Honeywell Class 320 Meter User manual

62-0397-02
INSTALLATION INSTRUCTIONS
Class 320 Meter
ADVANCED KWH/DEMAND METER

CLASS 320 METER
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TABLE OF CONTENTS
Section 1.0 Introduction 3
Section 2.0 Internal Electronic Assemblies 5
Section 2.1 Main Power Board 5
Section 2.2 Display Board 6
Section 3.0 Meter Technical Specifications 7
Section 4.0 Safety Label Definitions and Information 10
Section 5.0 Precautionary and Safety Information 11
Section 6.0 Meter Installation 12
Section 6.1 Mounting the Class 320 Meter 12
Section 6.2 Main Power Board Connections 12
Section 6.3 Phasing of Line Voltage 16
Section 6.4 Current Sensor Installation & Wiring 17
Section 6.5 Main Power & Current Sensor Wiring Diagram 19
Section 6.6 Line Voltage/Current Sensor Diagnostics 20
Section 6.7 RS-485 Wiring 21
Section 6.8 RS-232 Communications 24
Section 6.9 Modem Wiring 26
Section 6.10 Modbus RTU Wiring 29
Section 6.11 BACnet MS/TP Wiring 30
Section 6.12 Connecting Class 320 Meters to USB Key using RS485 30
Section 6.13 Ethernet Communications 31
Section 7.0 Multiple-Load Monitoring 32
Section 8.0 Preventative/Scheduled Maintenance 33
Section 9.0 Lithium Battery Replacement 34
Section 10.0 Class 320 Meter Operating Modes 36
Section 10.1 Start Up Screens 36
Section 10.2 Normal Mode Display Screens 37
Section 10.3 How to Program the Display Screens 38
Section 11.0 High Voltage Metering 43
Section 12.0 Class 320 Protocol Definitions 46
Section 13.0 Meter Limited Warranty 53

CLASS 320 METER
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1.0 INTRODUCTION
The Honeywell Class 320 meter is a 3-element meter with communications. The
device is used to monitor electric power usage of individual loads after the utility meter
and store kW and kVAR data for automatic meter reading. Installation must only be
performed by qualified personnel and in accordance with these instructions and all
applicable local and national electrical codes. E-Mon and its representatives assume
no responsibility for damages or injury resulting from the improper installation of this
meter.
Verify the input voltage rating and configuration on the unit panel label to ensure that it
is suitable for the intended electrical service. For example, Class 320 meters labeled
for 120/208V service MUST NOT be installed on service feeds of 277/480 volts or 347/
600 and vice versa.
Verify that the Class 320 meter’s current sensors are sized suitably for the load to be
monitored. Compare the color of the arrows on the current sensors to the chart below
to confirm the correct current sensor is being used.
Meter Labeled: Works On:
120V 120V, Single Phase
120/240V 120/240V, Single Phase
277V 277V, Single Phase
208V 208V, Three Phase
240V 240V, Three Phase
400V (380V,415V) 400V, Three Phase
480V 480V, Three Phase
600V 600V, Three Phase
Sensor Arrow Color Code Sensor Rating
Brown 100 A
Red 200 A
Yellow 400 A
Black 800 A
Blue 1600 A
White/Black 3200 A

CLASS 320 METER
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CAUTION
Internal circuit components are extremely sensitive to electrostatic discharge.
Prior to handling or touching internal circuitry, discharge any static buildup on
your person. To discharge yourself, touch a grounded metal object such as
conduit or an earth-grounded enclosure.
WARNING
Use of this instrument, the Honeywell Class 320 meter, in a manner
inconsistent with this manual or not specified by the manufacturer in writing,
can cause permanent damage to the unit and/or serious injury to the operator.
The protection and safety features provided by this equipment may become
impaired or otherwise compromised.
NOTE: If any trouble arises during the installation or functional verification opera-
tions, do not immediately remove the unit. Before removing the unit, contact
Honeywell’s technical support and/or engineering department. Honeywell’ s
technical department will assist you in detailed troubleshooting of the Class
320 meter installation and assist you in getting the unit operating correctly.

