Qualitrol 509ITM Series, Manual

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You can bank switch more than two relays in a loop, but this can only be accomplished if the
bank switching loop is closed or completed after the setup. This means that the last relay of
the bank switching loop must select the first relay of the loop.
Example: If Relay 2
selects “Relay 4”, and
Relay 4
selects “Relay 6”, you must set up
Relay 6
to select “Relay 2”.
The bank switching is accomplished by exchanging all the matrix controls of the selected
relay with the one selecting it. This occurs at midnight each night so if you were to view the
relay settings on any two consecutive days, you would notice the changes.
Important:
Relays that are assigned to alarm with the 509ITM-200 Cooling Monitor
feature or the 509ITM-300 Load Tap Changer Monitor feature should not be
used in bank switching.