Etrel Load guard Bedienungsanleitung

ETREL LOAD GUARD

USER MANUAL

Document version: 2.1

Document date: 30. 7. 2020

 
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Etrel Load Guard | User manual 
 
 
 
 
 
 
 
 
 
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TABLE OF CONTENTS 
1PREFACE .....................................................................................2 
Benefits of Using Load Guard ............................................................2 
Where to Use Load Guard .................................................................3 
Prerequisites for Use .........................................................................3 
2LOAD GUARD..............................................................................4 
Technical Specifications.....................................................................5 
3CONNECTING THE LOAD GUARD..................................................6 
Load Guard Current transformers .....................................................7 
Connecting the Current transformers ...............................................7 
Three-Phase Connection....................................................................7 
Single-Phase Connection ...................................................................9 
Production of Energy at the Location..............................................10 
4OBTAINING IP ADRESS OF COMPUTER AND CHARGING STATION11 
Computer IP Address .......................................................................11 
Charging Station IP Address.............................................................12 
5CONFIGURATION ......................................................................14 
Software for Configuration..............................................................14 
Configuration of the Load Guard .....................................................16 
Load Guard Network Settings......................................................16 
Charging Station Serial Number...................................................18 
Pairing ..............................................................................................18 
Pairing of Load Guard to Charging Station ..................................18 
Pairing of Charging Station with Load Guard...............................19 
6TROUBLESHOOTING..................................................................22 
Configuration Software Can Not Find the Load Guard....................22 
No Connection Between Load Guard and Charging Station............22 
Serial Number is Not Valid...............................................................23 
Load Guard Does Not Measure Voltage ..........................................23 
Negative Value of Active Power ......................................................24 
Displayed Power is Not Correct .......................................................24 

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Etrel Load Guard | User manual

1 PREFACE

Load guard is a sensor that is installed in the building’s electric cabinet. It

measures the electric current in the building’s installation and sends real-

time measurements to the charging station.

INCH charging station responds to received data by reducing the charging

power in order to keep the total load of installation below the installation

rated value or increasing it to utilise the remaining available power for

faster charging.

As Load Guard measures electric current in both directions, it is capable

of sensing the power surplus generated by local renewable energy

sources, such as photovoltaics. Green energy is used for faster and

cheaper charging, thanks to algorithms in INCH charging stations.

Figure 1: Etrel Load Guard

BENEFITS OF USING LOAD GUARD

•Optimised energy consumption of existing infrastructure.

•Reduced charging and operational costs.

•Local consumption of renewable energy sources.

•Future-proof and grid-friendly charging infrastructure.

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Etrel Load Guard | User manual

Figure 2: Load Guard preventing the fuses overload

WHERE TO USE LOAD GUARD

Load Guard sensor is especially important in situations, where charging

stations do not have a dedicated power supply but rather share available

power with other consumers in the building.

Homes

Apartment buildings

Business fleets

Parking spaces

Commercial buildings

PREREQUISITES FOR USE

•Load Guard connected to the mains and LAN.

•A computer connected to the same LAN as the Load Guard.

•Load guard configuration program (Load Guard Configurator).

•INCH charging station (set up as a master) connected to the same

LAN as Load Guard.

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Etrel Load Guard | User manual

2 LOAD GUARD

Load Guard is a device that measures the current and voltage across

phases of a particular segment of the power grid, calculates power and

sends all data to the master station.

Power management of master charging station decides, based on

information provided by Load Guard, what target current to set on its

connector and other stations of the cluster. If necessary, it will increase

or decrease the charging power or even stop it completely to prevent the

fuses from switching off due to overcharging.

Load Guard allows charging with maximum current without overloading

the fuses.

Figure 3: LED lights of Load Guard

The Load Guard has three LEDs on the front plate labelled PWR, DATA and

PLC. When the Load Guard is connected to the power supply, the PWR

light should light up. If the connection between the Load Guard and the

charging station is established, the DATA light flashes. If a PLC connection

is established, the PLC light should light up.

