NRG Systems LOGR-S User manual

LOGR-S Manual | 11/5/2021| 1

NRG Product Manual
LOGR-S Data Logger
NRG_LOGR-S_Manual
Rev. 1.0
[e-mail] | Page 2
5 November 2021
TABLE OF CONTENTS
SECTION 1 | INTRODUCTION ................................................................................................................................................... 4
About This Manual ...................................................................................................................................................... 4
Typographic Conventions............................................................................................................................................. 4
Quick Start................................................................................................................................................................... 5
Getting Help ................................................................................................................................................................ 6
Product Overview........................................................................................................................................................ 7
Data............................................................................................................................................................................... 8
Communications ............................................................................................................................................................ 8
Concept of Operation ..................................................................................................................................................... 8
Channels ........................................................................................................................................................................ 9
Precautions.................................................................................................................................................................. 9
Environmental Considerations........................................................................................................................................ 9
SECTION 2 | SYSTEM OVERVIEW ............................................................................................................................................10
Unpacking LOGR.........................................................................................................................................................10
Components Map .......................................................................................................................................................10
Power Source .............................................................................................................................................................12
SECTION 3 | PRE-INSTALLATION PREPARATION......................................................................................................................13
Connecting through the Ethernet port ........................................................................................................................13
Network Settings Configuration..................................................................................................................................14
Configuring the IP Address ............................................................................................................................................14
Modbus RTU .................................................................................................................................................................16
NTP Server ....................................................................................................................................................................17
System Configuration .................................................................................................................................................18
Site Properties...............................................................................................................................................................18
Date and Time...............................................................................................................................................................19
System Info ...................................................................................................................................................................19
Channel Configuration & Data Collection....................................................................................................................20
Analog Sensors..............................................................................................................................................................20
Analog Channel Configuration.......................................................................................................................................21
Modbus RTU Serial Sensor Configuration ......................................................................................................................24
Serial Port Configuration...............................................................................................................................................24
Serial Channel Configuration.........................................................................................................................................25
PV Soiling Configuration................................................................................................................................................28
Sensor Configuration Reset.........................................................................................................................................29
Data Storage...............................................................................................................................................................30
Firmware Updates ......................................................................................................................................................30
FTP .............................................................................................................................................................................32
Command Files..............................................................................................................................................................32
Command File Options ..................................................................................................................................................33
Diagnostics .................................................................................................................................................................36
Control Diagnostics .......................................................................................................................................................36
Analog Diagnostics .......................................................................................................................................................37
Excitation Status ...........................................................................................................................................................37
Status Registers ..........................................................................................................................................................38
SECTION 4 | FIELD INSTALLATION...........................................................................................................................................39
Grounding & Lightning Considerations........................................................................................................................39
Mounting....................................................................................................................................................................40
Required Tools............................................................................................................................................................41
Sensor Connections ....................................................................................................................................................41
Routing Sensor Cables into the Shelter box....................................................................................................................41
Connecting Sensor Wires to LOGR .................................................................................................................................42

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Wiring Map...................................................................................................................................................................43
Logger Data Acquisition..............................................................................................................................................45
Data File Transfer..........................................................................................................................................................45
File Types ......................................................................................................................................................................47
File Transfer Schedule ...................................................................................................................................................47
File Export .....................................................................................................................................................................48
SECTION 5 | COMMUNICATION & DATA.................................................................................................................................49
Modbus ......................................................................................................................................................................49
Network & Data Flow....................................................................................................................................................49
Demo Client ..................................................................................................................................................................50
Modbus Map.................................................................................................................................................................50
Export File Format ......................................................................................................................................................51
SECTION 6 | POWER SYSTEMS................................................................................................................................................56
Powering the LOGR Logger .........................................................................................................................................56
Powering Sensors .......................................................................................................................................................56
Grid-Tied Power Systems............................................................................................................................................56
Autonomous Power Systems ......................................................................................................................................56
APPENDIX A | TECHNICAL SPECIFICATIONS.............................................................................................................................57
APPENDIX B | MODBUS MAP .................................................................................................................................................59
APPENDIX C | DECLARATION OF CONFORMITY.......................................................................................................................69
APPENDIX D | WARRANTY .....................................................................................................................................................71
Sending Items for Repair ...............................................................................................................................................71
APPENDIX E | REFERENCES.....................................................................................................................................................73

