System Overview; Power Allocation Strategies; Sequential Power Allocation - ABB Terra 94 UL Operation And Installation Manual

"Operation and installation manual" - "Terra 94/124/184(NEVI) UL"
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3.4

System Overview

A
Ref. Part
A EV
B
Parking space
C Front of the EVSE
D EVSE
E
AC input cable
F Power distribution board
1
G EV charge cable
3.5

Power allocation strategies

0 - 99%
The EVSE can be configured to operate with different power allocation strategies. The configuration can be
changed at any time through the EVSE configuration tools.
50%
The configuration of the EVSE allows for these power allocation strategies:
Power allocation strategy
Sequential
Concurrent
Dynamic 'Fair share'
3.5.1

Sequential power allocation

1
0 - 99%
100%
NOTE
EV charging with the use of the CCS standard can 'fall asleep' if the EVSE does not start the
session within a few minutes. This is a common issue. It is recommended to connect a second
EV only shortly before the first charge session ends.
B C D
G
2
0 - 99%
50%
2
0 - 99%
E F
Function
Electrical Vehicle to be recharged
To park the EV during charge session
Side of EVSE with EV connectors and HMI (User Interface)
EV charger
To supply the input AC voltage to the EVSE
AC grid input protection and distribution circuits
To connect the EV to the EVSE
Available for EVSE models
All models
Models with more than one DC outlet (except for Terra 94)
Models with more than one DC outlet (except for Terra 94)
When the EVSE is configured for sequential power allocation, it
can serve one EV at a time with DC fast charging.
In this configuration the EV charging power is the maximum
power available to the EVSE, the rated power output. Effectively
the maximum power output can be less than the rated power
output because of power constraints. For example, the power
output can be permanently limited due to site current or power
constraints, or temporarily limited by power management sys-
tems.
Only one DC charge session can be performed at a time. When a
second EV is connected to the EVSE, the EVSE must first finalize
the first charge session before a new charge session can start.