Amphenol Procom PRO-DAR4 Podręcznik użytkownika - Strona 9
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Alarm system
The RF amplifier system is provided with an alarm function, which monitors the DC
voltage/current of the 2 RF amplifier stages in the redundant amplifier system.
The functional status is given by means of 2 different indications:
1. The POWER LED on the front plate, which will light constantly with green light,
if the amplifier condition is OK. If a fault occurs in the RF amplifier system, the LED will
light with flashing red light.
2. A floating relay switch-over contact, which is connected to the alarm connector on the
rear side of the multicoupler.
This relay contact has a defined position if the condition of the 2 amplifier stages is OK.
If a fault occurs, the relay contact will switch over to the opposite position, thus indicating
a failure condition.
The position of the relay contact can be remotely read via the alarm connector.
Alarm relay normal condition
In normal condition, the C (Common) and the NC (Normally Closed) terminals are
connected.
In failure condition, the C (Common) and the NO (Normally Open) terminals are connected.
The relay contact is floating, that is, the contact, the wiring and the alarm connector are
electrically isolated from ground and the remaining circuitry.
The relay contact is rated to 60 V and 2 A DC.
6.3
Preselector (option)
If the receiver multicoupler shall operate within a narrower specified frequency band, it will
be advantageous to insert a preselector filter with pass range equal to the frequency band of
interest between the multicoupler ANT input and the RF amplifier.
The preselector filter will allow the wanted frequency band to pass and simultaneously
attenuate all signals outside this band, thus reducing the risk of possible interference from
strong unwanted out-of-band signals.
If desired, the PRO-DAR models can be ordered with a costumer selected factory built-in
preselector filter. Amphenol Procom offers a large number of standard low-loss filters, which
are suitable as multicoupler preselector.
An overview of available filters suitable for preselector is found on the PRO-DAR datasheet
on
www.amphenolprocom.dk
Alarm relay failure condition
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