GARO GNM3T V2 Three Phase Energy Analyzer User Manual

: June 26, 2024
: GARO

Table of Contents

GNM3T V2/GNM3D V2
Use
Working with GNM3T V2/GNM3D V2
Commissioning
Menu description
Input, output and communication
Essential information
DMD values
LCD display
Restoring the factory settings
- Restoring the settings using the RESET menu
- Restoring the MID menu using the RESET menu
WIRING CHECK function
- Introduction
- Display check
Tariff management
- Tariff management via digital input
- Tariff management Modbus RTU
Run-hour meters
Maintenance and disposal
Cleaning
Responsibility for disposal
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GARO GNM3T V2 Three Phase Energy Analyzer User Manual

This manual

Information property

Copyright © 2024, GARO AB
All rights reserved in all countries.
GARO AB reserves the right to apply modifications or make improvements to the relative documentation without the obligation of advance notice.

Safety messages

The following section describes the warnings related to user and device safety included in this document:

NOTICE : indicates obligations that if not observed may lead to damage to the device.

CAUTION! Indicates a risky situation which, if not avoided, may cause data loss.

IMPORTANT: provides essential information on completing the task that should not be neglected.

General warnings

This manual is an integral part of the product and accompanies it for its entire working life. It should be consulted for all situations tied to configuration, use and maintenance. For this reason, it should always be accessible to operators.

NOTICE : no one is authorized to open the analyzer. This operation is reserved exclusively for GARO AB technical service personnel.
Protection may be impaired if the instrument is used in a manner not specified by the manufacturer

Service and warranty

In the event of malfunction, fault, requests for information or to purchase accessory modules, contact the GARO AB branch or distributor in your country.

Installation and use of analyzers other than those indicated in the provided instructions and removal of the MABC module void the warranty.

GNM3T V2/GNM3D V2

Introduction

GNM3T V2 is an energy analyzer connected through 5 A current transformers, for two- and three-phase systems up to 415 V L- GNM3D V2 is an energy analyzer for direct connection up to 65 A, for two- and three-phase systems up to 415 V L-L.

In addition to a digital input, the unit can be equipped, according to the model, with a static output (pulse or alarm), a Modbus RTU communication port or an M-Bus communication port.

Description

Figure 1 – GNM3T V2 Front

Figure 2 GNM3D V2- Front

Figure 3 GNM3D V2 – Back

Energy metering

PFA models
Easy connection function: irrespective of the current direction, the power always has a plus sign and contributes to increase the positive energy meter. The negative energy meter is not available.

PFB models
For each measuring time interval, the individual phase energies with a plus sign are summed to increase the positive energy meter (kWh+), while the others increase the negative one (kWh-).

Example:
P L1= +2 kW, P L2= +2 kW, P L3= -3 kW
Integration time = 1 hour
kWh+ = (2+2) x1h = 4 kWh
kWh- = 3 x 1h= 3kWh

PFC models
For every measuring interval time, the energies of the single phases are summed; according to the sign of the result, the positive (kWh+) or negative totalizer (kWh-) is increased.

Example:
P L1= +2 kW, P L2= +2 kW, P L3= -3 kW
Integration time = 1 hour
kWh+=(+2+2-3)x1h=(+1)x1h=1 kWh
kWh+=0 kWh

Use

Interface

Introduction

GNM3T V2/GNM3D V2 is organized into two menus:

Measurement pages: pages allowing to display the energy meters and the other electrical variables
Main menu, divided into three sub-menus:
o » SETTINGS: pages allowing to set the parameters
o » INFO: pages displaying general information and the set parameters
o » RESET: pages allowing to reset the partial counters and the dmd calculation, or to restore the factory settings

Measurement page display

Information and warnings

Working with GNM3T V2/GNM3D V2

Working with the measurement pages

Commissioning

Preliminary settings

At switch-on, the device displays two preliminary setting menus:

MID SETTINGS, for GNM3T V2, MID models only
QUICK SETUP

This procedure, only available in MID models, allows to program the current transformer ratio (CT ratio).

This procedure is available when the instrument is switched on for the first time.
Note : the available parameters depend on the model.
In the “QUICK SETUP?” starting page

**S1 models

**

**M1 models

**

**O1 models

**

Measurement pages

The displayed pages depend on the selected system.

This menu allows to display the set parameters.

This menu allows to reset the following settings:

Input, output and communication

Digital input

The digital input can perform four functions:

Digital output (version O1)

The digital output can perform two functions:

Modbus RTU port (version S1)

Modbus RTU communication port is used to transmit data to a Modbus master (any SCADA, PLC, BMS, etc).
For further information about Modbus RTU communication refer to the communication protocol.

M-Bus port (version M1)

M-Bus communication port is used to transmit data to a M-Bus master (any third party M-Bus master).
For further information about M-Bus communication refer to the communication protocol.

