Specifications

44 209351 REV B Operations Manual, Redundant System Controllers
4.1.2 SSPA 1:1 Redundant System Operation
The RCP2-1100 can be configured to accept external fault inputs at connector J8. The
external alarm inputs operate with a closure to ground input. The alarm inputs are opto
-isolated inputs, exposing +5 VDC (open circuit voltage) at 5 mA maximum short circuit
current. The external alarm inputs can be driven with an appropriate open collector
device or relay contacts. Solid state power amplifier redundant systems typically use a
form C relay summary alarm output to drive the RCP2 external alarm input. A
schematic representation of such a system is shown in Figure 4-4.
The external alarm inputs are not limited to SSPA systems. Any device with the
appropriate alarm output circuitry could be connected to the external alarm inputs.
To use the external alarm inputs on the RCP2-1100 they must first be enabled from
the front panel using the following procedure.
4.1.2.1 External Alarm Tracking
Press the Main Menu key; select 4.Flt. Setup and press the Enter key; select 1.Mjr.
Faults and press the Enter key; select 2.External and press the Enter key. This puts
the RCP2-1100 in external alarm monitor mode
&
CONTROL
MONITOR
A
B
C
1
2
4
3
RF Output
Transfer Switch
CONTROL CABLE
C N.C.N.O.
RCP2-1100
J8
J3
4
1
2
External Alarm
Cable
RF Input
F
D
Pos 1
Pos 2
U
W
P
S
&
CONTROL
MONITOR
Open on FaultClosed on Fault
SSPA 2
SSPA 1
Closed on Fault
Open on Fault
a
bL
Figure 4-4: Schematic, Typical 1:1 Redundant SSPA System