Comtech EF Data RCU108 - Manual (Page 27)

RCU108 1:8 Protection Switch Operation
TM066 - Rev. 1
Page 3-5
Automatic Learning
Successfully Completed
This window indicates that the Backup Converter was successfully able to ‘Learn’ about the Primary
Converters.
Automatic Learning
Failed
This window indicates that the Backup Converter was not able to learn about the Prime Converter.
When the
No Response - The Prime Converter did not respond.
Invalid Response - The Prime Converter responded, but the Backup Converter did not
receive the message clearly.
Incompatible Converter - The Backup Converter is not capable of backing up the Prime
Converter.
RF is Turned Off - The Backup Converter will not ‘Learn’ and back up an upconverter that
has its RF turned off. Turn the RF ‘ON’ on the Prime Converter and repeat the ‘Learn’
process.
3.7 Switch Logic
The RCU108 uses the output of the Form-C relay in the converter to determine what action to take.
In the following descriptions, it is assumed that the switch is in Auto mode and that the other
converters are not faulted. (If the switch were in Manual mode, no switching would take place).
The Fault N.O logic level is derived from the normally open contact of the summary fault Form-C
relay in the converter. The converter, when clear of any and all faults, asserts the summary fault
relay to the not faulted state and the contact is open. A fault in the converter, turning the converter
off, failure of the converter power supply, or disconnecting the switch interface cable will cause the
relay to close. Upon detection of this event, the switch will toggle control and data to the backup
converter.
Once the fault in the faulted converter is cleared, the converter will reset the summary fault relay and
the contact will again be open. Upon detection of this event, the switch will place the converter in
standby, so that it can be placed online in the event that another converter fails. The switch will not
automatically switch back to the original online converter.
3.8 Troubleshooting and/or Replacing a Faulted Converter
Prior to testing or replacing a faulted converter it is strongly recommended that the mode selection
switch be set to manually backup the faulted converter. Once the faults on the faulted converter have
been cleared (or the converter has been replaced), the switch can be placed in the Auto Mode by
pressing the SET button once. (The backup will remain online and the prime will be in standby. There
will be no interruption in traffic).
To put the Prime online and the Backup in Standby, press the SET button twice and the Switch will