Measurlogic DTS 307 User manual

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DTS 307
DIN –Rail Mounted, Ultra-Compact
Revenue Grade Electrical Sub-meter

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1PRODUCT OVERVIEW ........................................................................................................................................................ 3
1.1 SUPPLIED ITEMS ..................................................................................................................................................................... 4
1.2 DOCUMENT CONVENTIONS ...................................................................................................................................................... 4
1.3 PRODUCT SPECIFICATION ......................................................................................................................................................... 5
1.3.1 Current Inputs ............................................................................................................................................................ 5
1.3.2 Service Type ............................................................................................................................................................... 5
2INSTALLATION ................................................................................................................................................................... 6
2.1 ENVIRONMENT....................................................................................................................................................................... 6
2.2 SAFETY GUIDELINES ................................................................................................................................................................ 6
2.3 PRODUCT DIMENSIONS............................................................................................................................................................ 7
2.4 MOUNTING REQUIREMENTS AND GUIDELINES.............................................................................................................................. 7
3CONNECTING TO THE DTS 307 ........................................................................................................................................... 9
3.1 WIRING VOLTAGE AND CURRENT INPUTS .................................................................................................................................... 9
3.1.1 Wiring Examples ........................................................................................................................................................ 9
3.2 CONNECTING MULTIPLE LOADS............................................................................................................................................... 11
3.3 AUXILIARY POWER................................................................................................................................................................ 12
4DTS 307 COMMUNICATIONS INTERFACE ......................................................................................................................... 13
4.1 RS-485 2-WIRE COMMUNICATIONS ....................................................................................................................................... 13
4.2 KWH PULSE OUTPUT (MODEL DEPENDENT).............................................................................................................................. 14
5LED DEFINITIONS ............................................................................................................................................................. 14
5.1 STATUS LED........................................................................................................................................................................ 14
5.2 REMOTE LED....................................................................................................................................................................... 15
6INSTALLATION OF DTS CONFIG AND MONITORING SOFTWARE....................................................................................... 15
7MAINTENANCE AND SERVICE .......................................................................................................................................... 15
7.1 CLEANING INSTRUCTIONS ....................................................................................................................................................... 15

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1PRODUCT OVERVIEW
The One Revenue Grade Meter for all Applications.
Our DTS 307 or DTS 307/1 energy sub-meter is one of the most versatile meters available on the market.
The standard DTS 307 is a full 3-Phase measurement RGM. If only a single phase 2-Wire system needs to be
measured, the single channel DTS 307/1 is also available.
The DTS 307 can operate in any environment, requires no external power source to operate, and works with all
UL or ETL listed 333mV current transformers.
For ease of installation, the DTS 307 is designed to be ultra-compact and fit into most DIN-rail systems.
Some of the exciting features provided with the DTS 307 are
•Easy to attach pluggable terminals
•Modbus RTU or BACnet MS/TP depending on model
•Auto-topology Phase Detection
•Automatic correction of reversed field mounted CTs
For remote configurability, your DTS 307 comes with our freely downloadable DTS Config software tool
The DTS 307 is certified to ANSI C12.20 Class 0.5 Revenue Grade.
Also, if in the future, you decide to integrate renewable energy sources, the DTS 307 will conveniently operate as
a Bi-Directional NET meter. Easily integrates with Building Automation Systems and Energy Monitoring Software.
Designed and Manufactured in the USA and complies with the Buy American Provisions of ARRA Section 1605.
Thank you for choosing Measurlogic and a meter from the DTS Family.
NOTE
Both the DTS 307 and DTS 307/1 variations will be
generically referred to as the “DTS 307” in this document,
except where it is important to distinguish between the two models.

