Carrier KW320 User manual

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 1of 20
Overview
4 Channel Power Meter, 0.1 Class, Multiple Communication
Protocols
The KW320 meter combines high performance with ease of
integration to provide a power and energy monitoring solution with
400 metering parameters. The KW320 series multifunction digital
power meter is designed using modern MCU and DSP technology
and its tamper-proof design is approved for revenue applications. It
integrates three-phase energy measuring and displaying, energy
accumulating, power quality analysis, malfunction alarming, data
logging and network communication. The meter measures
bidirectional, four quadrants kWh and kvarh. It provides
maximum/minimum records for power usage and power demand
parameters. All power and energy parameters can be viewed
remotely via Accuview Utility Software to monitor various
parameters. The meter comes standard to be mounted in a 4"
Round or an IEC 92mm DIN Square form or has the flexibility to be
mounted to 35mm DIN rail with the N2-AXM-DIN adapter (See
Accessories Ordering).
In addition, the KW320 also has an optional upgrade that includes a
NEMA 4X panel enclosure, pre-wired and labeled terminal for CT’s,
terminal blocks for voltage input, and industrial grade fuses. The N2-KW320-P1-D-W-PC-C optional upgrade is an all-in-one Plug
n’ play Pre-Wired Panel Enclosure that provides a perfect solution for retrofit projects where metering space is not pre-designed
in an electrical distribution panel. The meter supports user selectable RS-485 serial Modbus-RTU, BACnet™ MS/TP, multiple
Ethernet communication protocols, and Wi-Fi connection allows seamless integration with data acquisition systems. This product
provides demand measurement of Current, Active Power, Reactive Power and Apparent Power – see table 1 for all parameters
monitored and metered. It also provides demand forecasting as well as the peak demand. The KW320 series meter can record
the time and event regarding important parameter events such as the run time of the meter and alarm functions. The KW320
meter will accept both 333mV and Rogowski coil CT inputs (Input Field Selectable). Meters come standard with a four channel CT
input to accurately measure neutral current. CTs are sold separately as shown on the Split-Core, Solid-Core and Rogowski
Current Transformer product data sheets.
Applications: Tenant Billing, Data Centers, Sub-Metering Electrical Panel, Equipment Load Monitoring, Industrial Applications,
Predicted Maintenance, Renewable Energy, Overhead Cost Reduction, “NET ZERO” Buildings, LEED Buildings, Green Buildings,
and Refrigeration
The KW320 Power Meters are covered by a Five (5) Year Limited Warranty
Part Numbers
N2-KW320-P1-D-W-XX-C N2-KW320-P1-D-W-PC-C N2-KW320Q-P1-D-W-XX-C
N2-KW320Q-P1-D-W-PC-C N2-USB-RS485 N2-AK-03
N2-AXM-DIN

