GE Multilin DBT, Instruction Manual

Page: 23 / 30

RECEPTION TESTS
22 DBT Digital Trip Coil Supervision Relay GEK-105597C
7.5 RESISTANCE MEASUREMENT TEST
To carry out this test, which is done on the measuring unit of coil 1, disconnect terminal B4 and leave it unconnected
(simulating an open circuit). Place a resistor (simulating the breaker coil) between terminals B2 and B3. This
resistance should give the readings indicated in the table below.
Resistance
setting (
Ω
)
Minimum R
(
Ω
)
Maximum R
(
Ω
)
75 67 82 Check that the relays do not
90 82 99
trigger at the minimum values
105 95 115
and that they do at maximum
135 122 149 values.
195 175 215
300 270 330 The test is done in the sequence
described for each of the
settings indicated
Repeat this test for the units
Corresponding to coils 2 and 3.
7.6 ENABLE TEST
Disable the relay by putting the ENABLE switch in the left-hand position. Check that there is no disabling through the
digital inputs (disconnect or deenergize these inputs).
The alarm contact will close and the enabled relays will drop-out. The ‘READY’ LED will go from green to red.
Enable the relay by putting the ENABLE switch in the right-hand position.
Repeat this test by applying nominal voltage to each of the 4 digital inputs (3-phase model) and the single input for
the single-phase model. The same will happen as in disabling by the ENABLE switch.