CLASS 320 METER
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2.0 INTERNAL ELECTRONIC ASSEMBLIES
The units are comprised of two major subassembly boards, the main power board and
the display board. Both circuit boards are mounted inside a UL Type 1 (steel) or Type
4X (rain tight) enclosure.
Fig. 1. Internal Electronic Assemblies.
2.1 Main Power Board
Connections to this board include the MAIN Power Input and current sensors.The
MAIN Power Input terminals are positions one through four on the four position screw
terminal block, TB1. These terminals are covered with a protective shield for safety
purposes. The current sensor assemblies interface to TB2, TB3 and TB4. Each
terminal block corresponds to an input voltage phase; care must be exercised to
ensure that each current sensor is connected to the correct terminal block. One three
terminal screw connector is provided for RS-485 communications.
Fig. 2. Main Power Board Connections.
M33307
MAIN
POWER
BOARD
DISPLAY
BOARD
M33308
RS-485
MAIN
POWER
INPUT
CURRENT
SENSOR
INPUT

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2.2 Display Board
The display board connects to the main power board via a flex ribbon cable and the
board mounts on the inside of the housing door.
The Class 320 meter features a 4-line LCD display that indicates multiple meter data
points.
Fig. 3. Display Board.
M33279
DOWN UP SELECT MENU

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3.0 METER TECHNICAL SPECIFICATIONS
Ordering Information: Define brand, class, input voltage, amperage, protocol, and
sensor type in the format A-BB-CCC-DDDD-E-FFF-GGG, where:
A = Brand: H for Honeywell
BB = designates Class 320 (32), or Class 500 (50) meter
CCC = input voltage: (208, 400, 480, 600, 120 volt for High Voltage)
DDDD = current rating: (100, 200, 400, 800, 1600, 3200, 25HV)
E = enclosure: J = metal (type 1), R = non-metallic (rain tight) (type 4X), M = MMU
FFF= protocol: RTU = Modbus, BAC = BACnet, EZ7 = proprietary
“-SP”= Single or Two Phase
GGG = Sensors: KIT = split-core, SCS = solid-core, “blank” = none supplied
Brand Class Voltage Amperage Enclosure Communication Protocol Current Sensor/Option Current Sensor/Option Current Sensor/Option
Example H 32- 208 100- J RTU KIT
H32-208100-JRTUKIT
Brand Honeywell
Class 320
Voltage 120, 208, 400 (380-415), 480, 600
Amperage 2HV, 100, 200, 400, 800, 1600, 3200
Enclosure J (JIC Steel), I (Interior only), M (MMU Style), R (Rain tight)
Communication
Protocol
RTU (Modbus RTU), BAC (BACnet MS/TP), EZ7
Current Sensors/
Options
KIT (Split Core), SCS (Solid-Core), -SP (Single or Two Phase - 2
element)
Input Voltage
Configuration
3-wire (delta) Or 4-wire (wye)
Mains Voltage Input Up To 600 VAC RMS available
Input Power 6 VA maximum rating
Current Sensor
Rating
Up To 3200 amps RMS AC available
Power Factor 0.5 leading or lagging
Line Frequency 50-60 Hz
Metering Accuracy ANSI C12.20