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 2of 20
Product Specifications
Service Type:
Single Phase, 3 Phase – Four Wire (WYE), Three Phase – Three Wire (Delta)
Power1:
100 - 415VAC, 50/60Hz, 100 - 300VDC on terminals L and N
Burden:
5W
Withstand:
3250VAC, 50/60Hz for 1 minute
Power Supply Wiring:
AWG22-16 (0.6-1.5mm2)
AC Fuse Protection:
External 1A/250VAC Fuse (Recommended)
Rated Voltage:
100-400VAC Line to Neutral (L-N) or 100-690VAC Line to Line (L-L) RMS for three
phase or 100-400VAC RMS for single phase
Number of CT Inputs:
4 (L1, L2, L3, and Neutral)
Revenue Grade Accuracy:
Active Energy - Class 0.1s (According to IEC 62053-22) and Class 0.1s (According
to ANSI C12.20)
Reactive Energy - Class 2 (According to IEC 62053-23) – See Table 2 for parameter
accuracy, resolution, and range
Voltage Channels:
400 Volts AC (L-N), 690 VAC (L-L), 45Hz - 65Hz, 300Hz - 500Hz
Withstand Voltage:
1500VAC Continuous, 2500VAC, 50/60Hz for 1 Minute
Input Impedance:
2M ohm per Phase
Pickup Voltage:
10VAC
Current Channels:
4 Channels, 0.400 VAC max, 333 mV CTs or 0 to 6000 Amps with Rogowski Coils
(Field Selectable)
Maximum Current Input:
120% of current sensor rating (mV CTs) to maintain accuracy. Up to 6000 Amps w/
Rogowski Coils
Harmonic Resolution:
63rd Harmonic (50Hz or 60Hz type) or 15th Harmonic (400Hz type)
Measurement Type:
Real-time, True RMS measurement of instantaneous Voltage, Current, Power,
Frequency, Harmonics, Phase Angle, Demand, Unbalance Factor, Running Time,
and Power Factor
Line Frequency:
50/60 Hz
Measurement Data Parameters:
See Table 1
Real Time Parameter Update
Rate:
<20 ms
Accumulated Parameter Update
Rate:
1 Sec
LCD Display:
Multiple Display Modes (Important Parameter’s, All Parameter’s, Settings Display
Modes)
Communication Protocols:
Serial RS-485: Modbus RTU and BACnet MS/TP
Ethernet: BACnet™ Over IP, IEC 61850, Modbus®-TCP, HTTP/HTTPs Webserver,
SMTP Email, SNMP, HTTP/HTTPs Push, FTP Post, sFTP Server, Wi-Fi
Maximum Distance:
1200 meters (3,937 Feet) with data range of 100K bits/second or less
Termination Resistor:
120 Ohm to 300 Ohm 1/4W Resistor (Not Included); (Installed at end of RS-485
Comm Bus)
Supported Baud Rates:
BACnet MS/TP Protocol: 9600, 19200, 38400, 76800 Baud Rate (38400 BACnet
Default)
Modbus RTU Protocol: 1200, 2400, 4800, 9600, 19200, 38400 Baud Rate (19200
Modbus Default)
Max Station:
127 MS/TP Masters (MAC Addresses is 0 to 127)
BACnet Device Instance Number:
1 (Default); Field adjustable from 1 to 4194302
Modbus Data Bits / Parity / Stop
Bit
8 / None, Even, Odd / 2, 1
Datalogging Storage:
8 GB
Enclosure Material /
Flammability Rating:
Polycarbonate / UL 94V-0
Operating Temperature Range:
-13 to 158oF (-25 to 70ºC)
Storage Temperature Range:
-40 to 185oF (-40 to 85oC)
Operating / Storage Humidity
5 to 95%, non-condensing

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 3of 20
Range:
Wiring Connections:
Screw Connections
Wire Size:
14-22 AWG (2.5 to 0.34 mm2)
Mounting:
ANSI C39.1 (4" Round) or an IEC 92mm DIN (Square) form.
Utility Software:
AcuView Utility Software, Windows Based; (USB-RS485 converter is required to
connect to computer)
Agency Approvals:
BTL Certified, CE, RoHS2, cULus Listed (File # E359521)
Standard Compliance:
Measurement Standard: IEC 62053-22; ANSI C12.20
Environmental Standard: IEC 60068-2
Safety Standard: IEC 61010-1, UL 61010-1, IEC 61557-12
EMC Standard: IEC 61000-4/-2-3-4-5-6-8-11, CISPR 22, IEC 61000-3-2, IEC 61000-
6-2/4
Outlines Standard: DIN 43700, ANSI C39.1
Face Dimensions (L x W x H):
3.80" (96 mm) x 3.80" (96 mm) x 1.99" (50.7 mm)
Power Meter Weight:
0.77 lbs. (350g )
KW320 Panel Upgrade (Optional)
NEMA Rating:
NEMA 4X
Enclosure Material:
Polycarbonate
Fuse:
600 VAC/1A
Wiring:
Two pluggable pre-cut holes to feed wiring, fused terminal blocks for voltage
connections pre-installed, color-coded and labelled
Flammability Rating:
94-V0
Enclosure Dimensions (L x W
x H):
7.88" (200 mm) x 11.81" (300 mm) x 7.34" (186.5 mm)
Enclosure Product Weight:
8 lbs. (3.63 kg)
NOTE A power supply can be an independent power supply and a fuse (typical 1A/250Vac) is suggested to be
used when connecting the power supply to the meter.

