Pub. 42004-783L2C
SP2 Remote Subset/Speaker Amplifier Station
Page 9 of 20
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-783L2C.docx
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RTU Inputs
The standard Termination PCBA contains two auxiliary RTU inputs. The optional 70V/100V termination
board provides for speaker line monitoring and is equipped with just one auxiliary RTU input. These
inputs are terminated at terminal block
TB2
(see Figure 4).
1.
Pull the RTU Input cable(s) into the enclosure.
2.
Connect spade lugs to the wires.
3.
Install the RTU Input wires to terminal block
TB2
(see Table 3 or Table 4).
4.
Torque the terminal block screws to 8–10 in·lb (0.90–1.13 N·m).
5.
Install end-of-line resistors as shown to enable RTU input-cable monitoring (see Figure 7):
Table 3. Standard Termination Board
RTU Input Termination—TB2
Table 4. 70V/100V Termination Board
Speaker Line Monitoring and RTU Input
Termination—TB2
Pin Label
Function
Pin Label
Function
TB2-1
+
RTU
1
INPUT
RTU Input 1 +
TB2-1
+
LINE
SPRVN
70 V/100 V
Super
TB2-2
−
RTU Input 1 −
TB2-2
−
70 V/100 V
Supervision −
TB2-3
+
RTU
2
INPUT
RTU Input 2 +
TB2-3
+
RTU
INPUT
RTU Input +
TB2-4
−
RTU Input 2 −
TB2-4
−
RTU Input −
Figure 7. RTU Input Wiring Configurations for Cable Monitoring