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Temperature Range -20C to +50C
Relative Humidity
Range
0-95% non-condensing
Altitude 2000 meters maximum
Voltage Overload +25% continuously: +100% For 20 cycles
Current Sensor
Overload
100% for 1 minute
Pollution Degree Degree 2 in accordance with IEC 664
Standards EN 61326-1:2006 IEC 61010-1:2001, 2nd Edition
Installation
(Overvoltage)
Category
Category III
Measurement
Category
Category III
Enclosure Material Type 1 JIC steel or Type 4X Rain Tight
Display Readout LCD
Standard Ranges 2-Wire Delta 120 VAC: 100, 200, 400, 800,1600, 3200 Amp
4-Wire Wye 120/208 VAC: 100, 200, 400, 800,1600, 3200 Amp
3-Wire Delta 120/240 VAC: 100, 200, 400, 800,1600, 3200 Amp
4-Wire Wye 277/480 VAC: 100, 200, 400, 800,1600, 3200 Amp
2-Wire Wye 277 VAC: 100, 200, 400, 800,1600, 3200 Amp
4-Wire Wye 400 VAC: 100, 200, 400, 800,1600, 3200 Amp
3-Wire Delta 480 VAC: 100, 200, 400, 800,1600, 3200 Amp
4-Wire Wye 600 VAC: 100, 200, 400, 800,1600, 3200 Amp
RS-485 Serial
Communications
Cable
Cable: UL-listed/rated/3-conductor,
300 VAC, stranded
conductors, 22-26 AWG.
Input/output Voltage: Ground-isolated +/-5.4Vdc
Cable Connector: Screw terminal termination
Circuit Input Isolation: 5.3kVAC
Max Cable Distance: 4000 feet
Max Network Nodes: 64 cabling nodes (including
master)
Baud Rate: 9600, 19200, 38400, 76800
Recommended
In-Line Fuse
Manufacturer: Littlefuse
Mfg. Part No: KLDR.100
Rating: 100mA, time-delay, 600VAC
cartridge fuse

CLASS 320 METER
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Battery Cell: Description: Non-rechargeable cell used for
memory retention
Manufacturer: Panasonic
Mfg Part No: CR2032
Working Voltage: 3Vdc
Current Capacity 225 mAHr
Electrolyte: Manganese Dioxide Lithium

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4.0 SAFETY LABEL DEFINITIONS AND
INFORMATION
The 320 meter may contain one or more of the following labels. Operator(s) should
familiarize themselves with the meaning of each label to minimize risk.
FCC Notice
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver
- Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Standards Compliance:
BACnet MS/TP and IP protocol is BTL listed.
LonWorks TP/FT-10 protocol is LonMark® certified.
The presence of this label is a cautionary indicator identifying a
danger risk. The manual should be consulted prior to proceeding.
The presence of this label indicates an electrical shock hazard exists
in the location or area where the label is placed. Prior to proceeding,
the MAINS power must be disconnected and the manual consulted for
safety information.

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5.0 PRECAUTIONARY AND SAFETY
INFORMATION
CAUTION
Internal circuit card components are extremely sensitive to electrostatic
discharge. Be careful not to touch internal circuitry prior to discharging any
static buildup on your person. To discharge yourself, touch a grounded metal
object such as conduit or an earth-grounded metal enclosure.
WARNING
High voltages present on main PCB terminal block TB1 screw terminals. Risk
of serious injury and/or electrical shock exists. Prior to performing any wiring
operations, review all contents of the user manual and de-energize the MAINS
power switch. Only qualified personnel should perform installation wiring.
Installation wiring must comply with all local and national electrical codes.
WARNING
NEVER open front panel of unit while unit has MAINS power applied. Failure to
comply can increase the risk of serious injury and/or electrical shock.

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6.0 METER INSTALLATION
6.1 Mounting the Class 320 Meter
Fig. 4. Meter Dimensions.
Use appropriately sized mounting hardware to fasten the Class 320 enclosure to the
selected mounting surface. The four housing mounting holes are centered 6.75” H x 4”
W. When the meter is provided in the 4X rain tight plastic enclosure, the hub must be
mounted to the conduit first before connecting it to the enclosure.
NOTE: Units housed in UL type 1 steel enclosures must only be installed in indoor
locations, where they will not be affected by the elements.
M34684
6-35/64 (166)
6-35/64
(166)
5/8 (16)
7-51/64
(198)
3-17/64 (83)
1-5/8
(41)
3-25/64
(86)
Ø 1-3/32 (28) THROUGH
NEAR SIDE ONLY

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6.2 Main Power Board Connections
1. Installing a temporary ground for ESD protection: With all circuits de-energized,
connect a temporary protective earth ground connection for ESD protection.
Prior to performing any unit wiring, be sure to discharge any static on your per-
son.
2. Installing the Class 320 protective earth ground: Connect an earth ground wire
to the Class 320 (Type 1 enclosure) protective earth ground lug with a torque of
7 N-m.
WARNING
Failure to attach the protective earth ground wire securely to the meter creates
a potential shock hazard. Do not loosen or remove the screw securing the
ground lug.
Fig. 5. Main Power Board Connections.

