DBT12/15/24 Operations Manual....45
7.4.2. Parallel Mode
The Trident System operates in this mode if all of the following conditions are met:
Both shore cords have power.
Shore cords 1 and 2 are powered from the same phase.
All units are turned ON and there are no faults.
In Parallel mode the Paralleling Master does the following:
Displays the operating mode: PARALLEL.
Connects the two ship buses together.
If the shore cord 2 voltage has a 180° phase difference from that of shore cord 1, it reverses
internally the polarity of shore cord 2, so that the Slave DBT shore power inputs are in phase.
Enables current balancing between shore cords 1 and 2.
Takes control of all relays and contactors of the Slave DBT units, also deciding the gain.
In Parallel mode the Slave DBT units display the status word SLAVE.
If one Slave DBT is turned OFF, loses power or detects a fault, and the Paralleling Master still has
power, the Trident System will go to Slave 1 or Slave 2 mode. The Paralleling Master will safely
release control of the Slave DBT relays and contactors. The Slave DBT units implement a 5
second delay to go from Slave to autonomous (Single) operation.
7.4.3. Two Singles Mode
The Trident System operates in this mode if all of the following conditions are met:
Both shore cords have power.
Shore cords 1 and 2 are powered from different phases of a 3-phase system.
All units are turned ON and there are no faults.
NOTE: The shore power phase difference is displayed on the Paralleling Master on the top right
in the first summary screen. Any value between 6° and 174° or between 186° and 354° is
interpreted as the shore cords being powered from different phases.
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