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6.2 'ENABLE' SWITCH
This switch has two positions:
- Left: relay disabled, READY LED will go red.
- Right: enabled relay, the READY LED goes green, provided none of the external disabling inputs are
active.
At the back of the relay there are digital disabling inputs on terminals C1-D1, C2-D2, C3-D3 and C4-D4 (3-
phase model) and C1-D1 for the single-phase model (see Figure 6: Rear terminal plate). The enabling of any of
these inputs has the same effect as the ENABLE switch in the left position.
The enabling of the inputs is DC operated (same margin as supply voltage). As there is galvanic insulation
between them they can be enabled by voltage from different batteries or can be grouped in a single one. These
inputs are polarised, the positive on the C terminals and the negative on the D terminals. An inversion of polarity has
no negative effects on the relay, although the input would not be enabled.
6.3 'RESET TARGET' SWITCH
This switch has two uses:
- Acknowledgement of indicators. A fault is recorded by an LED with memory. This is erased by pressing
and releasing the RESET button. If the auxiliary voltage drops the registered LED operation will be erased
too.
- Checking indicators: This feautre is used to ensure indicators are working properly. When the RESET
button is pressed all the indicators which are out will lit up.
6.4 LED INDICATORS
There are four LEDs, the first indicates a breaker power supply fault and the others coil faults. They are red
LEDs, and can be in one of the three following states:
- Off.
- Flashing red: fault situation. If this situation continues for the preset time period, the output relay will be
- Red:
If a red light is present and another fault occurs the LED does not flash, but when RESET is pressed the LED starts
to flash.
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This means there is no fault. In the case of the breaker power supply it would be above the
preset voltage. For coils, that their resistances are not above the preset value.
enabled and the LED will continue to flash.
a fault has occurred but disappeared, although not yet acknowledged by the user. This
acknowledgement is done by pressing RESET.
DBT Digital Trip Coil Supervision Relay
RELAY SETTINGS
GEK-105597C
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