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6.2 Main Power Board Connections (continued)
3. Wire Entry: One 3/4” conduit opening is located on the bottom of the CL320
enclosures. This opening is used for bringing in MAINS power and for current
sensor wiring. One 1/2” conduit opening on the top of the metal enclosure
CL320 can be utilized as an interface for the low- voltage signals, pulse input, or
RS-485 communications wiring to the unit. CL320 meters are available in an
MMU (Multiple Meter Unit) enclosure that holds eight (8) meters (see MMU
installation manual for additional details).This enclosure comes without knock-
outs and allows the user to choose entry points for the wiring.
Any unused openings must be sealed with a UL rated plugging device or hub
suitable for the rating of the enclosure - such as NEMA 1 or 4X
.
4. Unit MAINS wiring:
The four positions on terminal block TB1, located at the bottom left corner of the
main power board, are clearly labeled Phase A, B, C, N (neutral). Earth Ground
MUST be connected to the PCB mounting screw in the lower right corner.
A. Connect the NEUTRAL wire to the appropriate terminal block position.
Fig. 6. Terminal Block TB1, TB2, TB3, and TB4.
NOTE: For 3-wire delta-type applications, do NOT connect the NEUTRAL wire.
Remove the terminal block screw for this position.
B. Earth Ground
Connect the Earth Ground to the PCB mounting screw in lower right corner.
C. External Switch Mechanism/In-Line Fuse Installation
To ensure a safe installation, the Class 320 meter requires an external switch
mechanism, such as a circuit breaker, be installed on the meter’s MAINS
input wiring. The switch mechanism must be installed in close proximity to
the meter and easily reachable for the operator. This device must also be
marked as the disconnecting device for the Class 320 meter. 1/10 Amp Slow
Activation in line fuses (KLDR.100, UL listed, Littelfuse rated 600V/100ma)
must be installed for each conductor phase at the MAINS input to the meter.
The fuses must be labeled to indicate voltage and current rating as well as
element characteristics.The fuse element must be slow activating type.

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6.2 Main Power Board Connections (continued)
D. Connect the three AC main power wires (Phases A, B and C) to their respec-
tive positions as labeled on terminal block TB1. After all conductors are con-
nected to each of their respective terminal block positions and tightened to 7
in-lb, verify that each terminal block screw is securely fastened by gently tug-
ging on each conductor. Verify that no conductor wires are frayed or shorting
to adjacent terminal block positions. For single phase connection: connect
two ac main power wires to phases a and b and a jumper wire from b to c -
factory installed for the Single Phase option.
E. Turn ON the AC main power input. The meter display will light up and scroll
through 6 displays. Each display is visible for 5 seconds. Display screens are
as follows:
Screen 1 - Total kilowatt-hours (kWh) consumed
Screen 2 - Peak demand (kW) with date & time stamp
Screen 3 - Actual load (kW)
Screen 4 - RMS Amps
Screen 5 - RMS Volts Phase to Neutral
Screen 6 - RMS Volts Phase to Phase
Screen 7 - Power factor (PF) per phase
F. Verify the voltage readings on Screen 5 using an AC voltmeter. Typical read-
ings shown below are measured phase to neutral (L-N) for 4 wire and phase
to phase (L-L) for 3 wire. Readings should be +/- 10% of nominal.
NOTE: Meters are powered by phases A and B. The displayed voltages will be the
measured AC voltage between phases.
Meter Type Nominal Voltage Limits (+/- 10%)
120/208V, 3ø, 4 Wire
120/240V, 1ø, 3 Wire
120V, 1ø, 2 Wire
120 VAC (L-N) 108 to 132 VAC
277/480V, 3ø, 4 Wire
277V, 1ø, 2 Wire
277 VAC (L-N) 249 to 305 VAC
240V, 3ø, 3 Wire 240 VAC (L-L) 216 to 264 VAC
400V, 3ø, 4 Wire
(380V, 400V, 415V)
230 VAC (L-N) 207 to 253 VAC
480V, 3ø, 3 Wire 480 VAC (L-L) 432 to 528 VAC
600V, 3ø, 4 Wire (WYE
only)
347 VAC (L-N) 312 to 380 VAC

