Install Manual

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Wiring

● For the line voltage wires, CCS recommends 16

to 12 AWG stranded wire, type MTW, THWN, or

THHN, 600 V.

● Do not place more than one voltage wire in a

screw terminal; use separate wire nuts or termi-

nal blocks if needed.

● Verify that the line voltages match the line-to-line

Ø-Ø and line-to-neutral Ø-N values printed in the

white box on the front label.

● The meter is powered from the line voltage in-

puts: ØA (phase A) to N (neutral), or ØA to ØB

for delta models.

Always disconnect power before connecting

the line voltage inputs to the meter. Connect each

line voltage to the appropriate phase; also connect

ground and neutral (if applicable). The neutral con-

nection “N“ is not required on models starting with

WNC-3D, but we recommend connecting it to ground

if neutral is not present.

The screw terminals handle wire up to 12 AWG. Pre-

pare the voltage wires by stripping the wires to ex-

pose 1/4" (6 mm) of bare wire. Connect each voltage

line to the green terminal block as shown in Figure 1

above. Verify that the line voltage phases match the

CT phases. After the voltage lines have been con-

nected, make sure both terminal blocks are securely

installed on the meter.

When power is first applied, check that the LEDs

behave normally: if you see the LEDs flashing red-

green-red-green (see Figure 7 below), then discon-

nect the power immediately! This indicates the line

voltage is too high for this model.

Connect Modbus (RS-485) Outputs

● RS-485 wiring can be complex when multiple

devices are connected, when running wires for

long distances, and when using termination and

biasing resistors. If you have any questions, con-

sult the full “Installation and Operation Manual”.

● The outputs are isolated from dangerous volt-

ages, so you can connect them at any time.

● If the output wiring is near line voltage wiring,

use wires or cables with a 300 V or 600 V rating.

● If the cable is near bare conductors, like bus-

bars, it should be double insulated or jacketed.

● Be sure to connect the A-, B+, and C terminals.

The X terminal is normally not used. You may

use the cable shield for the C connection.

● For long distances, use shielded twisted-pair ca-

ble to prevent interference. With shielded cable,

connect the shield to earth ground at one end.

The WattNode Modbus meter can be connected to

PCs with RS-485 interfaces and to data loggers or

other devices that accept RS-485 Modbus devices.

Configure DIP Switches

Use DIP switches 1-7 to select the Modbus address

(1 to 127) and switch 8 to select the baud rate (OFF

= 9600, ON = 19200).

Installation Summary

1) Mount the WattNode meter.

2) Turn off power before installing toroidal CTs or

making voltage connections.

3) Mount the CTs around the line conductors. Take

care to orient the CTs facing the source.

4) Connect the twisted white and black wires from

the CT to the black terminal block on the meter,

matching the wire colors to the white and black

dots on the meter label.

5) Install or connect appropriate circuit breakers or

fuses and disconnects.

6) Connect the line voltage wires to the green

terminal block of the meter, and check that the

CT phases match the line voltage phases.

7) Connect the output terminals of the WattNode

meter to the monitoring equipment.

8) Check that all the wires are securely installed in

the terminal blocks by tugging on each wire.

9) Apply power to the meter.

10) Verify that the LEDs light correctly and don’t in-

dicate an error condition.

For a full list of registers and settings, see the “In-

stallation and Operation Manual”. At a minimum, the

CtAmps register must be programmed with the rated

amps of the attached current transformers.

Modbus Com Diagnostic LED

Near the upper left corner, there is a Modbus diag-

nostic LED that can indicate the following:

●

Green

A short green flash indicates a good

packet addressed to this device.

●

Yellow

A short yellow flash indicates a good

packet addressed to a different device.

●

Red

A one second red flash indi-

cates an invalid packet: bad baud rate, bad par-

ity, bad CRC, noise, etc.

●

Red

Solid red indicates the

address is set to zero: an invalid choice.

●

YR YR YR

Rapid red/yellow flashing

indicates a possible Modbus address conflict.

Power Diagnostic LEDs

The three status LEDs on the front of the meter can

help indicate correct operation. The “A”, “B”, and “C”

on the diagrams indicate the three phases.

1.0sec

1.0sec1.0sec

GreenYellowRed

Figure 2: Normal Startup

The meter displays this startup sequence whenever

power is first applied.

Green

Off

Green

Off

Green

Off

Figure 3: Positive Power

Any phase with the LEDs flashing green is indicating

normal positive power.

Green

Figure 4: No Power

Any phase with a solid green LED indicates no power,

but line voltage is present.

Off

Figure 5: No Power - Zero Vac

Any phase LED that is off indicates no voltage on

that phase.

Red

Off

Red

Off

Red

Off

Figure 6: Negative Power

Red flashing indicates negative power for that

phase. Reversed CTs, swapped CT wires, or CTs

not matched with line voltage phases can cause this.

1.0sec

GR GR GR GR GR GR

GR GR GR GR

GR GR

GR GR GR GR

GR GR

Figure 7: LED Overvoltage Warning

The line voltage is too high for this model. Disconnect

power immediately! Check the line voltages and the

meter ratings (in the white box on the label).

Off

Figure 8: Meter Not Operating

If none of the LEDs light, then check that the correct

line voltages are applied to the meter. If the voltages

are correct, call customer service for assistance.

3.0sec

Red

Figure 9: WattNode Error

If the meter experiences an internal error, it will light

all LEDs red for three or more seconds. If you see

this happen repeatedly, return the meter for service.

For other LED patterns, see the “Installation and

Operation Manual” or contact support for assistance.

3131 Indian Rd.

Boulder, CO 80301

(303) 444-7422

http://www.ccontrolsys.com

WattNode is a registered trademark of Continental

Control Systems, LLC.

Document Number: WNC-MB-QIG-V18b

Revision Date: Nov. 30, 2011