1:2 Automatic mode without Priority:  Auto led lit. No Priority leds lit.

Operations in a 1:2 mode.

No manual switch commands will be accepted by the controller while in automatic mode.

Priority commands are permitted.

IMPORTANT

A FLASHING Auto led signifies that the controller cannot function in automatic.  This could be due to:

            a) Switches not being connected, (more specifically, not reporting a position.)

            b) The highest level of priority has been met.

            c) The standby amplifier has a fault condition.

Amplifier B is always considered the backup amplifier.

No priority leds are lit when in Automatic.

1:2 Operation without Priority:

To enter this mode, both waveguide switches must be in position 1.  That means that both amplifier A and amplifier C are online, with amplifier B working into a load.

In the event of a failure on amplifier A, the controller will switch S1 and S2 to position 2.  This will place amplifier B online and terminate amplifier A.  At this point, the automatic led will flash, indicating that no further action with be taken in automatic mode.

In the event of a failure on amplifier C, the controller will switch S3 and S4 to position 2.  This will place amplifier B online and terminate amplifier C.  At this point, the automatic led will flash, indicating that no further action with be taken in automatic mode.

In the event of a failure on amplifier B (the back up amplifier), the controller will do no switching.  At this point, the automatic led will flash, indicating that no further action with be taken in automatic mode. 

1:2 Automatic mode with Priority:  Auto led lit.  Priority led lit.

Operations in a 1:2 mode.

While in automatic, if an amplifier has priority, the priority associated with that amplifier will be lit.  Note that the back up amplifier cannot have priority.

While in automatic mode with priority, everything from the previous section applies to the operation of automatic mode.

Here’s the difference.

If a faulted amplifier is backed up, and it is not the priority amplifier, the controller continues to function in automatic.  Should the priority amplifier fail, amplifier B changes the switches in order to backup the priority amplifier.  When the priority amplifier has been placed online, then automatic has reached then end of its cycle.

Example of automatic with priority on C:

Amplifier C has priority.

All switches are in position 1.

No faults exist.

Amplifier A fails…..S1, and S2 go to position 2…..placing amplifier B online.

Should Amplifier C fail, Then

Amplifier C fails,,,,,,S1 and S2 go to position 1, S3 and S4 go to position 2…..placing amplifier B online backing up amplifier C.

Example of automatic with priority on A:

Amplifier A has priority.

All switches are in position 1.

No faults exist.

Amplifier C fails…..S3, and S4 go to position 2…..placing amplifier B online.

Should Amplifier A fail, Then

Amplifier A fails,,,,,,S1 and S2 go to position 2, S3 and S4 go to position 1…..placing amplifier B online backing up amplifier A.

1:1 Automatic mode:  Auto led lit.  Both priority leds lit.

For 1:1 mode operations.

No manual switch commands will be accepted by the controller while in automatic mode.

Priority commands are not permitted.

IMPORTANT

A FLASHING Auto led signifies that the controller cannot function in automatic.  This could be due to:

a) Wave guide Switches not  connected, (more specifically, not reporting a position.)

            b) The standby amplifier has a fault condition. 

The DNL-5 controller can be used as a 1:1 controller by setting dip switch S4-1 to the “ON” position.  With this setting, only the positions of S1 and S2, along with the fault status of amplifier A and amplifier B are displayed on the front panel.  Also illuminated are BOTH priority leds.

Both priority leds being lit simply signifies that the controller is in a 1:1 mode.  There is no “priority” in the 1:1 mode per se.

The automatic operation of the DNL-5 while in the 1:1 mode is as follows:

The online amplifier (amplifier transmitting out) will be backed up by the amplifier that is being terminated.  The controller will remain in automatic mode (no blinking automatic led) as long as both amplifier are in a no fault condition.

If a failed amplifier gets backed up by the “other” amplifier, and then later recovers, it then becomes the backup amplifier and automatic resumes (automatically).