RFL 9300 RFL Electronics Inc.
October 20, 2004 7 - 7 (973) 334-3100
7.4.2 DIRECT TRANSFER TRIP
1. At one RFL 9300, connect a dc circuit with 0.2-ampere loading in series with the DTT-1 trip circuit (rear-
panel terminals TB2-1 and TB2-2).
This will be the receiving RFL 9300 during this procedure.
2. At the other RFL 9300, connect a dc voltage across the DTT-IN terminals (rear-panel terminals TB9-3
and TB9-4) as follows:
If the Alarm I/O is strapped for 48Vdc, connect a 38Vdc to 58Vdc voltage source.
If the Alarm I/O is strapped for 125Vdc, connect an 88Vdc to 150Vdc voltage source.
If the Alarm I/O is strapped for 250Vdc, connect a 200Vdc to 288Vdc voltage source.
(Refer to paragraph 21.2 for Alarm I/O strapping instructions)
This will be the transmitting RFL 9300 during this procedure.
When the voltage is applied, the DTT TX indicator should light on the 93B DISPLAY
module in the transmitting RFL 9300. The DTT RX and DTT 1 indicators should light on
the 93B DISPLAY module at the receiving RFL 9300.
3. Disconnect the dc voltage source from the DTT-IN terminals at the transmitting RFL 9300.
When the voltage is removed, the DTT TX indicator on the 93B DISPLAY module in the
transmitting RFL 9300 will remain lit until its RESET switch is pressed.
At the receiving RFL 9300, the output relay will remain latched until the initiating volt-
age is removed at the transmitting RFL 9300, and the DTT-1 trip current is externally in-
terrupted. The indicators at the receiving RFL 9300 will remain lit until the relay is un-
latched and the RESET switch is pressed.
4. Watch the display on the receiving RFL 9300.
If the current through the trip contacts is not interrupted within 500 ms, the message
"ALARM 24" will appear on the display. This means that the lockout relay (Device 86) is
defective.
5. Repeat steps 2 through 4 with the trip contacts unloaded.
The DTT 1 indicator at the receiving RFL 9300 will not light, because no trip current was
sensed. The DTT tripping relay will remain energized as long as the initiating voltage is
applied at the transmitting RFL 9300; this can be verified with an ohmmeter.
This test may be repeated in the other direction. The test also may be repeated with 0.2 Adc loading on the
DTT-2 trip circuit (terminals TB2-3 and TB2-4).
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