GAI-Tronics 12593-101 Redundant PPI Switching Module - Manual (Page 4)

Pub. 42004-474A
Model 12593-101 Redundant PPI Switching Module Page 4 of 5
f:\standard ioms - current release\42004 instr. manuals\42004-474a.doc
04/13
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 control
care or primary AMI fault occurs in the system. The signals being switched are the page line, party line
1, party line 2 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
Connecting the Control Input (TB2) to dc ground will energize all relays on the module. LED1 (A-
Active) will illuminate to indicate the Primary system is active. The SmartSeries Page/Party
® stations
(J3) are connected to the Primary PPI card (J1) via relays K3-K6.
The module’s CPU PCBA, is connected to the page line of the Secondary PPI card (J2) via relay K2. 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
The dc ground is removed from TB2 during a fault condition. LED2 (B-Active) will illuminate to
indicate the Secondary system is active. Relays K1–K7 are de-energized. Relay K1 contacts are wired to
TB3 and will change state for the duration of the fault 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 (J1).
Maintenance
If the module requires service, contact your Regional Service Center for a return authorization number
(RA#). The module should be shipped prepaid to GAI-Tronics with a return authorization number and a
purchase order number. If the module is under warranty, repairs or a replacement will be made in
accordance with GAI-Tronics’ warranty policy. Please include a written explanation of all defects to
assist our technicians in their troubleshooting efforts.
Call 800-492-1212 inside the USA or 610-777-1374 outside the USA for help identifying the Regional
Service Center closest to you.