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6.3 Phasing of Line Voltage
The 3-phase AC power input or single phase option must be in proper phase
sequence. If the sequence is incorrect or a phase is missing, there will be a message
on the meter’s display: “PH Sequence Error” or “PH Missing:. (Refer to the section on
Line Voltage Diagnostics if this message is present.) When the line voltage is
connected correctly, the meter’s display will be blank (no message.)
Wait for the 4-line meter display to scroll to the voltage display. Verify that the meter
reads correct voltages on all three phases. Repeat Step 6.2.4F.
Once the meter displays the correct line voltages and there are no error messages,
you are ready to connect the current sensors to the meter. Before continuing with the
installation, verify that the six screens display as follows:
Screen 1 (kWh): Should read 0.0 kWh; if not, should be reset.
Screen 2 (kW Peak Demand): kW peak should read 0.0 kW. There will not
be a date/time stamp yet. If there is a kW
peak recorded, it should be reset later.
Screen 3 (kW Load): Should read 0.0 kW load.
Screen 4 (Amps per Phase): There should be 0.0 on all three phases. Or
in the Single Phase option - 0.0 in A and B
phases.
Screen 5 (Volts RMS Phase to Neutral): See the section 6.2.4.F.
Screen 6 (Volts RMS Phase to Phase): See the section 6.2.4.F.
Screen 7 (Power Factor Per Phase): There should be 0.0 PF on all three phases.
Or in the Single Phase option - 0.0 in A and B
phases.
NOTE: The meter will be reset later via the software during “startup” procedures.

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6.4 Current Sensor Installation & Wiring
Once the AC voltages have been confirmed to be within acceptable limits, you are
ready to install the current sensors. TB2 is the input for Phase A, TB3 is the input for
Phase B and TB4 is the Phase C input. For the Single Phase option: use TB1 pos 5&6
are for the A Phase - TB1 pos 7&8 are for the B phase -factory installed jumper wire on
positions 9&10. Factory installed Jumper should not be removed.
The Class 3200 meter is supplied with two types of 0-2V split or solid-core
current sensors (specified when ordered):
1. Split-core current sensor. This sensor opens so that it can be attached around
the circuit being monitored without interrupting power.
2. Solid-core current sensor. This sensor does not open and requires the monitored
conductor to be removed from the circuit to install the current sensor. This type is
only supplied when specified at time of order.
6.4.1 Installing the Split-Core Current Sensor Assembly
1. Each phase being monitored will require one two-piece current sensor assembly.
Open the two-piece current sensor assembly by releasing the nylon clamp using
a flathead screwdriver.
Fig. 7. Split Core Sensor.
2. Reassemble the current sensor assembly around the conductor(s) to be moni-
tored. Ensure the current sensor halves marked “Load” are both facing the load
side of the conductor. The colored arrow will be on the source side of the con-
ductor being monitored and MUST be pointed in a clockwise direction around the
conductor being monitored. Tighten the nylon clamp to complete the assembly.
Fig. 8. Split Core Sensor.
IMPORTANT:
When looking from the source side of the conductor(s) being monitored, you
should see the arrow on the current sensor assembly. The arrow should be
pointing in a clockwise direction around the conductor(s) being monitored. If
the arrow is not positioned on the source side, inaccurate readings will result.
M33213
LOAD
SOURCE