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 4of 20
Table #1
CATEGORY
ITEM
Parameters
Metering
Real time
metering
Phase Voltage
V1, V2, V3, Vlnavg
Line Voltage
V12, V23, V31, Vllavg
Current
I1, I2, I3, In, Iavg
Power
P1, P2, P3, Psum
Reactive Power
Q1, Q2, Q3, Qsum
Apparent Power
S1, S2, S3, Ssum
Power Factor
PF1, PF2, PF3, PF
Frequency
F
Load Features
Load Features
Four Quadrant
Powers
Four Quadrant Powers
Energy &
demand
Energy
Ep_imp, Ep_exp, Ep_total, Ep_net, Epa_imp, Epa_exp,
Epb_imp, Epb_exp, Epc_imp, Epc_exp
Reactive Energy
Eq_imp, Eq_exp, Eq_total, Eq_net, Eqa_imp, Eqa_exp,
Eqb_imp, Eqb_exp, Eqc_imp, Eqc_exp
Apparent Energy
Es, Esa, Esb, Esc
Demand
Dmd_P, Dmd_Q, Dmd_S, Dmd_I1, Dmd_I2, Dmd_I3
Monitoring
Power quality
Voltage
Unbalance Factor
U_unbl
Current
Unbalance Factor
I_unbl
Voltage THD
THD_V1,THD_V2,THD_V3, THD_Vavg
Current THD
THD_I1, THD_I2, THD_I, THD_Iavg
Individual
Harmonics
Harmonics 2nd to 63rd (50H or 60Hz) Harmonics 2nd to
15th (400Hz)
Voltage Crest
Factor
Crest Factor
TIF
THFF
Current K factor
K Factor
Statistics
MAX with Time
Stamp MIN with
Time Stamp
Each phase of V & l; Total of P, Q, S, PF & F; Demand of
I1, I2, I3, P, Q&S; Each phase THD of V & I; Unbalance
factor of V & I
Others
Alarm Over/Under Limit
Alarm
V, I, P, Q, S, PF, V_THD & I_THD Each Phase and Total
or Average; Unbalance Factor of V & I; Load Type; Analog
Input of Each Channel; Demand of I1, I2, I3, P, Q&S;
Reverse phase sequence; DI1~DI28
Power quality
event logging
(KW320Q
model only)
Sag/Dips, Swell Voltage
Onboard
memory size
Memory 8GB on all 4 models
Communication
RS485 Port, Half
Duplex, Optical
Isolated
Modbus®-RTU Protocol
Time
Real Time Clock
Year, Month, Date, Hour, Minute, Second

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 5of 20
Table #2
METERING
Parameters
Accuracy
Resolution
Range
Voltage
0.1%
0.1V
10V~1000kV
Current
0.1%
0.001A
5mA~50000A
Power
0.1%
1W
-9999MW~9999MW
Reactive Power
0.1%
1var
-9999Mvar~9999Mvar
Apparent Power
0.1%
1VA
0~9999MVA
Power Demand
0.1%
1W
-9999MW~9999MW
Reactive Power Demand
0.1%
1var
-9999Mvar~9999Mvar
Apparent Power Demand
0.1%
1VA
0~9999MVA
Power Factor
0.1%
0.001
-1.000~1.000
Frequency 0.001% 0.001Hz 45.00~65.00Hz (50 or 60Hz type)
300.00Hz~500.00Hz (400Hz type)
Energy
Primary
0.1%
0.1kWh
0-99999999.9kWh
Secondary
0.1%
0.001kWh
0-999999.999kWh
Reactive
Energy
Primary
0.1%
0.1kvarh
0-99999999.9kvarh
Secondary
0.1%
0.001kvarh
0-999999.999kvarh
Apparent
Energy
Primary
0.1%
0.1kVAh
0-99999999.9kVAh
Secondary
0.1%
0.001kVAh
0-999999.999kVAh
Harmonics
1.0%
0.1%
Phase Angle
2.0%
0.1°
0.0°~359.9°
Unbalance Factor
2.0%
0.1%
0.0%~100.0%
Running Time
0.01h
0~9999999.99h

