GE Multilin DBT, Instruction Manual

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OPERATING PRINCIPLES
10 DBT Digital Trip Coil Supervision Relay GEK-105597C
Internal setting
In the 3 coils DBT model, there is an internal setting which can be made by moving a jumper in the printed circuit,
that allows to configure all the outputs as general ones (BREAKER CIRCUIT OK). Any failure (undervoltage or
resistance) will mean that all outputs will be deactivated.
In addition to the outputs mentioned, and as described in detail in
Figures 2 & 3: External Connections , the DBT has
a SYSTEM READY output relay. This closes the contact in case the relay is not available due to one of the following
causes:
•
An internal fault.
•
An auxiliary voltage drop of the supply.
•
The relay has been disabled.
The DBT can be disabled either externally by enabling one or several of any of the 4 digital inputs for inhibition (in the
case of the 3-phase) or by the single input for the single-phase, or locally by the switch labelled ENABLE. A disabled
DBT will continue to measure and give information through the LEDs but all its relays will be inoperative except the
SYSTEM READY relay, which will close its contact.