10 watt
±327.67 kW
100
100 watts
±3276.7 kW
1000
1000 watts
±32767 kW
Custom Values
PowerIntScale
•
1 W
±(PowerIntScale
•
32767 W)
Table 10: PowerIntScale Settings
You may also choose your own custom value for
PowerIntScale
including values that are not
multiples of 10.
If
PowerIntScale
is set to auto-configure, then reading
PowerIntScale
will show the actual scale
factor instead of 0.
To compute the actual power from integer power registers, use the following equation (note, there
is no scaling for the floating-point power registers, which always report power in watts):
ActualPower(W) = PowerRegister • PowerIntScale
PowerIntScale is used with the following registers:
PowerSum
,
PowerA
,
PowerB
,
PowerC
,
PowerReacSum
,
PowerReacA
,
PowerReacB
,
PowerReacC
,
PowerAppSum
,
PowerAppA
,
PowerAppB
,
PowerAppC
,
Demand
,
DemandMin
,
DemandMax
,
DemandApp
.
CurrentIntScale
(1622)
When reporting current values as integers, the WattNode meter scales the current values so that
a current equal to the CT rated amps will result in an output value of
CurrentIntScale
. The default
CurrentIntScale
is 20000. See
for more details.
Demand Configuration
DemPerMins, DemSubints
(1610, 1611)
The variable
DemPerMins
sets the demand interval in minutes (default 15 minutes), and
DemSubints
sets the number of demand intervals (default 1). The time period of each subinterval
is the demand interval divided by the number of subintervals. Setting
DemSubints
to 1 disables
subinterval computations. The demand period cannot be longer than 12 hours (720 minutes), and
a demand subinterval cannot be less than 1 minutes. The
DemSubints
can be set from 1 to 10.
An example configuration could use a demand period of 60 minutes with 4 subintervals. This
would result in a subinterval period of fifteen minutes. Every fifteen minutes, the average power
over the last hour would be computed and reported.
GainAdjustA, GainAdjustB, GainAdjustC
(1612, 1613, 1614)
You may need to adjust the WattNode meter to match the results from a reference meter (such
as the utility meter) or to correct for known current transformer errors. The
GainAdjust
registers
effectively adjust the power, energy, and current calibration or registration for each phase.
The default values for the
GainAdjust
registers are 10,000, resulting in no adjustment. Setting
the value to 10,200 increases all the power, energy, and current readings from the meter by 2%
(10,200 / 10,000 = 102%). Setting the value to 9,800 decreases the readings by 2% (9,800 /
10,000 = 98%). The allowed range is from 5,000 to 20,000 (50% to 200%).