Essential information

Alarms

Introduction

EM500 manages a measured variable alarm. To set the alarm, define:

the variable to be monitored (VARIABLE)
alarm activation threshold value (SET POINT 1)
alarm deactivation threshold value (SET POINT 2)
alarm activation delay (ACTIVATION DELAY)

Variables

The unit can monitor one of the following variables:

system active power
system apparent power
system reactive power
system power factor
phase-neutral voltage (OR logic)
phase-phase voltage (OR logic)
current (OR logic )

Note : if you select a current or a voltage, the analyzer simultaneously monitors all the phases available in the set measurement system and triggers the alarm when at least one of the phases is in alarm (OR logic)

Alarm types

Up alarm (Set point 1 ≥ Set point 2)
The alarm activates when the monitored variable exceeds the Set 1 value for a time equal to the activation delay (Delay) and deactivates when the values drops below Set 2.

Down alarm (Set point 1 < Set point 2)
The alarm activates when the monitored variable drops below the Set 1 value for a time equal to the activation delay (Delay) and deactivates when it exceeds Set 2.

DMD values

Average value calculation (dmd)

GNM3T V2/GNM3D V2 calculates the average values of the electrical variables within a set integration interval (15 min by default).

Integration interval

The integration interval starts at switch-on or when the reset command is issued. The first value is displayed at the end of the first integration interval.

Example

The following is a sample integration:

reset at 10:13:07
set integration time: 15 min.

The first value displayed at 10:28:07 refers to the interval from 10:13:07 to 10:28:07.

LCD display

Home page

The unit may display the default measurement pages after no operation has been performed for five minutes, if the screensaver is enabled and the screensaver type is as “Home page” (default value).

Notes : if you select a page that is not available in the set system, the unit displays as its home page the first available page. In MID models the home page cannot be changed and displays the active energy meter.

Backlight

GNM3T V2/GNM3D V2 is equipped with a backlight system. You can set whether the backlight shall always be ON or whether it should automatically switch off after a given interval has elapsed since a button was pressed (1 to 60 minutes).

Screensaver

If the SCREENSAVER function is enabled (default setting), after 5 minutes have elapsed since a button was pressed the unit will display the home page if the screensaver type is “Home page” (default setting), or it shall activate the slideshow function, which displays the selected pages on a rotating basis.

Notes : In MID models the screensaver setting is “Homepage” and cannot be changed.

Page filter

The page filter makes it easier to use and browse the measurement pages. When you use the buttons, the unit shall only display the pages you are most interested in, which can be selected through the software (S1 version) or is pre-defined (O1 and M1 version)

Note : to display all the pages without using the software, you can disable the page filter from the SETTINGS MENU DISPLAY → PAGES→ ALL). By default, the pages included in the filter are: 1 (kWh+ TOT, kW), 2 (kWh- TOT, kW), 5 (VLN, VLL, Hz), 7 (kvarh+ TOT, kvar), 8 (kvarh- TOT, kvar), 25 (L1 A, L2 A, L3 A), see “Measurement pages” on page 14.

Restoring the factory settings

From the RESET menu you can restore all the factory settings. At start-up the QUICK SET-UP menu shall be available again.

Notes : meters are not reset. In MID models you cannot reset the CT current transformer ratio (CT RATIO).

Note : in MID models the reset can only be performed if the energy meter has not exceeded 1 kWh. In case of wrong settings, you can then correct any CT current transformer setting errors (CT ratio), reactivating the MID programming menu.
Notes : if active energy has exceeded 1 kWh, the CT ratio cannot be changed.

WIRING CHECK function

Introduction

The WIRING CHECK function allows to check and correct the connections.
For it to work properly, the following three conditions must be met:

the set system must be “3P+N”,
all voltages must be connected,
All currents must be greater than zero, with an offset ranging between a 45° lag and a 15° lead (power factor > 0.7 inductive or > 0.96 capacitive)

Display check

During operation, if a wiring error is detected the alarm icon will light up.
If the three conditions fail to be met, the following indications shall be displayed in the WIRING info page:

V MISSING: at least one voltage is missing
I MISSING: at least one current is missing
PF OUT OF RANGE: the current-voltage offset is out of range.

Tariff management

Tariff management via digital input

To manage tariffs using the digital input set the function of the digital input as tariff (via keypad or software). The current tariff depends on the status of the input

Tariff management Modbus RTU

To manage tariffs using the Modbus RTU command enable tariff management via Modbus command from software

Run-hour meters

GNM3T V2/GNM3D V2 provides 3 run-hour meters:

Maintenance and disposal

Troubleshooting

Note : in case of other malfunctions or of any failure, please contact the GARO AB branch or the distributor for your country

Alarms

Communication problems

Display problem

Cleaning

To keep the display clean, use a slightly wet cloth. Never use abrasives or solvents.

Responsibility for disposal

Dispose of the unit by separately collecting its materials and bringing them to the facilities specified by government authorities or by local public bodies. Proper disposal and recycling will help preventing potentially harmful consequences for the environment and for people.

GARO AB
Södergatan 26 335 33 Gnosjö Sweden
info@garo.se
info: +46(0)370 33 28 00
fax: +46(0)370 33 28 50

www.garo.se

https://www.garo.se/en/professional/
GNM3T V2/GNM3D V2 – User manual