GAI-Tronics 12593-001 Redundant PPI Switching Module - Manual (Page 4)

Pub. 42004-411A
Model 12593-001 Redundant PPI Switching Module Page: 4 of 6
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-411a.doc
05/08
Address Switch Settings
Address switches S1 and S2 on the upper CPU PCBA must each be set to position F for a board address
of FF. When using multiple modules, address FF must be set on ALL modules. Address FF allows the
module to operate as a Multi-Station Simulator (MSS), with its designated PPI cards. Refer to the
operation section for information on the MSS feature.
Operation
The module switches the SmartSeries Page/Party
®
Stations between the Page/Party
®
Interface (PPI) cards
in the primary and secondary card racks. The switching action is initiated whenever a primary MCU or
primary AMI fault occurs in the system. The signals being switched are the page line, party lines 1 and 2,
the relay control output (RLY) and the control input (CLS).
The module has essentially two modes of operation, normal and fault. Each mode is described in detail
below.
Normal Condition
All relays on the module are de-energized. The SmartSeries Page/Party ® stations (J3) are connected to
the Primary PPI card (J1) via relays K2-K6.
The module’s CPU PCBA, is connected to the page line of the Secondary PPI card (P2) via relay K7.
The CPU PCBA simulates all the SmartSeries Page/Party
®
stations by responding to all station polling
requests from the Secondary Master Control Unit (MCU). This action prevents SmartSeries station faults
from occurring in the secondary system.
Fault Condition
A fault condition is signaled by connecting either terminal of JTB4 to dc ground. LED1 (Pri-Active) or
LED2 (Sec-Active) illuminate to indicate the active input. In an ADVANCE system application, these
inputs are active if a primary MCU or primary AMI fault occurs. The control signal input is supplied by
an external relay contact.
When activated, relays K1–K7 are energized. Relay K1 contacts are wired to JTB1 and will change state
for the duration of the active condition. Relays K2–K6 switch the SmartSeries Page/Party
® stations (J3)
to the Secondary PPI card (J2). The CPU PCBA, is connected to the page line of the Primary PPI card
(P1).