NRG Product Manual
LOGR-S Data Logger
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SECTION 1 | INTRODUCTION
About This Manual
This manual is organized to provide a system overview followed by more detailed configuration and
installation instructions.
Typographic Conventions
This type style is used for the general body of this manual.
Instructions in Bold type direct you to perform an operation on screen.
This style is used to warn users of a potential danger, either to themselves or to the equipment/data.
Note- This style is used to indicate a tip or an important note.
This symbol indicates information that is critical to understanding the
operation of the equipment and/or actions that could damage the
equipment without endangering the user.
This symbol indicates a hazard to the user, the equipment, or both
that could result in serious injury or damage.
This symbol indicates a serious hazard to the user that could result in
death or dismemberment.
This symbol indicates an electrical hazard to the user.
This symbol indicates a hot surface hazard to the user, the
equipment, or both.
This symbol indicates an ESD hazard to sensitive equipment.

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Quick Start
The basic steps necessary to start receiving data from your LOGR system are as follows:
1. Connect
•16 to 28 V DC power supply (4 A max) to power terminals
•Ethernet cable from computing device to LOGR Ethernet port
2. Open a web browser and connect to the LOGR default IP Address via URL: IP address/index
3. Configure FTP Server (optional feature)
4. Update LOGR firmware
5. Configure:
•Static IP Address (Logger > Network Settings)
•Site name, project name, location details (Logger > System Configuration)
•Time Zone setting (Logger > System Configuration)
•NTP server (Logger > Time Synchronization, optional)
•Channels for the sensors you wish to connect (Sensors menu)
•FTP settings (Logger > File Transfer Settings, optional)
6. Save
7. Update LOGR firmware, if indicated.

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Getting Help
NRG Systems offers a variety of support options to help you get the most from your NRG product. If you
have questions about your NRG product, first look in the product documentation on the NRG website
(https://www.nrgsystems.com/products/solar-data-loggers/detail/logr-s-data-logger/).
If you cannot find the answer, contact your salesperson or NRG Systems Technical Support for assistance
using the information below. Customer support is available 8:30 AM to 5:00 PM ET, Monday through
Friday.
Telephone: [phone] ext. 3
Fax: [phone]
Email: [e-mail]
When you call or email, please have the appropriate product documentation and the following
information:
•Customer name
•Who purchased equipment
•Item number or description
•Serial number(s)
•When equipment was purchased
•Where equipment is installed including terrain and climatic conditions
•Description of the problem with some detail
•What events took place leading up to the problem
•What you have tried while attempting to solve the problem
You may be asked to provide data files or logs to help us investigate an issue. All information and data
provided are kept strictly confidential.
NRG Systems maintains an extensive website which includes an in-depth customer support area. If you
need assistance at times other than our regular business hours, we suggest visiting our website,
www.nrgsystems.com.
All instruments, sensors, software, and towers manufactured by NRG Systems are designed to be
reliable and easy-to-use. We welcome your comments and appreciate your help in making our products
the best available.

