Technical Functioning; Normal Operation; Power Distribution - ABB Terra 54 User And Operation Manual

4.4

Technical functioning

4.4.1

Normal operation

When the charger is in operation (when idle; not charging), the default positions of the
different switches and breakers are as follows:
Front panel
• RCBO control group (A): up.
• DC charge power RCD group (B): up.
• Main switch (C): vertical ('1')
Right side panel (controls and DC charging):
• Circuit breakers power modules (D, 5x): vertical ('1')
• Overvoltage protection (G): up
Left side panel (AC charging):
• MCB (J): up
• RCD (K): up
4.4.2

Power distribution

The main power can be switched off using the main switch (C). This switch is accessible
when opening the front door. When the main switch is off, the grid voltage is removed
from all components in the charger. Only the grid cable below the main switch is still
connected/live (H).
From the main switch, the power is divided into groups. The charger has two (in case of
only DC charging) or three (in case of DC and AC charging) power groups:
• Control power group; feeds power to all electronic components in the cabinet.
• DC charge power group; feeds power the power modules needed for DC
charging.
• AC charge power group; feeds the AC charging.
The control group is protected by an RCBO (A).
The DC charge power group is protected for earth faults by a high immunity RCD (B).
An AC relay (F) switches the power to the individual circuit breaker (D, 5x) of each power
module. This relay is controlled via a safety circuit by the:
• Emergency stop button
• RCD
• Door switch
• Software
The AC charge power group is protected for earth faults by a type B RCD (K). The
maximum current, which can be used by the car is protected by an MCB (J).
An AC relay (I) switches the power to the car. This relay is controlled via a safety circuit by
the:
• Emergency stop button
• RCD
Door switch
•
• Software
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