2.4. Ground Relay
In most energy systems for residential or mobile use a TT configuration is used, which means the Neutral of the AC system is
grounded. This is to ensure the GFCI breaker will trip in case there is an earth failure (The connection N/PE will ensure a current
will flow in the secondary circuitry which is detected by the GFCI).
As an autotransformer is also able in some systems to “create” a neutral different from the incoming neutral, a ground relay is
included in the unit. This relay can be controlled by a Multi/Quattro (by disabling the internal ground relay in the inverter/charger
through VE Config or Victron Connect and interconnecting the “ground relay” terminal block in Multi/Quattro and Earth terminal
block in Autotransformer by Positive and Negative conductors. In some of the diagram examples in Section 2.4.1 through 2.4.3 it
is mentioned when it is possible to use the ground relay.
When the Internal ground relay is not selected in VE Config or Victron Connect, there is 12V on the external
terminal of the Multi/Quattro for the ground relay control (on all models 12/24/48V this voltage is 12V).
2.5. Temperature Protected
In case of overheating, the autotransformer is disconnected from the supply. When the transformer is warm the fan will operate
and the Red LED be illuminated. Disconnect some of the 120V load if this occurs.
When the transformer is overheated the MCB will switch off. The little blue switch will be out of the MCB.
To reset this manually cycle the circuit breaker.
Victron Energy Autotransformer
Page 7
Introduction