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Product Overview
Designed specifically for the renewable energy industry, the NRG LOGR Data Logger (introduced
September 2021) is a versatile, high-utility data logger and real-time sensor interface designed for post-
construction solar resource monitoring applications (e.g., performance monitoring and forecasting).
Powered by 16 to 28 V DC, this compact DIN rail-mountable logger is compatible with a wide range of
industry-standard (Modbus RTU and analog) sensors, with onboard dedicated PV soiling inputs
supporting PV soiling studies.
Configuration is performed by connecting directly through the LOGR’s Ethernet port and using the
internal web interface to navigate and save channel configurations, update firmware, and check basic
functionality. No proprietary configuration software is required, and a Modbus client utility is provided
to test final configurations.
Data are acquired once per second and averaged into 1-minute intervals; intervals are time stamped
with the beginning time of each interval. A comprehensive Modbus register set provides users easy
access via Modbus TCP or RTU.
Internal storage holds 90 days of 1-second data to backfill SCADA systems. The onboard FTP client
moves ASCII data files from the logger onto a user specified FTP server via the Local Area Network,
allowing SCADA operators to continuously gather and collect backup data. The user can also load
configuration “command” data onto the FTP server, which the LOGR will retrieve and apply (firmware
updates, logger configuration, sensor configuration, reboot, etc.).
A comprehensive analog sensor section is capable of up to 7 differential or 14 single-ended
measurements (or a combination thereof) and provides (12 V) sensor excitation ports as well as current
source excitation for RTDs and thermistors. Also included is built-in surge and ESD protection, tested to
IEC 61000-4-5 for surge immunity.
An expanded serial sensor section can support up to 12 Modbus RTU sensors and up to 24 measurands
in total. Data collection via Modbus registers is available for both one second and statistical (average,
max, min, and standard deviation) measurements.
Labeled terminal ports with removeable connectors facilitate error-free installations and maintenance.
For quality traceability, a factory acceptance test report is available for each individual logger.

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Data
LOGR data acquisition provides for:
•1 Hz sampling rate
•Statistical data, processed at 1-minute intervals
•Data storage via internal 8 GB microSD card
•FTP Client
Communications
•Ethernet port to access built-in webserver and Modbus data retrieval
Concept of Operation
LOGR requires network infrastructure support to operate as a sensor-to-SCADA interface:
•Modbus Client (SCADA system to poll LOGR)
•Web Browser (for configuration of LOGR, e.g., Google Chrome)
Optionally, the LOGR utilizes:
•Local FTP Server (LOGR will deposit data/diagnostic/event log files if needed for backup
purposes)
•Local FTP Client (for Administration of LOGR, such downloading/uploading unit or sensor
configurations)
•Local NTP Server (LOGR will time synchronize once daily if a local NTP server is provided)

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Channels
Below is a summary of available measurement channels on LOGR Data Logger | PV:
Channel Type
Channel Count (Capacity)
Channel Number Range
Analog*
14
1 to 14
Serial
24
101 to 124
PV Soiling Ratio
1**
201
Calculated
10
301 to 310
*Each removeable terminal block can accommodate up to two single-ended measurement sensors or
one differential sensor, but not both.
**Calculated from PV Clean & PV Soil inputs
Precautions
Failure to adequately ground the system puts the logger and sensors at
risk for electrostatic damage (ESD). The included grounding cable
should be affixed to Earth ground to provide a discharge path from the
logger to earth.
Care should be taken to avoid ground loops in the system when
planning out your installation.
When operating in higher ambient temperatures, the outer surface of
the logger may become hot to the touch.
Users should test or measure the temperature of the logger before
touching or handling it after extended periods of use in warmer
climates.
Environmental Considerations
•Sensor cables become less flexible and are more easily damaged at very low temperatures.
Make sure that all cables are securely fastened so they do not flap in the wind.
•If the equipment will be exposed to high salinity, use protective grease or other dielectric agent
on terminals and ground connections.

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SECTION 2 | SYSTEM OVERVIEW
This section of the manual is designed to provide you with the basic information needed to prepare and
install your LOGR system. See Error! Reference source not found. for explanations on the User
Interface, and Error! Reference source not found. for physical installation & wiring.
Unpacking LOGR
Confirm that you have received all components by comparing your order to the packing list included
with your shipment. Immediately contact NRG Systems if any of the components are missing.
Components Map

