GAI-Tronics 12594-101 Redundant AZI Switching Module - Manual (Page 4)

Pub. 42004-475A
Model 12594-101 Redundant AZI Switching Module Page 4 of 5
f:\standard ioms - current release\42004 instr. manuals\42004-475a.doc
04/13
TB5 – Pri. RS-485 Data and
Audio Output #6 TB6 – Sec. RS-485 Data and
Audio Output #6
Terminal No. Function Terminal No. Function
1 Audio Line 6 (−) 1 Audio Line 6 (−)
2 Audio Line 6 (+) 2 Audio Line 6 (+)
3 RS-485 data (−) 3 RS-485 data (−)
4 RS-485 data (+) 4 RS-485 data (+)
Operation
The module has essentially two modes of operation, normal and fault. Each mode is described in detail
below.
TB5 and TB6 are not affected by the module’s switching action. They are simply pass-through terminals
for the RS-485 data lines and audio line #6 from the AZI cards. TB5 connects to the Primary AZI card
(J2) and TB6 connects to the Secondary AZI card (J4).
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 Primary AZI card’s audio (J1 & J2)
is connected to the audio output terminals (TB4). The Secondary AZI card’s audio (J3 & J4) is
disconnected from the audio output terminals (TB4).
Fault Condition
The dc ground is removed from TB2 during a fault condition. LED2 (B-Active) illuminates to indicate
the Secondary system is active. All of the relays are de-energized. Relay K1 contacts are wired to TB3
and will change state for the duration of the fault condition. Relays K2–K7 switch the Secondary AZI
card’s audio (J3 & J4) to the audio output terminals (TB4). The Primary AZI card’s audio (J1 & J2) is
disconnected from the audio output terminals (TB4).
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.