DEVICE DESCRIPTIONS
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PROMATRIX System User Handbook 1.2
5.6.5 INITIAL OPERATION OF A SPARE AMP SYSTEM
A single DCS 421R control module can control up to 17 different DCS 422R and/or DCS 423R modules. In that
case, interconnecting two DCS 400 base units by the use of DCS 405R extension modules is necessary.
When configuring a spare system, first you have to decide how many DCS 422R and DCS 423R modules are
going to be needed. Now, insert the required modules into the slots next to the DCS 421R. Start at slot 2 with all
DCS 423R modules and next with all DCS 422R modules to make sure that 100V-signals (70V/50V) and LF-
signals are separated. The DCS 421R constantly monitors all installed modules for operational readiness.
Therefore, storing a hardware-configuration as reference in the DCS 421R control module once is necessary. The
reference teach-in is done by pressing the pushbutton on the rear panel of the DCS421 module for at least 3
seconds, until the red LED stops blinking. The flashing of the red LED indicates, that there was or still is a
difference between the learned reference and the actually sensed card configuration. Such deviation between
actual and target configuration is kept in memory until resetting the device by briefly pressing the pushbutton. The
DCS 421R control module always operates on the basis of the taught-in reference configuration – instead of the
currently sensed, actual configuration!
The DCS 421R allocates and enumerates all available DCS 422R / 423R modules in the same order in which
they appear in the rack. In other words, DCS 423R modules are registered in that order, which they are
recognized in, regardless of their position in the rack and independent from the amount of DCS 422R modules
installed.
Depending on the setting of the DIP-switches and the number of modules, up to eight independently operating
spare systems are being generated. In addition to the DCS 400 rack frame and the DCS 412R control module a
single spare system consists of at least one DCS 423R module or of up to a maximum amount of 17 DCS 423R
or DCS 422R modules. Each independent spare system allocates sequentially as many DCS 422R / DCS 423R
modules as needed, in the order of their enumeration.
Notes:
Please, bear in mind that each logic spare system has to include at least one DCS 423R module (additional to
DCS 400 and DCS 412R). The size of a single spare system can only be expanded by a complete DCS 423R
module, which in turn monitors up to four amplifier outputs and, in case of failure, switches the affected output
over to a spare amp. If less than four monitor channels of a DCS 423R module are needed, disabling the pilot
tone examination circuits for the unused channels is mandatory. This is accomplished by removing the internal
jumpers JP11 - JP15 on the printed board assembly, so that the pilot tone recognition for all circuits that are not in
use is set to “OK”.
A spare system is only ready for operation when all referenced DCS 422R / 423R modules are fully functional.
The entire system is not functional if one module fails to operate properly. If one spare system has been switched
off because of hardware limitations, all subsequent spare systems up to the eighth system are also not
operational.
Summary of Contents for PROMATRIX System
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