R
R
M
M
A
A
S
S
-
-
1
1
2
2
0
0
A
A
l
l
a
a
r
r
m
m
28
Chapter 3
Installation Instructions
Table 3.E
Standard Transmitter Uncommitted Input Position Numbers
Position
Number
Input
Description
Charge
Position
Number
Input
Description
Charge
21
ANL IN
-
13
UC 4 Input
20
ANL IN
+
12
UC 4 Input
+
19
UC 7 Input
-
11
UC 3 Input
18
UC 7 Input
+
10
UC 3 Input
+
17
UC 6 Input
-
9
UC 2 Input
16
UC 6 Input
+
8
UC 2 Input
+
15
UC 5 Input
7
UC 1 Input
14
UC 5 Input
+
6
UC 1 Input
+
3.3.5 Waveguide Pressure Switch (Optional)
The optional Waveguide Pressure Switch Assembly (part number 034-0004-01)
is used to monitor an air or nitrogen gas supply used to pressurize antenna
feeder lines. (Antenna feeder lines are often pressurized to prevent condensation
on the inside of the line.) When properly installed, the switch will activate an
alarm in the RMAS-120 when the gas pressure from the pressure connection
decreases to within 1 psi (pounds per square inch) of the ambient air pressure.
This will alert supervisors that antenna feeders are no longer properly
pressurized
.
The wiring for the switch assembly is configured as a Form C Relay, with wire
colors as follows:
Red = Normally Closed (not used)
Brown = Center
Blue = Normally Open
Alternatively, if the gas distribution manifold includes a low pressure switch, that
switch’s contacts can be connected to the WG alarm input points.
Closure = WG Low Pressure Alarm.
To install the Pressure Switch Assembly:
1. Locate the Pressure Switch assembly.
2. Using a flat-bladed screwdriver, unscrew the two screws on the cover of the
conduit box.
3. Thread the three wires from the inside of the box out through the open wiring
hole.
4. Replace the conduit box cover and tighten the two screws.
5. Connect two wires to the Waveguide IN + and Waveguide IN - positions on
TB1 of the Transmitter Assembly
—
see Figure 3.4
.