Specifications

48 209351 REV B Operations Manual, Redundant System Controllers
4.2.2 SSPA 1:2 Redundant System Operation
The RCP2-1200 can be configured to accept external fault inputs at connector J8 (See
Section 2.4.6). The external alarm inputs operate with a closure to ground input. The
alarm inputs are opto-isolated inputs that expose +5 VDC, open circuit voltage, at
5 mA maximum short circuit current. The external alarm inputs can be driven by an
appropriate open collector device or relay contacts. Redundant systems typically use a
form C relay summary alarm output to drive the RCP2 external alarm input. A typical
block diagram representation of such a system is shown in Figure 4-8.
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 RCP2-1200 they must first be enabled from
the front panel using the following procedure.
4.2.2.1 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.
Figure 4-8: Block Diagram, 1:2 SSPA Redundant System