Etrel load guard Manuel utilisateur
ETREL LOAD GUARD
USER MANUAL
Document version: 2.1
Document date: 30. 7. 2020
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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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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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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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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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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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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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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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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.
L1
L2
L3
P
E
N
L
1
L
2
L
3
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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
n
To
Load Guard
Cabinet
terminals
Table des matières