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1.1 Supplied Items
Check that the meter and equipment matches your order specifications and has not been damaged during
shipping. Verify that the following item(s) match with the corresponding model from the data sheet:
•Installation Guide
•DTS 307 power & energy meter
•10-Pin green pluggable screw terminal connector for Voltage and Aux Power/Digital Output
•6-Pin green pluggable screw terminal connector for Current inputs
•3-Pin green pluggable screw terminal connector for Remote RS-485 Communications
1.2 Document Conventions
SYMBOLS
ATTENTION –PLEASE CONSULT THE
INSTALLATION MANUAL
WARNING –RISK OF ELECTRICAL
SHOCK

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1.3 Product Specification
WARNING
Measurement Category III
DTS 307 is intended for 480V L-L use
DTS 307/1 is intended for 240V L1-L2 use
Do NOT exceed this usage
Use the model number of the DTS 307 to verify that it is suitable for the
voltage, type and category of the installation.
Failure to use the correct CT’s, and/or connecting too high a voltage can result in
death or personal injury and may permanently damage the DTS meter.
The model number for the normal three-phase DTS 307 is:
DTS 307 - Ax-xx-x-F
For applications where only single channel measurements are needed, the model number is:
DTS 307/1 - Ax-xx-x-F
1.3.1 Current Inputs
Current
Inputs
Value
Description
Notes
A
3
333mV CT
Any 333mV CT is acceptable
9
Rope CT
Only use the CT’s that came with the unit
1.3.2 Service Type
Service Type
Value
Description
Neutral Required
Neutral Optional
F
N
(1P 2W, 1P 3W, 3P 4W) 120 –277Vac L–N
●
2
(3P 3/4W) 208 –240 Vac L–L (for DTS 307)
(1P 2W) 120 –277 Vac L1–L2 (for DTS 307/1)
●
A
Any of the above services (See 3.3 for details)
●

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2INSTALLATION
2.1 Environment
Operating Temperature: -31oF to 158oF (-35oC to 70oC)
Storage Temperature: -40oF to 185oF (-40oC to 85oC)
Relative Humidity: 5% to 95% (non-condensing)
Operating Altitude: Up to 2,000m
2.2 Safety Guidelines
WARNING
The following installation instructions are intended for qualified personnel only. To
reduce the risk of electrical shock and personal injury, do not perform additional tasks not
stated in this procedure unless you are qualified to do so.
Always adhere to the following safety guidelines:
•Only qualified personnel or licensed electricians should handle the installation. Input voltages to
the DTS 307 can be hazardous.
•Follow all applicable local and national electric codes.
•Verify input voltage and current are within thresholds for the specific DTS 307 model. (See Product
Specification on page 5)
•Only Current Transformers that are listed to UL 2808 for use in 250Vac or 600Vac line-
to-line circuits (as appropriate for the installation) may be used with this meter.
•ONLY USE CURRENT TRANSFORMERS WITH OUTPUTS THAT ARE COMPATIBLE WITH THE
MODEL OF DTS 307 (SEE SECTION 1.3.1). THE USE OF ANY OTHER CURRENT
TRANSFORMER CAN RESULT IN PERMANENT DAMAGE TO THE DTS 307.
•Avoid any electrostatic discharge prior to working on the DTS 307 by first touching a grounded
structure prior to handling the DTS 307.
•Before applying power make sure that all current transformer and voltage connections are securely
connected to the input terminals of the DTS 307.
•If the DTS 307 is installed incorrectly any built-in safety features may no longer be functional.
•Before handling the DTS 307 ensure that all power running to the DTS 307 is removed.
•The DTS 307 MUST be mounted in a NEC compliant enclosure suitable for the application’s
environmental conditions.
•The DTS 307 may be used outdoors if housed in an outdoor rated enclosure that prevents water
ingress, such as a NEMA Type 3R / IP14 or higher that is suitably rated for the application.
•The enclosure must be equipped with a user supplied lock or other means to prevent unauthorized
access.

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2.3 Product Dimensions
2.4 Mounting Requirements and Guidelines
WARNING
To reduce the risk of electric shock, always open or disconnect circuit from power
distribution system (or service) or building before installing or servicing the meter and/or
its current transformers.
When mounting the DTS 307 make sure to follow these guidelines:
•Always open or disconnect circuit from power distribution system (or service) or building before
installing or servicing the meter and/or its current transformers.
•Mount the DTS 307 as close as possible to the electrical panel being monitored.
•Make sure that there is at least 4” of clearance above and below the DTS 307 for wiring and
connector clearance and ¼” of clearance on both sides for cooling.
•Position the DTS 307 such that the labeling can be read from the upright position.
•Only UL or ETL rated conduits and glands should be used.
•It is recommended that two separate conduits be run for voltage and current connections.
•Use Copper Conductors ONLY.
•Only Current Transformers that are listed to UL 2808 for use in 250Vac or 600Vac line-to-line circuits
(as appropriate for the installation) may be used with this meter.
•The Current Transformers may not be installed in equipment where they exceed 75% of the wiring
space of any cross-sectional area within the equipment.

