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The external control system (leader) manages the
system and communicates with all connected
Wallboxes (followers). The external control system
controls the energy distribution. This approach
enables solar energy to be fed in when an electric
vehicle is being charged, for example.
Please observe the points below for trouble-free
installation and commissioning.
3.1
Prerequisites
•
At least two Wallboxes with local load
management
•
At least one Wallbox and an external control
system with external load management
•
Maximum of 16 Wallboxes
•
One hybrid/electric vehicle per Wallbox
•
Energy supply at least 6 A per Wallbox (in case
of overloading, ongoing charging processes will
be completed first)
i
To avoid single-phase load peaks, connect the
devices with an alternating phase sequence.
•
First Wallbox: L1, L2, L3.
•
Second Wallbox: L2, L3, L1.
•
Third Wallbox: L3, L1, L2.
•
Fourth Wallbox: L1, L2, L3 again, etc.
3.2
Bus topology
Prerequisites:
•
Bus system: RS485 fieldbus
•
Protocol: M odbus RTU
•
The leader distributes the total current in the
system.
•
A charging current (default: 6 A) is configured for
each Wallbox. Set the required charging current.
•
The follower Wallboxes revert to standby state
when not in use.
•
Communication between the follower Wallbox
and leader Wallbox is required in order to start
the charging process.
Local load management:
•
One Wallbox as the leader and at least one
or up to 15 Wallboxes as followers
•
The physical position of the Wallbox (leader)
is freely selectable
External load management:
•
External control system (e.g. HEMS) which
is configured as the leader and at least one
or up to 16 Wallboxes as followers
3.3
Check-list for local load
management
•
Wire the power supply and the bus system so
as to avoid single-phase load peaks.
•
Select the leader Wallbox.
•
Set the number of follower Wallboxes in the
leader Wallbox.
•
Set the maximum system current in the leader
Wallbox.
•
Set the maximum and minimum individual
charging currents in each Wallbox.
•
Set the bus ID in each follower Wallbox.
•
Activate the bus terminating resistor in the first
and last Wallboxes.
•
Configure the optional blocking function in the
leader Wallbox.
3.4
Check-list for external load
management
•
Wire the power supply and the bus system so
as to avoid single-phase load peaks.
•
Configure the external control system (following
the manufacturer's instructions).
•
Set each Wallbox as a follower Wallbox.
•
Set the bus ID in each Wallbox.
•
Set the maximum and minimum individual
charging currents in each Wallbox.
•
Activate the bus terminating resistor in the
external control system and the last Wallbox.
4.
Configuration of the Wallboxes
The individual Wallboxes must be pre-configured
using rotary switches and micro switches to operate
the integrated network of Wallboxes (Fig. XIV).
All rotary switches and micro switches are initially
set to OFF. The configuration differs in some cases,
depending on the local or external load manage-
ment mode.
Mode-independent switch functions:
S1: rotary switch S1 is used to set the maximum
charging current of 6 A to 16 A per Wallbox
S3: configuration of minimum charging current
S6: bus terminating resistor On/Off
Switch functions in local load management mode:
S2: setting of maximum system current (only in
leader Wallbox)
S4: in leader Wallbox: setting of the number of
followers
S4: in follower Wallbox: setting of the respective
bus ID
S5: setting of leader or follower, front illumination
and blocking
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