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 6of 20
Product Drawings
Power Meter Panel Upgrade
Standard Ordering
Part #
mV CT
Input
Rogowski Coil
Input
Meter Only
Panel
Upgrade
Waveform
Capture
N2-KW320-P1-D-W-X-C
X
X
X
N2-KW320-P1-D-W-PC-C
X
X
X
N2-KW320Q-P1-D-W-XX-C
X
X
X
X
N2-KW320Q-P1-D-W-PC-C X X X X

4-Channel Power Meters
Specification
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 7of 20
Accessories Ordering
Part #
Description
N2-AXM-DIN
KW320 DIN Rail Adapter
N2-USB-RS485
RS485 to USB Converter
N2-AK-03
Three Fuse Pack; Inline Fuse Kit; 600V, 2A; Slow Blow

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 8of 20
Mounting Instructions
Part Name
Description
1. LCD Display Large bright white backlight LCD display
2. Front Casing Visible portion (for display and control) after mounting onto a panel
3. Key Four keys are used to select display and set
4. Enclosure The KW320 series meter enclosure is made of high strength anti-combustible
engineering plastic
5. Voltage Input Terminals Used for voltage input

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 9of 20
6. Current Input Terminals Used for current input
7. Power Supply Terminals Used for control power input
8. Communication Terminals Communication output
9. Installation Clip
Used for fixing the meter to the panel
10. Gasket Insert the gasket in between the meter and the cutout to cover up gaps from the round
hole
Installation Methods
Environmental:
Before installation, please check the environment, temperature and humidity to ensure the KW320 series meter is being placed
where optimum performance will occur.
Temperature:
Operation: -25 to 70°C (-13 to 158°F) Storage: -40 to 85°C (-40 to 185°F) Humidity:
5% to 95% non-condensing.
Location:
KW320 series meter should be installed in a dry and dust free environment. Avoid exposing the meter to excessive heat, radiation
and high electrical noise sources.
Installation Steps:
The KW320 series meter can be installed into a standard ANSI C39.1 (4" Round) or an IEC 92mm DIN (Square) form.
1. Cut a square hole or round hole on the panel of the switch gear. The cutting size is show in the figure below.
2. Remove the clips from the meter and insert the meter into the square hole from the front side. Please note: optional rubber
gasket must be installed on the meter before inserting the meter into the cut out.

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 10 of 20
3. Install clips on the back side of the meter and secure tightly to ensure the meter is affixed to the panel.
NOTE The display meter and the remote display unit have the same installation method. The DIN rail meter is simply installed on
a 35mm DIN rail.
Wiring Instructions
Warning
•Installation of the meter must be performed by qualified personnel only, who follow standard safety
precautions through the installation procedures. Those personnel should have appropriate training and
experience with high voltage devices. Appropriate safety gloves, safety glasses and protective clothing
are recommended.
•During normal operation, dangerous voltage may flow through many parts of the meter, including
terminals, and any connected CTs (Current Transformers) and PTs (Potential Transformers) and their
circuits. All primary and secondary circuits can, at times, produce lethal voltages and currents. AVOID
contact with any current- carrying surfaces.
•The meter and its I/O output channels are NOT designed as primary protection devices and shall NOT be
used as primary circuit protection or in an energy limiting capacity. The meter and its I/O output channels
can only be used as secondary protection. AVOID using the meter under situations where failure of the
meter may cause injury or death. AVOID using the meter for any application where risk of fire may occur.