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Serial Number & Logger
Identification label
Each LOGR can be identified by the label on the top of the case, which
contains the “NRG LOGR” model name, serial number (9431XXXXXX)
and MAC Address.
Analog Channel Ports
Seven ports can support up to fourteen (14) single ended sensors, or
up to seven (7) differential sensors.
Serial Channel Ports
Three COM-A and one COM-B serial ports can support up to twelve
(12) sensors with programmable baud rates differing between the A
and B ports. Twenty-four (24) serial channels are available for
measurand configuration.
PV Soiling Measurement
Inputs
These ports are designed to support the NRG Soiling Measurement Kit
which delivers a ratio between clean and soiled PV panels. These ports
also accept power and ground inputs from other PV panels. Wire
gauges accepted are 24 to 12 AWG (0.205 to 3.31 mm²).
LED Status Indicator
Lights
Two LEDs, one green (power) and one red (fault), provide immediate
user feedback at the logger. A steady green light indicated consistent
power and proper function of the LOGR. A blinking red light indicates
errors or an in-progress firmware update.
Power Input
LOGR requires 16 to 28 VDC of power input. The logger typically draws
75 mA at 16 V (1.2 W) when unloaded.
Modbus Client Port
This Modbus RTU port allows the LOGR to connect directly with a
computer, or to another logger.
Ethernet Port
This ethernet port features a green LED to indicate traffic. The flashing
light indicates active data acquisition transfer.
Ground Stud
The #10 grounding stud should be connected to earth ground with
either the provided grounding cable or alternative.
Reset Button
The logger can be reset to factory default by inserting a paper clip to
depress the recessed button. Note that the IP Address will also revert
to default 192.168.179.252.

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Power Source
LOGR requires a DC power supply of 16 to 28 V DC and consumes up to 4 A of current at 16 V when
supplying power to attached smart sensors. Nominal supply voltage is 16 V, and the unit contains no
boost regulators.
If the voltage decreases below 16 V, the unit still functions but Modbus and analog sensor excitation
ports follow the input voltage down. When the input voltage gets dangerously low and data can no
longer be reliably acquired and recorded, the unit will shut down so that all internal settings are
protected.

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SECTION 3 | PRE-INSTALLATION PREPARATION
While LOGR is easy to set up, it is a good idea to get familiar with the system before going to the
installation site. The following sections provide an overview of the software you will use to prepare your
LOGR system for field installation. Relevant operational details are provided to help you optimize the
system and its communications for your site and project.
Connecting through the Ethernet port
Once LOGR is powered, it performs a starting sequence and will emit a beep when ready for
configuration. Connect to LOGR via Ethernet with a standard Cat 5 or Cat 6 cable to a device running a
web browser.
The LOGR default IP Address is 192.168.179.252.
Type 192.168.179.252/index.htm into a web browser address bar.

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Network Settings Configuration
Configuring the IP Address
To secure your LOGR unit, it can be set to use DHCP for use on a network containing a DHCP server or
use a static IP address (default option). To set the IP address, navigate to the Logger Menu at the top of
the window and select Network Settings from the drop-down options.
Using DHCP
−Obtain IP Address Automatically | Enabled
Using Static IP address
−Obtain IP Address Automatically | Disabled
−Enter values for the fields below: *
oIP Address
oNet Mask Address
oGateway Address
oDNS Address
*These fields are only editable when Obtain IP Address Automatically is disabled.

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When completed select the yellow Apply button, then confirm values are correct and select the Confirm
button on the resulting Network Address Confirmation screen.
LOGR takes about 10 seconds to confirm the settings change and will emit a beep when complete.
The home page address becomes X.X.X.X/index.htm, where X.X.X.X is the newly specified IP Address.
If a link cannot be made and a static IP address has not been set, the LOGR defaults to IP Address
192.168.179.252.
If a link is still not made, the LOGR can be reset to the default IP
address by pushing and holding the RESET button on the logger face
until a beep is heard.
The reset button is located between the 16 to 28 V DC input and the
COM A-1 serial channel block.
If set to use DHCP and obtain a web address automatically, and a DHCP server is not found, LOGR
defaults to IP Address 192.168.179.252.
Once configured, LOGR should connected to a SCADA network where real-time data is available via
Modbus TCP and are viewable on the webserver Sensor Outputs home page.
For any single LOGR unit only ONE user may be logged into the
webserver at any given time. If two browsers are open and connected
to the same LOGR IP address, full functionality will not be available and
saving edits and configurations may be hindered.

