Siemens Industry, Inc.
90
The second alert is the Tap Track Err. When viewing this alert, press the left arrow key
repeatedly. On the right side of the screen two character error codes will appear. There could
be between one and four of these codes. Note that the codes could have been generated all at
once or at any time since the alert was last cleared. The codes are:
UX
/* Tap Change Unexpected */
RS
/* Unexpected Neutral, Resync */
TT
/* Tap Track Errors, generic error */
OD
/* Tap Change Over Due */
For 3.07 and up:
UX
: occurs if algorithm can't tell direction tap change occurred or if operation count increases
without calling for a raise or lower
RS
: occurs when neutral signal is
on
and tap pos is
not
neutral; panel resets tap position to
neutral if Tap Resync is turned on
TT
: occurs if Tap Resync is on and bad neutral signal and tap position combo persists for more
than 10 seconds
OD
: occurs if "tap_chg_ctr" goes down to zero. tap_chg_ctr = R/L TapChgT/O
For 3.06*** (and probably earlier versions):
UX
: occurs if op count increments without a raise or lower signal sent (**)
RS
: occurs when neutral signal present and tap pos is not neutral; panel resets tap position to
neutral
TT
: occurs if can't tell tap change direction w/ algorithm (**) or if it times out while going from/to
neutral without sensing tap change (i.e., operation counter doesn’t increase) (**) or if bad
neutral signal and tap position combo persists
OD
: occurs if "tap_change_timeout_counter" reaches zero; e.g., op count switch does not
toggle within this many seconds after a raise/lower command. (20 sec for Siemens; 12 sec for
GE/Coop SD; 2 sec for LTC/Coop DD; 0.5 sec for LTC 0.5)
***will lose tap pos if bad neutral signal, tap pos in memory combo lasts > XX sec or as noted
above by (**)