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 11 of 20
Warning
•All meter terminals should be inaccessible after installation.
•Do NOT perform Dielectric (HIPOT) test to any inputs, outputs or communication terminals. High voltage
testing may damage electronic components of the meter.
•Applying more than the maximum voltage the meter and/or its modules can withstand will permanently
damage the meter and/or its modules. Please refer to the specifications for all devices before applying
voltages.
•When removing meter for service, use fuses for voltage leads and power supply to prevent hazardous
voltage conditions or damage to CTs.
•DISCONNECT DEVICE: The following part is considered the equipment disconnect device.
•A SWITCH OR CIRCUIT-BREAKER SHALL BE INCLUDED IN THE INSTALLATION. THE SWITCH
SHALL BE IN CLOSE PROXIMITY TO THE EQUIPMENT AND WITHIN EASY REACH OF THE
OPERATOR. THE SWITCH SHALL BE MARKED AS THE DISCONNECTING DEVICE FOR THE
EQUIPMENT.
•IF THE EQUIPMENT IS USED IN A MANNER NOT SPECIFIED BY THE MANUFACTURER, THE
PROTECTION PROVIDED BY THE EQUIPMENT MAY BE IMPAIRED.
Tip
•Recommend using a dry cloth to wipe the meter.
•THERE IS NO REQUIRED PREVENTIVE MAINTENANCE OR INSPECTION NECESSARY FOR
SAFETY. HOWEVER, ANY REPAIR OR MAINTENANCE SHOULD BE PERFORMED BY THE
FACTORY.
Terminal Strips
There are four terminal strips at the back of the KW320 series meter. The three-phase voltage and current are represented by
using 1, 2 and 3 respectively. These numbers have the same meaning as A, B and C or R, S and T used in other literature.
Safety Earth Connection Before setting up the meter's wiring, please make sure that the switch gear has an
earth ground terminal. Connect both the meter's and the switch gear's ground terminal together. The following
ground terminal symbol is used in this user's manual.

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 12 of 20
Power Requirements
Control Power:
There are 2 options for the Control Power of the KW320 series meter:
Standard: 100~415 VAC (50/60Hz) or 100-300VDC
The meter's typical power consumption is very low and can be supplied by an independent source or by the measured load line. A
regulator or an uninterrupted power supply (UPS) should be used under high power fluctuation conditions. Terminals for the
control power supply are 11, 12 and 13 (L, N and Ground). A switch or circuit-breaker shall be in close proximity to the equipment,
within easy reach of the operator and shall be marked as the disconnecting device for the equipment.
A fuse (typical 1A/250VAC) should be used in the auxiliary power supply loop. No. 13 terminal must be connected to the ground
terminal of the switchgear. An isolated transformer or EMC filter should be used in the control power supply loop if there is a power
quality problem in the power supply.
Choice of wire of power supply is AWG 22-16 or 0.6-1.5 mm2.
Voltage Input
Maximum input voltage for the KW320 series meter shall not exceed 400LN/690LL VAC rms for three phase or 400LN VAC rms
for single phase. Potential Transformer (PT) must be used for high voltage systems. Typical secondary output for PT's shall be
100V or 120V. Please make sure to select an appropriate PT to maintain the measurement accuracy of the meter. When
connecting using the star configuration wiring method, the PT's primary side rated voltage should be equal to or close to the line
voltage of the system. A fuse (typical 1A/250VAC) should be used in the voltage input loop. The wire for voltage input is AWG16-
12 pr 1.3-2.0 mm2.
NOTE In no circumstance should the secondary of the PT be shorted. The secondary of the PT should be grounded at one end.
Please refer to the wiring diagram section for further details.
Current Input:
Current Transformers (CTs) are required in most applications. The KW320 series meter supports two CT input types: 333mV (SC)
or Rogowski coil (RCT). Meter model selection is determined by which style of current transformer input being used. The CT
should be selected to maintain revenue grade accuracy of the system. The distance between CT and the meter should be as short
as possible as the length of the CT leads will have an effect on the accuracy.
The meter requires AWG22-14 as the wire size to the current input terminals.

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 13 of 20
Note: The secondary side of the CT should not be open circuit in any circumstance when the power is on. There should not be any
fuse or switch in the CT loop.
When using mV and RCT CT's the secondary leads must not be grounded
VN Connection
VN is the reference point of the KW320 series meter voltage input. Low wire resistance helps improve the measurement accuracy.
Different system wiring 20 modes require different VN connection methods. Please refer to the wiring diagram section for more
details.
Three Phase Wiring Diagram
This meter can satisfy almost any kind of three phase wiring diagrams. Please read this section carefully before choosing the
suitable wiring method for your power system.
Voltage and current input wiring mode can be set separately in the meter parameter setting process. The voltage wiring mode can
be set as 3-phase 4-line Wye (3LN), 3-phase 3-line direct connection (3LL), 3-phase 3-line open delta (2LL), single phase 2-line
(1LN) and single phase 3-line (1LL). The current input wiring mode can be set as 3CT, 2CT and 1CT.
Voltage Input Wiring
3-Phase 4-Line Wye Mode (3LN):
The 3-Phase 4-Line Wye mode is commonly used in low voltage electric distribution power systems. For voltage lower than
400LN/690LL VAC, power line can be connected directly to the meter's voltage input terminal as shown in Fig 2-9a. For high
voltage systems (over 400LN/690LL VAC), PT's are required as shown in Fig 2-9b. The meter should be set to 3LN for both
voltage levels.
Figure 1: 3LN Direct Connection