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6.4.1 Current Sensor Wiring
Once the current sensors are installed onto their appropriate phase conductors, you
can begin terminating the current sensors onto the Class 320 main board. The current
sensors can be extended up to 500 feet for remote monitoring applications. To extend
the length of the wires, use #22 AWG twisted-pair wire with one white and one black
wire.
The easiest way to connect the current sensors is to use the meter’s built-in current
sensor diagnostics. To do this, there must be at least 1% of the meter’s current rating
(amps) flowing in each of the conductors being monitored. The Class 320 meter’s
diagnostic program (on the 4-line display) will provide data to ensure that the current
sensor installation is done properly.
The current sensor connection points are located at the bottom right of the main power
board. These are TB2, TB3, and TB4. Each sensor connects to two terminals one
labeled “Black” and the other “White.” Current sensors should be connected to the
meter one at a time and verified using the current sensor diagnostic program.
Connect one of the current sensors to the TB2 terminals (Phase A). Tighten the
terminal to 4.5 in-lb. Wait 5 seconds and look at the meter display.
If the meter displays an error message (see below), remove the wires from TB2 (Phase
A) and install them on TB3 (Phase B). if an error message occurs with the sensor
attached toTB3, try again on TB4 (Phase C). The wiring will be correct when the error
indication message is gone.
NOTE: If the power factor being monitored is <65%, the error message may be acti-
vated until improved. This is normal and indicates poor power factor.
The “CT Error: * “message will disappear when the current sensor is connected to the
correct terminals (phase).
Error Messages: CT ERROR: A
CT ERROR: A B
CT ERROR: A C
NOTE: The Single Phase option will only display errors for A and B.
Refer to the section on Current Sensor Diagnostics for assistance in troubleshooting
these errors.
6.4.2 Main Power
After the meter circuit wiring has been examined for correctness, power may be
applied to the circuit board. There are three LEDs located in the upper right corner of
the Meter Board labeled BEAT, STATUS and LOAD. The BEAT and STATUS LEDs will
blink once per second when the meter is operating normally, twice per second if there
is a problem.If the monitored circuit is under load the LOAD LED will actively blink. A
heavy load will cause the LED to blink faster than a light load. Very light loads will
result in an extended blink time.

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6.5 Main Power & Current Sensor Wiring Diagram
Fig. 9. 3-phase- 4 Wire Installation Diagram
Fig. 10. Single-Phase, 3-Wire, Installation Diagram
A B
LINE VOLTAGE CURRENT SENSORS
A
N
B
LOAD SOURCE
M34642
3-PHASE, 4-WIRE INSTALLATION DIAGRAM
NOTES:
LINE VOLTAGE CONNECTIONS: #14-22 AWG
SENSOR CONNECTIONS: B = BLACK LEAD W = WHITE LEAD
NEUTRAL NOT USED IN DELTA SYSTEM. REMOVE NEUTRAL TERMINAL
BLOCK SCREW FOR DELTA SYSTEMS.
1/10A 600 VAC INLINE FUSE PER CONDUCTOR. LITTLEFUSE PART
NUMBER KLDR, 100.
1
11
C
1
C
A B C W B W B
NW B
LINE VOLTAGE CURRENT SENSORS
N
LOAD SOURCE
1
11
2
C
W B W B
NW B
2
3
3
4
3
4

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6.6 Line Voltage/Current Sensor Diagnostics
Following is a list of diagnostic messages that may appear on the meter display.
DIAGNOSTIC MESSAGES SHOULD NOT BE ON CONTINUOUSLY WHEN THE
METER IS INSTALLED PROPERLY AND IS IN WORKING ORDER.
6.6.1 Line Voltage Diagnostics
The diagnostics program detects line voltage faults by displaying one of two
messages:
PH Missing: B C or Phase sequence error.
Missing: B C: Indicates that the line voltage is missing on Phase B and/or Phase C.
This message will appear whenever the power on either Phase B or Phase C is off.
Screen 5 (Voltage per Phase) will also indicate a loss of line voltage.
Phase sequence error : Indicates that the Single Phase or the 3-phase line voltage is
not hooked up in the proper phase sequence. This message should never be seen
continuously on the display during normal operation. The meter will not display correct
electrical data in this condition. The phase sequence problem must be remedied in
order for the meter to work properly.