Pub. 42004-790B
SP2 Fiber Class I Div. 2 Handset/Speaker Amplifier Station
Page 10 of 24
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RTU Output
Two form C contacts are provided to power a beacon (see Figure 8). Terminate the output at terminal
block
TB2
(see Figure 4). Configure the output for dry contact use by removing jumpers
JU1
and
JU2
.
WARNING
—Line voltage is present at the NO contact until
JU1
and
JU2
are removed.
1.
Pull the RTU output cable into the enclosure.
2.
Install spade lugs on the wires.
3.
Connect the RTU output wires to terminal block
TB2
4.
Torque the terminal block screws to 8–10 in·lb (0.90–1.13 N·m).
For beacon cable monitoring:
5.
Install a 20-kilohm 10-watt resistor across the terminals of the beacon (see Figure 8).
6.
Install jumpers at terminal block
TB2
to enable cable monitoring (see Figure 8).
N
OTE
:
Using an RTU input to monitor the beacon wiring makes it unavailable for other functions.
Table 5. RTU Output Contacts—TB2
Pin Label
Description
TB2-5
NC
A
Normally Closed Output A
TB2-6
NC
B
Normally Closed Output B
TB2-7
COM
A
Common Output A
TB2-8
COM
B
Common Output B
TB2-9
NO
A
Normally Open Output A
TB2-10
NO
B
Normally Open Output B
Figure 8. Supervised Output Wiring—TB2
