GAI-Tronics 12599-002 Hot Standby Amplifier Module - Manual (Page 4)

Pub. 42004-412A
Model 12599-002 Hot Standby Amplifier Module Page: 4 of 17
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TB4, TB7, TB10, 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 for an input at a supervised
system device for a visual text display. See Note 5.
TB5, TB8, TB11, TB14, TB17 and TB20 – are the audio source and input connections for Amp-1
through Amp-6. The amplifier’s audio source is connected at the
SRC (source) terminals. The
amplifier’s input is connected at the IN (input) terminals. Be sure to observe polarity markings at these
terminals for proper operation and audio performance. Refer to Figure 5.
TB6, TB9, TB12, TB15, TB18 and TB21 – are the audio output and speaker line connections for
Amp-1 through Amp-6. The active amplifier output (e.g., 4-ohm, 8-ohm, 16-ohm, 25 V, 70 V or 100 V)
is connected at the
OUT (output) terminal. The designated speaker(s) or speaker line connects to the
module at the SPKR (speaker) terminals. Be sure to observe polarity markings at these terminals for
proper operation and audio performance. Refer to Figure 6.
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 2 and refer to Figure 7 and
Figure 8.
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 refer to Figure 7 and Figure 8.
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 refer to Figure 7
and Figure 8.
TB25 – is for busing the standby amplifier output 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
output of the standby amplifier should connect to these terminals. See Note 3 and refer to Figure 7 and
Figure 8.
TB26 – is the B RD C NTL (board control) IN (input) and OUT (output), which is used in a cascade
arrangement of 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 and refer to Figure 7 and Figure 8.
N OTES :
1. When the module is operated in 2-channel (dual-channel) mode, the Amp-4, Amp-5 and Amp-6 fault
inputs are not used, and a jumper must be wired across each unused input terminal set at TB3. Also,
the respective input jumper clips must be set to the dry position to prevent false activation of unused
fault input 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.
5. When the module is operated in 2-channel (dual-channel) mode, the Amp-4, Amp-5 and Amp-6 fault
output contact are not used at TB13, TB16 and TB19 respectively.