28
Operating Instructions
Name
SNVT Type
Units
SNVT# Description
Demand Variables (DemandMeas)
nciDemPerMins*
SNVT_count
1 minute
8
Demand period: 5-720 minutes. Default
15 minutes
nciDemSubints*
SNVT_count
9
Rolling demand subinterval count: 1-8.
Default 1 subinterval
nviResetPkDemand
SNVT_count
10
Write “1” to reset peak demand
nvoDemand
SNVT_power_f
watts
11
Demand power (average power over
demand period)
nvoDemandPk*
SNVT_power_f
watts
12
Peak demand power
nvoPeakDemT*
SNVT_time_stamp
13
Date/time of peak demand
Voltage Variables
nvoVoltsA
SNVT_volt_f
volts
22
RMS voltage, phase A
nvoVoltsB
SNVT_volt_f
volts
23
RMS voltage, phase B
nvoVoltsC
SNVT_volt_f
volts
24
RMS voltage, phase C
Frequency Register
nvoFreq
SNVT_freq_f
Hz
25
Line frequency
Current Registers
nvoCurrentA
SNVT_amp_f
amps
26
RMS current, phase A
nvoCurrentB
SNVT_amp_f
amps
27
RMS current, phase B
nvoCurrentC
SNVT_amp_f
amps
28
RMS current, phase C
Power Factor Registers
nvoPfAvg
SNVT_pwr_fact_f
29
Power factor, total
nvoPfA
SNVT_pwr_fact_f
30
Power factor, phase A
nvoPfB
SNVT_pwr_fact_f
31
Power factor, phase B
nvoPfC
SNVT_pwr_fact_f
32
Power factor, phase C
Reactive Power Registers
nvoReacPwrSum
SNVT_power_f
VAR
37
Reactive power, sum of phases
nvoReacPwrA
SNVT_power_f
VAR
38
Reactive power, phase A
nvoReacPwrB
SNVT_power_f
VAR
39
Reactive power, phase B
nvoReacPwrC
SNVT_power_f
VAR
40
Reactive power, phase C
*These network variables are preserved across power failures.
Table 4: Network Variables
General Variables (NodeObject)
nciCtAmps
Use
nciCtAmps
to specify the rated current of the attached current transformers (CTs).
To measure very low currents more accurately, you may loop the conductor being measured
through the CT more than once. In this case, the effective CT amps is divided by the number of
times the conductor passes through the CT. For example, if you pass the wire through a 30A CT
three times, the effective CT amps becomes 10A.
In other cases, you may want to use two or more CTs in parallel on each phase. If you do this, the
parallel CTs must be the same model. The effective CT amps is the rated CT amps multiplied by
the number of CTs in parallel, so two 100A CTs in parallel is equivalent to a 200A CT.
nviRequest / nviStatus
The WattNode meter provides basic request and status features to meet the
L
on
M
ark
require-
ments. The request variable
nviRequest
is used to request information from the meter. The