Figure 4: Measuring current transformers set on all three phases

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Etrel Load Guard | User manual

To measure electric current, it uses 150 A current clamps (for conductors

up to 16 mm in diameter) and 400 A current clamps (for conductors up to

24 mm in diameter). The length of the wires for connecting the current

clamps to the Load Guard is 70 cm.

Figure 5: Load Guard with connected measuring current transformers

TECHNICAL SPECIFICATIONS

DIMENSIONS

90.5 x 53.5 x 61.8 [mm]

Width 3 TE on DIN rail

WEIGHT

0.23 - 0.70 [kg], packaging adds 0.10 [kg]

CLAMP CABLE LENGTH

70 cm

CLAMP DIAMETER

Small 16 mm, large 24 mm

CONNECTION

Single-phase or three-phase

MAX. RATED CURRENT

150 A or 400 A per phase

OPERATING VOLTAGE

Up to 253 V AC phase voltage

This limitation is set by the highest operational voltage

of the charging station.

FREQUENCY

50 Hz or 60 Hz

TEMPERATURE RANGE

Operation temperature range: -25°C to +60°C

Storage temperature range: -30°C to +90°C

COMMUNICATION

Ethernet

CONFIGURATION AND

MONITORING

Web interface

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Etrel Load Guard | User manual

3 CONNECTING THE LOAD GUARD

Load Guard is installed in electrical cabinet, after the main counter. It

measures currents of all phases and is sending the measurements to the

charging station in real time to ensure that the overload of the fuses

cannot happen.

It can measure in both directions, so it can also measure the energy that

is flowing back to the electrical grid. In case of production of energy at the

location it can turn up the charging power suppling the electric vehicle.

When bought at the same time, the Load Guard and charging station

would already be preconfigured and both devices would be already

paired.

Load Guard can be connected single-phase or three-phase. Current

clamps should be put on certain phase conductors and the Load Guard

should be properly connected to the power supply first and only then to

the LAN.

Figure 6: Load Guard installed in electrical cabinet

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Etrel Load Guard | User manual

LOAD GUARD CURRENT TRANSFORMERS

Figure 7: Dimensions of current transformers

CONNECTING THE CURRENT TRANSFORMERS

Figure 8: Connecting the current transformers

THREE-PHASE CONNECTION

For proper three-phase connection, current clamps must be placed on

specific phase conductors.

Figure 9: Correct connection must consider the correct sequence of phases

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Etrel Load Guard | User manual

The following figure shows the current clamp cables connection for all

three phases (L1, L2 in L3) from left to right. The phase conductors for

powering the Load Guard must be connected in the same way (from right

to left). Positions for PE (earthing conductor) and N(neutral conductor)

are also indicated. If phases are not connected in correct sequence, the

Load Guard power calculation will be wrong.

Figure 10: Arrangement of input and output phases

Measuring current transformers are connected to the Load Guard as it is

shown on the following figure.

Figure 11: Load Guard and connected measuring current transformers

The procedure of setting up measuring current transformer on the

conductor is to open it and close it with conductor wire inside of it. The

conductor does not need to be interrupted for the connection.

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Etrel Load Guard | User manual

The direction of energy flow must be considered. On the inside of the

measuring current transformer there is an arrow, which must point in the

direction of energy flow (from clamps to the consumers). If the direction

of measuring current transformer is wrong, Load Guard will be measuring

negative power. If this happens, turn the measuring current transformer

correctly.

Figure 12: Arrow pointing in the direction of energy flow

SINGLE-PHASE CONNECTION

In case of single-phase connection, the measuring current transformer is

set only on the phase conductor that is used, as shown on the following

figure.

Figure 13: Single phase connection of measuring current transformer

Only one measuring current transformer is needed in single-phase

connection. Load Guard must be connected as shown in the following

figure.

If phase and neutral conductors are switched (L1 in N), the voltage in Load

Guard Configuration Software will be very low, or even 0 V (instead of

~230 V).

Consumptio

Load Guard

Cabinet

terminals

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