GAI-Tronics 12599-002 Hot Standby Amplifier Module - Manual (Page 14)

Pub. 42004-412A
Model 12599-002 Hot Standby Amplifier Module Page: 14 of 17
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While it is difficult to determine which area of a facility is the most critical (as in item 2 above), an
example would be an offshore oil platform system with multiple amplifiers. In this case, the living
quarters (LQ) are usually considered such an area. In this type of system/cabinet design, the LQ amplifier
should be connected to the Amp-1 terminals to ensure that personnel (sleeping in the LQ) will be alerted
during emergencies.
Dry Contact Outputs
The Model 12599-002 Hot Standby Amplifier Module provides six, Form “C” dry contact outputs (one
per amplifier circuit) that can be used for triggering either a remote status indicator, or an input at a
supervised system device for visual text display. Each output contact operates in conjunction with its
respective fault detection circuit so that the status of all connected amplifiers can be monitored at all
times, regardless of their priority assignment.
Cascading Modules
The Model 12599-002 Hot Standby Amplifier Module can be operated with a series of other modules in a
cascade. This feature is useful in cabinet/system applications when the following criteria must be met:
• A higher ratio of primary (active) amplifiers to a standby amplifier is needed, or
• In particular, when dual-channel amplifiers are employed.
When using the cascade feature, the IN/OUT control at TB26 must be used between modules. For the
cascade to function properly, connect the OUT terminal of the first module to the IN terminal at the
second module. Do not make any connections to the IN terminal at the first module. For subsequent
modules in the cascade, this in/out wiring arrangement must continue across all modules.
In addition to in/out control across modules, the mode switches S1 through S5 must also be set to the
proper operating position. See the Mode Switches (S1–S5) section below for information on the function
and settings of these switches.
Mode Switches (S1–S5)
The Model 12599-002 Hot Standby Amplifier Module is equipped with five mode control switches. The
function of each is switch is described below:
S1 Brd Cntl (Board control) – Since relay switching on this module is prioritized, this switch determines
if the module is operated as standalone, the first of multiple modules, or is operating behind another
module. If the module is used standalone, or is the first of multiple modules, the switch must be set to the
1
ST position. However, if the module operates behind another module in a cascaded control path, the
switch must be set to the 2 ND + position.
S2/S3 Sw’g Cntl (Switching control) – Since this module is designed to switch either six single-channel
amplifiers or three dual-channel amplifiers, these two switches must be set to the appropriate position for
the type of amplifier being switched, e.g.,
1CH (1-channel) or 2CH (2-channel) respectively. (See the
note below.)
When the switches are set to the 1CH position, all six relay circuit groups operate independently via
control from their respective fault input circuits. When the switches are set to the 2CH position, the
Amp-1/Amp-4 circuits, Amp-2/Amp-5 circuits, and Amp-3/Amp-6 circuits are linked for switching both
channels of the amplifier simultaneously.