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Installation 19
Connecting Voltage Terminals
Always turn off or disconnect power
before connecting the voltage inputs to the meter. Con-
nect each phase voltage to the appropriate input on the green terminal block; also connect
ground and neutral (if required).
The voltage inputs to the meter do not need to be powered from to the same branch circuit as
the load being monitored. In other words, if you have a three-phase panel with a 100 A three-pole
breaker powering a motor that you wish to monitor, you can power the meter (or several meters)
from a separate 20 A three-pole breaker installed in the same, or even adjacent panel, so long as
the load and voltage connections are supplied from the same electric service.
The green screw terminals handle wire up to 12 AWG (2.5 mm
2
). Strip the wires to expose 1/4” (6
mm) of bare copper. When wiring the meter, do not put more than one wire under a screw. If you
need to distribute power to other meters, use wire nuts or a power distribution block. The section
Electrical Service Types (p. 10)
shows the proper connections for the different meter models
and electrical services.
Verify that the voltage line phases match the CT phases.
If there is any doubt that the meter voltage rating is correct for the circuit being measured, unplug
the green terminal block (to protect the meter), turn on the power, and use a voltmeter to compare
the voltages (probe the terminal block screws) to the values in the white box on the meter front
label. After testing, plug in the terminal block, making sure that is pushed in all the way.
The WattNode meter is powered from the voltage inputs:
Ø
A
(phase A) to
N
(neutral) for wye
“
-3Y
” models, or
Ø
A
to
Ø
B
for delta “
-3D
” models. If the meter is not receiving at least 80% of the
nominal line voltage, it may stop operating. Since the meter consumes a small amount of power
itself (typically 1-3 watts), you may wish to power the meter from a separate circuit or place the
current transformers downstream of the meter, so its power consumption is not measured
For best accuracy, always connect the
N
(neutral) terminal on the meter. If you are using a delta
meter and the circuit has no neutral, then jumper the earth ground to the
N
(neutral) terminal.
Connecting
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Network Wiring
CCS recommends that an experienced
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network installer be consulted for network
design, particularly for the areas of topology, repeaters, wiring, and termination.
The FT-10 twisted pair network is not polarized, so either network wire can be connected to either
screw terminal. When connecting to a network, there is a maximum permissible stub length. The
stub is the length of the ‘T’ branch wire connecting the main network to the meter. If the main
network wiring is connected directly to the meter, the effective stub length is zero.
Connect the network wiring to the two circuit black terminal block labeled
FT10
. Strip 6 mm (1/4”)
of insulation off the ends of the wires, insert the wires into the terminals and tighten the screws.
If the meter is connected without a stub, then two wires can be installed in each terminal. If this is
done, we recommend twisting the wires together, inserting them all the way into terminal slot, and
securely tightening. Any loose wires can disable an entire section of the network.
After the network wiring has been connected, check that all the wires are securely installed
by gently tugging on each wire in turn. Also check that the terminal block connectors are fully
seated. At this point power may be applied to the meter. Note: there is no harm in applying power
before making the network connections.
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TP/FT-10 Free Topology Network
Traditional multidrop network wiring systems such as RS-485 require a daisy-chain or bus wiring
configuration to prevent interference from signal reflections. The
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TP/FT-10 free topology
network transceivers include signal processing to cancel out reflections, allowing the network
to be wired in arbitrary configurations: bus, star, ring, or some combination. In free topology