GAI-Tronics 12599-001 Hot Standby Amplifier Module - Manual (Page 9)

Pub. 42004-375A
Model 12599-001 Hot Standby Amplifier Module Page: 9 of 11
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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 12599-001 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.
S4 Input Bus – This switch allows the input signal bus to function across all six relay circuits for six
single-channel amplifiers, or be split for three dual-channel amplifiers. Thus, if switches S2 and S3 are
set to either 1CH or 2CH, this switch must also be set to the same operating mode. See the note below.
S5 Output Bus – This switch allows the output signal bus to function across all six relay circuits for six
single channel amplifiers, or be split for three dual-channel amplifiers. Thus, if switches S2, S3 and S4
are set to either 1CH or 2CH, this switch must also be set to the same operating mode. See the note
below.
NOTE
Switches S2, S3, S4 and S5 must be set to the same operating position. Do NOT operate any of the
switches in opposite positions as this will result in improper operation of this module.