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7. Operations

Understanding the T-Bar and Transition LEDs

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This section describes the functionality of the T-Barand Transition LEDs, which are identical for the M/E and PGM banks.

Transition LEDs

T-Bar

Figure 7-11.T-Bar and Transition LEDs

The T-Barprovides manual transition control for the layers enabled in the Next Transition Group. For both manual and automatic transitions, the Transition LEDs indicate the position of the transition in progress.

The following topics are discussed in this section:

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Manual Transitions

Automatic Transitions

Physical and Virtual T-Bar Position

Transition LED Notes

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When a manual transition is performed, the T-Barcontrols the transition direction — away from (or back towards) the end-limit. Please note:

•In general, when the T-Baris resting at either the top or bottom limit and all Transition LEDs are off, the bank’s output is full BG (or PGM) bus, and the various key layers are completely on or off.

•From either limit (when BG is armed), moving the T-Baralways transitions from the BG (or PGM) bus towards the PST bus.

•When the T-Baris manually moved, the Transition LEDs always move in the same direction as T-Barmovement. The LEDs indicate the transition’s position between the BG (or PGM) and PST.

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This section provides information about automatic transitions, and their flexibility. Please note the following important points:

•When an automatic transition is performed, the Transition LEDs indicate the transition’s position, but the direction is always towards the PST bus.

•If the T-Baris at a limit, the Transition LEDs always move away from the T-Bar’s position — towards PST.

FSN Series • User’s Guide • Rev 01 325