DBT12/15/24 Operations Manual....49
8.3. ABNORMAL OPERATION
Abnormal operating conditions are classified into warnings and faults.
8.3.1. Warnings
Warnings are abnormal operating conditions that do not prevent the DBT12/15/24 from delivering
power. Although the DBT12/15/24 continues operating, it may do so at a reduced performance
level or with reduced functionality. The status word WARNING is displayed for as long as a
warning condition is present.
8.3.2. Faults and Restart
Faults are abnormal operating conditions that require the DBT12/15/24 to immediately stop
delivering power. As soon as a fault is detected the shore power and ship power contactors are
opened. The status word FAILURE is displayed for as long as the fault condition is present.
After the fault condition clears the DBT12/15/24 waits for 15 seconds and attempts to restart
operation. During this time the status word WAIT and the 15 second timer are displayed.
DBTxxxx SHORE SHIP-L1 SHIP-L2 xx.xHz
VOLTAGE: xxxV 0V 0V WAIT xx
CURRENT: 0A 0A 0A BOOST1
LOAD: 0.0kVA 0.0kVA 0.0kVA 1/3
NOTE: Since many fault conditions clear immediately upon opening the contactors, the status
word FAILURE may only be displayed for a split second before it is replaced by WAIT and the15
second timer.
To prevent wear on the contactors and relays the DBT12/15/24 limits the number of restarts to 3
per hour. After the third fault clears restart is delayed until 1 hour has passed since the first fault
occurred. Only a single summary screen is displayed during this time with shore power
information, the last 3 faults logged, the status words RESTART, WAIT, and the 1 hour timer.
DBTxxxx SHORE FAULTS LOGGED xx.xHz
VOLTAGE: xxx V xxxxxxxx, RESTART
CURRENT: 0 A xxxxxxxx, WAIT
LOAD: 0.0kVA xxxxxxxx, xx:xx
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