GAI-Tronics 12599-001 User Manual

Pub. 42004-375A

GAI-TRONICS® CORPORATION

A HUBBELL COMPANY

Model 12599-001

Hot Standby Amplifier Mo dule

Confidentiality Notice

This manua l is provide d sole ly as an operatio nal, installation, and ma inte nance guide and conta ins
sensitive business and t e chnical informatio n tha t is confidentia l and pr opri et ary to GAI- Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manu al may not be dis clos e d in any form, in whole or in pa rt, direct ly or i ndir ectly, to a ny
third pa r ty.

General Information

The Model 12599-001 Hot Standby Amplifier Module is designed for use in system cabinets equipped
with central power amplif iers requiring hot ( aut o matic) switchin g of a standby ( backu p) a mplifier wh e n
any one of the pr imary power amplifiers fail.

This module provides prioritized switching for either six single channel power amplifiers, or three dual­channel amplifiers with up to 720 watts of output power per channel. Also, multiple modules can be
cascaded using an in/out board control feature.

Figure 1. Model 12599-001 Hot Standby Amplifier Module

(Switches shown in factory default position)

GAI-Tronics Corporation P.O. Box 1060, Readi ng, PA 19607-1060 USA

610-777-1374  800-492-1212  Fax: [phone]

ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS

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Hardware Configuration

The Model 12599-001 Hot Standby Amplifier Module is a printed circuit board assembly (PCBA)
equipped with plug-in type terminal blocks, six high current relays for switching amplifier outputs, and 12
low-power relays for switching amplifier inputs and providing dry contact status outputs.

The module is also equipped with five slide switches for mode select functions, and six LEDs to indicate
actively switched circuits. The fault detection inputs are comprised of a Quad Comparator and Darlington
Arr ay for opera ting the re lay switching circuits.

Installation

The Model 12599-001 Hot Standby Amplifier Module is designed for mounting on 4-inch Snap Trak®
and measures 12 H× 4 W × 1.5 L inches (305 × 102 × 31.75 mm).

When installing or replacing this module, be sure to disconnect power for safety. When inserting the
module in SnapTrak
to the module’s printed circuit board and/or components. Once installed in the SnapTrak

®

, exer cise ca re when p ressing the m odule edg es in to the SnapT rak® to avoid damage

®

, be sure the
module edges are secured in the channels so that the module does not dislodge during transport or
oper atio n if subjected to v ibra tion. Also, if this modul e is used w ith other (cascaded) modu les, a one-inch
(25.4-mm) spacing between modules will facilitate wiring at the edge mounted terminal blocks.

Terminations

The Model 12599-001 Hot Standby Amplifier Module is equipped with modular (plug-in type) terminal
blocks. T hese modular termina l bloc ks simplify external wire connections duri ng inst allati on, an d
provide quick disco n nect if replaceme nt is ever r e quire d.

The following is a breakdown of each terminal block and its function(s):

TB1 – is the 12 V dc power input to the module.
TB2 – is a 12 V dc power output to anoth er (cascaded) modu le or anoth er 12 V dc pow ered d e vice.
TB3 – is where the Amp-1 through Amp-6 fault inputs connect. The OUT ter mi nal is dc common an d

connects to the input side of the amplifier’s internal fault circuit. The RET terminal connects to the
output of the amplifier’s internal fault circuit. Refer to Figure 2.

TB4, TB7, TB 10, TB13, TB16 and TB19 – are dry output contacts for Amp-1 through Amp-6 faults
respectively. Each contact set is a form “C” type. The maximum switching capacity for each contact set
is 24 V dc @ 1 amp and can be used for triggering a remote status indicator or an input at a supervised
system device for visual text display.

TB5, TB8, TB 11, TB14, TB17 and TB20 – are the audio source and input connections for Amp-1
through Amp-6. The SRC (sourc e) t ermina l s a re where the a mpl i fi er’s a udio source is con necte d . The
IN (input) terminals are where the amplifier’s input is connected. Be sure to observe polarity markings at
these termina l s for proper opera tion a nd aud io performance. Refer t o Figur e 3.

TB6, TB9, TB 12, TB15, TB18 and TB21 – are the audi o outpu t and s peaker line connections for
Amp-1 through Amp-6. The OUT (output) terminal is the where the active amplifier output (e.g., 4-ohm,
8-ohm, 16-ohm, 25 V, 70 V or 100 V) is connected. The SPKR (speak er) terminals are wh ere the
designated speaker(s) or speaker line connects to the module. Be sure to observe polarity markings at
these termina l s for proper opera tion a nd aud io performance. Refer t o Figur e 4.

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TB22 – is where the standby amplifier input connects if using a single channel amplifier. If using a dual-

channel amplifier, connect the channel 1 input to these terminals. See Note 1 and Figure 5 and Figure 6.

TB23

– is for busing the standby amplifier input to another (cascaded) module when using a single

channel amplifier. However, if a dual-channel amplifier is used with the module, the channel 2 input of
the standby amplifier should connect to these terminals. See Note 2 and Figure 5 and Figure 6.

TB24 – is where the standby amplifier output connects if using a single channel amplifier. If using a
dual-channel amplifier connect the channel 1 output to these terminals. See Note 2 and Figure 5 and
Figure 6.

TB25 – is for busing the standby amplifier input to another (cascaded) module when using a single
channel amplifier. However, if a dual channel amplifier is used with the module, then the channel 2
outp ut of the st andb y ampl ifier shou ld co nnect to these t erminals. See Note 3 and Figu re 5 and Figur e 6 .

TB26 – is the B

RD CNTL (Board C ontr ol) IN (input) and OUT (output), which is used if/when cascading

multiple modules. In a cascade arrangement, no connection is made at the IN terminal at the first module.
For the second module in the cascade, connect the OUT terminal of the first module to IN terminal of the
second module, and continue this wiring scheme across subsequent modules in the cascade. See Note 4
bel ow an d refer to F igur e 5 and F i gur e 6 .

OTES:

N

1. A jumper must be installed across the all unused OUT and RET input terminals at TB3 to prevent

false activation of unused circuits.

2. To use both inputs of a dual-channel standby amplifier across multiple (cascaded) modules, wire

TB22 and TB23 in parallel (respectively) across all modules.

3. To use both outputs of a dual-channel standby amplifier across multiple (cascaded) modules, wire

TB24 and TB25 in parallel (respectively) across all modules.

4. Most central amplifier system applications usually employ or specify a ratio of one standby amplifier

for every five or six primary amplifiers to minimize the risk of lost coverage. Be sure to check the
specified system requirements for the ratio of standby (backup) amplifiers to primary amplifiers.

Figure 2. Typical fault input connection

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Figure 3. Input Connections

Figure 4. Output Connections

Figure 5. Cascaded modules operated in single channel mode

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