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Operation | 6
SECTION 3: OPERATION
DEFINITIONS
ACTIVE ALARMS
An active alarm is a Redundant Amplifier Unit (RAU) generated fault, which indicates that the unit is presently detecting a
fault.
The active alarms that can be reported are:
An amplifier alarm is active while the current drawn by the amplifier exceeds the current limits programmed into the
unit for that amplifier. From the factory, the current limits are set at ±20% of the nominal current draw at ambient.
A power supply alarm is active when a power supply exceeds ±8% of the nominal voltage rating at ambient
temperature. Power supply A and power supply B both have a 5.5V and a 24.5V supply; for the 5.5V source, the
range is 5 to 6V, and for the 24.5V source, the range is 22.5V to 26.5V
A switch alarm is active if a switch is detected in a position other than what was expected. Switch alarms are
suppressed during switch operations.
AMPLIFIER CURRENT LIMITS
Current limits vary from amplifier to amplifier. Amplifier Current Limits are set at the factory. It is recommended that an
operator change Amplifier Current Limits only when an amplifier is being replaced in the field.
PRIMARY AMPLIFIER
A Primary Amplifier is intended to remain On-Line during normal operation. If a Primary Amplifier fails and the backup
amplifier is available, the Primary Amplifier will be switched into Standby and the Backup Amplifier will be switched On-Line
in its place.
In a 1:1 configuration Amplifier A1 is the Primary Amplifier.
In a Dual 1:1 configuration Amplifiers A1 and A3 are the Primary Amplifiers
In a 1:2 configuration Amplifiers A1 and A2 are the Primary Amplifiers.
BACKUP AMPLIFIER
A Backup Amplifier is intended to remain in Standby during normal operation. In the event a of a Primary Amplifier fault the
Backup Amplifier will be switched On-Line and the Primary Amplifier will be switched into Standby.
In a 1:1 configuration Amplifier A2 is the Backup Amplifier.
In a Dual 1:1 configuration Amplifiers A2 and A4 are the Backup Amplifiers
In a 1:2 configuration Amplifier A3 is the Backup Amplifier.
ERROR TONE
A beep lasting for one second, indicating an invalid key press or a screen timeout.
ON-LINE
An amplifier is considered On-Line if it is switched into an input/output signal path.
STANDBY
An amplifier is considered in Standby if it is not switched into an input/output signal path.
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