GE DBT, Instruction Manual

Page: 21 / 30

RECEPTION TESTS
20 DBT Digital Trip Coil Supervision Relay GEK-105597C
7.3 TRIP LEVEL TEST
Connect the relay as indicated in the external connections diagram (
Figs. 2 & 3 ), using a DC power supply (110/125
or 220/250 V) for the auxiliary voltage (terminals B9-B10), according to the model. Variations of
±
20% are admitted (-
20% of the minimum and +20% of the maximum). For breaker power supply (terminals B1-B2) a second variable
DC power supply is needed.
Apply different voltages and check that the undervoltage LED flashes (pick-up) with the pick-up voltage (see table
below). The LED remains flashing, until the undervoltage condition disappears (drop-out voltage). When the drop-out
voltage is reached, and the set time ellapses, the LED stop flashing and is lit permanently (fault memory function). It
is recommended to set the time to the minimum in order to ease the test.
110/125 model 220/250 model
VOLTAGE
setting (V) Pick-up
voltage (V)
(voltage
failure) Drop-out
voltage (V)
(voltage ok) VOLTAGE
setting (V)
Pick-up
voltage (V)
(voltage
failure) Drop-out
voltage (V)
(voltage ok)
50 45 55 100 90 110
55 50 60 110 100 120
60 55 65 120 110 130
70 65 75 140 130 150
90 85 95 180 170 190
125 118 133 250 236 264