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Modbus RTU
LOGR has an available Modbus RTU Client Port which enables the logger to be used with a Modbus
server to query the registers in the SCADA map.
To configure this port:
1. Navigate to the Logger menu at the top of the page and select Network Settings from the drop-
down options.
2. Scroll to the Modbus RTU Settings to complete setup.
3. Edit the Client Address, Baud Rate, Data Bits, Parity, Stop Bits as necessary and choose if the
Termination Resistor is Enabled or Disabled.
4. Click the yellow Save button to apply changes to the port settings. Note that when these values are
saved the LOGR will reboot.

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NTP Server
For improved time accuracy, an NTP server can be configured for daily time updates.
To configure:
1. Navigate to the Logger menu at the top of the page and select Time Synchronization from the drop-
down options. The LOGR defaults to Disabled (no NTP checks).
2. Set the NTP mode to Local and enter the IP Address or URL of your local NTP server.
3. Click the yellow Apply button.
Note that LOGR has an embedded coin cell battery installed to maintain operation of the
real-time clock through power disruptions.

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System Configuration
Navigate to the Logger menu at the top of the page and select System Configuration from the drop-
down options.
Site Properties
Site
This field contains the name for the site. A site description of up to 32
characters can be entered. This is used to provide a brief description of
the site or the site number, such as “Site 1234.” Frequently the last
four digits of the logger serial number are used as a site number.
Project
This field contains the project name for the site. A project description
of up to 20 characters can be entered. Project is usually a broader term
that can describe a group of multiple sites. This is used to provide a
brief description of the overall project, such as “Windy Solar Farms.”
Location
This field contains the location name for the site. A location description
of up to 32 characters can be entered. This is used to provide a brief
description of the site, such as “Block B Tower” and may include the
site number if there are multiple in the same area
Latitude
Enter latitude in decimal degrees (rather than in degrees, minutes,
seconds). Format should be formatted like “44.3286110.”Use positive
(+) numbers for northern latitudes; use negative (-) numbers for
southern latitudes.
Longitude
Enter longitude in decimal degrees (rather than in degrees, minutes,
seconds). Format be formatted like “-73.1100000.”Use positive (+)
numbers for eastern longitudes; use negative (-) numbers for western
longitudes.
Elevation (m)
Enter the elevation of the installation location in meters.

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Date and Time
Device Time (Local Logger)
The LOGR clock’s current time is displayed. Verify that this is the
current time in the local time zone in standard time (not “daylight-
saving” time).
Reference Time (UTC)
Reference Time is the PC clock’s current time, displayed in UTC.
Pressing the Set Time button will update the logger’s clock to the
reference time.
Time Zone
Select the LOGR’s local time zone from the drop-down list.
Note: Use logger local standard time (not daylight-saving time). The
logger clock will not adjust for daylight saving time.
System Info
This section provides information on the installed and configured PC boards of this LOGR.

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Channel Configuration & Data Collection
Analog Sensors
LOGR provides seven ports for a total of fourteen analog channel options. These are used for
measuring parameters including solar radiation, PV temperature, ambient temperature, barometric
pressure, relative humidity, and more. The LOGR analog sensor ports have 12 V excitation with a limit of
50 mA per port.
Eachportcanbeconfiguredtosupporttwosingle-endedsensors,eachonaseparatechannel,orone
differentialsensor.Thistotalssevendifferentialorfourteensingle-endedsensors(oracombination
thereof).LOGRhasavarietyofdefaultsensorsavailable,butgenericsensorsarealsosupportedby
selectingthecorrectvoltagelevelforthespecifiedsensor.Notethatthescaleof(-75to+75)mVisfor
usewithdifferentialsensorsonly.Allothermeasurementlevelscanbeusedforeithersingleendedor
differential sensors. For complete analog sensor wiring instructions, see the Required
Tools
Sensor Connections section on page 37.
Voltage Level
Measurement Accuracy at 25˚C
(-75 to +75) mV
10uV
(-1.1 to +1.1) V
400uV
(-10 to +10) V
900uV
Both 1-second and statistical (average, max, min, and standard deviation) data are available via Modbus
registers. The web server home page provides a quick view of live data to ensure sensors are connected
and performing properly during setup.