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•Restrict installation of Current Transformer in an area where it would block ventilation openings.
•Restrict installation of Current Transformer in an area of breaker arc venting.
•Not suitable for Class 2 wiring methods. Not intended for connection to Class 2 equipment.
•Secure Current Transformers and route conductors so that they do not directly contact live terminals
or busses.
•User Supplied UL or ETL certified 2A fast-blow fuses need to be installed between the Voltage
inputs of the DTS 307 and panel being monitored. Recommended Littelfuse BLS002 or equivalent.
•14 to 12 AWG wire should be used for the voltage and ground with 300V or 600V insulation
depending on installation type and according to the table below.
•A UL or ETL certified 600V circuit-breaker or equipment switch must be installed as a disconnecting
device for the DTS 307, and must be positioned within easy reach of the DTS 307. The circuit-
breaker or equipment switch employed for this disconnecting device shall meet the relevant
requirements of IEC 60947-1 and IEC 60947-3, be suitable for the application, and MUST be clearly
marked as being “the disconnecting device” for the DTS 307. See table below for the breaker
and wire gauge to use.
WIRE & BREAKER GUIDE
Gauge of Wire
Recommended Breaker
14 AWG
15 Amp 600V 3-Pole Breaker
12 AWG
20 Amp 600V 3-Pole Breaker

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3CONNECTING TO THE DTS 307
3.1 Wiring Voltage and Current Inputs
3.1.1 Wiring Examples
ATTENTION
Examine the model number of each of your meters to
ensure that they are suitable for the type and voltage of
the service you are connecting to. See section Error!
Reference source not found. for details.
Note: CTs should be connected to the same panel as the
voltage connections.
A
N
B
C
A
N
B
C
Load→
DTS 307
3-Phase with Optional Neutral
(Model Dependent)
Load→
A
B
C
DTS 307
Single Phase 2/3 Wire
A
B

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L1
L2
Load→
DTS 307/1
Single Phase 2-Wire ONLY
L1

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A
B
C
Load 1
A
N
B
C
A
B
C
Load 2
3.2 Connecting Multiple Loads
The DTS 307 allows for ease and flexibility when monitoring multiple branches. The DTS 307 allows multiple CT
sensors to be connected in parallel via the green pluggable screw terminal.
When using parallel CT sensors, the following guidelines must be followed to ensure accurate measuring.
•All CT sensors must have a 333mV output.
•All CT sensors must be of the same manufacturer/model number and current rating.
•A full set of CT sensors must be used for each load.
•The pair of wires from the CT sensor to the green pluggable screw terminal must be twisted.
•All CT sensors must be terminated at the green pluggable screw terminal.
•A maximum of 3 loads can be monitored at once (Contact Measurlogic if more than 3 loads must be
monitored).
•The measured phase current will be the total current across all the loads on that phase.
•The CT primary rating for the DTS 307 must be set to the CT rating * Number of CT sets.
•The example below shows how to calculate the service current for figure 3.2.1.
Service Current for Figure 3.2.1
Number of CT Sensor Sets
2
CT Rating
100 Amps
CT Primary
200 Amps
Figure 3.2.1

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3.3 Auxiliary Power
ATTENTION
DTS 307 meters that have an “A” in the Service Type field of the model
number (as shown in section 1.3.2) require an external 24Vac/dc
auxiliary power supply to operate.
A separate IEC 60950 compliant isolated 24Vac/dc power supply
MUST be used to power these meters.
•Connect the external IEC 60950 compliant isolated power supply to the two 24Vac/dc terminals on the
DTS 307 meter as shown on the meter label and in the diagram below.
•For clarity, the meter voltage terminal and the CT sensors connections are not shown on the diagram
below. Please see sections 3.1 and 3.2 for these connection details.
IEC 60950 Compliant
Isolated Power Supply
G G0