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 14 of 20
Figure 2: 9b3LN with 3PT
3-Phase 3-Line Direct Connection Mode (3LL):
In a 3-Phase 3-Line system, power line A, B and C are connected to V1, V2 and V3 directly. VN is floated. The voltage input mode
of the meter should be set to 3LL.
Figure 3: 3LL 3-Phase 3-Line Direct Connection

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 15 of 20
3-Phase 3-Line Open Delta Mode (2LL):
Open Delta Wiring Mode is often used in high voltage systems. V2 and VN are connected together in this mode. The voltage input
mode of the meter should be set to 2LL for this voltage input wiring mode.
Figure 4: 2LL With 2PT's
Current Input Wiring
3CT:
Figure 5: 3CT's

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 16 of 20
2CT:
Figure 6: 2CT's
1CT:
Figure 7: 1CT

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 17 of 20
Frequently Used Wiring Method
In this section, the most common voltage and current wiring combinations are shown in different diagrams. In order to display
measurement readings correctly, please select the appropriate wiring diagram according to your setup and application.
Figure 8: 3LN, 3CT

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 18 of 20
Figure 9: 2LL, 3CT
Figure 10: 1LN, 1CT

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 19 of 20
Figure 11: 1LL, 2CT
Communication
The KW320 meter supports user selectable RS-485 serial Modbus-RTU, BACnet™ MS/TP, dual Ethernet ports with multiple
communication protocols, and Wi-Fi communication allows seamless integration with data acquisition systems.
KW320 series meter uses RS485 serial communication for both BACnet MS/TP and Modbus RTU protocols. The terminals of
communication are A, B and S (14, 15, 16). A is differential signal +, B is differential signal - and S is connected to the shield of the
twisted pair cables. Up to 32 devices can be connected on a RS485 bus. Use good quality shielded twisted pair cable, AWG22
(0.5mm2) or higher. The overall length of the RS485 cable connecting all devices should not exceed 1200m (40000 ft). The
KW320 series meter is used as a slave device of masters such as a PC, PLC, Data Collector or RTU.
If the master does not have RS485 communication port, a converter (such as a RS232/RS485 or a USB/RS485 converter) will be
required. Typical RS485 network topologies include line, circle and star (Wye). The shield of each segment of the RS485 cable
must be connected to the ground at one end only.
Every A(+) should be connected to A(+), B(-) to B9(-) or it will influence the network or even damage the communication interface.
The connection topology should avoid "T" type which means there is a new branch and it does not begin from the beginning point.
Keep communication cables away from sources of electrical noise whenever possible.
When using a long communication cable to connect several devices, an anti-signal reflecting resistor (typical value 120Ω-
300Ω/0.25W) is normally added to the end of the cable beside the last meter if the communication quality is distorted.
Use RS232/RS485 or USB/RS485 converter with optical isolated output and surge protection.
Refer to Chapter 6 of this manual for additional details on both Modbus RTU and BACnet MS/TP communication.
The KW320 meter also includes dual Ethernet ports that enables seamless integration utilizing BACnet IP, Modbus TCP, IPv6,
and additional communication protocols. Refer to Chapter 5 of this manual regarding wiring and meter configuration as it relates
Ethernet.

4-Channel Power Meters
Installation and Operation
#N2-KW320 and N2-KW320Q Series– 8/14/23
Specifications subject to change without notice.
Catalog No. 11-808-974-01 Page 20 of 20
Appendix – Symbols Key
Warning Potential for death, serious injury, or permanent damage to a system.
Caution Potential for injury, damage to a system, or system failure.
Tip
Useful information not related to injury or system damage.