26 S&C Instruction Sheet 461-502
Operation
It is important to keep in mind the following:
• When the LMO feature is enabled, a new LCD screen
titled “LMO” will be automatically displayed under the
LCD scrolling screen sequence as its rst scrolling
screen, with the X value shown on the left and the Y
value shown on the right. This screen is not displayed
when the LMO feature is disabled.
• The mode selector operation counter registers a single
movement starting either in the Up or Down position
of the lever as an operation. Moving the lever down and
then back up is counted as two operations.
• If the operation time window (Y) expires before X lever
operations are completed, the command sequence is
terminated. The operation counter will reset to zero;
any additional lever operations will begin the count
toward a new command sequence.
• If the TripSaver II recloser detects a fault while a user is
performing the LMO command, the command sequence
will reset before the recloser trips, and the protection
sequence of the TripSaver II recloser will operate as
normal. The Reclose/Non-Reclose function will be
selected based on the operating lever position at the
time the TripSaver II recloser trips. Figures 36 through
39 show how new LCD screens appear.
• LMO events will be recorded in the Event log.
• When there is not enough charge in the TripSaver II
recloser’s capacitor to trip the vacuum interrupter, the
LCD screen will display an “LMO Aborted” message
which will stay on for 3 minutes after the LMO attempt.
When the LMO feature is disabled, the TripSaver II
recloser will not drop open, no matter how many times
the MODE-SELECTOR lever is operated. However, if 10
MODE-SELECTOR lever operations are detected within
a 60-second timeframe when the mode is disabled and
the recloser is in the vertical position, the recloser will
display a screen showing “LMO XXXXX” to remind the line
crew the LMO feature is disabled (see Figure 40). At the
same time, to maximize system security, the recloser will
consider that as a suspicious attempt, and if the TripSaver
II recloser is connected to remote communications, the
recloser will send an unsolicited alert. This activity will
also be recorded in the Event log.
Figure 36. Screen showing LMO is enabled, with the operations
count and time window.
Figure 37. Prompt screen for LMO cancellation.
Figure 38. Confirmation screen that LMO has been cancelled.
Figure 39. Walk Away screen.
Figure 40. Suspicious Attempt screen.
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