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4DTS 307 COMMUNICATIONS INTERFACE
SAFETY WARNING
Ensure that all external devices that are connected to either or both of the
RS-485 communications bus, and/or the digital solid state relay output
have been certified to be IEC 60950 compliant.
The DTS 307 has 3 options for outputting data depending on the model ordered:
•Modbus RTU over a 2-Wire RS-485 bus
•BACnet MS/TP over a 2-Wire RS-485 bus
•A kWh Energy Pulse Output through a Potential-Free Normally Open (N.O.)
Solid State Relay (SSR).
Do NOT use this output to switch more than 50Vdc.
4.1 RS-485 2-Wire Communications
RS-485 is a Daisy Chained Bus terminated at both ends with 120 Ohms.
DO NOT use a STAR or RING configuration.
•Use 18-22 AWG, 2-core, shielded, twisted pair cable
•When fitted with Modbus RTU, unless otherwise specified through correspondence prior to ordering, the
default Modbus RTU communications parameters are as follows:
oModbus Address: 100, Baud Rate: 9600, Parity: None, Data Bits: 8, Stop Bits: 1
(9600, N, 8, 1 #100).
•Modbus parameters can be changed either through DTS Config or by writing to specific registers in the
meter. Please see the Modbus Map document or section 7 for DTS Config.
•When fitted with BACnet MS/TP, unless otherwise specified through correspondence prior to ordering, the
default BACnet MS/TP communications parameters are as follows:
oDevice Object ID: 473001, MAC Address: 1, Baud Rate: 38400
BACnet MS/TP requires Parity: None, Data Bits: 8, Stop Bits: 1
•BACnet parameters must be changed via the BACnet interface.
RS-485 2-Wire
+ to +
-to -
S to S

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Digital Input module
or Counter
4.2 kWh Pulse Output (Model Dependent)
•The DTS 307 comes with a Digital I/O port that can be configured for pulse outputs.
•The DTS 307 will pulse at 1kWh by default but can be changed using DTS Config.
•The relay closure of each pulse will last for 100ms (pulse width) with a minimum delay
of 100ms between any two pulses. The maximum switching voltage is 50Vdc.
5LED Definitions
The DTS 307 is equipped with 2 LEDs useful for diagnostics and troubleshooting –STATUS and REMOTE.
5.1 Status LED
•The STATUS LED consists of a repetition of two flashes and shows whether the measured power is being
consumed/imported or generated/exported, as well as the magnitude of the total current.
•The First Flash is the “heartbeat” and indicates that the meter is ON and the direction of energy:
•The Color and Length of the Second Flash indicates the “total current level” for all the measured phases
relative to the total service current:
oGREEN for 5-80% of total service current
oORANGE for 80-100% of total service current
oRED for >100% of total service current
Relative
Illustration of the Repeating Status LED Sequence for Heartbeat and Relative Measured Current Level
Current
Level
|

Heartbeats are approximately 2 seconds apart
→
|
Time
→
%
|
|
50%
HB
HB
80%
HB
HB
>100%
HB
HB
Green –Energy is being
consume/imported
Orange –Energy is being
generated/exported

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5.2 Remote LED
•The REMOTE LED is a communications indicator which is present on all meters fitted with an RS-485
serial port.
•The LED will flicker GREEN when the DTS 307 receives data on the BUS and AMBER when the DTS 307
transmits data in response.
6INSTALLATION OF DTS CONFIG AND MONITORING SOFTWARE
•DTS Config is a program used to easily monitor and configure meters from the DTS family from your local
PC or across the LAN.
•Download the latest version of DTS Config from https://www.measurlogic.com/software-drivers/.
Alternatively, an e-mail can be sent to [e-mail] to request the latest version of DTS Config.
•Unzip the DTSConfigSetup file and double click the setup.exe file to begin the installation process.
•Follow the instructions on the screen.
7MAINTENANCE AND SERVICE
WARNING
There are NO other user serviceable parts in the DTS 307, and no regular maintenance is
required. If additional maintenance is needed, please contact Measurlogic Inc.
7.1 Cleaning Instructions
Regular cleaning of the DTS 307 is NOT required, but if you do wish to clean the DTS 307, please note the following:
•Before attempting to clean the DTS 307 ensure that all power running to the DTS 307 is removed.
•Use only a slightly damp cloth to clean the outside of the meter only.
•Do not use any harsh chemicals or detergents.
•No water or any other liquid must be allowed to enter the meter.
•Do not use a spray bottle.
Green –Data being received
Amber –Data being transmitted